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From "Gary Gregory (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (JXPATH-166) JXPathContextReferenceImpl.addNodePointerFactory not working anymore
Date Tue, 04 Feb 2014 16:42:09 GMT

     [ https://issues.apache.org/jira/browse/JXPATH-166?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gary Gregory resolved JXPATH-166.
---------------------------------

       Resolution: Fixed
    Fix Version/s: Nightly Builds
                   1.4
         Assignee: Gary Gregory

{noformat}
revert -N C:/vcs/svn/apache/commons/trunks-proper/jxpath/src/java/org/apache/commons/jxpath/JXPathContext.java
    Reverted C:/vcs/svn/apache/commons/trunks-proper/jxpath/src/java/org/apache/commons/jxpath/JXPathContext.java
diff --summarize --depth=infinity --ignoreAncestry -r 1523175:1523033 https://svn.apache.org/repos/asf/commons/proper/jxpath/trunk
merge --depth=infinity -r1523175:1523174 https://svn.apache.org/repos/asf/commons/proper/jxpath/trunk
C:/vcs/svn/apache/commons/trunks-proper/jxpath
    --- Reverse-merging r1523175 through r1523174 into C:/vcs/svn/apache/commons/trunks-proper/jxpath
    U   C:/vcs/svn/apache/commons/trunks-proper/jxpath/src/java/org/apache/commons/jxpath/JXPathContext.java
    Merge info recorded for C:/vcs/svn/apache/commons/trunks-proper/jxpath
     U  C:/vcs/svn/apache/commons/trunks-proper/jxpath
    Merge complete.
    ===== File Statistics: =====
    Updated: 1
    ==== Property Statistics: =====
    Updated: 2
{noformat}

> JXPathContextReferenceImpl.addNodePointerFactory not working anymore
> --------------------------------------------------------------------
>
>                 Key: JXPATH-166
>                 URL: https://issues.apache.org/jira/browse/JXPATH-166
>             Project: Commons JXPath
>          Issue Type: Bug
>    Affects Versions: Nightly Builds
>            Reporter: Michele Vivoda
>            Assignee: Gary Gregory
>             Fix For: 1.4, Nightly Builds
>
>   Original Estimate: 5m
>  Remaining Estimate: 5m
>
> I tried the following in a single test run in isolation:
> {{JXPathContextReferenceImpl.addNodePointerFactory(new ContainerPointerFactory());}}
> and got ExceptionInInitializer, I see a refactoring for  JXPathContext done by [~ggregory]
in last (recent) revision 1523175. Reverting to previous 1234255 fixes the issue. 
> The refactoring contains some static-init code in JXPathContext  that creates an instance
of a subclass of JXPathContext itself... seems to trigger one of the rare occasions in which
a static final field might be null, as happens then in a JXPathContextReferenceImpl constructor
where final field {{nodeFactories}} is null. My understanding is this: a call to any static
method of {{JXPathContextReferenceImpl}} triggers load of {{JXPathContext}} class that executes
static initialization code that creates a new {{JXPathContext}} that in turn is an other {{JXPathContextReferenceImpl}}
with static final field null since the static initializer of its super class must still terminate.
See something similar in http://stackoverflow.com/a/2547638/1536382 and http://stackoverflow.com/questions/2547713/why-static-fields-are-not-initialized-in-time
> My fix is either to restore the volatile lazy initializaton just for {{compilationContext}}
or, perhaps (not sure), just create a new context each time in the {{compile(xpath)}} static
method.
> {noformat}
> java.lang.ExceptionInInitializerError
> 	at org.apache.commons.jxpath.ri.AddNodePointerFactoryTest.testAddFactory(AddNodePointerFactoryTest.java:32)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:606)
> 	at junit.framework.TestCase.runTest(TestCase.java:154)
> 	at junit.framework.TestCase.runBare(TestCase.java:127)
> 	at junit.framework.TestResult$1.protect(TestResult.java:106)
> 	at junit.framework.TestResult.runProtected(TestResult.java:124)
> 	at junit.framework.TestResult.run(TestResult.java:109)
> 	at junit.framework.TestCase.run(TestCase.java:118)
> 	at junit.framework.TestSuite.runTest(TestSuite.java:208)
> 	at junit.framework.TestSuite.run(TestSuite.java:203)
> 	at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
> 	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
> 	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
> 	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
> 	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
> 	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
> Caused by: java.lang.NullPointerException
> 	at org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.<init>(JXPathContextReferenceImpl.java:191)
> 	at org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.<init>(JXPathContextReferenceImpl.java:178)
> 	at org.apache.commons.jxpath.ri.JXPathContextFactoryReferenceImpl.newContext(JXPathContextFactoryReferenceImpl.java:39)
> 	at org.apache.commons.jxpath.JXPathContext.newContext(JXPathContext.java:425)
> 	at org.apache.commons.jxpath.JXPathContext.<clinit>(JXPathContext.java:389)
> 	... 19 more
> {noformat}



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