title: Intellij: java: package ... does not exist
body: <p>I have two modules, module1 and module2, in my project.</p>
  
  <p>The module1 depends on modules2, so I have added the module2 to the module1's dependency via the project structure setting.</p>
  
  <p>A problem I am facing is that module2 contains a jar file(namely ojdbc7.jar) from which the module1 is importing classes like</p>
  
  <pre><code>import oracle.sql.TIMESTAMP;
        :
  </code></pre>
  
  <p>in its classes.<br/>
  With this, Intellij can not resolve the importing class.</p>
  
  <p>How should I set IntelliJ or something up to make the class resolved?</p>