JBoss : persistence and EntityManager injection

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B

b4u

Golden Member
Nov 8, 2002
1,380
2
81
Hi,

I'm starting a small testing project from scratch, but I'm getting some trouble configuring JPA persistence ... I'll

post some code fragments and hope someone can enlight me on the issue.

I have an EAR, my-ear, and inside there is a single WAR, my-war. All definitions should be placed correctly, since I

can make it to pick all settings, even those defined in "persistence.xml".

my-war structure
Code: 
C:.
|   index.jsp
|
+---META-INF
|       MANIFEST.MF
|
\---WEB-INF
    |   faces-config.xml
    |   jboss-web.xml
    |   web.xml
    |
    +---classes
    |   +---com
    |   |   \---my
    |   |       \---package
    |   |               SimpleMessage.class
    |   |
    |   \---META-INF
    |           persistence.xml
    |
    \---lib

web.xml
Code: 
<web-app ...>
	...
	<resource-ref>
		<description>Datasource Connection</description>
		<res-ref-name>jdbc/MyDB</res-ref-name>
		<res-type>javax.sql.DataSource</res-type>
		<res-auth>Container</res-auth>
		<res-sharing-scope>Shareable</res-sharing-scope>
	</resource-ref>
</web-app>

jboss-web.xml
Code: 
<jboss-web>
	<resource-ref>
		<res-ref-name>jdbc/MyDB</res-ref-name>
		<jndi-name>java:/ds/MyDB</jndi-name>
	</resource-ref>
</jboss-web>

persistence.xml
Code: 
<persistence version="2.0"
	xmlns="http://java.sun.com/xml/ns/persistence"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	<persistence-unit name="punit">
		<jta-data-source>java:jdbc/MyDB</jta-data-source>
	</persistence-unit>
</persistence>

My Java code has the following class:

SimpleMessage.java
Code: 
package com.my.package;

import javax.persistence.PersistenceContext;

public class SimpleMessage {

	@PersistenceContext
	private EntityManager em;

	@PersistenceUnit(name="punit")
	private EntityManagerFactory emf;

	public void something() {
		if( em!=null ) {
			System.out.println("EntityManager Available!");
		} else {
			System.out.println("EntityManager is NULL!");
		}
		if( emf!=null ) {
			System.out.println("EntityManagerFactory Available!");
		} else {
			System.out.println("EntityManagerFactory is NULL!");
		}
	}

}

I intend to test just this ... a simple basic class where I inject the manager instance. The class is not an EJB

class, just an basic injected class.

When deploying, I get the following result:

Code: 
2010-10-13 14:09:55,197 INFO [org.jboss.web.tomcat.service.deployers.TomcatDeployment] (HDScanner) deploy, 

ctxPath=/my-war
2010-10-13 14:09:55,213 ERROR [org.jboss.web.tomcat.service.deployers.TomcatDeployment] (HDScanner) ENC setup failed
java.lang.NullPointerException
 at org.jboss.injection.PersistenceUnitHandler.getManagedEntityManagerFactory(PersistenceUnitHandler.java:149)
 at org.jboss.injection.PcEncInjector.inject(PcEncInjector.java:76)
 at org.jboss.web.tomcat.service.TomcatInjectionContainer.populateEnc(TomcatInjectionContainer.java:482)

However, if in "persistence.xml" I instead define the datasource reference as "java:ds/MyDB" (datasource name

definition on JBoss), I obtain the following result:

Code: 
2010-10-13 14:15:20,552 INFO [org.jboss.jpa.deployment.PersistenceUnitDeployment] (HDScanner) Starting persistence 

unit persistence.unit:unitName=my-ear-1.0.0.ear/my-war-1.0.0.war#punit
2010-10-13 14:15:20,552 INFO [org.hibernate.ejb.Ejb3Configuration] (HDScanner) Processing PersistenceUnitInfo [
 name: punit
 ...]
2010-10-13 14:15:20,552 WARN [org.hibernate.ejb.Ejb3Configuration] (HDScanner) Persistence provider caller does not 

implement the EJB3 spec correctly. PersistenceUnitInfo.getNewTempClassLoader() is null.
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.search.HibernateSearchEventListenerRegister] (HDScanner) Unable to 

find org.hibernate.search.event.FullTextIndexEventListener on the classpath. Hibernate Search is not enabled.
2010-10-13 14:15:20,568 INFO [org.hibernate.connection.ConnectionProviderFactory] (HDScanner) Initializing 

connection provider: org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider
2010-10-13 14:15:20,568 INFO [org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider] (HDScanner) Using 

provided datasource
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) RDBMS: MySQL, version: 

5.1.41-3ubuntu12.6
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) JDBC driver: MySQL-AB JDBC Driver, 

version: mysql-connector-java-5.1.10 ( Revision: ${svn.Revision} )
2010-10-13 14:15:20,568 INFO [org.hibernate.dialect.Dialect] (HDScanner) Using dialect: 

org.hibernate.dialect.MySQLDialect
2010-10-13 14:15:20,568 INFO [org.hibernate.transaction.TransactionFactoryFactory] (HDScanner) Transaction strategy: 

org.hibernate.ejb.transaction.JoinableCMTTransactionFactory
2010-10-13 14:15:20,568 INFO [org.hibernate.transaction.TransactionManagerLookupFactory] (HDScanner) instantiating 

