How to have java-generator-maven-plugin reuse an existing enum?

[k-wall]

In our application we use CRD -> Java POJO.

In my CRD i have a field protocol which is defined like this:

                    protocol:
                      description: "Protocol specifies the network protocol this ingress expects to receive."
                      type: string
                      enum: ["TCP", "TLS"]

java-generator-maven-plugin is creating a Protocol enum as a inner class of class called ClusterIP. The same protocol object will appear elsewhere in the CRD model for the application. I don't want several definitions of the Protocol enum. I'd like to get the generator use the same definition.

I tried an existingJavaTypes but it is ignored.

                    <existingJavaTypes>

                        <io.kroxylicious.kubernetes.api.v1alpha1.kafkaproxyingressspec.ClusterIP.Protocol>
                            io.kroxylicious.kubernetes.api.common.Protocol
                        </io.kroxylicious.kubernetes.api.v1alpha1.kafkaproxyingressspec.ClusterIP.Protocol>

                    </existingJavaTypes>

I debugged the java-generator-maven-plugin and I see that io.fabric8.java.generator.nodes.JEnum#generateJava doesn't even consider the possibility that the type might have been defined as an existingJavaTypes.

Am I missing something? I'm inexperienced with java-generator-maven-plugin so I could be on the wrong track.

[andreaTP]

Hi @k-wall 👋 !
The existingJavaType works only on Objects AFAIR, we can easily improve it to work on enum too.

Do you want to take a stab at it?

[k-wall]

I'll have a go.