Maven archetypes for OpenJPA - jpa

Question

Greetings.
I'm just starting to explore Maven and I use m2eclipse as to use Maven in Eclipse.
I found that there is a hibernate-based archetype with
Group Id: com.rfc.maven.archetypes and
Artifact Id: jpa-maven-archetype
Does anybody knows if there are archetypes for OpenJPA-based projected with test frameworks included?
Thanks a lot.

Answer 1

Does anybody knows if there are archetypes for OpenJPA-based projected with test frameworks included?
Not to my knowledge. So my suggestion would be to use the jpa-maven-archetype and to tweak it for OpenJPA and JPA 2.0.
First, generate a project:
$ mvn archetype:generate \
-DgroupId=com.stackoverflow \
-DartifactId=Q4161012 \
-DpackageName=com.stackoverflow.domain \
-DarchetypeGroupId=com.rfc.maven.archetypes \
-DarchetypeArtifactId=jpa-maven-archetype \
-DarchetypeVersion=1.0.0 \
-DremoteRepositories=http://maven.rodcoffin.com/repo \
-DinteractiveMode=false
Then cd into the created directory and modify the pom.xml to replace Hibernate by OpenJPA artifacts, add the OpenJPA plugin for enhancement (I did a few other minor tweaks):
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.stackoverflow</groupId>
<artifactId>Q4161012</artifactId>
<version>1.0-SNAPSHOT</version>
<name>JPA Project</name>
<properties>
<openjpa.version>2.0.1</openjpa.version>
<slf4j.version>1.6.1</slf4j.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.dbunit</groupId>
<artifactId>dbunit</artifactId>
<version>2.4.8</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.openjpa</groupId>
<artifactId>openjpa</artifactId>
<version>${openjpa.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>hsqldb</groupId>
<artifactId>hsqldb</artifactId>
<version>1.8.0.7</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.0.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>openjpa-maven-plugin</artifactId>
<version>1.1</version>
<configuration>
<includes>com/stackoverflow/domain/**/*.class</includes>
<addDefaultConstructor>true</addDefaultConstructor>
<enforcePropertyRestrictions>true</enforcePropertyRestrictions>
<!-- Pass additional properties to the Plugin here -->
<toolProperties>
<property>
<name>directory</name>
<value>otherdirectoryvalue</value>
</property>
</toolProperties>
</configuration>
<executions>
<execution>
<id>enhancer</id>
<phase>process-classes</phase>
<goals>
<goal>enhance</goal>
</goals>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.apache.openjpa</groupId>
<artifactId>openjpa</artifactId>
<version>${openjpa.version}</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
</project>
Then modify the persistence.xml for JPA 2.0 and add the OpenJPA specific properties:
<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_2_0.xsd"
version="2.0">
<persistence-unit name="Q4161012"></persistence-unit>
<persistence-unit name="Q4161012-test"
transaction-type="RESOURCE_LOCAL">
<class>com.stackoverflow.domain.User</class>
<properties>
<property name="javax.persistence.jdbc.driver"
value="org.hsqldb.jdbcDriver" />
<property name="javax.persistence.jdbc.url"
value="jdbc:hsqldb:mem:my-project-test" />
<property name="javax.persistence.jdbc.user" value="sa" />
<property name="javax.persistence.jdbc.password" value="" />
<property name="openjpa.jdbc.DBDictionary"
value="org.apache.openjpa.jdbc.sql.HSQLDictionary" />
<property name="openjpa.jdbc.SynchronizeMappings"
value="buildSchema(SchemaAction=add)"/>
</properties>
</persistence-unit>
</persistence>
And replace the following lines in UserTest.java (and clean up imports):
HibernateEntityManager em = (HibernateEntityManager) emf.createEntityManager();
DbUnitDataLoader loader = new DbUnitDataLoader(testData, em.getSession().connection());
By (OpenJPA doesn't support the EntityManager#unwrap(Object) from JPA 2.0 yet, see OPENJPA-1803, so you have to use OpenJPA specific classes):
EntityManager em = emf.createEntityManager();
OpenJPAEntityManager oem = OpenJPAPersistence.cast(em);
Connection conn = (Connection) oem.getConnection();
conn.setAutoCommit(true);
DbUnitDataLoader loader = new DbUnitDataLoader(testData, conn);
And run the test:
$ mvn clean test
[INFO] Scanning for projects...
...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO] ------------------------------------------------------------------------
...