java. net. Socketexception: invalid request: invalid mode

I have an application running on Google App Engine, which is the back end of Android applications It is basically a bridge between Android applications and the MySQL database running on my own server

The log of the app engine application is filled with warnings about exceptions caught when disconnecting The exception message is Java net. Socketexception: invalid request: invalid mode It means nothing to me

The stack trace seems to indicate that this line is the reason: mconnection close(); (mconnection is a Java. SQL. Connection object)

Except for the warning in the log, everything seems to be normal What are the possible causes of this message?

The following is a full log message with a stack trace:

10:41:05.477
[s~appname/1.389899266979631246].<stderr>: Mon Jan 11 18:41:05 UTC 2016 WARN: Caught while disconnecting...

EXCEPTION STACK TRACE:



** BEGIN NESTED EXCEPTION ** 

java.net.socketException
MESSAGE: Invalid request: Invalid how.

STACKTRACE:

java.net.socketException: Invalid request: Invalid how.
    at com.google.appengine.api.socket.socketApiHelper.translateError(SocketApiHelper.java:110)
    at com.google.appengine.api.socket.socketApiHelper.translateError(SocketApiHelper.java:119)
    at com.google.appengine.api.socket.socketApiHelper.makeSyncCall(SocketApiHelper.java:85)
    at com.google.appengine.api.socket.AppEngineSocketImpl.shutdownInput(AppEngineSocketImpl.java:664)
    at java.net.socket.shutdownInput(Socket.java:1514)
    at com.MysqL.jdbc.MysqLIO.quit(MysqLIO.java:2184)
    at com.MysqL.jdbc.ConnectionImpl.realClose(ConnectionImpl.java:4451)
    at com.MysqL.jdbc.ConnectionImpl.close(ConnectionImpl.java:1599)
    at com.appname.backend.DatabaseHelper.close(DatabaseHelper.java:71)
    at com.appname.backend.SyncEndpoint.confirm(SyncEndpoint.java:191)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_$1.run(Method_.java:171)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.privilegedInvoke(Method_.java:167)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke_(Method_.java:125)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke(Method_.java:44)
    at com.google.api.server.spi.SystemService.invokeServiceMethod(SystemService.java:363)
    at com.google.api.server.spi.SystemServiceServlet.execute(SystemServiceServlet.java:113)
    at com.google.api.server.spi.SystemServiceServlet.doPost(SystemServiceServlet.java:71)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:125)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:37)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.JdbcMysqLConnectionCleanupFilter.doFilter(JdbcMysqLConnectionCleanupFilter.java:60)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:260)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.httpconnection.handleRequest(httpconnection.java:542)
    at org.mortbay.jetty.httpconnection$RequestHandler.headerComplete(httpconnection.java:923)
    at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:78)
    at org.mortbay.jetty.httpconnection.handle(httpconnection.java:@R_502_2407@)
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:148)
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:469)
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:437)
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:444)
    at com.google.tracing.CurrentContext.runInContext(CurrentContext.java:256)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:308)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:300)
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:441)
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:235)
    at java.lang.Thread.run(Thread.java:745)


** END NESTED EXCEPTION **

Solution

This problem seems to have been solved by Google Here are their responses:

come from: https://code.google.com/p/googleappengine/issues/detail?id=12664