Fixing Eclipse RCP Launch Error: Application "org.eclipse.ui.ide.workbench" could not be found in the registry.

If you encounter the following error message when launching your Eclipse RCP application/plugin :

!ENTRY org.eclipse.osgi 4 0 2010-12-20 00:49:08.433
!MESSAGE Application error
!STACK 1
java.lang.RuntimeException: Application "org.eclipse.ui.ide.workbench" could not be found in the registry. The applications available are: org.eclipse.ant.core.antRunner, org.eclipse.jdt.core.JavaCodeFormatter, org.eclipse.help.base.infocenterApplication, org.eclipse.help.base.helpApplication, org.eclipse.help.base.indexTool, com.abispulsa.bisnis.rcp.application, org.eclipse.equinox.app.error.
at org.eclipse.equinox.internal.app.EclipseAppContainer.startDefaultApp(EclipseAppContainer.java:248)
at org.eclipse.equinox.internal.app.MainApplicationLauncher.run(MainApplicationLauncher.java:29)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:619)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)
at org.eclipse.equinox.launcher.Main.run(Main.java:1407)
at org.eclipse.equinox.launcher.Main.main(Main.java:1383)

It means that you haven't added the following plugin to your target platform / enabled plugins:

org.eclipse.ui.ide.application

That means you'll use the default "workbench" application as used by Eclipse IDE.

When you've created your own application class which implements org.eclipse.equinox.app.IApplication interface, you need to register an Eclipse extension to org.eclipse.core.runtime.applications in your plugin.xml like the following example:

   <extension id="application"
         point="org.eclipse.core.runtime.applications">
      <application>
         <run class="com.abispulsa.bisnis.rcp.Application">
         </run>
      </application>
   </extension>

Then edit your Eclipse Application launch configuration to use your own application class.