ECLIPSE java.lang.OutOfMemoryError: PermGen space 错误

ECLIPSE 最近一段时间经常报错，看了日志，有如下错误信息：

ENTRY org.eclipse.ui 
4
 
0
 
2010
-
08
-
10
 
09
:
56
:
43.763
!MESSAGE Unhandled event loop exception
!STACK 0
org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.OutOfMemoryError: PermGen space)
    at org.eclipse.swt.SWT.error(SWT.java:3884
)
    at org.eclipse.swt.SWT.error(SWT.java:3799
)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:137
)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3855
)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3476
)
    at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405
)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369
)
    at org.eclipse.ui.internal.Workbench.access$4
(Workbench.java:
2221
)
    at org.eclipse.ui.internal.Workbench$5
.run(Workbench.java:
500
)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332
)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493
)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149
)
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113
)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194
)
    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:368
)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179
)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559
)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514
)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1311
)
Caused by: java.lang.OutOfMemoryError: PermGen space
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(Unknown Source)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:183
)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:576
)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:546
)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:477
)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass_LockClassLoader(ClasspathManager.java:465
)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:445
)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:211
)
    at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:376
)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:452
)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:405
)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:393
)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:105
)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at org.eclipse.ui.internal.navigator.NavigatorContentService.getExtension(NavigatorContentService.java:905
)
    at org.eclipse.ui.internal.navigator.NavigatorContentService.getExtension(NavigatorContentService.java:875
)
    at org.eclipse.ui.internal.navigator.NavigatorContentService.findRootContentExtensions(NavigatorContentService.java:511
)
    at org.eclipse.ui.internal.navigator.NavigatorContentService.findRootContentExtensions(NavigatorContentService.java:477
)
    at org.eclipse.ui.internal.navigator.NavigatorContentService.updateService(NavigatorContentService.java:380
)
    at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.inputChanged(NavigatorContentServiceContentProvider.java:598
)
    at org.eclipse.jface.viewers.ContentViewer.setInput(ContentViewer.java:270
)
    at org.eclipse.jface.viewers.StructuredViewer.setInput(StructuredViewer.java:1634
)
    at org.eclipse.ui.navigator.CommonNavigator.createPartControl(CommonNavigator.java:191
)
    at org.eclipse.wst.server.ui.internal.cnf.ServersView2.createPartControl(ServersView2.java:66
)
    at org.eclipse.ui.internal.ViewReference.createPartHelper(ViewReference.java:367
)
    at org.eclipse.ui.internal.ViewReference.createPart(ViewReference.java:226
)
    at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595
)
    at org.eclipse.ui.internal.Perspective.showView(Perspective.java:2228
)
    at org.eclipse.ui.internal.WorkbenchPage.busyShowView(WorkbenchPage.java:1067
)
    at org.eclipse.ui.internal.WorkbenchPage$20
.run(WorkbenchPage.java:
3816
)

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PermGen space的全称是Permanent Generation space,是指内存的永久保存区域OutOfMemoryError: PermGen space从表面上看就是内存益出，解决方法也一定是加大内存。说说为什么会内存益出：这一部分用于存放Class和Meta的信息,Class在被 Load的时候被放入PermGen space区域，它和和存放Instance的Heap区域不同,GC(Garbage Collection)不会在主程序运行期对PermGen space进行清理，所以如果你的APP会LOAD很多CLASS的话,就很可能出现PermGen space错误。这种错误常见在web服务器对JSP进行pre compile的时候。
改正方法，在 run.bat 中加入：-Xms256m -Xmx512m -XX:MaxNewSize=256m -XX:MaxPermSize=256m
因为项目中引用了很多的 jar 包，而这些 jar 包中的 class 信息会被 JBoss 的 class loader 加载到 PermGen space 区域，在 JVM 默认的情况下，该部分空间的大小只有 4M，在 jar 包非常多的情况下，显然是不够用的，所以通过 -XX:MaxPermSize=256m 指定最大值后即可解决问题。
另外，如果 heap 内存不足出现 java.lang.OutOfMemoryError: Java heap space 时，可以通过 -Xmx512m 指定最大 heap 内存来解决这样的问题。
解决问题的方式就是：修改了安装目录eclipse.ini文件，在最后面增加了两行

-XX:PermSize=128M
-XX:MaxPermSize=128M

这样就解决了问题。