Package Description

Go to the download folder, you would find a file named “eclipse-java-mars-2-macosx-cocoa-x8664.tar” (the file name may be different based on the version you download but it should be a tar file starting with word eclipse). Operating System: Windows 7 or later, Mac OS 10.9 or later, or modern Linux. 64-bit support only for MyEclipse 2018 or later. Minimum: 5GB of free disk space with 1 GB of free RAM Recommended: 10 GB of free disk space with 2 GB of free RAM.

Tools for Java developers creating Java EE and Web applications, including a Java IDE, tools for Java EE, JPA, JSF, Mylyn and others.

This package includes:

• org.eclipse.cvs
• org.eclipse.help
• org.eclipse.jdt
• org.eclipse.platform
• org.eclipse.pde
• org.eclipse.mylyn.ide_feature
• org.eclipse.mylyn.java_feature
• org.eclipse.mylyn.bugzilla_feature
• org.eclipse.mylyn.context_feature
• org.eclipse.mylyn_feature
• org.eclipse.mylyn.wikitext_feature
• org.eclipse.rse
• org.eclipse.rse.useractions
• org.eclipse.tm.terminal
• org.eclipse.tm.terminal.ssh
• org.eclipse.tm.terminal.telnet
• org.eclipse.tm.terminal.view
• org.eclipse.datatools.modelbase.feature
• org.eclipse.datatools.connectivity.feature
• org.eclipse.datatools.sqldevtools.feature
• org.eclipse.datatools.intro
• org.eclipse.datatools.doc.user
• org.eclipse.datatools.common.doc.user
• org.eclipse.datatools.connectivity.doc.user
• org.eclipse.datatools.sqltools.doc.user
• org.eclipse.datatools.enablement.feature
• org.eclipse.wst.common.fproj
• org.eclipse.wst.jsdt.feature
• org.eclipse.wst.xml_ui.feature
• org.eclipse.wst.web_ui.feature
• org.eclipse.wst.server_adapters.feature
• org.eclipse.wst.xsl.feature
• org.eclipse.jst.common.fproj.enablement.jdt
• org.eclipse.jst.server_ui.feature
• org.eclipse.jst.server_adapters.feature
• org.eclipse.jst.server_adapters.ext.feature
• org.eclipse.jst.web_ui.feature
• org.eclipse.jst.enterprise_ui.feature
• org.eclipse.jst.webpageeditor.feature
• org.eclipse.jst.jsf.apache.trinidad.tagsupport.feature
• org.eclipse.jst.ws.axis2tools.feature
• org.eclipse.jst.ws.axis2tools.feature
• org.eclipse.jpt.common.feature
• org.eclipse.jpt.common.eclipselink.feature
• org.eclipse.jpt.dbws.eclipselink.feature
• org.eclipse.jpt.jaxb.eclipselink.feature
• org.eclipse.jpt.jaxb.feature
• org.eclipse.jpt.jpa.eclipselink.feature
• org.eclipse.jpt.jpa.feature
• org.eclipse.jsf.feature
• org.eclipse.jst.webpageeditor.feature
• org.eclipse.jst.jsf.apache.trinidad.tagsupport.feature
• org.eclipse.jst.ws.jaxws.feature
• org.eclipse.jst.ws.cxf.feature
• org.eclipse.jst.ws.jaxws.dom.feature
• org.eclipse.epp.package.common.feature

Maintained by: WTP and the Eclipse Packaging Project

Bugzilla

Bug ID	Title	Status
509189	Setup errors	NEW
507509	Adding new CFT feature to JEE package for Neon.2 and Oxygen	NEW
512008	Add Spring tooling	NEW
512880	Include SpotBugs in Java and Java EE package	NEW
513864	Something wrong with Eclipse Neon.2 (4.6.2) when it uses in fedora ( dell xps 15 HD 3840x2160 )	NEW
513604	Exported app client project is dependent on appclient.bat	NEW
503463	Reopen Update does not work	NEW
496632	AssertionFailedException in AbstractTextEditor$TextEditorSavable	NEW
485788	Include Eclipse Tools for Cloud Foundry (CFT) as part of the JEE Package	NEW
483561	Inspect window close when try to resize	NEW
488993	Include Memory Analyzer Tools in Java EE package	NEW
492707	Upgrading to Mars 4.5.2 fails because of missing items	NEW
494586	Update New JEE Welcome Quicklinks to create JavaEE Web project and JSDT Project	NEW
515330	Problems occurred when invoking code from plug-in: 'org.eclipse.jface'.	NEW
518580	JavaEE package not listed on main Oxygen dev builds download page	NEW
544627	ITS team has blocked eclipse several operations due to absence of digital signature	NEW
542925	Eclipse IDE for Enterprise Java Developers 2018-12 R final release disables content assist by default.	NEW
550519	Eclipse IDE for Java EE Developers NEON 4.6 - Maven project	NEW
551096	Unable to add the jar files are the options are being disabled	NEW
551408	Include Wild Web Developer into Eclipse IDE for Enterprise Java Developers	NEW
538811	Problem Opening Wizard for an installed plugin	NEW
536107	Cant Delete projects	NEW
522712	Eclipse for JEE does not include PDE extension point schemas	NEW
520315	Toolbar contatining run,debug and breakpoints missing if customize perspective is used than eclipse oxygen crashes in ubuntu 64bit	NEW
533338	Not able to load the JAVA EE perspective and not able to see Server option in Neon 4.6.2	NEW
533975	[Accessibility] issues in Windows 'high contrast' mode.	NEW
535551	EPP Photon RC2 has duplicate vmargs in eclipse.ini	NEW
481601	Packages MUST set lower version of feature	NEW
472108	Problew when try to open Eclipse	NEW
380080	Cannot upgrade to Eclipse IDE for Java EE Developers 1.5.0.20120504-1855	NEW
368367	Eclipse.exe ICON mismatch	NEW
384419	[KeyBindings] Can't unbind the ESC key from closing a detached editor	NEW
388311	JUNO j2ee ide is not starting. throws an error saying to NEW
414369	out of heap while building the workspace for most akka projects - fixed with increased heap	NEW
389859	duplicate Information in the Progress tab appears twice	NEW
363588	New 'global debug toolbar' added to jee perspective by default	NEW
362048	eclipse java ee ide update problem	NEW
306492	The console and the editor cannot display the character exactly	NEW
265948	It is not possible to uninstall any component from eclipse bundle (e.g. j2ee)	NEW
309935	When started Eclipse displays a message: the Eclipse executable launcher was unable to locate its companion shared library	NEW
320614	Update of Java EE IDE fails due to missing dependency on Mylyn	NEW
361062	Periodic workspace save	NEW
239377	Could improve 'how to get source' instructions	NEW
414663	IDE fails to load [Mac] after update	NEW
470430	Oomph preference recorder causing unexpected results	NEW
466103	M6 downloads available today are invalid packages for OSX. I have tried from different mirrors.	NEW
460941	dark theme breaks on JEE views and features	NEW
462517	An error has occurred. See error log for more details.	NEW
459313	Eclipse crashes	NEW
459163	Update problem - no repository - for Target Management Home	NEW
429321	Include Mylyn Builds component in packages	NEW
429371	j2ee maven	NEW
441843	By default enable 'Refresh using native hooks' and 'Refresh on access'	NEW
464007	Improve Welcome/About description	NEW
367258	Duplicate parameters in eclipse.ini file	ASSIGNED
498145	Bundle-Vendor/Bundle-Name not properly externalized	ASSIGNED
471683	EGit Error on every Save operation - An internal error occurred during: 'Computing Git status for repository ..'	REOPENED
428098	'Invalid' message when trying to unzip	REOPENED

Bugs listed in italics indicate the bug has been moved to another project.

