Maven + Hibernate + Spring fun

Maven can be pain, indeed. Few days ago I put following dependency to my pom.xml:

<dependency>
   <groupId>org.hibernate</groupId>
   <artifactId>hibernate-entitymanager</artifactId>
   <version>3.3.1.ga</version>
</dependency>

but the build failed, saying that javax.transaction:jta:jar:1.0.1B cannot be resolved. After some googling I found a solution in a google cache of Dhruba Bandopadhyay's blog. The 1.0.1B can be found in a java.net repository. Actually, the poms of this version are available on ibiblio too, but the jars are missing.

So simply add

<repository>
  <id>maven2-repository.dev.java.net</id>
  <name>Java.net Maven 2 Repository</name>
  <url>http://download.java.net/maven/2/</url>
</repository>

I ran maven again, only to come across

java.lang.NoClassDefFoundError: EDU/oswego/cs/dl/util/concurrent/ConcurrentReaderHashMap
        at org.jboss.util.file.ArchiveBrowser.<clinit>(ArchiveBrowser.java:52) 

I found an opened bug in hibernate issue tracker from November 07, but it was not fixed yet. After some additional search I found that the required dependency can be found at jboss's maven repository.

<dependencies>
  <dependency>
    <groupId>oswego-concurrent</groupId>
    <artifactId>concurrent</artifactId>
    <version>1.3.4</version>
  </dependency>
</dependencies>

<repository>
  <id>jboss.org</id>
  <name>Jboss Maven 2 Repository</name>
  <url>http://repository.jboss.org/maven2/</url>
</repository>

But this piece of configuration just yielded another exception, this time it was a NoSuchMethodException, complaining about ClassValidator.<init> method missing. Although I saw the missing constructor in the hibernate jars, I was still getting this error. I spent hours searching the web, only to find many people having the same problem and trying various suggestions, but none of them worked.

The solution came today, when I read this post from Lukas Krecan. In his code I found the correct dependecies

<dependency>
  <groupId>org.hibernate</groupId>
  <artifactId>hibernate-entitymanager</artifactId>
  <version>3.3.1.ga</version>
  </dependency>
<dependency>
  <groupId>concurrent</groupId>
  <artifactId>concurrent</artifactId>
  <version>1.3.4</version>
</dependency>

and the correct Spring + JPA initialization

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
  <property name="persistenceUnitName" value="Spring.Persistence" />
  <property name="dataSource" ref="dataSource" />
  <property name="jpaProperties">
    <props>
      <prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>
    </props>
  </property>
</bean>

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
  <property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>

In META-INF/persistence.xml put:

<?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"
 xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0">

 <persistence-unit name="Spring.Persistence" transaction-type="RESOURCE_LOCAL">
  <provider>org.hibernate.ejb.HibernatePersistence</provider>
 </persistence-unit>
 
</persistence>

Thank you Lukas.