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. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To post to this group, send email to email@example.com. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/b4ec3d2c-0892-41b2-9b14-d422d011522b%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.