Micronaut - not possible to use PersistenceContext - jpa

Question

I'am new to micronaut and I try to follow this little project. However I would like it to work with postgres.
My application.yml looks like this:
micronaut:
application:
name: hello-world
datasources:
default:
url: 'jdbc:postgresql://localhost:5432/test'
username: test
password: test
driver-class-name: org.postgresql.Driver
jpa:
default:
properties:
hibernate:
hbm2ddl:
auto: update
show_sql: true
I have access to the database via intellij.
In the pom.xml I have the following dependencies:
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>42.2.8</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>io.micronaut.configuration</groupId>
<artifactId>micronaut-jdbc-hikari</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>io.micronaut.configuration</groupId>
<artifactId>micronaut-hibernate-jpa</artifactId>
</dependency>
Additionally it is mentioned in the link that one needs annotionProcessor, so I added this to my build profile:
<annotationProcessorPaths>
<path>
<groupId>javax.persistence</groupId>
<artifactId>javax.persistence-api</artifactId>
<version>2.2</version>
</path>
</annotationProcessorPaths>
So now everytime I try to do the following:
#PersistenceContext
private EntityManager entityManager;
I get the following error:
Caused by: io.micronaut.context.exceptions.NoSuchBeanException: No bean of type [javax.persistence.EntityManager] exists. Make sure the bean is not disabled by bean requirements (enable trace logging for 'io.micronaut.context.condition' to check) and if the bean is enabled then ensure the class is declared a bean and annotation processing is enabled (for Java and Kotlin the 'micronaut-inject-java' dependency should be configured as an annotation processor).
However I already have annotation processing enabled. And I also have a #Entity-class:
#Entity
#Table(name = "users")
public class User {
#NotBlank
#Column(name = "name")
private String userName;
public User() {
}
public User(#NotBlank final String userName) {
this.userName = userName;
}
public String getUserName() {
return userName;
}
public void setUserName(final String userName) {
this.userName = userName;
}
}
What exactly am I missing in my setup?

Answer 1

There were multiple issues with my setup.
datasource and jpa need to be at root level
The #Entity needs a #Id
So in the end the application.yml looks like this:
micronaut:
application:
name: hello-world
datasources:
default:
url: 'jdbc:postgresql://localhost:5432/test'
username: test
password: test
driver-class-name: org.postgresql.Driver
jpa:
default:
packages-to-scan:
- 'test'
properties:
hibernate:
hbm2ddl:
auto: update
show_sql: true
And the #Entity-Class needs an #Id-Attribute:
#Entity
#Table(name = "users")
public class User {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
#NotBlank
#Column(name = "user_name")
private String userName;
public User() {
}
public User(#NotBlank final String userName) {
this.userName = userName;
}
public String getUserName() {
return userName;
}
public void setUserName(final String userName) {
this.userName = userName;
}
#Override
public String toString() {
return "User{" +
"userName='" + userName + '\'' +
'}';
}
}