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Posted to dev@falcon.apache.org by "Balu Vellanki (JIRA)" <ji...@apache.org> on 2016/07/01 18:11:11 UTC
[jira] [Resolved] (FALCON-2050) Configure jetty parent classloader
to be prioritized over webapp classloader
[ https://issues.apache.org/jira/browse/FALCON-2050?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Balu Vellanki resolved FALCON-2050.
-----------------------------------
Resolution: Fixed
Issue resolved by pull request 211
[https://github.com/apache/falcon/pull/211]
> 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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