java - Which mysql timeout do I must modify? -

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i've set on raspberry pi glassfish server (4) , mysql, launch webservices android application. okay after lot of problems ! 1 question stay in mind me, why every day i'm trying execute query app, must restart glassfish have result (i have 500 internal server error).

i've searched on net, , think it's timeout mysql, close connection between him , glassfish, want know must doing solve problem ?

thanks advance !

edit

stack trace :

example.webservices.exceptions.serviceexception: l'appel au webservice rencontré une erreur 500 : not execute query   @ example.webservices.accessservice.useraccessservice.isuserexists(useraccessservice.java:52)   @ example.androidapp.asynctasks.verifyusertask.doinbackground(verifyusertask.java:38)   @ example.androidapp.asynctasks.verifyusertask.doinbackground(verifyusertask.java:20)   @ android.os.asynctask$2.call(asynctask.java:288)   @ java.util.concurrent.futuretask.run(futuretask.java:237)   @ android.os.asynctask$serialexecutor$1.run(asynctask.java:231)   @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1112)   @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:587)   @ java.lang.thread.run(thread.java:841)


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