public void testMyInterceptors() { // Avoid MVEL OOM issue: http://jira.codehaus.org/browse/MVEL-252 // This also disables JIT compilre // At this time, MVEL does not support per instance configuration of the JIT due to performance constraints. OptimizerFactory.setDefaultOptimizer(OptimizerFactory.SAFE_REFLECTIVE); Interceptor testLeftInterceptor = new Interceptor() { public int doBefore(ASTNode node, VariableResolverFactory factory) { System.out.println("BEFORE left Node: " + node.getName()); System.out.println("BEFORE left Node: node.getClass(): " + node.getClass()); //node.setAsLiteral(); //node.setLiteralValue("Ivan"); System.out.println("BEFORE left Node: " + node.getLiteralValue()); node.setAccessor(new MetaDataAccessor()); return 0; } public int doAfter(Object val, ASTNode node, VariableResolverFactory factory) { System.out.println("AFTER left Node: " + node.getName()); System.out.println("AFTER left Node: node.getLiteralValue(): " + node.getLiteralValue()); return 0; } }; Interceptor testRightInterceptor = new Interceptor() { public int doBefore(ASTNode node, VariableResolverFactory factory) { System.out.println("BEFORE right Node: " + node.getName()); System.out.println("BEFORE right Node: node.getClass(): " + node.getClass()); return 0; } public int doAfter(Object val, ASTNode node, VariableResolverFactory factory) { System.out.println("AFTER right Node: " + node.getName()); return 0; } }; Map<String, Interceptor> interceptors = new HashMap<String, Interceptor>(); interceptors.put("testLeft", testLeftInterceptor); interceptors.put("testRight", testRightInterceptor); String expression = "(@testLeft emailMessage.from == @testRight 'Mark' || @testLeft myBean.var == 1)"; //compileExpression(expression, null, interceptors); Map<String, Object> contextObjects = new HashMap<String, Object>(); EmailMessage emailMessage = new EmailMessage(); emailMessage.setFrom("Mark"); contextObjects.put("emailMessage", emailMessage); MyBean myBean = new MyBean(); myBean.setVar(1); contextObjects.put("myBean", myBean); boolean evaluationResult = executeExpression(compileExpression(expression, null, interceptors), contextObjects, Boolean.class); System.out.println(evaluationResult); } public class MetaDataAccessor implements Accessor{ public Object getValue(Object ctx, Object elCtx, VariableResolverFactory variableFactory) { return null; //To change body of implemented methods use File | Settings | File Templates. } public Object setValue(Object ctx, Object elCtx, VariableResolverFactory variableFactory, Object value) { return null; //To change body of implemented methods use File | Settings | File Templates. } public Class getKnownEgressType() { return null; //To change body of implemented methods use File | Settings | File Templates. } } When the MetaDataAccessor's geValue was invoked, the ctx and elCtx were Null, however I am expecting the correct expression and context object presents? What is wrong with my codes? I would expect the value reduce process can be done by my accessor in some cases but apparently it is not. ----- Ivan, your Panda, forever -- View this message in context: http://drools.46999.n3.nabble.com/MVEL-Getting-Null-Context-Object-with-M... Sent from the Drools: User forum mailing list archive at Nabble.com.