java 的一个错误,求指教
严重: Error processing request
java.lang.NullPointerException
at org.apache.tomcat.util.buf.CharChunk.append(CharChunk.java:355)
at org.apache.tomcat.util.http.mapper.Mapper.map(Mapper.java:707)
at org.apache.catalina.connector.CoyoteAdapter.postParseRequest(CoyoteAdapter.java:717)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:418)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
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)
上面是tomcate运行时,错误信息,不知道这是个什么错误啊,求大神指教