It is possible to turn off the language constraint for MVEL in drools, see KnowledgeBuilderConfiguration, which should cause the static field not to be set.

Mark
On 21/07/2010 15:02, Edson Tirelli wrote:

    Hi Paul,

    Your analysis is correct. The problem is that these configurations in MVEL are made using static properties and so they affect all uses of MVEL in a single classloading hierarchy. Unfortunately, I don't think there is anything you can do right now, other than open a JIRA in MVEL to help convince Mike to make all configurations non-static in MVEL:

http://jira.codehaus.org/browse/MVEL

    Edson
    
2010/7/21 Paul Edwards <Paul.Edwards@hyro.com>
Hi guys,

I have an issue which involves smooks, drools and mvel.

Quick explanation, the unit test is just a smooks run. Nothing complicated. The test passes happily. It contains an expression that involves an MVEL "IF" statement.

Now if I add a drools startup (I'm not using drools in the test, I'm just initialising it), the unit test now fails on the "IF" statement. The exception received is:

org.milyn.cdr.SmooksConfigurationException: Error invoking @Initialize method 'initialize' on class 'org.milyn.javabean.BeanInstancePopulator'.
       at org.milyn.cdr.annotation.Configurator.invoke(Configurator.java:457)
       at org.milyn.cdr.annotation.Configurator.initialise(Configurator.java:439)
       at org.milyn.cdr.annotation.Configurator.configure(Configurator.java:91)
       at org.milyn.cdr.annotation.Configurator.configure(Configurator.java:66)
       at org.milyn.delivery.JavaContentHandlerFactory.create(JavaContentHandlerFactory.java:63)
       at org.milyn.delivery.ContentDeliveryConfigBuilder$ContentHandlerExtractionStrategy.addCDU(ContentDeliveryConfigBuilder.java:623)
       at org.milyn.delivery.ContentDeliveryConfigBuilder$ContentHandlerExtractionStrategy.applyCDUStrategy(ContentDeliveryConfigBuilder.java:548)
       at org.milyn.delivery.ContentDeliveryConfigBuilder$ContentHandlerExtractionStrategy.applyStrategy(ContentDeliveryConfigBuilder.java:536)
       at org.milyn.delivery.ContentDeliveryConfigBuilder$SmooksResourceConfigurationTableIterator.iterate(ContentDeliveryConfigBuilder.java:711)
       at org.milyn.delivery.ContentDeliveryConfigBuilder$SmooksResourceConfigurationTableIterator.access$300(ContentDeliveryConfigBuilder.java:690)
       at org.milyn.delivery.ContentDeliveryConfigBuilder.extractContentHandlers(ContentDeliveryConfigBuilder.java:484)
       at org.milyn.delivery.ContentDeliveryConfigBuilder.load(ContentDeliveryConfigBuilder.java:349)
       at org.milyn.delivery.ContentDeliveryConfigBuilder.getConfig(ContentDeliveryConfigBuilder.java:146)
       at org.milyn.container.standalone.StandaloneExecutionContext.<init>(StandaloneExecutionContext.java:91)
       at org.milyn.container.standalone.StandaloneExecutionContext.<init>(StandaloneExecutionContext.java:65)
       at org.milyn.Smooks.createExecutionContext(Smooks.java:383)
       at org.milyn.Smooks.createExecutionContext(Smooks.java:346)
       at com.hyro.telstrapoc.smooks.SmooksTransformTest.runSmooksTransform(SmooksTransformTest.java:215)
       at com.hyro.telstrapoc.smooks.SmooksTransformTest.testSmooks(SmooksTransformTest.java:139)
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
       at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
       at java.lang.reflect.Method.invoke(Method.java:597)
       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.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
       at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
       at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:73)
       at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:46)
       at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:180)
       at org.junit.runners.ParentRunner.access$000(ParentRunner.java:41)
       at org.junit.runners.ParentRunner$1.evaluate(ParentRunner.java:173)
       at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
       at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
       at org.junit.runners.ParentRunner.run(ParentRunner.java:220)
       at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
       at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
       at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
       at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
       at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
       at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: [Error: was expecting type: java.lang.Object; but found type: null]
[Near : {... }
               els ....}]
            ^
[Line: 3, Column: 16]
       at org.mvel2.util.CompilerTools.expectType(CompilerTools.java:355)
       at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer._getAccessor(ReflectiveAccessorOptimizer.java:1052)
       at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeCollection(ReflectiveAccessorOptimizer.java:1079)
       at org.mvel2.ast.InlineCollectionNode.<init>(InlineCollectionNode.java:50)
       at org.mvel2.compiler.AbstractParser.nextToken(AbstractParser.java:1173)
       at org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:118)
       at org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:65)
       at org.mvel2.MVEL.compileExpression(MVEL.java:886)
       at org.mvel2.MVEL.compileExpression(MVEL.java:891)
       at org.mvel2.MVEL.compileExpression(MVEL.java:797)
       at org.milyn.expression.MVELExpressionEvaluator.setExpression(MVELExpressionEvaluator.java:55)
       at org.milyn.javabean.BeanInstancePopulator.initialize(BeanInstancePopulator.java:235)
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
       at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
       at java.lang.reflect.Method.invoke(Method.java:597)
       at org.milyn.cdr.annotation.Configurator.invoke(Configurator.java:453)
       ... 42 more


