Deployment error:Starting of Tomcat failed, the server port 8080 is already in use

Question

When I run my Java project using Netbeans I get the following error:

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) 

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 "Deployment error:Starting of Tomcat failed, the server port 8081 is already in use"

What would be the problem?

Answer 1

goto command prompt

netstat -aon 

for linux

netstat -tulpn | grep 'your_port_number' 

it will show you something like

 TCP    192.1.200.48:2053      24.43.246.60:443       ESTABLISHED     248  TCP    192.1.200.48:2055      24.43.246.60:443       ESTABLISHED     248  TCP    192.1.200.48:2126      213.146.189.201:12350  ESTABLISHED     1308  TCP    192.1.200.48:3918      192.1.200.2:8073       ESTABLISHED     1504  TCP    192.1.200.48:3975      192.1.200.11:49892     TIME_WAIT       0  TCP    192.1.200.48:3976      192.1.200.11:49892     TIME_WAIT       0  TCP    192.1.200.48:4039      209.85.153.100:80      ESTABLISHED     248  TCP    192.1.200.48:8080      209.85.153.100:80      ESTABLISHED     248 

check which process has binded your port. here in above example its 248 now if you are sure that you need to kill that process fire

Linux:

kill -9 248 

Windows:

taskkill /f /pid 248 

it will kill that process

Answer 2

If you are behind a proxy server this issue could happen i had the same issue and was solved by: Preferences -> General -> Proxy Settings -> No Proxy.

"Maybe the tomcat ready-message was sent to the proxy - and never reached the IDE."

found @: https://netbeans.org/bugzilla/show_bug.cgi?id=231220