我下载SVN插件后重启eclipse，无法启动。
错误日志如下：
!SESSION 2014-10-21 10:01:37.416 -----------------------------------------------
eclipse.buildId=v21.1.0-569685
java.version=1.7.0_17
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=zh_CN
Framework arguments: -product com.android.ide.eclipse.adt.package.product
Command-line arguments: -os win32 -ws win32 -arch x86 -product com.android.ide.eclipse.adt.package.product
!ENTRY org.eclipse.osgi 2 0 2014-10-21 10:01:39.550
!MESSAGE One or more bundles are not resolved because the following root constraints are not resolved:
!SUBENTRY 1 org.eclipse.osgi 2 0 2014-10-21 10:01:39.550
!MESSAGE Bundle reference:file:plugins/org.eclipse.wst.common.snippets_1.2.100.v201103281740.jar was not resolved.
!SUBENTRY 2 org.eclipse.wst.common.snippets 2 0 2014-10-21 10:01:39.550
!MESSAGE Missing required bundle org.eclipse.ui.ide_[3.4.0,4.0.0).
!SUBENTRY 1 org.eclipse.osgi 2 0 2014-10-21 10:01:39.550
!MESSAGE Bundle reference:file:plugins/org.eclipse.compare_3.5.300.v20120522-1148.jar was not resolved.
!SUBENTRY 2 org.eclipse.compare 2 0 2014-10-21 10:01:39.550
!MESSAGE Missing required bundle org.eclipse.ui.ide_[3.3.0,4.0.0).
!SUBENTRY 1 org.eclipse.osgi 2 0 2014-10-21 10:01:39.550
!MESSAGE Bundle reference:file:plugins/org.eclipse.cdt.make.ui_7.1.2.201202111925.jar was not resolved.
!SUBENTRY 2 org.eclipse.cdt.make.ui 2 0 2014-10-21 10:01:39.550
!MESSAGE Missing required bundle org.eclipse.ui.ide_[3.2.0,4.0.0).
!SUBENTRY 1 org.eclipse.osgi 2 0 2014-10-21 10:01:39.550
!MESSAGE Bundle reference:file:plugins/org.eclipse.wst.common.frameworks.ui_1.2.100.v201105122000.jar was not resolved.
!SUBENTRY 2 org.eclipse.wst.common.frameworks.ui 2 0 2014-10-21 10:01:39.550
!MESSAGE Missing required bundle org.eclipse.ui.ide_[3.4.0,4.0.0).
!SUBENTRY 1 org.eclipse.osgi 2 0 2014-10-21 10:01:39.550
!MESSAGE Bundle reference:file:plugins/com.android.ide.eclipse.adt_21.1.0.2013-2-6-0-46.jar was not resolved.
!SUBENTRY 2 com.android.ide.eclipse.adt 2 0 2014-10-21 10:01:39.550
!MESSAGE Missing required bundle org.eclipse.ui.ide_0.0.0.
!SUBENTRY 1 org.eclipse.osgi 2 0 2014-10-21 10:01:39.550
!MESSAGE Bundle reference:file:plugins/org.eclipse.cdt.ui_5.3.2.201202111925.jar was not resolved.
!SUBENTRY 2 org.eclipse.cdt.ui 2 0 2014-10-21 10:01:39.550
!MESSAGE Missing required bundle org.eclipse.ui.ide_[3.3.0,4.0.0).
!SUBENTRY 1 org.eclipse.osgi 2 0 2014-10-21 10:01:39.550
!MESSAGE Bundle reference:file:plugins/org.eclipse.cdt.managedbuilder.ui_8.0.2.201202111925.jar was not resolved.
!SUBENTRY 2 org.eclipse.cdt.managedbuilder.ui 2 0 2014-10-21 10:01:39.551
!MESSAGE Missing required bundle org.eclipse.ui.ide_[3.2.0,4.0.0).
!SUBENTRY 1 org.eclipse.osgi 2 0 2014-10-21 10:01:39.551
!MESSAGE Bundle reference:file:plugins/org.tigris.subversion.subclipse.ui_1.8.21.jar was not resolved.
