Exception executing consequence for rule xxx in yyy: java.lang.RuntimeException: unable to access field
8:02 p.m.
Has anybody run into this exception with Drools. I get it on 5.4 as well as
5.3. Any help on this is deeply appreciated. Stack trace follows -
Exception occurred during event dispatching:
Exception executing consequence for rule "BORA00005" in InvoiceOnly:
java.lang.RuntimeException: unable to access field
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1283)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1209)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1442)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:230)
at com.deltadental.claims.rules.engine.RuleEngine.executeDRL(Unknown
Source)
at com.deltadental.claims.rules.richUI.BasicRuleTestDialog.execute(Unknown
Source)
at
com.deltadental.claims.rules.richUI.BasicTestCaseExecutionDialog$2.actionPerformed(Unknown
Source)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at
javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at
javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at
javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6297)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3275)
at java.awt.Component.processEvent(Component.java:6062)
at java.awt.Container.processEvent(Container.java:2039)
at java.awt.Component.dispatchEventImpl(Component.java:4660)
at java.awt.Container.dispatchEventImpl(Container.java:2097)
at java.awt.Component.dispatchEvent(Component.java:4488)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4575)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4236)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4166)
at java.awt.Container.dispatchEventImpl(Container.java:2083)
at java.awt.Window.dispatchEventImpl(Window.java:2489)
at java.awt.Component.dispatchEvent(Component.java:4488)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:668)
at java.awt.EventQueue.access$400(EventQueue.java:81)
at java.awt.EventQueue$2.run(EventQueue.java:627)
at java.awt.EventQueue$2.run(EventQueue.java:625)
at java.security.AccessController.doPrivileged(Native Method)
at
java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at
java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
at java.awt.EventQueue$3.run(EventQueue.java:641)
at java.awt.EventQueue$3.run(EventQueue.java:639)
at java.security.AccessController.doPrivileged(Native Method)
at
java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:638)
at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178)
at java.awt.Dialog$1.run(Dialog.java:1044)
at java.awt.Dialog$3.run(Dialog.java:1096)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Dialog.show(Dialog.java:1094)
at
com.deltadental.claims.rules.richUI.util.AbstractJDialog.showCentralized(Unknown
Source)
at
com.deltadental.claims.rules.richUI.BasicTestCaseExecutionDialog.<init>(Unknown
Source)
at
com.deltadental.claims.rules.richUI.BasicRuleTestDialog$2.actionPerformed(Unknown
Source)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at
javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at
javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at
javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6297)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3275)
at java.awt.Component.processEvent(Component.java:6062)
at java.awt.Container.processEvent(Container.java:2039)
at java.awt.Component.dispatchEventImpl(Component.java:4660)
at java.awt.Container.dispatchEventImpl(Container.java:2097)
at java.awt.Component.dispatchEvent(Component.java:4488)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4575)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4236)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4166)
at java.awt.Container.dispatchEventImpl(Container.java:2083)
at java.awt.Window.dispatchEventImpl(Window.java:2489)
at java.awt.Component.dispatchEvent(Component.java:4488)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:668)
at java.awt.EventQueue.access$400(EventQueue.java:81)
at java.awt.EventQueue$2.run(EventQueue.java:627)
at java.awt.EventQueue$2.run(EventQueue.java:625)
at java.security.AccessController.doPrivileged(Native Method)
at
java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at
java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
at java.awt.EventQueue$3.run(EventQueue.java:641)
at java.awt.EventQueue$3.run(EventQueue.java:639)
at java.security.AccessController.doPrivileged(Native Method)
at
java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:638)
at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178)
at java.awt.Dialog$1.run(Dialog.java:1044)
