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From "Dmitri Blinov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JEXL-246) Intermittent ambiguous method invocation when processing assignOverload
Date Fri, 29 Dec 2017 13:39:00 GMT
Dmitri Blinov created JEXL-246:
----------------------------------

             Summary: 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
            Priority: Minor


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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