Bug ID	Title	Status
226613	20080410-1900 broken	VERIFIED
276608	tm.terminal should not include source, to save space	VERIFIED
316420	use package icon on web page	RESOLVED
323045	The MD5 given for this download does not match	RESOLVED
315701	webtools/updates site needs to be changed	RESOLVED
314969	add jsf feature to Java EE IDE package	RESOLVED
312527	eclipse-jee-helios-M7-win32 doesn't include the JAX-WS tool	RESOLVED
328948	EclipseGalileo Hanging frequently.	RESOLVED
330867	EE package includes PDE indirectly, but should be direct	RESOLVED
349073	'Too many open files' during signing check, while installing more stuff	RESOLVED
350150	Include m2e as part of this package	RESOLVED
344903	Welcome screen has some out-of-place (out dated?) items	RESOLVED
343270	Update JEE package with new Dali Common features	RESOLVED
333300	only 'Generic' displayed in the extension point	RESOLVED
312353	restore capability bundles	RESOLVED
311610	[Java EE package] Community and JPA links in welcome page goes to a 'Not Found' page	RESOLVED
280566	add capabilities (and preferences)	RESOLVED
280653	Welcome Page: Standard links are not working (Samples, Tutorials, ..)	RESOLVED
279201	update site list is not correct in package	RESOLVED
278469	Runtime-only features should not be installed in an IDE	RESOLVED
278274	improved about box graphic	RESOLVED
280654	Welcome Page: Standard links are not working (Samples, Tutorials, ..)	RESOLVED
280655	Welcome Page: Standard links are not working (Samples, Tutorials, ..)	RESOLVED
353703	Cannot update Eclipse Platform in JEE package	RESOLVED
304451	javax.transaction is configured as framework extension	RESOLVED
300913	remove references to uncertain capabilities bundles	RESOLVED
280710	progress message steps on image text	RESOLVED
278204	splash progress text should be white	RESOLVED
387136	Include egit as part of Java EE Package	RESOLVED
514206	Include EclEmma in JavaEE package	RESOLVED
520600	Exit 13	RESOLVED
512009	Add angularJS tools	RESOLVED
503321	Update does not work	RESOLVED
500188	Virtual Machine Issue	RESOLVED
528430	m2e to download sources by default	RESOLVED
533441	Hibernate tools crash to read metadata from SQL server 2014 with sqljdbc4.jar and authx64sqljdbc_auth.dll	RESOLVED
543563	Can't install plugging JautoDoc	RESOLVED
547647	Check for updates	RESOLVED
539339	Rename 'Eclipse IDE for Java EE developers' to 'Eclipse IDE for Enterprise Java developers'?	RESOLVED
537514	Regression: Java 10 support missing from WTP Photon 4.8.0	RESOLVED
534618	[Tips] [Photon] [jee] Include Tip of the Day	RESOLVED
496365	Not able to download set up eclipse jee juno SR1	RESOLVED
493596	[Welcome] Adopt Solstice theme for JEE package	RESOLVED
413545	Kepler Java EE package missing key m2e bundles	RESOLVED
414370	scala	RESOLVED
407108	ECLIPSE_.RSA in org.eclipse.equinox.launcher_1.3.0.v20120522-1813.jar does not match the one from Eclipse Juno SR1 (4.2.1)	RESOLVED
398422	JEE Package displays git configuration dialog on startup	RESOLVED
278158	need build to handle about.mappings?	RESOLVED
429370	Updating EPP Java EE Windows package from Kepler SR1 to SR2 fails	RESOLVED
461652	Eclipse would not launch, returned exit code=13	RESOLVED
487397	Chrome V8 debugger is crashing on console output	RESOLVED
492028	Add optional chromium Debugger feature to JEE EPP for Neon	RESOLVED
478181	Include Buildship as part of JavaEE Package	RESOLVED
477914	Mars can't connect to Websphere v 8.5.x	RESOLVED
469665	erro oracle pack	RESOLVED
363589	still seeing some pollution of update sites in Java EE M3	RESOLVED
281039	the What's new link on the Welcome page does not work	RESOLVED
248051	Perspective Tab	RESOLVED
248494	IDE for Java EE Developers won't start on 64-bit Vista	RESOLVED
247389	Why are not all JEE Project upate sites enabled?	RESOLVED
242191	Ganymede JEE Package dist for MacOSX has old 'Software Updates' component	RESOLVED
239275	packages should enable all their primary update sites (by default)	RESOLVED
241596	Equinox p2 installer failed to install eclipse-java-ganymede-win32.zip	RESOLVED
249885	Package fails after update because there is no metadata for the launcher.library	RESOLVED
278157	Need build to pickup 'welcome' bundle	RESOLVED
260616	PROBLEM with Eclipse Ganymede UPDATE	RESOLVED
264465	org.eclipse.pde.p2 feature should be in eclipse-jee-ganymede	RESOLVED
259813	Default Eclipse distro cannot upgrade	RESOLVED
259686	Automatic updates fail.	RESOLVED
258581	X86_64 release can not be unzip & untar with X86_64 linux	RESOLVED
238280	Missing DTP features in initial JEE 3.4 release	RESOLVED
237652	Crashes on startup	RESOLVED
231974	Ganymede M7 first startup takes several minuts and bundled plugins are not detected	RESOLVED
232269	Pre-installed packages are not installed. And cannot be either	RESOLVED
231078	JEE package update to Ganymede M7	RESOLVED
227870	icu4j jar packaged in the JavaEE install is different from the M6/M6a	RESOLVED
227351	Need to filter out TPTP features from Mac. distributions.	RESOLVED
227711	missing program icon	RESOLVED
233009	JEE package configuration updates	RESOLVED
234533	added forgotten feature, EclipseLink Support to JEE	RESOLVED
237424	datatools doc error in JEE package	RESOLVED
237425	Warning logged about undefined tm.terminal command	RESOLVED
237423	64 bit package opens to Java Perspective	RESOLVED
235338	Weird Small Window	RESOLVED
235089	Package is missing 'capabilities'	RESOLVED
265912	md5 files are 'hard to read'	RESOLVED
250523	Ganymede hangs when clicking View Error Log	RESOLVED
278141	No build ID in about dialog of JEE 3.5rc1 package	RESOLVED
276417	externailize strings for jee bundle	RESOLVED
278142	No Capabilities Preference Page in JEE 3.5rc1	RESOLVED
275817	Eclipse says 'Java EE IDE Package' as application name	RESOLVED
276415	Another rev of feature	RESOLVED
269915	New&Noteworthy for DSDP-TM missing on JEE EPP Ganymede SR2 page	RESOLVED
277394	remove pde from jee package or default 'on' capabilties.	RESOLVED
277775	Some start to product customization	RESOLVED
277863	Missing Eclipse Icon under Linux	RESOLVED
275596	default workspace is wrong directory	RESOLVED
275389	A few language improvements for M7	RESOLVED
272947	Addition of EclipseLink Galileo bundles to the Java EE package	RESOLVED
271748	There is no xsd and xsd.edit feature in the jee Galileo M6 package	RESOLVED
276606	DTP features should not include source, to save size	RESOLVED
278152	should not jar up product plugin	RESOLVED
274638	Problem while installing Eclipse Updates	RESOLVED
276609	jst and wst features should be expanded	RESOLVED
275375	Unusual exception logged on startup	RESOLVED
278145	Jee 3.5rc1 has no window icon	RESOLVED
306624	Error logged on Help > Install due to file:// repositories leaked into package	CLOSED
191557	Eclipse Tools for Java Enterprise Development contains too much	CLOSED
277364	'eclipse' symlink present in eclipse-SDK download is missing from package	CLOSED
279254	Welcome page links don't work without Internet Connectivity	CLOSED
540983	why no Eclipse IDE for Java EE Developers releases in milestone builds?	CLOSED
278154	eclipse.ini has wrong splash screen	CLOSED
538661	Upgrade to Eclipse 2018-09 M3 breaks SQL editor.	CLOSED
238541	Download page doesn't detect 64 bit linux, and offers 32bit download	CLOSED
525617	Eclipse Build download is failing - servers are down	CLOSED
278140	Help contents not available in JEE 3.5rc1 package	CLOSED
518583	There was an eclipse platform Oxygen RC4a build, but the latest EPP is RC3.	CLOSED
468874	Unsigned Content warning due to javax.persistence when installing JEE package with eclipse-installer	CLOSED
417632	Rename JEE packed into 'Web Development ' ?	CLOSED
419334	Kick PDE out of JEE package	CLOSED
422747	add code recommenders to jee package	CLOSED
317003	Ganymede-jee-64Bit-Linux-Download broken	CLOSED
385028	Java EE package should say it requires a 1.6 JRE	CLOSED
338601	Update JEE package with new Dali feature names	CLOSED
358808	EULA for the package does not match the other ones	CLOSED
374545	javax.transaction plugin is not being loaded.	CLOSED
424291	Cannot install remote marketplace locations	CLOSED
247698	RSE Terminal uses ugly fonts in JEE package	CLOSED
462087	The JEE package refer to outdated TM Terminal features	CLOSED
477947	Unable to install SOAP UI Plugin	CLOSED
312197	WebPage Editor don´t recognize EL 2.2 method call with parameter	CLOSED
313517	Add MPC to the JEE package	CLOSED
459007	Eclispe is damn slow.	CLOSED
435447	NPE in ReadManager	CLOSED
436627	Fatal Error starting Eclipse	CLOSED
436896	Unusual URISyntaxException exception in log first time help is indexed	CLOSED
486131	can't extract eclipse	CLOSED

