https://issues.apache.org/bugzilla/show_bug.cgi?id=45591
Summary: NullPointerException during shutdown in JKMain.pause()
Product: Tomcat 5
Version: 5.5.20
Platform: PC
OS/Version: Windows XP
Status: NEW
Severity: normal
Priority: P2
Component: Connector:AJP
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [EMAIL PROTECTED]
On startup, if Tomcat discovers that the main port is already bound to another
process, it fails and tries to execute the shutdown code. In some situations
(I'm not sure which), the org.apache.jk.server.JKMain instance variable wEnv is
null at this point, which causes a NullPointerException when JKMain.pause() is
called (see stacktrace below). Since this is occurring within a shutdown hook
thread, it can result in a dirty shutdown of the JVM. I've observed this with
Tomcat 5.5.20, but I looked over the code in 5.5.26 and it looks like the same
problem is still present.
Fortunately, the solution is very simple. Just add the following if test at
the beginning of JKMain.pause():
if (wEnv == null) {
return;
}
Stacktrace:
SEVERE: StandardServer.await: create[8006]:
java.net.BindException: Address already in use: JVM_Bind
at java.net.PlainSocketImpl.socketBind(Native Method)
at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:359)
at java.net.ServerSocket.bind(ServerSocket.java:319)
at java.net.ServerSocket.<init>(ServerSocket.java:185)
at
org.apache.catalina.core.StandardServer.await(StandardServer.java:372)
at org.apache.catalina.startup.Catalina.await(Catalina.java:615)
at org.apache.catalina.startup.Catalina.start(Catalina.java:575)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)
Aug 7, 2008 3:25:34 PM org.apache.coyote.http11.Http11BaseProtocol pause
INFO: Pausing Coyote HTTP/1.1 on http-8000
Aug 7, 2008 3:25:34 PM org.apache.catalina.connector.Connector pause
SEVERE: Protocol handler pause failed
java.lang.NullPointerException
at org.apache.jk.server.JkMain.pause(JkMain.java:678)
at org.apache.jk.server.JkCoyoteHandler.pause(JkCoyoteHandler.java:162)
at org.apache.catalina.connector.Connector.pause(Connector.java:1031)
at
org.apache.catalina.core.StandardService.stop(StandardService.java:491)
at
org.apache.catalina.core.StandardServer.stop(StandardServer.java:743)
at org.apache.catalina.startup.Catalina.stop(Catalina.java:601)
at
org.apache.catalina.startup.Catalina$CatalinaShutdownHook.run(Catalina.java:644)
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