title: Sonarqube synchronization error
body: <p>I have created a custom rule for sonarqube in Java.
  The rule is created and i can see that in the sonarqube UI. </p>
  
  <p>Now the problem is when i try to check that rule from eclipse. I am getting error:
  :Synchronization issue, has encountered some problem".
  <a href="https://i.stack.imgur.com/96Gyo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/96Gyo.png" alt="enter image description here"></a></p>
  
  <p>When I checked log from eclipse, i have this:</p>
  
  <pre><code>!ENTRY org.sonar.ide.eclipse.core 4 4 2016-04-18 10:02:36.641
  !MESSAGE 
  !STACK 0
  java.lang.NullPointerException
      at org.sonar.ide.eclipse.wsclient.internal.SonarWSClientFacade.getUnresolvedRemoteIssuesRecursively(SonarWSClientFacade.java:170)
      at org.sonar.ide.eclipse.core.internal.remote.RemoteSourceCode.getRemoteIssuesRecursively(RemoteSourceCode.java:107)
      at org.sonar.ide.eclipse.core.internal.jobs.SynchronizeAllIssuesJob.doRefreshIssues(SynchronizeAllIssuesJob.java:131)
      at org.sonar.ide.eclipse.core.internal.jobs.SynchronizeAllIssuesJob.fetchRemoteIssues(SynchronizeAllIssuesJob.java:120)
      at org.sonar.ide.eclipse.core.internal.jobs.SynchronizeAllIssuesJob.run(SynchronizeAllIssuesJob.java:76)
      at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
  </code></pre>
  
  <p>I would appreciate any help. Also I would like to know if there is a way to suppress my custom rule for some of the java file. I have seen the options like <code>//nosonar</code> and <code>@supress()</code>. Please let me know the way to suppress my custom rule for some java files.</p>