title: Gradle not generate jar
body: <p>I have a problem with gradle. 
  My project It consists of several modules (osgi). 
  When I run command:
  ./gradlew clean assemble
  Gradle generate the jar file for each module, but I want use the command:
  ./gradlew clean compileJava
  to speed up the work, but with this command gradle don't generate the jar file for two module. 
  what could be the reason?</p>