Bug 50252

Created attachment 26281 [details]
patch for NamingContext.java

If context.xml contains <ResourceLink>, ClassCastException occurs as follows.

java.lang.ClassCastException: org.apache.naming.ResourceLinkRef cannot be cast to org.apache.naming.ResourceRef
        at org.apache.naming.NamingContext.lookup(NamingContext.java:828)
        at org.apache.naming.NamingContext.lookup(NamingContext.java:145)
        at org.apache.naming.NamingContext.lookup(NamingContext.java:814)
        at org.apache.naming.NamingContext.lookup(NamingContext.java:159)
        at org.apache.catalina.core.DefaultInstanceManager.lookupFieldResource(DefaultInstanceManager.java:460)
        at org.apache.catalina.core.DefaultInstanceManager.processAnnotations(DefaultInstanceManager.java:299)
        at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:137)
        at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:119)
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1046)
        at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:797)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:108)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:558)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:379)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:242)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:259)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:237)
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:281)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)

This issue is relating to the following issue.
https://issues.apache.org/bugzilla/show_bug.cgi?id=50159

I attached the patch for this issue.
Regards.