If I remove the 3 lines initialising drools, it all passes again. I suspect that the MVEL engine is a singleton, and both drools and smooks are using the same instance. I believe drools is setting MVEL to disallow "IF" statements on the RHS of a rule. (see: http://drools-java-rules-engine.46999.n3.nabble.com/Trivial-rule-with-condition-in-RHS-won-t-compile-help-please-td67458.html) I don't understand why MVEL thinks that my smooks expression is a RHS of a rule....


Heres the unit test:
@Test
   public void testSmooks2() throws Exception {

       String input =
       "<ns5:user partyAdminRoles=\"\" lastName=\"Edwards\" firstName=\"Paul\" primary=\"false\" userID=\"pedwards\" otpTokenRemainingUses=\"0\" registrationCodeRemainingUses=\"0\" enabled=\"true\" customIntAttr1=\"0\" xmlns:ns2=\"urn:oasis:names:tc:SPML:2:0:reference\" xmlns=\"urn:oasis:names:tc:SPML:2:0\" xmlns:ns4=\"urn:oasis:names:tc:SPML:2:0:password\" xmlns:ns3=\"urn:oasis:names:tc:SPML:2:0:search\" xmlns:ns5=\"http://hyro.com/da/objectmodel\" xmlns:ns6=\"http://www.sifinfo.org/au/infrastructure/2.x\" xmlns:ns7=\"urn:oasis:names:tc:SPML:2:0:batch\">\n" +
       "    <ns5:emailAddresses emailAddress=\"pedwards@frazzle.co.nz\" primary=\"true\" type=\"Personal\" modificationMode=\"0\"/>\n" +
       "    <ns5:emailAddresses emailAddress=\"grumpy@frazzle.co.nz\" primary=\"false\" type=\"Personal\" modificationMode=\"0\"/>\n" +
       "    <ns5:authzRoleSubscriptions status=\"Active\" primary=\"false\" singlePasswordOptOut=\"false\" reprovision=\"false\" customBoolAttr5=\"false\" customBoolAttr4=\"false\" customBoolAttr3=\"false\" customBoolAttr2=\"false\" customBoolAttr1=\"false\" customIntAttr5=\"0\" customIntAttr4=\"0\" customIntAttr3=\"0\" customIntAttr2=\"0\" customIntAttr1=\"0\">\n" +
       "        <ns5:role roleName=\"Account\">\n" +
       "            <ns5:entitlement entitlementID=\"Open LDAP Account\" type=\"Account\"/>\n" +
       "        </ns5:role>\n" +
       "    </ns5:authzRoleSubscriptions>\n" +
       "    <ns5:auxEntities/>\n" +
       "</ns5:user>\n";

