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.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
