[jira] [Created] (FALCON-2050) Configure jetty parent classloader to be prioritized over webapp classloader

["Venkat Ranganathan (JIRA)" <ji...@apache.org>]

Venkat Ranganathan created FALCON-2050:
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             Summary: Configure jetty parent classloader to be prioritized over webapp classloader
                 Key: FALCON-2050
                 URL: https://issues.apache.org/jira/browse/FALCON-2050
             Project: Falcon
          Issue Type: Bug
          Components: common
    Affects Versions: 0.10
            Reporter: Venkat Ranganathan
            Assignee: Venkat Ranganathan


FALCON-1942 allowed external libraries to be configured so that libraries like Atlas hook can be configured (which the Atlas code itself was part of the Atlas client installation).   Unfortunately, the FACLON_EXTRA_CLASSPATH only is available in the parent classloader and not via the webapp classloader causing stack trace like below to be thrown

To fix this, we need to enable the parent classloader to have priority over the webapp classloader.   When a class or resource is resolved, the parent classloader will be used and  then the child classloader.

Since all falcon jars are also in the parent path this should fix the issue with Atlas hook and similar scnearios.


{quote}
2016-06-24 14:50:47,022 ERROR - [main:] ~ Failed startup of context org.mortbay.jetty.webapp.WebAppContext@46e481d6{/,/usr/hdp/current/falcon-server/server/webapp/falcon} (log:87)
java.lang.ClassCastException: org.apache.falcon.atlas.service.AtlasService cannot be cast to org.apache.falcon.service.FalconService
	at org.apache.falcon.service.ServiceInitializer.initialize(ServiceInitializer.java:43)
	at org.apache.falcon.listener.ContextStartupListener.contextInitialized(ContextStartupListener.java:56)
	at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:550)
	at org.mortbay.jetty.servlet.Context.startContext(Context.java:136)
	at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1282)
	at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:519)
	at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:499)
	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
	at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
	at org.mortbay.jetty.Server.doStart(Server.java:224)
	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
	at org.apache.falcon.util.EmbeddedServer.start(EmbeddedServer.java:57)
	at org.apache.falcon.FalconServer.main(FalconServer.java:118)
{quote}



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