在网上找的答案，好像是在csdn上，记不清了。

eclipse.buildId=M20080221-1800
java.version=1.5.0_12
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=zh_CN
Command-line arguments: -os win32 -ws win32 -arch x86

!ENTRY org.eclipse.equinox.app 2008-12-01 10:42:18.506
!MESSAGE Product com.borland.jbuilder.product could not be found.

!ENTRY org.eclipse.osgi 4 0 2008-12-01 10:42:18.569
!MESSAGE Application error
!STACK 1
java.lang.RuntimeException: No application id has been found.
at org.eclipse.equinox.internal.app.EclipseAppContainer.startDefaultApp(EclipseAppContainer.java:236)
at org.eclipse.equinox.internal.app.EclipseAppContainer.start(EclipseAppContainer.java:98)
at org.eclipse.equinox.internal.app.Activator.addingService(Activator.java:112)
at org.osgi.util.tracker.ServiceTracker$Tracked.trackAdding(ServiceTracker.java:1064)
at org.osgi.util.tracker.ServiceTracker$Tracked.trackInitialServices(ServiceTracker.java:926)
at org.osgi.util.tracker.ServiceTracker.open(ServiceTracker.java:330)
at org.osgi.util.tracker.ServiceTracker.open(ServiceTracker.java:274)
at org.eclipse.equinox.internal.app.Activator.start(Activator.java:54)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl$2.run(BundleContextImpl.java:999)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:993)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:974)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:346)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:260)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:400)
at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:111)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:417)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:189)

具体的操作是,打开安装目录里的JBuilder.ini文件,在里面添加一行参数,我是添加到最后面,不知道放在最前面行不行.
然后再运行一下安装目录里的reset_Jbuilder.bat 文件,会弹出一个CMD窗口,需要等待几分钟,它自动关闭.就可以啦.
然后再建个JBuilder.exe的快捷方式,在里面添加参数 -clean 有些像Eclipse的快捷方式.