TransactionManagerLookup: org.hibernate.transaction.JBossTransactionManagerLookup
2010-10-13 14:15:20,568 INFO [org.hibernate.transaction.TransactionManagerLookupFactory] (HDScanner) instantiated 

TransactionManagerLookup
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Automatic flush during 

beforeCompletion(): disabled
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Automatic session close at end of 

transaction: disabled
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) JDBC batch size: 15
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) JDBC batch updates for versioned data: 

disabled
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Scrollable result sets: enabled
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) JDBC3 getGeneratedKeys(): enabled
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Connection release mode: auto
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Maximum outer join fetch depth: 2
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Default batch fetch size: 1
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Generate SQL with comments: disabled
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Order SQL updates by primary key: 

disabled
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Order SQL inserts for batching: 

disabled
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Query translator: 

org.hibernate.hql.ast.ASTQueryTranslatorFactory
2010-10-13 14:15:20,568 INFO [org.hibernate.hql.ast.ASTQueryTranslatorFactory] (HDScanner) Using 

ASTQueryTranslatorFactory
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Query language substitutions: {}
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) JPA-QL strict compliance: enabled
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Second-level cache: enabled
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Query cache: disabled
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Cache region factory : 

org.hibernate.cache.impl.bridge.RegionFactoryCacheProviderBridge
2010-10-13 14:15:20,568 INFO [org.hibernate.cache.impl.bridge.RegionFactoryCacheProviderBridge] (HDScanner) Cache 

provider: org.hibernate.cache.HashtableCacheProvider
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Optimize cache for minimal puts: 

disabled
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Cache region prefix: 

persistence.unit:unitName=my-ear-1.0.0.ear/my-war-1.0.0.war#punit
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Structured second-level cache entries: 

disabled
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Statistics: disabled
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Deleted entity synthetic identifier 

rollback: disabled
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Default entity-mode: pojo
2010-10-13 14:15:20,568 INFO [org.hibernate.cfg.SettingsFactory] (HDScanner) Named query checking : enabled
2010-10-13 14:15:20,568 INFO [org.hibernate.impl.SessionFactoryImpl] (HDScanner) building session factory
2010-10-13 14:15:20,568 INFO [org.hibernate.impl.SessionFactoryObjectFactory] (HDScanner) Factory name: 

persistence.unit:unitName=my-ear-1.0.0.ear/my-war-1.0.0.war#punit
2010-10-13 14:15:20,568 INFO [org.hibernate.util.NamingHelper] (HDScanner) JNDI InitialContext 

properties:{java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory, 

java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces}
2010-10-13 14:15:20,584 INFO [org.hibernate.impl.SessionFactoryObjectFactory] (HDScanner) Bound factory to JNDI 

name: persistence.unit:unitName=my-ear-1.0.0.ear/my-war-1.0.0.war#punit
2010-10-13 14:15:20,584 WARN [org.hibernate.impl.SessionFactoryObjectFactory] (HDScanner) InitialContext did not 

implement EventContext
2010-10-13 14:15:20,584 INFO [org.hibernate.util.NamingHelper] (HDScanner) JNDI InitialContext 

properties:{java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory, 

java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces}
2010-10-13 14:15:20,724 INFO [org.jboss.web.tomcat.service.deployers.TomcatDeployment] (HDScanner) deploy, 

ctxPath=/my-war
2010-10-13 14:15:20,755 INFO [javax.enterprise.resource.webcontainer.jsf.config] (HDScanner) Initializing Mojarra 

(1.2_12-b01-FCS) for context '/my-war'

2010-10-13 14:15:20,896 ERROR [STDERR] (HDScanner) SLF4J: Class path contains multiple SLF4J bindings.
2010-10-13 14:15:20,896 ERROR [STDERR] (HDScanner) SLF4J: Found binding in [vfszip:/C:/Program 

Files/Java/jboss-5.1.0.GA/common/lib/slf4j-jboss-logging.jar/org/slf4j/impl/StaticLoggerBinder.class]
2010-10-13 14:15:20,896 ERROR [STDERR] (HDScanner) SLF4J: Found binding in [vfszip:/C:/Program 

Files/Java/jboss-5.1.0.GA/server/default/deploy/my-ear-1.0.0.ear/logback-classic-0.9.20.jar/org/slf4j/impl/StaticLog

gerBinder.class]
2010-10-13 14:15:20,912 ERROR [STDERR] (HDScanner) SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for 

an explanation.



So my questions are:


1# After invoking "SimpleMessage.something();" (using the second option "java:ds/MyDB" in "persistence.xml")

I receive the following output:

Code: 
EntityManager is NULL!
EntityManagerFactory is NULL!

So no injection happened ... shouldn't it occur? what happened?


2# I was assuming that "web.xml" defines the JNDI to be used inside my webapp, then "jboss-web.xml" would map

that name into the internall JNDI defined in JBoss.

In this case for JBoss usage, if changing to IBM WebSphere I would use another mapping config file.

BUT ... I was also assuming that "persistence.xml" would define the JNDI that is defined in "web.xml" ... and not

the one defined in application server level ... so I would get an abstraction from whichever server I'll deploy my

project into.

Shouldn't this be working like that? What am I doing wrong?



Any help would be appreciated ... I really need to understand and put this to work ...

Thanks.
 
Last edited:
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