linux下tomcat错误日志显示不全怎么办

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linux下tomcat错误日志显示不全怎么办10

tomcat下错误日志有时候显示部分，有些能全部显示，如下
Aug 30, 2012 10:32:31 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet FrameServlet threw exception
java.lang.NullPointerException
        at com.zengame.service.hero.UserHeroService.queryPubHero(UserHeroService.java:465)
        at com.zengame.command.hero.QueryPubHeroCommand.execute(QueryPubHeroCommand.java:31)
        at com.zengame.command.base.BaseCommand.doCommand(BaseCommand.java:149)
        at com.zengame.servlet.FrameServlet.doPost(FrameServlet.java:209)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at com.zengame.filter.EncodingFilter.doFilter(EncodingFilter.java:32)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:242)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:201)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:163)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:108)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:556)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:402)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:249)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:267)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:245)
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:260)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)
Aug 30, 2012 10:35:00 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet FrameServlet threw exception
java.lang.NullPointerException
Aug 30, 2012 10:37:39 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet FrameServlet threw exception
java.lang.NullPointerException
Aug 30, 2012 10:40:47 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet FrameServlet threw exception
java.lang.NullPointerException

问题补充
怎么才能让它全部显示错误信息 - -

Linux

2012年8月30日 13:59

dwjun236
10
0 0 1

2个答案按时间排序按投票排序

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这不是tomcat的问题，而是java内部：

private void printStackTraceAsCause(PrintStream s,
                                        StackTraceElement[] causedTrace)
    {
        // assert Thread.holdsLock(s);

        // Compute number of frames in common between this and caused
        StackTraceElement[] trace = getOurStackTrace();
        int m = trace.length-1, n = causedTrace.length-1;
        while (m >= 0 && n >=0 && trace[m].equals(causedTrace[n])) {
            m--; n--;
        }
        int framesInCommon = trace.length - 1 - m;

        s.println("Caused by: " + this);
        for (int i=0; i <= m; i++)
            s.println("\tat " + trace[i]);
        if (framesInCommon != 0)
            s.println("\t... " + framesInCommon + " more");

        // Recurse if we have a cause
        Throwable ourCause = getCause();
        if (ourCause != null)
            ourCause.printStackTraceAsCause(s, trace);
    }

异常最大深度是有限制的（就是m）

        int m = trace.length-1, n = causedTrace.length-1;
        while (m >= 0 && n >=0 && trace[m].equals(causedTrace[n])) {
            m--; n--;
        }
       省略了之后的一些（这一些会在它的原因中继续输出[即递归数据]）

如果你需要全的可以自己获取StackTraceElement 然后打印。

输出的异常的最下边是最原始的原因，，往上就是封装

如
    AException
       BException
           CException --->这是真正原因

2012年8月30日 14:09

jinnianshilongnian
7280
2 3 591

添加评论

0 0

ava.lang.NullPointerException
at com.zengame.service.hero.UserHeroService.queryPubHero(UserHeroService.java:465)
at
UserHeroServic.java 465行
明显的空指针
可以设置日志输出的位置,大小来控制
#log4j.appender.RF.File=./log/log.txt
#log4j.appender.RF.MaxFileSize=500MB
log4j日志参考文档：
http://demojava.iteye.com/blog/1462756

2012年8月30日 14:06