title: Deployment error:Starting of Tomcat failed, the server port 8080 is already in use
body: <p>When I run my Java project using Netbeans I get the following error:</p>
  
  <pre><code>Deployment error:
  Starting of Tomcat failed, the server port 8080 is already in use.
  See the server log for details.
          at org.netbeans.modules.j2ee.deployment.devmodules.api.Deployment.deploy(Deployment.java:166)
          at org.netbeans.modules.j2ee.ant.Deploy.execute(Deploy.java:104)
          at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
          at sun.reflect.GeneratedMethodAccessor619.invoke(Unknown Source)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
          at java.lang.reflect.Method.invoke(Method.java:597)
          at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:105)
          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:1329)
          at org.apache.tools.ant.Project.executeTarget(Project.java:1298)
          at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
          at org.apache.tools.ant.Project.executeTargets(Project.java:1181)
          at org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:277)
          at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:460)
          at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:151)
  Caused by: org.netbeans.modules.j2ee.deployment.impl.ServerException: Starting of Tomcat failed, the server port 8080 is already in use.
          at org.netbeans.modules.j2ee.deployment.impl.ServerInstance._start(ServerInstance.java:1297)
          at org.netbeans.modules.j2ee.deployment.impl.ServerInstance.startTarget(ServerInstance.java:1251)
          at org.netbeans.modules.j2ee.deployment.impl.ServerInstance.startTarget(ServerInstance.java:1062)
          at org.netbeans.modules.j2ee.deployment.impl.ServerInstance.start(ServerInstance.java:939)
          at org.netbeans.modules.j2ee.deployment.impl.TargetServer.startTargets(TargetServer.java:428)
          at org.netbeans.modules.j2ee.deployment.devmodules.api.Deployment.deploy(Deployment.java:143)
          ... 16 more
  BUILD FAILED (total time: 4 seconds)
  </code></pre>
  
  <p>I tried changing the server port to 8081 and shutdown port in tool->server. It runs fine but again if I do any operations and run the project it says "<strong>Deployment error:Starting of Tomcat failed, the server port 8081 is already in use</strong>"</p>
  
  <p>What would be the problem?</p>