Bugs listed in italics indicate the bug has been moved to another project.

File a Bug on this Package

Testing Details

Eclipse (@ www.eclipse.org) is an open-source Integrated Development Environment (IDE) supported by IBM. Eclipse is popular for Java application development (Java SE and Java EE) and Android apps. It also supports C/C++, PHP, Python, Perl, and other web project developments via extensible plug-ins. Eclipse is cross-platform and runs under Windows, Linux and macOS.

Eclipse Versions

The various versions are:

• Eclipse 1.0 (November 7, 2001): based on an earlier Java IDE called VisualAge from IBM.
• Eclipse 2.0 (June 28, 2002)
• Eclipse 2.1 (March 28, 2003)
• Eclipse 3.0 (June 25, 2004)
• Eclipse 3.1 (June 28, 2005)
• Eclipse 3.2 (June 30, 2006) (Callisto - named after one of the Jupiter's Galilean moons): started annual simultaneous release of all the related Eclipse projects.
• Eclipse 3.3 (June 25, 2007) (Europa - named after another Jupiter's Galilean moons)
• Eclipse 3.4 (June 19, 2008) (Ganymede - named after yet another Jupiter's Galilean moons)
• Eclipse 3.5 (June 12, 2009) (Galileo - named after the great 17th century scientist and astronomer Galileo Galilei)
• Eclipse 3.6 (June 23, 2010) (Helios - named after god of the sun in Greek Mythology)
• Eclipse 3.7 (June 23, 2011) (Indigo)
• Eclipse 4.2 (June 27, 2012) (Juno)
• Eclipse 4.3 (June 2013) (Kepler)
• Eclipse 4.4 (June 2014) (Luna)
• Eclipse 4.5 (June 2015) (Mars)
• Eclipse 4.6 (June 2016) (Neon)
• Eclipse 4.7 (June 2017) (Oxygen)
• Eclipse 4.8 (June 2018) (Photon)
• Eclipse 2018-09 (4.9) (starting quarterly release), Eclipse 2018-12 (4.10)
• Eclipse 2019-03 (4.11), Eclipse 2019-06 (4.12), Eclipse 2019-09 (4.13), Eclipse 2019-12 (4.14)
• Eclipse 2020-03 (4.15), Eclipse 2020-06 (4.16), Eclipse 2020-09 (4.17), Eclipse 2020-12 (4.18)

How to Install Eclipse IDE 2020-12 for Java Developers

How to Install Eclipse on Windows

Step 0: Install JDK

To use Eclipse for Java programming, you need to first install Java Development Kit (JDK). Read 'How to Install JDK for Windows'.

Step 1: Download

Download Eclipse from https://www.eclipse.org/downloads. Under 'Get Eclipse IDE 2029-12' ⇒ Click the link 'Download Packages' (instead of pushing the button 'Download x86_64'). For beginners, choose the 'Eclipse IDE for Java Developers' and 'Windows x86_64' (e.g., 'eclipse-java-2020-12-R-win32-x86_64.zip' - about 201MB) ⇒ Download.

Step 2: Unzip

To install Eclipse, simply unzip the downloaded file into a directory of your choice (e.g., 'c:myProject').

I prefer the zip version, because there is no need to run any installer. Moreover, you can simply delete the entire Eclipse directory when it is no longer needed (without running any un-installer). You are free to move or rename the directory. You can install (unzip) multiple copies of Eclipse in the same machine.

How to Install Eclipse on macOS

To use Eclipse for Java programming, you need to first install JDK. Read 'How to install JDK for macOS'.

To install Eclipse: Tp link tl wn951n driver windows 10.

1. Goto http://www.eclipse.org/downloads/. Under 'Get Eclipse IDE 2020-12' ⇒ Click the link 'Download Packages' (instead of pushing the button 'Download x86_64'). For beginners, select 'Eclipse IDE for Java Developers' and 'macOS x86_64'. You will receive a DMG file (e.g., 'eclipse-java-2020-12-R-macosx-cocoa-x86_64.dmg').
2. Double-click the downloaded Disk Image (DMG) file. Follow the screen instructions to install Eclipse. Eclipse will be installed under '/Applications/eclipse'. (To confirm!)

