Error with SimpleDateFormat generated by Guided Rule / Guided Decision Table in BRMS

Issue

• I get the following error in Realtime Decision Server / Intelligent Process Server

16:41:06,755 ERROR [org.kie.server.services.drools.DroolsKieContainerCommandServiceImpl] (http-127.0.0.1:8080-2) Error calling container 'example:date-test:1.0': Exception executing consequence for rule "Row 1 BirthDayDT" in example: [Error: could not create constructor: null]
[Near : {... ateFormat sdf = new java.text.SimpleDateFormat("nu ....}]
                                 ^
[Line: 1, Column: 38]
    at org.drools.core.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39) [drools-core-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    at org.drools.core.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1065) [drools-core-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    at org.drools.core.phreak.RuleExecutor.fire(RuleExecutor.java:121) [drools-core-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:74) [drools-core-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    at org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:972) [drools-core-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1315) [drools-core-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1254) [drools-core-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1365) [drools-core-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1356) [drools-core-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1337) [drools-core-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    at org.drools.core.command.runtime.rule.FireAllRulesCommand.execute(FireAllRulesCommand.java:111) [drools-core-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    at org.drools.core.command.runtime.rule.FireAllRulesCommand.execute(FireAllRulesCommand.java:36) [drools-core-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    at org.drools.core.command.runtime.BatchExecutionCommandImpl.execute(BatchExecutionCommandImpl.java:138) [drools-core-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    at org.drools.core.command.runtime.BatchExecutionCommandImpl.execute(BatchExecutionCommandImpl.java:51) [drools-core-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    at org.drools.core.impl.StatefulKnowledgeSessionImpl.execute(StatefulKnowledgeSessionImpl.java:747) [drools-core-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    at org.drools.core.impl.StatefulKnowledgeSessionImpl.execute(StatefulKnowledgeSessionImpl.java:721) [drools-core-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    at org.kie.server.services.drools.RulesExecutionService.call(RulesExecutionService.java:52) [kie-server-services-drools-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    at org.kie.server.services.drools.DroolsKieContainerCommandServiceImpl.callContainer(DroolsKieContainerCommandServiceImpl.java:69) [kie-server-services-drools-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    ...
Caused by: [Error: could not create constructor: null]
[Near : {... ateFormat sdf = new java.text.SimpleDateFormat("nu ....}]
                                 ^
[Line: 1, Column: 38]
    at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeObjectCreation(ReflectiveAccessorOptimizer.java:1245) [mvel2-2.2.8.Final-redhat-1.jar:]
    at org.mvel2.ast.NewObjectNode.getReducedValueAccelerated(NewObjectNode.java:218) [mvel2-2.2.8.Final-redhat-1.jar:]
    at org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:38) [mvel2-2.2.8.Final-redhat-1.jar:]
    at org.mvel2.ast.TypedVarNode.getReducedValueAccelerated(TypedVarNode.java:70) [mvel2-2.2.8.Final-redhat-1.jar:]
    at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85) [mvel2-2.2.8.Final-redhat-1.jar:]
    at org.mvel2.compiler.CompiledExpression.getDirectValue(CompiledExpression.java:123) [mvel2-2.2.8.Final-redhat-1.jar:]
    at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:119) [mvel2-2.2.8.Final-redhat-1.jar:]
    at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:113) [mvel2-2.2.8.Final-redhat-1.jar:]
    at org.mvel2.MVEL.executeExpression(MVEL.java:929) [mvel2-2.2.8.Final-redhat-1.jar:]
    at org.drools.core.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:110) [drools-core-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    at org.drools.core.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1054) [drools-core-6.5.0.Final-redhat-17.jar:6.5.0.Final-redhat-17]
    ... 46 more
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) [rt.jar:1.8.0_66]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) [rt.jar:1.8.0_66]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) [rt.jar:1.8.0_66]
    at java.lang.reflect.Constructor.newInstance(Constructor.java:422) [rt.jar:1.8.0_66]
    at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileConstructor(ReflectiveAccessorOptimizer.java:1306) [mvel2-2.2.8.Final-redhat-1.jar:]
    at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeObjectCreation(ReflectiveAccessorOptimizer.java:1236) [mvel2-2.2.8.Final-redhat-1.jar:]
    ... 56 more
Caused by: java.lang.IllegalArgumentException: Illegal pattern character 'n'
    at java.text.SimpleDateFormat.compile(SimpleDateFormat.java:826) [rt.jar:1.8.0_66]
    at java.text.SimpleDateFormat.initialize(SimpleDateFormat.java:634) [rt.jar:1.8.0_66]
    at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:605) [rt.jar:1.8.0_66]
    at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:580) [rt.jar:1.8.0_66]
    ... 62 more