2013/3/15 Nick Williams <nicho...@nicholaswilliams.net>:
>
> 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:
Why do you expect that default "Host" exist, if you have not created
one, nor asked for one, nor deployed a web application, all of them
auto-create it if it is missing.
There may be different implementations of a Host. It needs
configuration (name). Thus initially there is none created.
Calling tomcat.getHost() should be enough.
Note, that Tomcat needs a default web application (aka context with
path "", aka ROOT) for certain features (error reporting) to work
properly.
>>
>> 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...
There are a number of working examples in the testsuite.
Best regards,
Konstantin Kolinko
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