How to Install Eclipse on Ubuntu Linux

Eclipse comes with many flavors (See 'Eclipse Packages' @ https://www.eclipse.org/downloads/compare.php):

• To use Eclipse for Java programming, choose 'Eclipse IDE for Java Developers' (JavaSE) or 'Eclipse IDE for Java EE Developers' (JavaEE). You need to first install JDK. Read 'How to install JDK on Ubuntu'.
• To use Eclipse for PHP programming, choose 'Eclipse IDE for PHP Developers'.
• To use Eclipse for C/C++ programming, choose 'Eclipse IDE for C/C++ Developers'.

Nonetheless, you can install any package, and then add more features when needed.

To install Eclipse (e.g, for Java Programming):

1. Download Eclipse from http://www.eclipse.org/downloads/. Under 'Get Eclipse IDE 2020-12' ⇒ Click the link 'Download Packages' (instead of pushing the button 'Download x86_64'). Choose 'Eclipse IDE for Java Developers' for Java SE program development; or 'Eclipse IDE for Java EE Developers' for developing webapps ⇒ Linux x86_64. You will receive a tarball (e.g., 'eclipse-java-2020-12-R-linux-gtk-x86_64.tar.gz') in the '~/Downloads' folder.
2. We shall install Eclipse under /usr/local.

To run Eclipse, open the '/usr/local/eclipse' folder and click on the 'Eclipse' icon; or start a 'Terminal', enter 'eclipse'.

Lock Eclipse on Launcher

Simply start Eclipse. Right-click the Eclipse icon ⇒ 'Lock to Launcher' or 'Add to Favourite'. Star wars kotor mods.

(For older version - If the above don't work) Create a /usr/share/applications/eclipse.desktop file with the following contents:

Start Eclipse, right-click on the Eclipse icon on launcher ⇒ 'Lock to launcher'.

Writing your First Java Program in Eclipse

Step 0: Launch Eclipse

1. Launch Eclipse by running 'eclipse.exe' from the Eclipse installed directory.
2. Choose an appropriate directory for your workspace, i.e., where you would like to save your files (e.g., c:myProjecteclipse for Windows) ⇒ Launch.
3. If the 'Welcome' screen shows up, close it by clicking the 'close' button next to the 'Welcome' title.

Step 1: Create a new Java Project

For each Java application, you need to create a project to keep all the source files, classes and relevant resources.

To create a new Java project:

1. Choose 'File' menu ⇒ 'New' ⇒ 'Java project' (or 'File' ⇒ 'New' ⇒ 'Project' ⇒ 'Java project').
2. The 'New Java Project' dialog pops up.
   1. In 'Project name', enter 'FirstProject'.
   2. Check 'Use default location'.
   3. In 'JRE', select 'Use default JRE (currently 'JDK11.0.x')'. But make sure that your JDK is 1.8 and above.
   4. In 'Project Layout', check 'Use project folder as root for sources and class files'.
   Push 'Finish' button.
3. In 'Create module-info.java' dialog, Click 'Don't Create'. (Note: For easier version of Eclipse, you need to use the 'Next' Button in the previous step, and uncheck 'Create module-info.java file').

Step 2: Write a Hello-world Java Program

1. In the 'Package Explorer' (left pane) ⇒ Right-click on 'FirstProject' (or use the 'File' menu) ⇒ New ⇒ Class.
2. The 'New Java Class' dialog pops up.
   1. In 'Source folder', keep the 'FirstProject'.
   2. In 'Package', delete the content if it is not empty.
   3. In 'Name', enter 'Hello'.
   4. Check 'public static void main(String[] args)'.
   5. Don't change the rest.
   Push 'Finish' button.
3. The source file 'Hello.java' opens on the editor panel (the center pane). Enter the following codes:

Step 3: Compile & Execute the Java Program

1. There is no need to compile the Java source file in Eclipse explicitly. It is because Eclipse performs the so-called incremental compilation, i.e., the Java statement is compiled as and when it is entered.
2. To run the program, right-click anywhere on the source file 'Hello.java' (or choose 'Run' menu) ⇒ Run As ⇒ Java Application.
3. The output 'Hello, world!' appears on the Console panel (the bottom pane).

NOTES:

• You should create a NEW Java project for EACH of your Java application.
• Nonetheless, Eclipse allows you to keep more than one programs in a project, which is handy for writing toy programs (such as your tutorial exercises). To run a particular program, open and right-click on the source file ⇒ Run As ⇒ Java Application.
• Clicking the 'Run' button (with a 'Play' icon) runs the recently-run program (based on the previous configuration). Try clicking on the 'down-arrow' besides the 'Run' button.

Correcting Syntax Errors

Eclipse performs incremented compilation, as and when a source 'line' is entered. It marked a source line having syntax error with a RED CROSS. Place your cursor at the RED CROSS to view the error message.

You CANNOT RUN the program if there is any syntax error (marked by a RED CROSS before the filename). Correct all the syntax errors; and RUN the program.

HINTS: In some cases, Eclipse shows a ORANGE LIGHT-BULB (for HINTS) next to the ERROR RED-CROSS (Line 5 in the above diagram). You can click on the LIGHT-BULB to get a list of HINTS to resolve this particular error, which may or may not work!

SYNTAX WARNING: marked by a orange triangular exclaimation sign. Unlike errors, warnings may or may not cause problems. Try to fix these warnings as well. But you can RUN your program with warnings.

Read the Eclipse Documentation

At a minimum, you SHOULD browse through Eclipse's 'Workbench User Guide' and 'Java Development User Guide' - accessible via the Eclipse's 'Welcome' page or 'Help' menu. This will save you many agonizing hours trying to figure out how to do somethings later.

Debugging Programs in Eclipse

Able to use a graphics debugger to debug program is crucial in programming. It could save you countless hours guessing on what went wrong.

Step 0: Write a Java Program

The following program computes and prints the factorial of n (=1*2*3*..*n). The program, however, has a logical error and produce a wrong answer for n=20 ('The Factorial of 20 is -2102132736' - a negative number?!).

Let's use the graphic debugger to debug the program.

Step 1: Set an Initial Breakpoint

A breakpoint suspends program execution for you to examine the internal states (e.g., value of variables) of the program. Before starting the debugger, you need to set at least one breakpoint to suspend the execution inside the program. Set a breakpoint at main() method by double-clicking on the left-margin of the line containing main(). A blue circle appears in the left-margin indicating a breakpoint is set at that line.

Step 2: Start Debugger

Right click anywhere on the source code (or from the 'Run' menu) ⇒ 'Debug As' ⇒ 'Java Application' ⇒ choose 'Yes' to switch into 'Debug' perspective (A perspective is a particular arrangement of panels to suits a certain development task such as editing or debugging). The program begins execution but suspends its operation at the breakpoint, i.e., the main() method.

As illustrated in the following diagram, the highlighted line (also pointed to by a blue arrow) indicates the statement to be executed in the next step.

