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Posted to dev@tomcat.apache.org by bu...@apache.org on 2012/04/22 12:38:07 UTC

DO NOT REPLY [Bug 53122] New: NullPointer Exception

https://issues.apache.org/bugzilla/show_bug.cgi?id=53122

             Bug #: 53122
           Summary: NullPointer Exception
           Product: Tomcat 7
           Version: 7.0.27
          Platform: PC
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Servlet & JSP API
        AssignedTo: dev@tomcat.apache.org
        ReportedBy: santhosh@8kmiles.com
    Classification: Unclassified


Exception while using JDBC DB Connection pool along with MySQL.

java.lang.NullPointerException
        at com.mysql.jdbc.Statement.executeUpdate(Statement.java:1418)
        at com.mysql.jdbc.Statement.executeUpdate(Statement.java:1317)
        at com.load.servlet.SQLInsert.doGet(SQLInsert.java:69)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
        at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
        at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
        at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
        at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
        at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
        at
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)
        at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)
        at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown
Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)

I do not get the above error when the request rates are low to the servlet, as
I steadily increase the number of requests to the servlet/second. The exception
occurs.

JDBC Connection pool configuration is as below : 

<Resource name="jdbc/loadtestdb" 
              auth="Container" 
              type="javax.sql.DataSource" 
              factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
              testWhileIdle="true"
              testOnBorrow="true"
              testOnReturn="false"
              validationQuery="SELECT 1"
              validationInterval="30000"
              timeBetweenEvictionRunsMillis="30000"
              maxActive="550" 
              minIdle="25" 
              maxWait="30000" 
              initialSize="500"
              removeAbandonedTimeout="60"
              removeAbandoned="true"
              logAbandoned="true"
              minEvictableIdleTimeMillis="30000" 
              jmxEnabled="true"
              jdbcInterceptors=
"org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer"
              username="root" 
              password="root" 
              driverClassName="com.mysql.jdbc.Driver"
             
url="jdbc:mysql://loadtest.xxxxxxxxxxx.us-east-1.rds.amazonaws.com:3306/loadtest"/>

and the mysql database supports by default a max of 600 connections.

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DO NOT REPLY [Bug 53122] NullPointer Exception

Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=53122

Chuck Caldarale <ch...@unisys.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID
         OS/Version|                            |All

--- Comment #1 from Chuck Caldarale <ch...@unisys.com> 2012-04-22 19:27:14 UTC ---
(In reply to comment #0)
> Exception while using JDBC DB Connection pool along with MySQL.
> 
> java.lang.NullPointerException
>         at com.mysql.jdbc.Statement.executeUpdate(Statement.java:1418)
>         at com.mysql.jdbc.Statement.executeUpdate(Statement.java:1317)
>         at com.load.servlet.SQLInsert.doGet(SQLInsert.java:69)

Note that the call to the MySQL code is coming from your servlet, not Tomcat.

Regardless, bugzilla is not a support forum; please post usage queries to the
Tomcat user's mailing list.

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