commons-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Dmitri Blinov (JIRA)" <>
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
             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$AmbiguousException}}
with the following stack trace: 
ambiguous method invocation: MyArithmetic.selfAdd(null, java.lang.Integer)
org.apache.commons.jexl3.internal.introspection.MethodKey$AmbiguousException: null
	at org.apache.commons.jexl3.internal.introspection.MethodKey$Parameters.getMostSpecific(
	at org.apache.commons.jexl3.internal.introspection.MethodKey$Parameters.access$000(
	at org.apache.commons.jexl3.internal.introspection.MethodKey.getMostSpecificMethod(
	at org.apache.commons.jexl3.internal.introspection.ClassMap.getMethod(

	at org.apache.commons.jexl3.internal.introspection.Introspector.getMethod(
	at org.apache.commons.jexl3.internal.introspection.Uberspect.getMethod(

	at MyUberspect.getMethod(
	at org.apache.commons.jexl3.internal.introspection.Uberspect$ArithmeticUberspect.getOperator(
	at org.apache.commons.jexl3.internal.Operators.tryOverload( 
	at org.apache.commons.jexl3.internal.Operators.tryAssignOverload( 
	at org.apache.commons.jexl3.internal.Interpreter.executeAssign( 
	at org.apache.commons.jexl3.internal.Interpreter.visit( 

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.

This message was sent by Atlassian JIRA

View raw message