JPA Hibernate Metamodel generation through maven

hibernate, jpa

Solution

I'm also using JPA Metamodel generator and I don't have the problems you describe, maybe my configuration can help, I see some differences, the first one is `maven-processor-plugin`

<plugin>
  <groupId>org.bsc.maven</groupId>
  <artifactId>maven-processor-plugin</artifactId>
  <version>2.1.0</version>
  <executions>
    <execution>
      <id>process</id>
      <goals>
        <goal>process</goal>
      </goals>
      <phase>generate-sources</phase>
      <configuration>
        <processors>
          <processor>org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor</processor>
        </processors>
      </configuration>
    </execution>
  </executions>
  <dependencies>
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-jpamodelgen</artifactId>
      <!--version>1.2.0.Final</version-->
      <version>4.3.4.Final</version>
    </dependency>
  </dependencies>
</plugin>

As you can see I had to add `hibernate-jpamodelgen` as dependency and the processor attribute.

I am not sure if `build-helper-maven-plugin` is necessary to add the directory of generated sources to your source path. I am not using it and it works for me but maybe it's because I am using the default output path for generated sources.

Problem

I followed the JPA modelgen guide and i was able to generate the canonical metamodel which i need. With this pom set up: ``` <plugin> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.6</source> <target>1.6</target> <compilerArgument>-proc:none</compilerArgument> </configuration> </plugin> <plugin> <groupId>org.bsc.maven</groupId> <artifactId>maven-processor-plugin</artifactId> <version>2.0.6-redhat</version> <executions> <execution> <id>process</id> <goals> <goal>process</goal> </goals> <phase>generate-sources</phase> <configuration> <outputDirectory>target/metamodel</outputDirectory> </configuration> </execution> </executions> </plugin> <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>build-helper-maven-plugin</artifactId> <version>1.3</version> <executions> <execution> <id>add-source</id> <phase>generate-sources</phase> <goals> <goal>add-source</goal> </goals> <configuration> <sources> <source>target/metamodel</source> </sources> </configuration> </execution> </executions> </plugin> ``` The generated source is properly created in the specified directory and i have to manually specify it as a source in the eclipse project class path to use it. When i trigger a maven the logs show `cannot find symbol` or `duplicate class` and i still get successful build. So my question is, is this expected/correct behavior in creating the metamodel? or did i miss something in the cofig? Thanks

Original source