Add a Java language server
To add a Java language server for developing Android applications:
- Go to Preferences > Language Client > Add > Java Language Server to add a Java language server. 
- In the Name field, enter a name for the language server. Select the  (Variables) button to use a variable for the server name. (Variables) button to use a variable for the server name.
- In the Java field, enter the path to the Java executable.
- In the Java Language Server field, enter the path to the Java language server .jarfile. You can download the Java language server from Eclipse Downloads.
See also How To: Manage Language Servers, Use Qt Creator variables, and Language Servers.