!SUBENTRY 2 org.tigris.subversion.subclipse.ui 2 0 2014-10-21 10:01:39.551
!MESSAGE Missing required bundle org.eclipse.ui.ide_0.0.0.
!SUBENTRY 1 org.eclipse.osgi 2 0 2014-10-21 10:01:39.551
!MESSAGE Bundle reference:file:plugins/com.android.ide.eclipse.ddms_21.1.0.2013-2-6-0-46.jar was not resolved.
!SUBENTRY 2 com.android.ide.eclipse.ddms 2 0 2014-10-21 10:01:39.551
!MESSAGE Missing required bundle org.eclipse.ui.ide_0.0.0.
!SUBENTRY 1 org.eclipse.osgi 2 0 2014-10-21 10:01:39.551
!MESSAGE Bundle reference:file:plugins/org.eclipse.wst.validation.ui_1.2.300.v201201050300.jar was not resolved.
!SUBENTRY 2 org.eclipse.wst.validation.ui 2 0 2014-10-21 10:01:39.551
!MESSAGE Missing required bundle org.eclipse.ui.ide_[3.4.0,4.0.0).
!SUBENTRY 1 org.eclipse.osgi 2 0 2014-10-21 10:01:39.551
!MESSAGE Bundle reference:file:plugins/org.eclipse.wst.sse.ui_1.3.2.v201201041522.jar was not resolved.
!SUBENTRY 2 org.eclipse.wst.sse.ui 2 0 2014-10-21 10:01:39.551
!MESSAGE Missing required bundle org.eclipse.ui.ide_[3.5.0,4.0.0).
!SUBENTRY 1 org.eclipse.osgi 2 0 2014-10-21 10:01:39.551
!MESSAGE Bundle reference:file:plugins/org.eclipse.egit.ui_2.2.0.201212191850-r.jar was not resolved.
!SUBENTRY 2 org.eclipse.egit.ui 2 0 2014-10-21 10:01:39.551
!MESSAGE Missing required bundle org.eclipse.ui.ide_[3.4.0,4.0.0).
java.lang.RuntimeException: Application "org.eclipse.ui.ide.workbench" could not be found in the registry. The applications available are: org.eclipse.equinox.app.error, org.eclipse.equinox.p2.director, org.eclipse.equinox.p2.garbagecollector.application, org.eclipse.equinox.p2.publisher.InstallPublisher, org.eclipse.equinox.p2.publisher.EclipseGenerator, org.eclipse.equinox.p2.publisher.ProductPublisher, org.eclipse.equinox.p2.publisher.FeaturesAndBundlesPublisher, org.eclipse.equinox.p2.reconciler.application, org.eclipse.equinox.p2.repository.repo2runnable, org.eclipse.equinox.p2.repository.metadataverifier, org.eclipse.equinox.p2.artifact.repository.mirrorApplication, org.eclipse.equinox.p2.metadata.repository.mirrorApplication, org.eclipse.equinox.p2.updatesite.UpdateSitePublisher, org.eclipse.equinox.p2.publisher.UpdateSitePublisher, org.eclipse.equinox.p2.publisher.CategoryPublisher, org.eclipse.update.core.standaloneUpdate, org.eclipse.update.core.siteOptimizer, org.eclipse.ant.core.antRunner, org.eclipse.help.base.infocenterApplication, org.eclipse.help.base.helpApplication, org.eclipse.help.base.indexTool, org.eclipse.e4.ui.workbench.swt.E4Application, org.eclipse.e4.ui.workbench.swt.GenTopic, org.eclipse.jdt.core.JavaCodeFormatter, org.eclipse.jdt.apt.core.aptBuild, org.eclipse.cdt.core.GeneratePDOM, org.eclipse.cdt.managedbuilder.core.headlessbuild, org.eclipse.cdt.codan.core.application.
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:353)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180)
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:629)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
at org.eclipse.equinox.launcher.Main.run(Main.java:1438)
------解决思路----------------------
1：加一个 -clean参数启动eclipse。
2：清空workspace下的 .matadata目录
3：把eclipse /configreation目录下的（忘记了是那些目录）删除就可以了，或者全删了，拷贝一个可以跑起来的版本。
先试试1，不行就1、2、3。想深究就看看OSGI，赶时间就重解压个eclipse吧。