Step 3: Step-Over and Watch the Variables and Outputs

Click the 'Step Over' button (or select 'Step Over' from 'Run' menu) to single-step thru your program. At each of the step, examine the value of the variables (in the 'Variable' panel) and the outputs produced by your program (in the 'Console' Panel), if any. You can also place your cursor at any variable to inspect the content of the variable.

Single-stepping thru the program and watching the values of internal variables and the outputs produced is the ultimate mean in debugging programs - because it is exactly how the computer runs your program!

Step 4: Breakpoint, Run-To-Line, Resume and Terminate

As mentioned, a breakpoint suspends program execution and let you examine the internal states of the program. To set a breakpoint on a particular statement, double-click the left-margin of that line (or select 'Toggle Breakpoint' from 'Run' menu).

'Resume' continues the program execution, up to the next breakpoint, or till the end of the program.

'Single-step' thru a loop with a large count is time-consuming. You could set a breakpoint at the statement immediately outside the loop (e.g., Line 11 of the above program), and issue 'Resume' to complete the loop.

Alternatively, you can place the cursor on a particular statement, and issue 'Run-To-Line' from the 'Run' menu to continue execution up to the line.

'Terminate' ends the debugging session. Always terminate your current debugging session using 'Terminate' or 'Resume' till the end of the program.

Step 5: Switching Back to Java perspective

Click the 'Java' perspective icon on the upper-right corner to switch back to the 'Java' perspective for further programming (or 'Window' menu ⇒ Open Perspective ⇒ Java).

Important: I can's stress more that mastering the use of debugger is crucial in programming. Explore the features provided by the debuggers.

Other Debugger's Features

Step-Into and Step-Return: To debug a method, you need to use 'Step-Into' to step into the first statement of the method. ('Step-Over' runs the function in a single step without stepping through the statements within the function.) You could use 'Step-Return' to return back to the caller, anywhere within the method. Alternatively, you could set a breakpoint inside a method.

Modify the Value of a Variable: You can modify the value of a variable by entering a new value in the 'Variable' panel. This is handy for temporarily modifying the behavior of a program, without changing the source code.

Tips & Tricks

General Usages (for all Programming Tasks)

These are the features that I find to be most useful in Eclipse:

1. Maximizing Window (Double-Clicking): You can double-click on the 'header' of any panel to maximize that particular panel, and double-click again to restore it back. This feature is particularly useful for writing source code in full panel.
2. Shorthand Templates (sysout, for,..): You can type 'sysout' followed by a ctrl+space (or alt-/) as a shorthand for typing 'System.out.println()'.
   The default shortcut key (ctrl-space or alt-/) depends on the system. Check your system's shortcut key setting in 'Edit' ⇒ 'Content Assist' ⇒ 'Default'. Take note that many of you use ctrl+space to switch between input languages. You need to reconfigure either your language switching hot-key or Eclipse.
   Similarly, you can type 'for' followed by ctrl-space (or alt-/) to get a for-loop.
   You can create your own shorthand in 'Window' menu ⇒ 'Preferences' ⇒ 'Java' ⇒ 'Editor' ⇒ 'Templates'. (Alternatively, in 'Window' ⇒ 'Preferences' ⇒ type 'template' as filter text and choose 'Java' ⇒ 'Editor' ⇒ 'Templates'.)
   You can change your key settings in 'Window' menu ⇒ 'Preferences' ⇒ 'General' ⇒ 'Key' ⇒ choose 'Command', 'Content Assist'. (Alternatively, in 'Window' ⇒ 'Preferences' ⇒ type 'key' as filter text and choose 'General' ⇒ 'Key'.)
3. Intelli-Sense (ctrl-space): You can use ctrl-space to activate the 'intelli-sense' (or content assist). That is, Eclipse will offer you the choices, while you are typing.
4. Source Formatting (ctrl-shift-f): Right-click on the source. Choose 'Source' ⇒ 'Format' to let Eclipse to layout your source codes with the proper indentation.
5. Source Toggle Comment (ctrl-/): To comment/uncomment a block of codes, choose 'Source' ⇒ 'Toggle Comment'.
6. Hints for Correcting Syntax Error: If there is a syntax error on a statement, a red mark will show up on the left-margin on that statement. You could click on the 'light bulb' to display the error message, and also select from the available hints for correcting that syntax error.
7. Refactor (or Rename) (alt-shift-r): You can rename a variable, method, class, package or even the project easily in Eclipse. Select and right-click on the entity to be renamed ⇒ 'Refactor' ⇒ 'Rename'. Eclipse can rename all the occurrences of the entity.
8. Line Numbers: To show the line numbers, choose 'Window' menu ⇒ 'Preferences' ⇒ 'General' ⇒ 'Editors' ⇒ 'Text Editors' ⇒ Check the 'Show Line Numbers' Box. You can also configure many editor options, such as the number of spaces for tab. Alternatively, you can right-click on the left-margin, and check 'Show Line Numbers'.
9. Error Message Hyperlink: Click on an error message will hyperlink to the corresponding source statement.
10. Changing Font Type and Size: From 'Window' menu ⇒ 'Preferences' ⇒ 'General' ⇒ 'Appearance' ⇒ 'Colors and Fonts' ⇒ expand 'Java' ⇒ 'Java Editor Text Font' ⇒ 'Edit'. (Alternatively, in 'Window' ⇒ 'Preferences' ⇒ type 'font' as filter text and choose the appropriate entry.)
11. Unicode Support: To enable Unicode support, select 'Window' menu ⇒ Preferences ⇒ General ⇒ Workspace ⇒ Text file encoding ⇒ UTF-8. This sets the default character set used for file encoding, similar to VM's command-line option -Dfile.encoding=UTF-8. Commonly used charsets for Unicode are UTF-8, UTF-16 (with BOM), UTF-16BE, UTF-16LE. Other charsets are US-ASCII, ISO-8859-1.
12. Mouse Hover-over: In debug mode, you could configure to show the variable's value when the mouse hovers over the variable. Select 'Window' menu ⇒ 'Preferences' ⇒ 'Java' ⇒ 'Editor' ⇒ 'Hover'.
13. Comparing Two Files: In ';Package Explorer', select two files (hold the control key) ⇒Right-click ⇒ Compare with.
14. Setting Keyboard Shortcut Keys: You can set/change the keyboard shortcut keys at 'Window' ⇒ 'Preferences' ⇒ 'General' ⇒ 'Key'.
    I like to set the frequently-used commands to Ctrl-1 to Ctrl-10, for examples, 'Run Java Application' to 'Ctrl-1', etc.
15. Useful Eclipse Shortcut Keys:
    • F3: Goto the declaration of the highlighted variable/method.
    • Ctrl-Shift-G: Search for ALL references of the highlighted variable/method in workspace.
    • Ctrl-G: Search for the Declaration of a variable/method in workspace.
      Don't use Find (Ctrl-F), but use the above context-sensitive search.
    • Ctrl-Shift-F: Format the source code.
    • Ctrl-Shift-O: Organize imports.
    • Alt-Shift-R: Rename. (Don't use Find/Replace.)
    • Ctrl-Space: auto-complete.
16. Package Explorer vs. Navigator: We usually use 'Package Explorer' in programming, but it will not show you all the folders and files under the project. On the other hand, 'Navigator' is a file manager that shows the exact file structure of the project (similar to Windows Explorer). You can enable the Navigator by 'Window' ⇒ Show view ⇒ Navigator.
17. Spell Check: To enable spell check, select Window ⇒ Preferences ⇒ type 'spell' in the filter ⇒ General ⇒ Editors ⇒ Text Editors ⇒ Spelling ⇒ Check 'Enable spell checking'. Also provide a 'User defined dictionary' (with an initially empty text file).
    To correct mis-spell words, right-click and press ctrl-1 (or Edit menu ⇒ Quick Fix).
18. Eclipse's Log File: Goto Help ⇒ about Eclipse ⇒ Installation details ⇒ Configuration ⇒ View Error Log.
19. Viewing two files in split screen: Simply click and hold on the title of one file and drag it to the lower side of the screen. [To view the same file on split screen, create a new editor window by selecting Window ⇒ New Editor; and drag one window to the lower side of the screen.]
20. Block Select (Column Select): Push Alt-Shift-A to toggle between block-select mode and normal mode.
21. Snippets:
    • To view the snippet window: choose 'Window' ⇒ Show View ⇒ Snippets.
    • To create a new snippet category: Right-click ⇒ Customize ⇒ New.
    • To create a new snippet item: Copy the desired text ⇒ Select the snippet category ⇒ paste as snippet.
    • To insert a snippet: place the cursor on the desired location at the editor panel ⇒ click the snippet item.
22. Word Wrap (Line Wrap): Word-wrap (or line-wrap) is essential for editing long HTML documents without the horizontal scroll bar. However, the Eclipse's HTML Editor and Text Editor do not support word-wrap.
    You could install a plug-in called 'Word Wrap' from http://ahtik.com/eclipse-update/.
    Choose 'Help' ⇒ Install New Software ⇒ in 'Work with' Enter 'http://ahtik.com/eclipse-update/'.
    To activate word wrap, right-click on the editor panel ⇒ select 'Word Wrap'.
23. Creating 'link folder' in project: You do not have to place all the folders under the project base directory, instead, you can use so-called 'link folders' to link to folder outside the project base directory.
    To create a link folder in a project, right-click on the project ⇒ File ⇒ New ⇒ Folder ⇒ Advanced ⇒ Check Link to alternate Location (Linked Folder).
24. Running Eclipse in 'clean' mode: You can run eclipse in so-called 'clean' mode, which wipes all the cached data and re-initialize the cache, by running eclipse from command-line with '-clean' argument (i.e., 'eclipse -clean'). It is useful if something is not working proper, especially if you install a new copy of Eclipse.
25. Show the Right Margin: Window ⇒ Preferences ⇒ General ⇒ Editors ⇒ Text Editors ⇒ Show Print Margin and set the column number.
26. Let me know if you have more tips to be included here.

