[overlord-issues] [JBoss JIRA] (RTGOV-644) Enable MVELExpressionEvaluator to evaluate more complex scripts (with Variables)

[Gary Brown (JIRA)]

     [ https://issues.jboss.org/browse/RTGOV-644?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gary Brown updated RTGOV-644:
-----------------------------
    Affects Version/s:     (was: 1.0.0.M1)


> Enable MVELExpressionEvaluator to evaluate more complex scripts (with Variables)
> --------------------------------------------------------------------------------
>
>                 Key: RTGOV-644
>                 URL: https://issues.jboss.org/browse/RTGOV-644
>             Project: RTGov (Run Time Governance)
>          Issue Type: Feature Request
>          Components: Information Processor
>            Reporter: ivan mckinley
>            Assignee: Gary Brown
>             Fix For: 2.1.0.Beta2
>
>
> if a user wishes to execute more complex mvel scripts with variables during information processing then MVEL fails with exception, {1}. 
> The following test case,2, demonstrates  this behaviour in action. 
> Recommendation is to update  line 44 
>  https://github.com/Governance/rtgov/blob/master/modules/activity-management/activity/src/main/java/org/overlord/rtgov/activity/processor/mvel/MVELExpressionEvaluator.java#L44
> Object result=MVEL.executeExpression(_compiledExpression, information, new HashMap());
> {1}Exception
> activity event: org.mvel2.ScriptRuntimeException: cannot assign variables; no variable resolver factory available.
>                 at org.mvel2.integration.impl.ImmutableDefaultFactory.throwError(ImmutableDefaultFactory.java:32)
>                 at org.mvel2.integration.impl.ImmutableDefaultFactory.createVariable(ImmutableDefaultFactory.java:36)
>                 at org.mvel2.integration.impl.ClassImportResolverFactory.createVariable(ClassImportResolverFactory.java:61)
>                 at org.mvel2.ast.TypedVarNode.getReducedValueAccelerated(TypedVarNode.java:70)
>                 at org.mvel2.MVELRuntime.execute(MVELRuntime.java:86)
>                 at org.mvel2.compiler.CompiledExpression.getDirectValue(CompiledExpression.java:123)
>                 at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:119)
>                 at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:113)
>                 at org.mvel2.MVEL.executeExpression(MVEL.java:954)
>                 at org.overlord.rtgov.activity.processor.mvel.MVELExpressionEvaluator.evaluate(MVELExpressionEvaluator.java:44)
>                 at org.overlord.rtgov.activity.processor.TypeProcessor$PropertyEvaluator.process(TypeProcessor.java:310)
>                 at org.overlord.rtgov.activity.processor.TypeProcessor.process(TypeProcessor.java:166)
>                 at org.overlord.rtgov.activity.processor.InformationProcessor.process(InformationProcessor.java:137)
>                 at org.overlord.rtgov.activity.processor.AbstractInformationProcessorManager.process(AbstractInformationProcessorManager.ja
> {2} Test Case 
> @Test
> public void testTransformDOM2() {
>     org.w3c.dom.Document doc=null;
>     try {
>         doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();
>         org.w3c.dom.Element elem=doc.createElement("test");
>         doc.appendChild(elem);
>         elem.appendChild(doc.createTextNode("This is a test"));
>     } catch (Exception e) {
>         fail("Failed to build DOM: "+e);
>     }
>     String expression = "import javax.xml.transform.TransformerFactory; import javax.xml.transform.Transformer; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import java.io.ByteArrayOutputStream; ByteArrayOutputStream out = new ByteArrayOutputStream(); DOMSource source = new DOMSource(this); StreamResult result = new StreamResult(out); TransformerFactory transFactory = TransformerFactory.newInstance(); Transformer transformer = transFactory.newTransformer(); transformer.transform(source, result); out.close(); return new String(out.toByteArray());";
>      Object _compiledExpression=null;
>     _compiledExpression = MVEL.compileExpression(expression);
>     Object result=MVEL.executeExpression(_compiledExpression, doc);
>     if (result == null) {
>         fail("Failed to parse");
>     }
>     System.out.println(result);



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