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https://issues.apache.org/jira/browse/FALCON-2050?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Balu Vellanki updated FALCON-2050:
----------------------------------
Fix Version/s: 0.10
trunk
> 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
> Fix For: trunk, 0.10
>
> Attachments: FALCON-2050.patch
>
>
> 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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