Application InstanceManager is null causing crash with RestEasy Provider

[awmurray]

I've been debugging a startup error deploying a WAR in an EAR.

After downloading the source and debugging, I can see that the Instance
Manager is null
which causes line 108 to NullPointerException out.

org.apache.catalina.core.ApplicationFilterConfig.java from catalina.jar. The
version is Tomcat 8.0.5:

108: getInstanceManager().newInstance(filter);


341:    private InstanceManager getInstanceManager() {
342:        if (instanceManager == null) {
343:            if (context instanceof StandardContext) { 
344:                instanceManager =
((StandardContext)context).getInstanceManager(); // <----- THIS RETURNS NULL
345:            } else {
346:                instanceManager = new DefaultInstanceManager(null,
347:                        new HashMap<String, Map&lt;String, String>>(),
348:                        context,
349:                        getClass().getClassLoader());
350:            }
350:        }
352:        return instanceManager;
353:    }

Why would Instance Manager be null?  Must be a configuration problem?

Application Background:
=======================
I have this in tomee/apps/myappEAR/webModuleOne/WEB-INF/web/xml: 

    <display-name>webModuleOne</display-name> 
    <context-param> 
      <param-name>resteasy.providers</param-name> 
      <param-value>com.widgets.CustomThrowableMapper</param-value> 
    </context-param> 
    <context-param> 
      <param-name>resteasy.resources</param-name> 
      <param-value> 
        [a comma separated list of classes omitted] 
      </param-value> 
    </context-param> 

The exception is can't find com.widgets.CustomThrowableMapper: 

 java.lang.ClassNotFoundException: com.widgets.CustomThrowableMapper 
        at 
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1285)
 
        at 
org.apache.tomee.catalina.TomEEWebappClassLoader.loadWithDelegate(TomEEWebappClassLoader.java:211)
 
        at 
org.apache.tomee.catalina.TomEEWebappClassLoader.loadClass(TomEEWebappClassLoader.java:201)
 
        at 

The root cause is:
Caused by: java.lang.NullPointerException
        at
org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)
        ... 29 more




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