On Mar 14, 2013, at 2:56 PM, Nick Williams wrote:
> Using a variety of tutorials I found online and the documentation for
> o.a.c.startup.Tomcat, I created the following main method to start up an
> embedded Tomcat. I'm using 7.0.37 Tomcat JARs.
>
> public static void main(String... arguments) throws Exception
> {
> Tomcat tomcat = new Tomcat();
> tomcat.setBaseDir(".basedir");
> tomcat.setPort(8973);
> tomcat.enableNaming();
> tomcat.init();
> tomcat.start();
>
> System.out.println("X: " +
> tomcat.getConnector().getService().getContainer());
>
> tomcat.getServer().await();
> }
>
> The System.out.println is for debugging purposes, because I'm getting a
> NullPointerException. Obviously I'm doing something wrong, because about an
> hour of Googling turned up precisely zero results of anyone who's getting a
> NullPointerException in MapperListener#findDefaultHost. For some reason, it
> looks like a Container is never created. What gives? Here's the full output
> of running the JAR file:
>
> Mar 14, 2013 2:39:04 PM org.apache.coyote.AbstractProtocol init
> INFO: Initializing ProtocolHandler ["http-bio-8973"]
> Mar 14, 2013 2:39:04 PM org.apache.catalina.core.StandardService startInternal
> INFO: Starting service Tomcat
> Mar 14, 2013 2:39:04 PM org.apache.coyote.AbstractProtocol start
> INFO: Starting ProtocolHandler ["http-bio-8973"]
> Mar 14, 2013 2:39:04 PM org.apache.catalina.core.StandardService startInternal
> SEVERE: Failed to start connector [Connector[HTTP/1.1-8973]]
> org.apache.catalina.LifecycleException: Failed to start component
> [Connector[HTTP/1.1-8973]]
> at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
> at
> org.apache.catalina.core.StandardService.startInternal(StandardService.java:459)
> at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
> at
> org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:732)
> at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
> at org.apache.catalina.startup.Tomcat.start(Tomcat.java:335)
> at com.ul.Bootstrap.main(Bootstrap.java:15)
> Caused by: org.apache.catalina.LifecycleException: Failed to start component
> [org.apache.catalina.connector.MapperListener@768debd]
> at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
> at
> org.apache.catalina.connector.Connector.startInternal(Connector.java:1022)
> at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
> ... 6 more
> Caused by: java.lang.NullPointerException
> at
> org.apache.catalina.connector.MapperListener.findDefaultHost(MapperListener.java:252)
> at
> org.apache.catalina.connector.MapperListener.startInternal(MapperListener.java:104)
> at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
> ... 8 more
>
> X: null
I resolved the NullPointerException by calling
tomcat.getService().setContainer(tomcat.getEngine()) between init() and
start(). Everything is working fine now, and I can go to
http://localhost:8973/MyServlet and it's working great, but I still suspect I'm
doing something wrong, since no documentation or tutorials anywhere mention
needing to do that and it seems that the container should automatically be set
on the service...
I'm open to suggestions if anybody has any, but at least it's working now.
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