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From "Matteo Trotta (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (JEXL-125) Unable to invoke method with ObjectContext
Date Mon, 16 Jan 2012 09:43:40 GMT

    [ https://issues.apache.org/jira/browse/JEXL-125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13186812#comment-13186812
] 

Matteo Trotta commented on JEXL-125:
------------------------------------

Ok, at the moment I can use the solution proposed by Maurizio in Example 1 as workaround.

Perhaps this is more a feature request than a bug, but why not make ObjectContext already
implement NamespaceResolver as in the example you proposed?

Then there would be no need to extend ObjectContext and access a protected variable, ObjectContext
would do all the job.

Thank you very much
                
> Unable to invoke method with ObjectContext
> ------------------------------------------
>
>                 Key: JEXL-125
>                 URL: https://issues.apache.org/jira/browse/JEXL-125
>             Project: Commons JEXL
>          Issue Type: Bug
>    Affects Versions: 2.1.1
>         Environment: Java 1.6.0_20 on Windows 7
>            Reporter: Matteo Trotta
>            Assignee: Henri Biestro
>
> Hi, I'm trying to invoke a method on Object context but I can't get it to work.
> I don't know if it's a bug or I'm doing it wrong.
> Here it is the code I'm using:
> {code:title=JexlTest.java}
> package it.test;
> import org.apache.commons.jexl2.Expression;
> import org.apache.commons.jexl2.JexlContext;
> import org.apache.commons.jexl2.JexlEngine;
> import org.apache.commons.jexl2.ObjectContext;
> import org.junit.Test;
> public class JexlTest {
>     public static class Foo {
>         public String method() {
>             return "OK";
>         }
>     }
>     @Test
>     public void test() throws Exception {
>         JexlEngine jexl = new JexlEngine();
>         jexl.setStrict(true);
>         Expression e = jexl.createExpression("method()");
>         JexlContext jc = new ObjectContext<Foo>(jexl, new Foo());
>         System.out.println(e.evaluate(jc));
>     }
> }
> {code}
> Here is the exception I'm getting:
> {noformat}
> org.apache.commons.jexl2.JexlException: it.test.JexlTest.test@19![0,8]: 'method();' method
error
> 	at org.apache.commons.jexl2.Interpreter.call(Interpreter.java:1078)
> 	at org.apache.commons.jexl2.Interpreter.visit(Interpreter.java:1100)
> 	at org.apache.commons.jexl2.parser.ASTMethodNode.jjtAccept(ASTMethodNode.java:18)
> 	at org.apache.commons.jexl2.Interpreter.visit(Interpreter.java:1317)
> 	at org.apache.commons.jexl2.parser.ASTReference.jjtAccept(ASTReference.java:18)
> 	at org.apache.commons.jexl2.Interpreter.interpret(Interpreter.java:232)
> 	at org.apache.commons.jexl2.ExpressionImpl.evaluate(ExpressionImpl.java:65)
> 	at it.test.JexlTest.test(JexlTest.java:21)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
> 	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
> 	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
> 	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
> 	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:274)
> 	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
> 	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:48)
> 	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:242)
> 	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:58)
> 	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:240)
> 	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:48)
> 	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:233)
> 	at org.junit.runners.ParentRunner.run(ParentRunner.java:303)
> 	at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
> 	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:71)
> 	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:202)
> 	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:63)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> 	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
> Caused by: org.apache.commons.jexl2.JexlException$Property: org.apache.commons.jexl2.ObjectContext.get@42![0,9]:
'#0.method;' inaccessible or unknown property #0
> 	at org.apache.commons.jexl2.Interpreter.visit(Interpreter.java:1341)
> 	at org.apache.commons.jexl2.parser.ASTReference.jjtAccept(ASTReference.java:18)
> 	at org.apache.commons.jexl2.JexlEngine.getProperty(JexlEngine.java:615)
> 	at org.apache.commons.jexl2.JexlEngine.getProperty(JexlEngine.java:587)
> 	at org.apache.commons.jexl2.ObjectContext.get(ObjectContext.java:42)
> 	at org.apache.commons.jexl2.Interpreter.call(Interpreter.java:1047)
> {noformat}
> Using a MapContext with variable "foo" set to 'new Foo()' and the expression "foo.method()"
gives no error.
> Anyway for my use it's more practical a ObjectContext, as I have only one object in the
context.
> Thank you for very much and keep up the excellent work!
> Matteo Trotta

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