tomcat(hp)+mysql(redhat 8)的500错误。求救(解决问题送200)

再看日志文件的信息：
StandardWrapperValve[default]: Servlet.service() for servlet default threw exception
java.net.SocketException: Broken pipe
        at java.net.SocketOutputStream.socketWrite0(Native Method)
        at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
        at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
        at org.apache.coyote.http11.InternalOutputBuffer$OutputStreamOutputBuffer.doWrite(InternalOutputBuffer.
java:668)
    at org.apache.catalina.servlets.DefaultServlet.copyRange(DefaultServlet.java:1996)
        at org.apache.catalina.servlets.DefaultServlet.copy(DefaultServlet.java:1745)
        at org.apache.catalina.servlets.DefaultServlet.serveResource(Default      at org.apache.coyote.http11.filters.IdentityOutputFilter.doWrite(IdentityOutputFilter.java:160)
        at org.apache.coyote.http11.InternalOutputBuffer.doWrite(InternalOutputBuffer.java:523)
        at org.apache.coyote.Response.doWrite(Response.java:524)
        at org.apache.coyote.tomcat4.OutputBuffer.realWriteBytes(OutputBuffer.java:384)
        at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:439)
        at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:359)
        at org.apache.coyote.tomcat4.OutputBuffer.writeBytes(OutputBuffer.java:411)
        at org.apache.coyote.tomcat4.OutputBuffer.write(OutputBuffer.java:398)
        at org.apache.coyote.tomcat4.CoyoteOutputStream.write(CoyoteOutputStream.java:110)
      Servlet.java:1073)
        at org.apache.catalina.servlets.DefaultServlet.doGet(DefaultServlet.java:506)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.j
ava:643)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.j
ava:643)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.j
ava:641)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
        at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.j
ava:643)
        at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.j
ava:641)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.j
ava:641)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.j
ava:643)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
        at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:594)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.jav
a:392)
        at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)
        at java.lang.Thread.run(Thread.java:536)