Spring Data JPA - Specifications and Querydsl

Instead of explicitly configuring the apt-maven-plugin just add the following dependency to the project (note the jpa classifier):

<dependency>
  <groupId>com.querydsl</groupId>
  <artifactId>querydsl-apt</artifactId>
  <version>${querydsl.version}</version>
  <classifier>jpa</classifier>
</dependency>

Also, if you want more Querydsl features than what QuerydslPredicateExecutor has to offer check out https://github.com/infobip/infobip-spring-data-querydsl#JPA.

The way I could make this work was using the com.querydsl.apt.jpa.JPAAnnotationProcessor instead of the com.mysema.query.apt.jpa.JPAAnnotationProcessor and by changing the dependencies as follow:

<dependency>
  <groupId>com.querydsl</groupId>
  <artifactId>querydsl-apt</artifactId>
  <version>4.0.6</version>
</dependency>
<dependency>
  <groupId>com.querydsl</groupId>
  <artifactId>querydsl-jpa</artifactId>
  <version>4.0.6</version>
</dependency>

The plugin end up like this:

<plugin>
  <groupId>com.mysema.maven</groupId>
  <artifactId>apt-maven-plugin</artifactId>
  <version>1.1.3</version>
  <executions>
    <execution>
      <phase>generate-sources</phase>
      <goals>
        <goal>process</goal>
      </goals>
      <configuration>
        <outputDirectory>${project.build.directory}/generated-sources</outputDirectory>
         <processor>com.querydsl.apt.jpa.JPAAnnotationProcessor</processor>
      </configuration>
    </execution>
  </executions>
</plugin>

I also executed in the command line at the projects root mvn eclipse:eclipse to update Eclipse to include the generated sources.

Update:

Replaced the plugin maven-apt-plugin for apt-maven-plugin and changed version to 1.1.3