CODEWITHSUNDEEP
javahibernatec3p0
Praveen Rawat
Praveen Rawat

Reputation: 734

Could not load com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask. java.lang.IllegalStateException

I am working with a Mobile web application, where for the database part i am using Hibernate and for the connection pooling c3p0, when i am running the application in the beginning its working fine, but after did some transaction like select, save, update, i am getting the following exception, i don't know why its happening, 

Sep 22, 2015 12:40:06 PM org.apache.catalina.loader.WebappClassLoader loadClass
INFO: Illegal access: this web application instance has been stopped already.  Could not load com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask.  The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1562)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1521)
    at com.mchange.v2.resourcepool.BasicResourcePool.destroyResource(BasicResourcePool.java:1040)
    at com.mchange.v2.resourcepool.BasicResourcePool.removeResource(BasicResourcePool.java:1507)
    at com.mchange.v2.resourcepool.BasicResourcePool.removeResource(BasicResourcePool.java:1477)
    at com.mchange.v2.resourcepool.BasicResourcePool.cullExpired(BasicResourcePool.java:1565)
    at com.mchange.v2.resourcepool.BasicResourcePool.access$1900(BasicResourcePool.java:44)
    at com.mchange.v2.resourcepool.BasicResourcePool$CullTask.run(BasicResourcePool.java:2089)
    at java.util.TimerThread.mainLoop(Timer.java:512)
    at java.util.TimerThread.run(Timer.java:462)
Exception in thread "C3P0PooledConnectionPoolManager[identityToken->2sa3m19b1vnwmg61s8v1zi|5363e54]-AdminTaskTimer" java.lang.NoClassDefFoundError: com/mchange/v2/resourcepool/BasicResourcePool$1DestroyResourceTask
    at com.mchange.v2.resourcepool.BasicResourcePool.destroyResource(BasicResourcePool.java:1040)
    at com.mchange.v2.resourcepool.BasicResourcePool.removeResource(BasicResourcePool.java:1507)
    at com.mchange.v2.resourcepool.BasicResourcePool.removeResource(BasicResourcePool.java:1477)
    at com.mchange.v2.resourcepool.BasicResourcePool.cullExpired(BasicResourcePool.java:1565)
    at com.mchange.v2.resourcepool.BasicResourcePool.access$1900(BasicResourcePool.java:44)
    at com.mchange.v2.resourcepool.BasicResourcePool$CullTask.run(BasicResourcePool.java:2089)
    at java.util.TimerThread.mainLoop(Timer.java:512)
    at java.util.TimerThread.run(Timer.java:462)
Caused by: java.lang.ClassNotFoundException: com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1676)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1521)
    ... 8 more

Hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
  <session-factory>
    <!-- Database connection settings -->
    <property name="connection.driver_class">org.postgresql.Driver</property>
    <property name="connection.username">postgres</property>
    <property name="connection.password">admin</property>
    <property name="connection.url">jdbc:postgresql://localhost:5432/db</property>

    <!-- SQL dialect -->
    <property name="dialect">com.bss.util.PostgreSQLDialectCustom</property>

    <!-- Enable Hibernate's automatic session context management -->
    <property name="current_session_context_class">thread</property>

    <!-- Echo all executed SQL to stdout -->
    <property name="show_sql">true</property>

    <!-- Use the C3P0 connection pool provider -->
    <property name="hibernate.c3p0.min_size">5</property>
    <property name="hibernate.c3p0.max_size">20</property>
    <property name="hibernate.c3p0.timeout">300</property>
    <property name="hibernate.c3p0.max_statements">50</property>
    <property name="hibernate.c3p0.idle_test_period">3000</property>

    <mapping class="com.bss.model.TestUser"/>
    <mapping class="com.bss.model.ItappFriendlist"/>
    <mapping class="com.bss.model.ItappFriendlistPK"/>
    <mapping class="com.bss.model.User"/>   
    <mapping class="com.bss.model.UserSession"/>    
  </session-factory>
</hibernate-configuration>

Upvotes: 0

Views: 8232

Answers (1)

Steve Waldman
Steve Waldman

Reputation: 14083

So, you are hitting tomcat hot-redeploy ClassLoader issues.

There are two things you should do:

  1. Make sure that when your application is shutdown, your Hibernate SessionFactory gets close()ed as well. The best place to do this is a ServletContextListener. Otherwise, on hot redeploy, c3p0 Threads from a now-discarded app will continue to be running. See SessionFactory.close()

  2. Try the settings described here to prevent stray references to objects from a defunct ClassLoader. You can just add

<property name="hibernate.c3p0.privilegeSpawnedThreads">true</property>
<property name="hibernate.c3p0.contextClassLoaderSource">library</property>

to your c3p0 config section.

(p.s. Be sure you are using a recent version of c3p0. These settings are new-ish.)

Upvotes: 6

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