Update Eclipse and Install new Software

1. Install New Software: Select 'Help' menu ⇒ Install New Software ⇒ In 'Work With', pull down the select menu and choose a software site.
2. Update: Select 'Help' menu ⇒ Check for Updates ⇒.

For Java Application Development Only

1. Small Toy Java Programs: You can keep many small programs (with main()) in one Java project instead of create a new project for each toy program. To run the desired program, right-click on the source file ⇒ 'Run as' ⇒ 'Java Application'.
2. Scanner/printf() and JDK 1.5: If you encounter syntax error in using printf() or Scanner (which are available from JDK 1.5), you need to check your compiler settings. Select 'Window' menu ⇒ Preferences ⇒ open the 'Java' node ⇒ select 'Compiler' ⇒ in 'Compiler compliance level' ⇒ select the latest release, which should be '1.5' or above.
3. Command-Line Arguments: To provide command-line arguments to your Java program in Eclipse, right-click on the source file ⇒ 'Run Configurations' ⇒ Under the 'Main' panel, check that 'Project' name and 'Main Class' are appropriate ⇒ Select the 'Argument' tab ⇒ type your command-line arguments inside the 'Program Arguments' box ⇒ 'Run'.
4. Resolving Import (Ctrl-Shift-o): To ask Eclipse to insert the import statements for classes. Useful when you copy a large chunk of codes without the corresponding import statements.
5. Including Another Project: To include another project in the same work space, right-click on the project ⇒ Build Path ⇒ Configure Build Path.. ⇒ Select 'Projects' tab ⇒ 'Add..' to select project in the existing work space ⇒ OK.
6. Exporting a Project to a JAR file: Right-click on the project ⇒ Export.. ⇒ Java, JAR File ⇒ Next ⇒ Select the files to be exported ⇒ Next ⇒ Next ⇒ In 'JAR Manifest Specification' dialog, enter the main class (if you wish to run the JAR file directly) ⇒ Finish.
7. Unit Testing: If you keep your test in another project, you need to include the project under test in your Build Path (see above).
   To create a test case: Right-click on the project ⇒ New ⇒ JUnit Test Case ⇒ the 'New JUnit Test Case' dialog appears. Select 'New JUnit 4 Test'. In 'Name', enter your class name. In 'Class under test', browse and select the class to be tested.
   To run the test: Right-click ⇒ 'Run As' ⇒ 'JUnit Test'. The results are displayed in a special 'JUnit console'.
8. Adding External JAR files & Native Libraries ('.dll', '.lib', '.a', '.so'): Many external Java packages (such as JOGL, Java3D, JAMA, etc) are available to extend the functions of JDK. These packages typically provide a 'lib' directory containing JAR files ('.jar') (Java Archive - a single-file package of Java classes) and native libraries ('.dll', '.lib' for windows, '.a', '.so' for Linux and macOS).
   To include these external packages into an Eclipse's project, right-click on the project ⇒ Build Path ⇒ Add External Archives ⇒ Navigate to select the JAR files ('.jar') to be included.
   In 'Package Explorer', right-click on the JAR file added ⇒ Properties:
   • To include native libraries ('.dll', '.lib', '.a', '.so'), select 'Native Library' ⇒ 'Location Path' ⇒ 'External Folder'.
   • To include the javadoc, select 'JavaDoc Location' ⇒ 'JavaDoc URL' ⇒ You can specify a local file or a remote link.
   • To include source file (for debugging), select 'Java Source Attachment'.
   All the above options are also accessible via project's property ⇒ 'Build Path'.
   Notes: The JAR files must be included in the CLASSPATH. The native library directories must be included in JRE's property 'java.library.path', which normally but not necessarily includes all the paths from the PATH environment variable. Read 'External JAR files and Native Libraries'.
9. Creating a User Library: You can also create a Eclipse's user library to include a set of JAR files and native libraries, that can then be added into subsequent Eclipse projects.
   For example, I created a user library for 'JOGL' as follows:
   
