Tomcat 运行一段时间就出错? 400 报错

Tomcat 运行一段时间就出错? 400 报错

Tomcat8.0.3  采用的是Host节点配置 运行一段时间后就会出现

13-May-2015 20:48:07.797 SEVERE [http-nio-80-exec-5] org.apache.coyote.http11.AbstractHttp11Processor.process Error processing request
 java.lang.NullPointerException
	at org.apache.tomcat.util.buf.CharChunk.append(CharChunk.java:308)
	at org.apache.catalina.mapper.Mapper.map(Mapper.java:683)
	at org.apache.catalina.connector.CoyoteAdapter.postParseRequest(CoyoteAdapter.java:881)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:513)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)
	at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1517)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1474)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Unknown Source)