[jboss-user] [Persistence, JBoss/CMP, Hibernate, Database] - Unable to Connect to C3P0 Connection Pool with JPA under 4.0

[jantzen]

Hi All,

I'm attempting to connect to a PostgreSQL database via a database pool and seeing some odd behavior:

JBoss 4.0.5
c3p0-0.9.1-pre6.jar
PostgreSQL 8.1

It looks to me that the pool is starting correctly, as I see it in the logs


  | 22:26:16,920 INFO  [C3P0PooledDataSource] Bound C3P0 PooledDataSource to name 'java:EventDBPool'. Starting...
  | 22:26:16,951 INFO  [PoolBackedDataSource] Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource at 5d11c3f0[ ...
  | 22:26:16,993 INFO  [JmxKernelAbstraction] installing MBean: persistence.units:ear=DataTier.ear,jar=DataTier.jar,unitName=EventDBUnit with dependencies:
  | 22:26:16,994 INFO  [JmxKernelAbstraction] 	jboss.jca:name=EventDBPool,service=DataSourceBinding
  | 

However below I see:


  | --- MBeans waiting for other MBeans ---
  | ObjectName: persistence.units:ear=DataTier.ear,jar=DataTier.jar,unitName=EventDBUnit
  |   State: NOTYETINSTALLED
  |   I Depend On:
  |     jboss.jca:name=EventDBPool,service=DataSourceBinding
  | 
  | --- MBEANS THAT ARE THE ROOT CAUSE OF THE PROBLEM ---
  | ObjectName: jboss.jca:name=EventDBPool,service=DataSourceBinding
  |   State: NOTYETINSTALLED
  |   Depends On Me:
  |     persistence.units:ear=DataTier.ear,jar=DataTier.jar,unitName=EventDBUnit
  | 

Here's my c3p0-service.xml:
<?xml version="1.0" encoding="UTF-8"?>
  | <!DOCTYPE server PUBLIC "-//JBoss//DTD MBean Service 4.0//EN" "http://www.jboss.org/j2ee/dtd/jboss-service_4_0.dtd">
  | <server>
  |   <mbean code="com.mchange.v2.c3p0.mbean.C3P0PooledDataSource" name="jboss:service=EventDBPooledDS">  
  |     <attribute name="JndiName">java:EventDBPool</attribute>  
  |     <attribute name="JdbcUrl">jdbc:postgresql://localhost/EventDB</attribute>  
  |     <attribute name="DriverClass">org.postgresql.Driver</attribute>  
  |     <attribute name="User">myuser</attribute>  
  |     <attribute name="Password">mypass</attribute> 
  |     <attribute name="IdleConnectionTestPeriod">90</attribute>
  |     <attribute name="MaxPoolSize">15</attribute>
  |     <attribute name="MinPoolSize">5</attribute> 
  |     <attribute name="TestConnectionOnCheckin">true</attribute> 
  |       
  |     <depends>jboss:service=Naming</depends>  
  |   </mbean>
  | </server>
  | 

And my persistence.xml

  | <?xml version="1.0" encoding="UTF-8"?>
  | <persistence xmlns="http://java.sun.com/xml/ns/persistence"
  |   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  |   version="1.0">
  |   <persistence-unit name="EventDBUnit" transaction-type="JTA">
  |     <provider>org.hibernate.ejb.HibernatePersistence</provider>  
  |     <jta-data-source>java:EventDBPool</jta-data-source> 
  |     <properties>
  |       <property name="hibernate.show_sql" value="true" />   
  |     </properties>
  |   </persistence-unit>
  | 

Also, if I create an EntityManagerFactory from that persistence unit directly in my code, I'm able to use it.  However, if I use dependency injection via @PersistenceContext it doesn't work.

My questions:
1) is there an error in my persistence.xml or c3p0-service.xml preventing startup or connection to the pool?
2) ought I to be using c3p0 still or JBoss's ManagedConnectionPool?

Thanks in advance,
David

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