As previously described, you need to have an appengine-web.xml 
<https://cloud.google.com/appengine/docs/standard/java/config/appref> in 
the root directory of your Java service (this is the Java version of the 
app.yaml). You then set the actual *<module>service_name</module> *property 
in the appengine-web.xml and use the mvn appengine:deploy 
<https://cloud.google.com/appengine/docs/standard/java/tools/using-maven#deploying_your_application>
 to 
deploy your Java code to your new service. 

I would recommend reviewing the Quick Start tutorial for Java 
<https://cloud.google.com/appengine/docs/standard/java/quickstart>to see 
what required configuration files are needed to deploy a Java service. You 
do not mix app.yaml and appengine-web.xml files, and you keep your services 
in separate root filepaths 
<https://cloud.google.com/appengine/docs/standard/java/an-overview-of-app-engine#versions_and_instances>
 
and deploy from those separate paths e.g:

my-app-folder
  +- default service folder -- contains app.yaml, Python code
  +- worker service folder -- contains worker.yaml, Python code
  +- javaworker service folder - contains appengine-web.xml, Java code

Your services then communicate with each other via HTTP URLFetch requests 
as per the documentations 
<https://cloud.google.com/appengine/docs/standard/java/designing-microservice-api>
 (since 
each service can only use one runtime language e.g Python OR Java). If you 
are instead requesting for multi-language support, this would indeed be a 
feature request and you can file this in the Public Issue Tracker 
<https://cloud.google.com/support/docs/issue-trackers>. 

- For all further technical support, it is recommended to continue your 
questions on Stack Overflow 
<https://cloud.google.com/support/docs/stackexchange> using the supported 
Cloud tags. 

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