eclipse+tomcat5开发jsp为什么经常出现这种异常？请各位进来看看

[sakulomatata]

java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
at java.util.HashMap$EntryIterator.next(Unknown Source)
at java.util.HashMap.putAllForCreate(Unknown Source)
at java.util.HashMap.clone(Unknown Source)
at mx4j.server.DefaultMBeanRepository.clone(DefaultMBeanRepository.java:56)
at mx4j.server.MBeanServerImpl.findMBeansByPattern(MBeanServerImpl.java:1603)
at mx4j.server.MBeanServerImpl.queryObjectNames(MBeanServerImpl.java:1568)
at mx4j.server.MBeanServerImpl.queryMBeans(MBeanServerImpl.java:1512)
at org.apache.coyote.tomcat5.MapperListener.init(MapperListener.java:126)
at org.apache.coyote.tomcat5.CoyoteConnector.start(CoyoteConnector.java:1510)
at org.apache.catalina.core.StandardService.start(StandardService.java:485)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:2298)
at org.apache.catalina.startup.Catalina.start(Catalina.java:556)
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.apache.catalina.startup.Bootstrap.start(Bootstrap.java:284)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:422)

[sakulomatata]

有人关注么？:(

[honbo]

在哪里出现的异常哟？

[xccgma]

郁闷，我发的帖子为什么不能显示出来呀？
我想问各位高手一个问题，我昨天装了Eclipse和Lomboz，可是Edit菜单里怎么弄也出不来Content Assist项，代码编辑器里也没有语法高亮度显示功能和Java的函数提示功能。请问该怎么办呢？