devon4j JpaInitializer documentation not matching releases

[hohwille]

This JavaDoc says that you need to add a spring-boot-starter-jpa:

https://github.com/devonfw/devon4j/blob/master/modules/jpa-basic/src/main/java/com/devonfw/module/jpa/dataaccess/api/JpaInitializer.java#L7

However, there is no such starter and has never been: https://repo1.maven.org/maven2/com/devonfw/java/starters/

So either we need to create such starter or change the documentation and explaing how to manually configure the @Bean properly to make this work... Should also be referenced from JpaHelper JavaDoc as otherwise this class is not usable and will fail with errors like:

java.lang.IllegalStateException: EntityManager has not yet been initialized!
    at com.devonfw.module.jpa.dataaccess.api.JpaEntityManagerAccess.getEntityManager(JpaEntityManagerAccess.java:38)
    at com.devonfw.module.jpa.dataaccess.api.JpaHelper.asEntity(JpaHelper.java:49)
    at org.example.app.ordermanagement.dataaccess.api.ItemEntity.setOrderId(ItemEntity.java:102)
...

[hohwille]

No starter required. All comes with the archetype:

• main: https://github.com/devonfw/devon4j/blob/master/templates/server/src/main/resources/archetype-resources/core/src/main/java/__packageInPathFormat__/general/dataaccess/impl/JpaConfig.java#L24
• test: https://github.com/devonfw/devon4j/blob/master/modules/test-jpa/src/main/java/com/devonfw/module/test/common/base/DbTest.java#L32

So we need to...

• update the documentation.
• consider reworking test base classes - we should derive ApplicationComponentTest from ComponentDbTest and ApplicationSubsystemTest from SubsystemDbTest. Or even better find a way to make such aspects pluggable into JUnit avoiding inheritance issues.

[hohwille]

autoclosed by PR #403 but PR #404 is still open.