       UserType inUser = null;
       Unmarshaller unmarshaller = null;

       try {
           log.debug("Unmarshalling: " + input);
           unmarshaller = (Unmarshaller) SpmlConstants.unmarshallerPool.borrowObject();
           inUser = ((JAXBElement<UserType>) unmarshaller.unmarshal(new StringReader(input))).getValue();
       } catch (JAXBException e) {
           log.error("Exception while trying to unmarshall input daSpmlString: " + e.getMessage());
           e.printStackTrace();
           throw e;
       } catch (Exception e) {
           log.error("Exception while trying to unmarshall input daSpmlString: " + e.getMessage());
           e.printStackTrace();
           throw e;
       } finally {
           SpmlConstants.unmarshallerPool.returnObject(unmarshaller);
       }

       log.debug("Unmarshalled: " + inUser.getUserID());

       Properties parsed = runSmooksTransform(inUser);
       assertNotNull(parsed);


       for(Iterator<Object> i = parsed.keySet().iterator(); i.hasNext();) {
           Object key = i.next();
           Object value = parsed.get(key);
           System.out.println("Key: " + key + " value: " + value);
       }

   }

Heres the smooks file:

<?xml version="1.0"?>
<smooks-resource-list xmlns="http://www.milyn.org/xsd/smooks-1.1.xsd"
                     xmlns:core="http://www.milyn.org/xsd/smooks/smooks-core-1.3.xsd"
                     xmlns:jb="http://www.milyn.org/xsd/smooks/javabean-1.3.xsd">

   <!-- NOTE NOTE NOTE -->
   <!-- This is purely to map user or person props to the LDAP name. Anything that is handled -->
   <!-- explicitly (like firstname or lastname) does not get mapped -->

   <jb:bean beanId="UserOrPerson" class="java.util.Properties" createOnElement="com.hyro.spmlservice.generated.objectmodel.PersonType">

       <jb:value property="employeeNumber" decoder="String" data="personID" />
       <jb:value property="mobile" decoder="String" data="mobileTel" />
       <jb:value property="facsimileTelephoneNumber" decoder="String" data="workFax" />
       <jb:value property="telephoneNumber" decoder="String" data="workTel" />
       <jb:value property="description" decoder="String" data="title" />
       <jb:value property="l" decoder="String" data="customAttr27" />
       <jb:value property="physicalDeliveryOfficeName" decoder="String" data="customAttr8" />
       <jb:value property="postalCode" decoder="String" data="customAttr7" />

   </jb:bean>

   <jb:bean beanId="UserOrPerson" class="java.util.Properties" createOnElement="com.hyro.spmlservice.generated.objectmodel.UserType">
       <jb:value property="firstName" decoder="String" data="firstName" />
       <jb:value property="lastName" decoder="String" data="lastName" />
       <jb:value property="user" decoder="String" data="userID" />

       <jb:value property="displayName" decoder="String" data="customAttr4" />
       <jb:value property="postalCode" decoder="String" data="customAttr2" />

       <jb:expression property="mail" execOnElement="emailAddresses">

             if(1 == 2) {
               return emailAddresses[0].emailAddress;
             }
               else {
               return "NOT FOUND";
             }
       </jb:expression>


   </jb:bean>

   <jb:bean beanId="emailAddresses" class="java.util.ArrayList" createOnElement="emailAddresses">
       <jb:wiring beanIdRef="emailAddressType" />
   </jb:bean>

   <jb:bean beanId="emailAddressType" class="com.hyro.spmlservice.generated.objectmodel.EmailAddressType" createOnElement="com.hyro.spmlservice.generated.objectmodel.EmailAddressType">
       <jb:value property="modificationMode" decoder="Short" data="modificationMode" />
       <jb:value property="emailAddress" decoder="String" data="emailAddress" />
       <jb:value property="type" decoder="String" data="type" />
       <jb:value property="primary" decoder="Boolean" data="primary" />
   </jb:bean>


</smooks-resource-list>


Any Ideas? I've wasted 3 days getting to this point....
--
Paul Edwards

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--
  Edson Tirelli
  JBoss Drools Core Development
  JBoss by Red Hat @ www.jboss.com

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