title: SonarQube with Jenkins Error :Fail to download libraries from server
body: <p>I have updated Sonar to version 7.9.2 and now while trying to give build through Jenkins getting below error. </p>
  
  <pre><code>BUILD FAILED
  org.sonar.runner.impl.RunnerException: Unable to execute SonarQube
          at org.sonar.runner.impl.IsolatedLauncherFactory$1.run(IsolatedLauncherFactory.java:100)
          at org.sonar.runner.impl.IsolatedLauncherFactory$1.run(IsolatedLauncherFactory.java:87)
          at java.security.AccessController.doPrivileged(Native Method)
          at org.sonar.runner.impl.IsolatedLauncherFactory.createLauncher(IsolatedLauncherFactory.java:87)
          at org.sonar.runner.impl.IsolatedLauncherFactory.createLauncher(IsolatedLauncherFactory.java:83)
          at org.sonar.runner.api.EmbeddedRunner.doStart(EmbeddedRunner.java:249)
          at org.sonar.runner.api.EmbeddedRunner.start(EmbeddedRunner.java:187)
          at org.sonar.runner.api.EmbeddedRunner.start(EmbeddedRunner.java:182)
          at org.sonarsource.scanner.ant.SonarQubeTask.launchAnalysis(SonarQubeTask.java:66)
          at org.sonarsource.scanner.ant.SonarQubeTask.execute(SonarQubeTask.java:55)
          at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
          at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
          at java.lang.reflect.Method.invoke(Method.java:606)
          at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
          at org.apache.tools.ant.Task.perform(Task.java:348)
          at org.apache.tools.ant.Target.execute(Target.java:357)
          at org.apache.tools.ant.Target.performTasks(Target.java:385)
          at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
          at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
          at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
          at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
          at org.apache.tools.ant.Main.runBuild(Main.java:758)
          at org.apache.tools.ant.Main.startAnt(Main.java:217)
          at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)
          at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)
  Caused by: java.lang.IllegalStateException: Fail to download libraries from server
          at org.sonar.runner.impl.Jars.downloadFiles(Jars.java:93)
          at org.sonar.runner.impl.Jars.download(Jars.java:70)
          at org.sonar.runner.impl.JarDownloader.download(JarDownloader.java:40)
          at org.sonar.runner.impl.IsolatedLauncherFactory$1.run(IsolatedLauncherFactory.java:91)
          ... 25 more
  Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
          at org.sonar.runner.impl.Jars.downloadFiles(Jars.java:87)
          ... 28 more
  
  </code></pre>
  
  <p>Not able to understand which libraries are not getting downloaded.
  Other Details
  Apache Ant version 1.7.1
  SonarQube Ant Task version: 2.4
  sonarqube-7.9.2</p>
  
  <p><strong>Also want to update that the default java version is 1.7.80 which is used to compile the source code whereas for running sonarqube java 11 is being used.</strong></p>
  
  <p>Please suggest.</p>
  
  <p>Let me know in case any additional details are required.</p>