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All,
On 9/17/14 3:55 PM, Christopher Schultz wrote:
> I'm running Tomcat 8.0.9 on Mac OS X under Oracle's Java 7
> jdk1.7.0_65.
>
> For a long time, I've had a cleanly reloading web application,
> meaning that after my web application is reloaded (say, during
> development), the old WebappClassLoader is available for GC.
>
> After switching to Tomcat 8.x in my development environment, I've
> noticed that I can't cleanly reload anymore. Using YourKit, I've
> traced the reference to my WebappClassLoader to DBCP2.
>
> I have a JNDI DataSource whose JDBC driver is loaded from Tomcat's
> CATALINA_HOME/lib directory.
>
> It seems that org.apache.tomcat.dbcp.pool2.impl.GenericObjectPool
> has a member, factoryClassLoader, which points to my
> WebappClassLoader. I believe that it will likely retain that
> reference after multiple reloads, so I'm only leaking a single
> WebappClassLoader.
After a couple of re-loads, I can see that I'm getting each
WebappClassLoader pinned in memory by the same object graph. So that
means it's a pretty significant leak. I'll upgrade to 8.0.latest to be
sure I've got the best version.
Interestingly enough, GenericObjectPool contains a
"creationStackTrace" member. Here's its value for one of the instances:
java.lang.Exception
at
org.apache.tomcat.dbcp.pool2.impl.BaseGenericObjectPool.<init>(BaseGenericObjectPool.java:134)
at
org.apache.tomcat.dbcp.pool2.impl.GenericObjectPool.<init>(GenericObjectPool.java:104)
at
org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createConnectionPool(BasicDataSource.java:2067)
at
org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:1919)
at
org.apache.tomcat.dbcp.dbcp2.BasicDataSource.getLogWriter(BasicDataSource.java:1467)
at
org.apache.tomcat.dbcp.dbcp2.BasicDataSourceFactory.createDataSource(BasicDataSourceFactory.java:439)
at
org.apache.tomcat.dbcp.dbcp2.BasicDataSourceFactory.getObjectInstance(BasicDataSourceFactory.java:182)
at
org.apache.naming.factory.FactoryBase.getObjectInstance(FactoryBase.java:94)
at
javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:321)
at org.apache.naming.NamingContext.lookup(NamingContext.java:841)
at org.apache.naming.NamingContext.lookup(NamingContext.java:152)
at org.apache.naming.NamingContext.lookup(NamingContext.java:829)
at org.apache.naming.NamingContext.lookup(NamingContext.java:166)
at
org.apache.catalina.core.NamingContextListener.addResource(NamingContextListener.java:1084)
at
org.apache.catalina.core.NamingContextListener.createNamingContext(NamingContextListener.java:663)
at
org.apache.catalina.core.NamingContextListener.lifecycleEvent(NamingContextListener.java:256)
at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
at
org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5083)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at
org.apache.catalina.core.StandardContext.reload(StandardContext.java:3780)
at
org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:293)
at
org.apache.catalina.core.StandardContext.backgroundProcess(StandardContext.java:5539)
at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1365)
at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1369)
at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1369)
at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1345)
at java.lang.Thread.run(Thread.java:745)
- -chris
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