Not able to start Sonar Server

If you had already started Sonar and killed the process on command prompt, your JVM would still be running in the background.

Kill the java process and try again, it works. Tried and worked for me.

I got the solution from sonar log files itself. You can find server start up logs in the sonar.log file under directory "sonarqube-4.5\logs".

I was not able to start the server due to following port binding exception :

2015.07.29 02:46:36 ERROR web[o.a.c.h.Http11Protocol]  Failed to initialize end point associated with ProtocolHandler ["http-bio-0.0.0.0-9000"]
java.net.BindException: Address already in use: JVM_Bind /0.0.0.0:9000
    at org.apache.tomcat.util.net.JIoEndpoint.bind(JIoEndpoint.java:411) ~[tomcat-embed-core-7.0.54.jar:7.0.54]
    at org.apache.tomcat.util.net.AbstractEndpoint.init(AbstractEndpoint.java:640) ~[tomcat-embed-core-7.0.54.jar:7.0.54]
    at org.apache.coyote.AbstractProtocol.init(AbstractProtocol.java:434) ~[tomcat-embed-core-7.0.54.jar:7.0.54]
    at org.apache.coyote.http11.AbstractHttp11JsseProtocol.init(AbstractHttp11JsseProtocol.java:119) [tomcat-embed-core-7.0.54.jar:7.0.54]

So, I changed the port number to "4950" from "9000" in sonar.properties file under directory "sonarqube-4.5\conf".

# TCP port for incoming HTTP connections. Disabled when value is -1.
sonar.web.port=4950

# TCP port for incoming HTTPS connections. Disabled when value is -1 (default).
#sonar.web.https.port=-1

The server got successfully started after changing the port number.