启动Eclipse报错：An internal error occurred during: "Updating indexes"

问题：

日志报错信息：

 在Eclipse的workspace下有个.metadata文件夹，Eclipse出现异常的log文件就在这个目录下。

!ENTRY org.eclipse.core.jobs 4 2 2018-11-26 09:07:18.601
!MESSAGE An internal error occurred during: "Updating indexes".
!STACK 0
java.lang.NoClassDefFoundError: org/eclipse/core/runtime/internal/adaptor/BasicLocation
	at org.maven.ide.eclipse.internal.index.EquinoxLocker.lock(EquinoxLocker.java:26)
	at org.maven.ide.eclipse.internal.index.NexusIndexManager.updateRemoteIndex(NexusIndexManager.java:1067)
	at org.maven.ide.eclipse.internal.index.NexusIndexManager.updateIndex(NexusIndexManager.java:1025)
	at org.maven.ide.eclipse.internal.index.NexusIndexManager$1.run(NexusIndexManager.java:632)
	at org.maven.ide.eclipse.internal.index.IndexUpdaterJob.run(IndexUpdaterJob.java:71)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Caused by: java.lang.ClassNotFoundException: org.eclipse.core.runtime.internal.adaptor.BasicLocation cannot be found by org.maven.ide.eclipse_0.12.1.20110112-1712
	at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:448)
	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:361)
	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:353)
	at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:161)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 6 more

从中可以看到：

!ENTRY org.eclipse.core.jobs 4 2 2018-11-26 09:07:18.601
!MESSAGE An internal error occurred during: "Updating indexes".
!STACK 0

解决办法：
      windows---preference---maven----取消勾选的Download repository index updates on startup