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From "Marcus Better (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DBCP-335) NPE with MySQL PreparedStatement
Date Tue, 01 Jun 2010 08:50:38 GMT

    [ https://issues.apache.org/jira/browse/DBCP-335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12873921#action_12873921
] 

Marcus Better commented on DBCP-335:
------------------------------------

I didn't post any example code so I'm not sure what you are referring to. And I am not trying
to check if the connection is alive. The app is executing queries, and this happens at any
time, also when all connetions are alive and well.

In any case DBCP is used in my application, as is evident from the stack trace.


> NPE with MySQL PreparedStatement
> --------------------------------
>
>                 Key: DBCP-335
>                 URL: https://issues.apache.org/jira/browse/DBCP-335
>             Project: Commons Dbcp
>          Issue Type: Bug
>    Affects Versions: 1.4
>         Environment: CloudFoundry, Linux, Sun Java 1.6.0_04, Grails 1.2.2, MySQL Connector
5.1.12
>            Reporter: Marcus Better
>
> My Grails application using MySQL and DBCP often throws an exception as below. I can
trigger it by making a simultaneous requests (three at a time) on differend threads in a ThreadPoolExecutor.
The requests would all use the same query. This triggers the exception with a few percent
probability.
> I have tried with DBCP 1.2.2 and 1.4.
> There is a similar-looking [MySQL bug|http://bugs.mysql.com/bug.php?id=41628] but they
blame the pool...
> {code}
> Exception in thread "pool-1-thread-12" java.lang.NullPointerException
>         at com.mysql.jdbc.PreparedStatement.fillSendPacket(PreparedStatement.java:2475)
>         at com.mysql.jdbc.PreparedStatement.fillSendPacket(PreparedStatement.java:2451)
>         at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2205)
>         at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:96)
>         at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:96)
>         at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:208)
>         at org.hibernate.loader.Loader.getResultSet(Loader.java:1808)
>         at org.hibernate.loader.Loader.doQuery(Loader.java:697)
>         at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
>         at org.hibernate.loader.Loader.loadEntity(Loader.java:1881)
>         at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:71)
>         at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:65)
>         at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3072)
>         at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:434)
>         at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:415)
>         at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:165)
>         at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:121)
>         at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:905)
>         at org.hibernate.impl.SessionImpl.immediateLoad(SessionImpl.java:863)
>         at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:95)
>         at org.codehaus.groovy.grails.orm.hibernate.proxy.HibernateProxyHandler.unwrapProxy(HibernateProxyHandler.java:80)
>         at org.codehaus.groovy.grails.orm.hibernate.cfg.GrailsHibernateUtil.unwrapProxy(GrailsHibernateUtil.java:322)
>         at org.codehaus.groovy.grails.orm.hibernate.cfg.GrailsHibernateUtil$unwrapProxy.call(Unknown
Source)
>         at org.codehaus.groovy.grails.plugins.orm.hibernate.HibernatePluginSupport$__clinit__closure88.doCall(HibernatePluginSupport.groovy:401)
>         at sun.reflect.GeneratedMethodAccessor381.invoke(Unknown Source)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:597)
>         at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite$PogoCachedMethodSiteNoUnwrapNoCoerce.invoke(PogoMetaMethodSite.java:266)
>         at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite.callCurrent(PogoMetaMethodSite.java:51)
>         at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:151)
>         at org.codehaus.groovy.grails.plugins.orm.hibernate.HibernatePluginSupport$__clinit__closure88.call(HibernatePluginSupport.groovy)
>         at sun.reflect.GeneratedMethodAccessor380.invoke(Unknown Source)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:597)
>         at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:86)
>         at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:234)
>         at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1049)
>         at groovy.lang.ExpandoMetaClass.invokeMethod(ExpandoMetaClass.java:923)
>         at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:880)
>         at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:924)
>         at groovy.lang.ExpandoMetaClass.invokeMethod(ExpandoMetaClass.java:923)
>         at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:880)
>         at org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:739)
>         at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:722)
>         at org.codehaus.groovy.runtime.metaclass.ClosureMetaMethod$1.invoke(ClosureMetaMethod.java:135)
>         at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:234)
>         at groovy.lang.MetaClassImpl.getProperty(MetaClassImpl.java:1594)
>         at groovy.lang.ExpandoMetaClass.getProperty(ExpandoMetaClass.java:951)
>         at groovy.lang.MetaClassImpl.getProperty(MetaClassImpl.java:3287)
>         at groovy.lang.ExpandoMetaClass.getProperty(ExpandoMetaClass.java:964)
>         at org.codehaus.groovy.runtime.callsite.PogoMetaClassGetPropertySite.getProperty(PogoMetaClassGetPropertySite.java:48)
>         at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGroovyObjectGetProperty(AbstractCallSite.java:241)
>         at org.example.MyService.onApplicationEvent(MyService.groovy:52)
>         at org.example.MyService.onApplicationEvent(MyService.groovy)
>         at org.springframework.context.event.SimpleApplicationEventMulticaster$1.run(SimpleApplicationEventMulticaster.java:92)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
>         at java.lang.Thread.run(Thread.java:619)
> {code}

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