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https://issues.apache.org/jira/browse/JEXL-246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16316464#comment-16316464
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Henri Biestro edited comment on JEXL-246 at 1/8/18 3:17 PM:
------------------------------------------------------------
The behavior is not intermittent; when JEXL detects an ambiguity when resolving
a method, it will log this exception as an info (using the JEXL engine logger
if configured to allow these) and will remember this signature as a cache-miss.
The second time this resolution is attempted, the cache-miss will be detected
to return a null (and avoid throwing the same exception twice).
In effect, the MethodKey.AmbiguousException will only be logged once (per
lifetime of the Introspector).
The fix makes it clearer to determine what the error is due to; in the
accompanying case, it is due to a null operand (z) during operator evaluation.
trunk/RELEASE-NOTES.txt
trunk/src/main/java/org/apache/commons/jexl3/internal/Operators.java
trunk/src/site/xdoc/changes.xml
trunk/src/test/java/org/apache/commons/jexl3/IssuesTest200.java
Committed revision 1820568.
was (Author: henrib):
The behavior is not intermittent; when JEXL detects an ambiguity when resolving
a method, it will log this exception as an info (using the JEXL engine logger
if configured to allow these) and will remember this signature as a cache-miss.
The second time this resolution is attempted, the cache-miss will be detected
to return a null (and avoid throwing the same exception twice).
In effect, the MethodKey.AmbiguousException will only be logged once (per
lifetime of the Introspector).
The fix though is to make it clearer what the error is due to; in the
accompanying case, it is due to a null operand (z) during operator evaluation.
trunk/RELEASE-NOTES.txt
trunk/src/main/java/org/apache/commons/jexl3/internal/Operators.java
trunk/src/site/xdoc/changes.xml
trunk/src/test/java/org/apache/commons/jexl3/IssuesTest200.java
Committed revision 1820568.
> Intermittent ambiguous method invocation when processing assignOverload
> -----------------------------------------------------------------------
>
> Key: JEXL-246
> URL: https://issues.apache.org/jira/browse/JEXL-246
> Project: Commons JEXL
> Issue Type: Bug
> Affects Versions: 3.1
> Reporter: Dmitri Blinov
> Assignee: Henri Biestro
> Priority: Minor
> Fix For: 3.2
>
>
> Sometimes the simple operator like {code}z += 1{code} when {{z}} has not been
> defined yet raises an exception
> {{org.apache.commons.jexl3.internal.introspection.MethodKey$AmbiguousException}}
> with the following stack trace:
> {quote}
> ambiguous method invocation: MyArithmetic.selfAdd(null, java.lang.Integer)
> org.apache.commons.jexl3.internal.introspection.MethodKey$AmbiguousException:
> null
> at
> org.apache.commons.jexl3.internal.introspection.MethodKey$Parameters.getMostSpecific(MethodKey.java:540)
> at
> org.apache.commons.jexl3.internal.introspection.MethodKey$Parameters.access$000(MethodKey.java:452)
> at
> org.apache.commons.jexl3.internal.introspection.MethodKey.getMostSpecificMethod(MethodKey.java:261)
> at
> org.apache.commons.jexl3.internal.introspection.ClassMap.getMethod(ClassMap.java:178)
>
> at
> org.apache.commons.jexl3.internal.introspection.Introspector.getMethod(Introspector.java:146)
> at
> org.apache.commons.jexl3.internal.introspection.MethodExecutor.discover(MethodExecutor.java:52)
> at
> org.apache.commons.jexl3.internal.introspection.Uberspect.getMethod(Uberspect.java:218)
>
> at MyUberspect.getMethod(MyUberspect.java:168)
> at
> org.apache.commons.jexl3.internal.introspection.Uberspect$ArithmeticUberspect.getOperator(Uberspect.java:413)
> at
> org.apache.commons.jexl3.internal.Operators.tryOverload(Operators.java:85)
> at
> org.apache.commons.jexl3.internal.Operators.tryAssignOverload(Operators.java:118)
>
> at
> org.apache.commons.jexl3.internal.Interpreter.executeAssign(Interpreter.java:1292)
>
> at
> org.apache.commons.jexl3.internal.Interpreter.visit(Interpreter.java:1102)
> ....
> {quote}
> The class MyArithmetic contains a couple of overloaded
> {{public JexlOperator selfAdd(T x, Object y)}} methods with the first
> argument being the desired type {{T}} like {{Appendable}} or {{Collection}}
> for which the {{+=}} operator is overloaded.
> Obviously in case where the first argument is null and the second argument is
> an Integer it is not possible to differentiate between {{public JexlOperator
> selfAdd(Collection x, Object y)}} and {{public JexlOperator
> selfAdd(Appendable x, Object y)}} but I wonder is there any point in trying
> to perform {{selfAdd}} on the null variable? What questions me more is that
> this error is intermittent and sometimes there is an exception and sometimes
> there is not, so at the moment I have no test case to reproduce. So I think
> this is a bug.
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