classloading problems with Wildfly 8.0.0 - wildfly

Question

I am trying to deploy a Spring-JPA-Hibernate web application on Wildfly. First, I had problems with Hibernate which seemed to go away with
<jboss-deployment-structure>
<deployment>
<exclusions>
<module name="org.hibernate" slot="main" />
</exclusions>
<dependencies>
<module name="org.hibernate" />
</dependencies>
</deployment>
</jboss-deployment-structure>
then however, my org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean tried to parse its mappingResources (xml file), and I got the exception
Error while parsing (.... etc)
org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.buildHibernateConfiguration(EntityManagerFactoryBuilderImpl.java:1163)
... 44 more
Caused by: org.dom4j.DocumentException: org.dom4j.DocumentFactory cannot be cast to org.dom4j.DocumentFactory
which seems to suggest there is another dom4j on the classpath.
At this point I got lost, since tinkering again with jboss-deployment-structure.xml only made the server freeze with no error message soon after startup.
Is there a simple way just to tell Wildfly not to put on the classpath at least its dom4j (or better, not to add anything at all automatically)?

Answer 1

I think that you must choose a strategy to use the classes from Wildfly or to use the classes you provide in your application.
I have the similar issue with Liferay 6.2 GA3 deployed in Wildfly 8.2. I solved it using a deployment descriptor similar to:
<?xml version="1.0" encoding="UTF-8"?>
<jboss-deployment-structure xmlns="urn:jboss:deployment-structure:1.0">
<deployment>
<exclusions>
<module name="org.apache.log4j"/>
<module name="org.hibernate"/>
<module name="org.hibernate.validator"/>
<module name="org.jboss.as.jpa"/>
<module name="org.javassist"/>
<module name="javaee.api"/>
</exclusions>
<dependencies>
<!-- add the module and remove the dom4j in your application
or exclude the module and add the jar in your application -->
<module name="org.dom4j"/>
<module name="javax.mail.api"/>
<module name="org.apache.xerces"/>
<module name="org.jboss.modules"/>
</dependencies>
</deployment>
</jboss-deployment-structure>
https://www.liferay.com/community/forums/-/message_boards/view_message/40321431#_19_message_47754919
If you want to use the Wildfly classes and deploy the JPA entities in Wildfly container, use a similar persitence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0"
xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="MyApp" transaction-type="JTA" >
<!-- Data Source -->
<jta-data-source>java:jboss/datasources/MyApplicationPool</jta-data-source>
<!-- Class -->
<class>entities here </class>
<!-- Properties -->
<properties>
<!-- the persitence unit will be deployed in Wildfly and linked to spring
using JNDI https://docs.jboss.org/author/display/WFLY8/JPA+Reference+Guide#JPAReferenceGuide-BindingEntityManagerFactory%2FEntityManagertoJNDI -->
<property name="jboss.entity.manager.factory.jndi.name" value="java:jboss/WildflyEntityManagerFactory" />
<property name="jboss.entity.manager.jndi.name" value="java:/WildflyEntityManagerVMS" />
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect" />
<!-- for the JODA datetime -->
<property name="jadira.usertype.autoRegisterUserTypes" value="true" />
</properties>
</persistence-unit>
Make reference to the Wildfly persitence unit in your Spring application:
<bean id="transactionManager"
class="org.springframework.transaction.jta.JtaTransactionManager">
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
<jee:jndi-lookup id="entityManagerFactory"
jndi-name="java:jboss/WildflyEntityManagerFactory" expected-type="javax.persistence.EntityManagerFactory" />
And you should not need any specific jboss-deployment-structure.