Static metamodel class is not generated - jhipster

Question

I just started learning and using Jhipster. I have a question about JPA Static metamodel generation. The following is what I have done according to the Jhipster website but the static matemodel class(Class X_) is not generated:
I created an entity called: SalesByDepartment. After this entity generated, I changed its JOSN file from folder:.jhipster under my project folder by setting service to serviceImpl from no, and jpaMetamodelFiltering to true. My understanding is that I need to re-run entity sub-generator to regenerate the same entity to enable Filtering feature after I've done this change to this entity's JSON file. However, I only can find 'SalesByDepartmentCriteria' and 'SalesByDepartmentQueryService'. There is no class 'SalesByDepartment_' under the domain package. I also checked pom.xml and I can find the plugin:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<annotationProcessorPaths>
<path>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct-processor</artifactId>
<version>${mapstruct.version}</version>
</path>
<!-- For JPA static metamodel generation -->
<path>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-jpamodelgen</artifactId>
<version>${hibernate.version}</version>
</path>
</annotationProcessorPaths>
</configuration>
</plugin>
May I know if anything else I have missed to generate 'SalesByDepartment_' under domain package?
Thank you for the help.
By the way, it worked fine when I generated the first project. I did the same way and static metamodel classes were created automatically under project folder: 'com.xxx.domain'. I also can find them under target folder after build process with Maven. I guess there are something wrong but still have no idea why is that. Below is the screen shot for two projects that I have created using 'jhipster'. A is the previous project which I could generate static metamodel, but B doesn't work:
enter image description here

Answer 1

I had this problem too, the best way that I found for myself - add the dependency to maven and to annotation processor path
<dependencies>
...
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-jpamodelgen</artifactId>
<version>${hibernate.version}</version>
</dependency>
</dependencies>
annotation processor
<build>
<plugins>
...
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>11</source>
<target>11</target>
<annotationProcessorPaths>
<path>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-jpamodelgen</artifactId>
<version>${hibernate.version}</version>
</path>
...
</annotationProcessorPaths>
</configuration>
</plugin>
</plugins>
</build>
Hope it helps somebody )

Answer 2

JPA Static metamodel is generated by build process (maven or gradle) as explained in JHipster doc so you just have to build your app and you'll find SalesByDepartment_.java under target for maven and under build for gradle.

Answer 3

In my case the problem was a problem in services that the compiler don't notice.
I change a service class from implemented service to service so the implementation class was still existing, i erase that file an everything works fine.