   1. From 'Window' menu ⇒ Preferences ⇒ Java ⇒ Build Path ⇒ User Libraries ⇒ New ⇒ In 'User library name', enter 'jogl'. The 'User Library' dialog appears.
   2. In 'User Library' dialog ⇒ Select 'jogl' ⇒ Add JAR.. ⇒ Navigate to <JOGL_HOME>/lib, and select 'gluegen-rt.jar' and 'jogl.jar'.
   3. Expand the 'jogl.jar' node ⇒ Select 'Native library location: (none)' ⇒ Edit.. ⇒ External Folder.. ⇒ select <JOGL_HOME>/lib.
   4. Expand the 'jogl.jar' node ⇒ Select 'Javadoc location: (none)' ⇒ Edit.. ⇒ Javadoc in archive ⇒ In 'Archive Path', 'Browse' and select the downloaded JOGL API documentation zip-file ⇒ In 'Path within archive', 'Browse' and expand the zip-file to select the top-level path (if any) ⇒ Validate. Alternatively, you can provide the path to the un-zipped javadocs. This is needed for Eclipse to display javadoc information about classes, fields, and methods.
   5. You may provide the source files by editing 'Source attachment: (none)'. Source is needed only if you are interested to debug into the JOGL source codes.
   For EACH subsequent Java project created that uses JOGL, right-click on the project ⇒ Build Path ⇒ Add Libraries ⇒ Select 'User Library' ⇒ Check 'jogl'.
10. Running an External Program: Suppose that you want to run a Perl script on the selected file, you can configure an external tool as follows:
    1. From 'Run' menu ⇒ External Tools ⇒ External Tools Configuration.. ⇒ The 'External Tools Configuration' dialog appears.
    2. In 'Name', enter your tool name.
    3. Choose the 'Main' tab ⇒ In 'Location', 'Browse File System..' to choose the perl interpreter 'perl' ⇒ In 'Arguments', enter 'path/scriptname.pl ${resource_loc}', where ${resource_loc} is an Eclipse variable that denotes the currently selected resource with absolute path.
    4. Choose the 'Common' tab ⇒ In 'Standard Input and Output', uncheck 'Allocate Console', check 'File' and provide an output file (e.g., d:temp${resource_name}.txt).
    5. (If you use the CYGWIN perl interpreter, need to set environment variable CYGWIN=nodosfilewarning to disable warning message.)
    To run the configured external tool, select a file ⇒ run ⇒ external tool ⇒ tool name.
11. Viewing Hex Code of Primitive Variables in Debug mode: In debug perspective, 'Variable' panel ⇒ Select the 'menu' (inverted triangle) ⇒ Java ⇒ Java Preferences.. ⇒ Primitive Display Options ⇒ Check 'Display hexadecimal values (byte, short, char, int, long)'.
12. Adding a New Version of JDK/JRE: First, you can check the installed JDK/JRE via 'Window' menu ⇒ 'Preferences' ⇒ Expand 'Java' node ⇒ 'Installed JREs'. Check the 'Location' current JRE installed to make sure that it is the intended one. You can use the 'Add' button to add a new version of JRE. For program development, I recommend that you add the JDK (instead of JRE). [The 'Location' decides the extension directory used for including additional JAR files, e.g., $JAVA_HOMEjrelibext.]

For Web Developers

1. HTML Editor: Use the 'Web Page Editor' (available in Eclipse Java EE), which provides the design view (WYSISYG).
   To use the 'Web Page Editor', right-click on the HTML file, open as 'Web Page Editor'.
   To make the 'Web Page Editor' as default for HTML file, goto Window ⇒ Preferenes ⇒ General ⇒ Editor ⇒ File Associations ⇒ .htm and .html ⇒ Select 'Web page editor' ⇒ default.

File I/O in Eclipse

Suppose that your want to write a Java program, which inputs from a text file called 'xxxx.in' and outputs to a text file called 'xxxx.out'. This is a little tricky under Eclipse due to:

1. When you create a text file in Windows' Notepad and saved it as 'xxxx.in', Notepad will append the '.txt' to your file and it becomes 'xxxx.in.txt'. Worse still, the Windows' Explorer, by default, will not show the '.txt' extension. (The first thing I always do to an alien computer is to change this setting. From 'Tools' menu ⇒ Folder Options.. ⇒ View ⇒ Uncheck 'Hide extensions for known file types'.) You need to put a pair of double quotes around xxxx.in to override the default '.txt' extension. This is one good reason not to use Notepad for programming at all. You should use Eclipse to create the text file instead.
2. Which directory to keep the input file 'xxxx.in' in Eclipse?
   • If you did not separate the sources and class files into two separate directories, then the answer is straight forward, because there is only one directory to place your input file.
   • If you choose to keep your sources and class files in two separate directories, eclipse will create two sub-directories 'src' and 'bin' under the base directory. BUT you need to put your input file 'xxxx.in' in the base directory of your project, instead of the 'src' or 'bin'.

For writing simple programs:

• Put the sources, class files, and the input/output files in the same directory. (When you create a new project, select 'Use project folder as root for sources and class files' in 'Project Layout'.) (But put your sources and class files in separate directories for big project.)
• You can create you input file from eclipse directly via 'File' menu ⇒ 'New' ⇒ 'File'.
• Remember to add a newline to the end of your input file.
• You may need to right-click the project and select 'Refresh' to see the output file 'xxxx.out' created in the package explorer.
• To open the 'xxxx.in' and 'xxxx.out': right-click ⇒ Open With ⇒ Text Editor.

This is a sample JDK 1.5 program for file input/output:

Create the input text file called 'FileIOTest.in' with the following contents and terminated with a newline:

Writing Swing Applications using Eclipse GUI Builder

Eclipse provides a visual GUI builder called 'WindowBuilder' (@ https://www.eclipse.org/windowbuilder), which supports AWT/Swing, SWT (Eclipse's Standard Widget Toolkit - an alternative to JDK's AWT/Swing), XWT, GWT, eRCT.

Step 0: Install WindowBuilder

To install 'WindowBuilder', goto 'Help' ⇒ Install New Software ⇒ In 'Work with', enter 'https://download.eclipse.org/windowbuilder/latest/' (You can find the proper link from 'http://www.eclipse.org/windowbuilder/download.php') ⇒ Check 'WindowBuilder' ⇒ Next ⇒ Next ⇒ Accept the licence ⇒ Finish.

Step 1: Create a New 'Java Application' Project

1. Choose 'File' menu ⇒ 'New' ⇒ 'Java project'.
2. The 'New Java Project' dialog pops up.
   1. In the 'Project name' field, enter 'FirstSwingProject'.
   2. Check 'Use default location'.
   3. In the 'JRE' box, select 'Use default JRE (currently 'JDK1.x')'.
   4. Click 'Finish'.

Step 2: Create a Swing JFrame Subclass

1. Choose 'File' menu ⇒ 'New' ⇒ 'Others' ⇒ 'WindowBuilder' ⇒ 'Swing Designer' ⇒ 'JFrame' ⇒ 'Next'.
2. In the 'Create JFrame' dialog ⇒ Enter 'SwingMain' in the 'Name' field ⇒ 'Finish'.
3. Select the 'Design' pane.
4. In 'Layouts', select 'FlowLayout' and click on the 'design form'.
5. From 'Components', select 'JLabel' and click on the design form. Change the label text to 'Counter: '. Select a 'JTextField' and place it on the design form. Change the text to '0'. Select a 'JButton' and place it on the design form. Change the text label to 'Count'.
6. To attach a event-handler to the button, double-click the JButton to switch into the 'Source' pane, with the event-handler skeleton created. Complete the actionPerformed() as follows: Add an instance variable called count as follow:
7. You can now ready run the program. Right-click on the project ⇒ Run As ⇒ Java Application.

