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

[ivan mckinley (JIRA)]

ivan mckinley created RTGOV-644:
-----------------------------------

             Summary: 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
    Affects Versions: 1.0.0.M1
            Reporter: ivan mckinley
            Assignee: Gary Brown


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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