[
https://issues.apache.org/jira/browse/JXPATH-166?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Michele Vivoda updated JXPATH-166:
----------------------------------
Description:
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 better, 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}
was:
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 to restore the volatile lazy initializaton just for
{{compilationContext}}.
{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}
> 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: 1.4
> Reporter: Michele Vivoda
> 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 better, 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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