Eclipse Generated Codes

Study the codes generated by Eclipse GUI Builder, as follows, which is just a typical Swing application.

Eclipse for C/C++ Programming

Here.

Eclipse PDT (PHP Development Tool)

Here.

Eclipse-JavaEE and Database Development

Reference: 'Data Tools Platform User Documentation' @ Eclipse Welcome page.

You need to install:

1. 'Eclipse for Java EE' (aka 'Eclipse IDE for Enterprise Java Developers').
2. 'MySQL Community Server' and 'MySQL Connector/J Driver'. Read 'How to install and get started with MySQL'.

To use Eclipse for MySQL development:

1. Switch to 'Database Development' perspective:
   From 'Window' menu ⇒ Open Perspective ⇒ Other ⇒ Database Development.
2. Create a Database Connection: Start your MySQL database server ⇒ Right-click 'Database Connection' ⇒ New. Take note that each database connection connect to ONE particular database in the database server with a URL in the form of jdbc:mysql://localhost:3306/database-name.
   1. In 'Connection Profile', choose 'MySQL' ⇒ Next.
   2. In 'Drivers', click the icon for 'New Driver Definition' (if the driver has not been defined).
   3. In 'Specify a Driver Template and Definition Name':
      1. Choose the 'Name/Type' tab ⇒ Choose one of the database driver as our template (e.g. MySQL 5.1) for further customization ⇒ Set your 'Driver name', e.g., 'mysql-connector-java-8.0.23'.
      2. Switch to 'JAR List' tab ⇒ Clear All ⇒ Click 'Add JAR/Zip' and select the driver JAR file, e.g., mysql-connector-java-8.0.23.jar.
      3. Switch to 'Properties' tab ⇒ Check the parameters.
      4. OK.
      5. Enter the 'Database' name, URL (with the same database name), and the 'Password' ⇒ Click 'Test Connection'
      6. Finish.
   4. In 'Datasource Explorer', you can 'connect' and 'disconnect' the connection.
3. To view and edit table visually, expand database 'Schemas' to look for the table. Right-right on the table ⇒ Data ⇒ Edit. You can modify the cells and 'save' the changes.
4. To create a new SQL script, choose File ⇒ New ⇒ SQL File ⇒ You may use an existing project or create a new project (General|Project or Web|Dynamic Web Project) ⇒ Enter filename, and set the connection profile name ⇒ Finish. Enter a SQL statement (e.g., SELECT * FROM tablename) ⇒ Right-click on the text ⇒ 'Execute Current Text' or 'Execute All'.
5. To use an existing SQL file, drop the file into a project and open the SQL file. In Connection profile, set the type and connection name. Right-click on a statement ⇒ 'Execute ..'.

Developing and Deploying Webapps in Eclipse-JavaEE

Setting Up Eclipse-JavaEE for Web Development

1. Install 'Eclipse for Java EE' (aka 'Eclipse IDE for Enterprise Java Developers').
2. Install Tomcat (or Glassfish) server.
3. Configuring Web Server: Launch Eclipse ⇒ Window ⇒ Preferences ⇒ Expand the 'Server' node ⇒ 'Runtime Environments' ⇒ 'Add..' ⇒ Expand 'Apache' and select 'Apache Tomcat vX.X' ⇒ Enter your 'Tomcat Installation Directory' ⇒ 'Finish'.

Writing a Hello-world Servlet

1. Switch to 'Java EE' perspective (which is the default perspective for Eclispe-JavaEE):
   From 'Window' menu ⇒ Open Perspective ⇒ Other ⇒ Java EE.
2. Create a new Web Application Project: from 'File' ⇒ New ⇒ Dynamic Web Project (under 'Web' category) ⇒ In 'Project Name', enter 'HelloServletProject' ⇒ 'Finish'.
3. Create a new Servlet: Right-click on the project 'HelloServletProject' ⇒ New ⇒ Servlet ⇒ In 'Java Package', enter 'mypkg'; in 'Class Name', enter 'HelloServlet' ⇒ Next ⇒ In 'URL Mappings', select '/HelloServlet' ⇒ 'Edit' to '/sayhello' ⇒ Next ⇒ In 'Which method stubs would you like to create', check 'Inherited abstract method', 'doGet' and 'doPost' (default) ⇒ Finish.
   In 'HelloServlet.java', enter the following codes:

   (For Servlet 2.4/2.5 with Tomcat 6) The annotation @WebServlet is new in Servlet 3.0 and is not supported in Servlet 2.4/2.5. Hence, you need to manually configure the URL for the servlet in the Web Application Deployment Descriptor 'web.xml' under directory 'WEB-INF', as follows:

4. To execute the Servlet, right-click on the 'HelloServletProject' ⇒ 'Run As' ⇒ 'Run on Server' ⇒ Change the URL to 'http://localhost:8080/HelloServletProject/sayhello'.

Writing a Hello-world JSP (Java Server Pages)

1. Create a new Web Application: File ⇒ New ⇒ Dynamic Web Project (under 'Web' category) ⇒ In 'Project Name', enter 'HelloJSPProject' ⇒ Finish.
2. Create a new JSP File: Right-click on the project 'HelloJSPProject' ⇒ New ⇒ JSP File ⇒ The parent folder shall be 'HelloJSPProject/WebContent' ⇒ In 'File Name', enter 'hello.jsp' ⇒ 'Finish'.
3. Enter the following HTML/JSP codes:
4. To execute the JSP, right-click on 'hello.jsp' ⇒ Run As ⇒ Run on Server.

Exporting a Webapp as a WAR file

Right-click on the project to be exported ⇒ Export ⇒ WAR File ⇒ In 'Destination', specify the destination directory and filename (the filename shall be the web application name) ⇒ Finish.

1. To deploy the war file in Tomcat, simply drop the war file into Tomcat's 'webapps' folder. The war file will be automatically extracted and deployed. The web application name is the war-filename.
2. You could use WinZip (or WinRAR) to view the content of the war file, as war-file is in ZIP format.

Deploying a webapp outside the Tomcat's webapps directory

Eclipse

To deploy a webapp (called hello) outside the %TOMCAT_HOME%webapps directory, create a hello.xml file as follows and place it under the %TOMCAT_HOME%confCatalinalocalhost:

Writing a Hello-world JSF (JavaServer Faces)

[TODO]

Debugging Webapps

Eclipse Indigo Download Mac Free

You can debug a webapp just like standalone application. For example, you can set breakpoints, single-step through the programs, etc.

Eclipse Indigo Download Mac Version

REFERENCES & RESOURCES

Java Eclipse Indigo Download

1. Eclipse mother site @ https://www.eclipse.org.
2. Eclipse documentation and user guides, accessible via Eclipse's Help and menu.