at java.awt.Dialog$3.run(Dialog.java:1096)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Dialog.show(Dialog.java:1094)
at
com.deltadental.claims.rules.richUI.util.AbstractJDialog.showCentralized(Unknown
Source)
at com.deltadental.claims.rules.richUI.BasicRuleTestDialog.<init>(Unknown
Source)
at
com.deltadental.claims.rules.richUI.TestBillingOutputRulePackageDialog.<init>(Unknown
Source)
at
com.deltadental.claims.rules.richUI.BillingOutputGenerationStrategy.startTestRulesPackageDialog(Unknown
Source)
at
com.deltadental.claims.rules.richUI.action.TestRulePackageAction.actionPerformedImpl(Unknown
Source)
at
com.deltadental.claims.rules.richUI.action.DDAbstractAction.actionPerformed(Unknown
Source)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at
javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at
javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:809)
at
javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:850)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
at java.awt.Component.processMouseEvent(Component.java:6297)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3275)
at java.awt.Component.processEvent(Component.java:6062)
at java.awt.Container.processEvent(Container.java:2039)
at java.awt.Component.dispatchEventImpl(Component.java:4660)
at java.awt.Container.dispatchEventImpl(Container.java:2097)
at java.awt.Component.dispatchEvent(Component.java:4488)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4575)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4236)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4166)
at java.awt.Container.dispatchEventImpl(Container.java:2083)
at java.awt.Window.dispatchEventImpl(Window.java:2489)
at java.awt.Component.dispatchEvent(Component.java:4488)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:668)
at java.awt.EventQueue.access$400(EventQueue.java:81)
at java.awt.EventQueue$2.run(EventQueue.java:627)
at java.awt.EventQueue$2.run(EventQueue.java:625)
at java.security.AccessController.doPrivileged(Native Method)
at
java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at
java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
at java.awt.EventQueue$3.run(EventQueue.java:641)
at java.awt.EventQueue$3.run(EventQueue.java:639)
at java.security.AccessController.doPrivileged(Native Method)
at
java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:638)
at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Caused by: java.lang.RuntimeException: unable to access field
at
org.mvel2.optimizers.impl.refl.nodes.DynamicFieldAccessor.setValue(DynamicFieldAccessor.java:66)
at
org.mvel2.optimizers.impl.refl.nodes.VariableAccessor.setValue(VariableAccessor.java:46)
at
org.mvel2.compiler.CompiledAccExpression.setValue(CompiledAccExpression.java:59)
at
org.mvel2.ast.DeepAssignmentNode.getReducedValueAccelerated(DeepAssignmentNode.java:92)
at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)
at
org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:123)
at org.mvel2.MVEL.executeExpression(MVEL.java:930)
at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:101)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1273)
... 130 more
Caused by: java.lang.NullPointerException
at org.mvel2.DataConversion.convert(DataConversion.java:118)
at
org.mvel2.optimizers.impl.refl.nodes.DynamicFieldAccessor.setValue(DynamicFieldAccessor.java:61)
... 138 more
The rule in question is -
rule BORA00005
salience 9998997
when
$billingOutputRuleContext : BillingOutputRuleContext()
$Current_Billing_Cycle :
BCRuleContext((eval(this.getBillingCycleStatusType() ==
BillingCycleStatusType.OUTPUT_IN_PROCESS) &&
eval(this.getRunDate().compareTo($billingOutputRuleContext.getTodayDate())
<= 0)))
$Retroactive_Subscriber_Adjustment :
BSARuleContext((eval(this.getAdjustedBC() != $Current_Billing_Cycle) &&
eval(this.getBillingAdjustmentReasonType() ==
BillingAdjustmentReasonType.COVERAGE_TYPE_CHANGE) &&
eval(this.isNonZero())))
eval(($Retroactive_Subscriber_Adjustment.getAdjustedBC().getBillingClientType()
== BillingClientType.RISK &&
$Current_Billing_Cycle.getSubClientCobraAdminType() == CobraAdminType.NONE))
then
$billingOutputRuleContext.retroPreviousBillAmount =
($billingOutputRuleContext.retroPreviousBillAmount +
$Retroactive_Subscriber_Adjustment.getAdjustedBC().getCurrentBSI().getRISKBilledRate());
$billingOutputRuleContext.stampRule(drools.getRule().getName())
end
--
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Sent from the Drools: User forum mailing list archive at Nabble.com.
8:03 a.m.
The behavior stated seems very erratic as other similar rules are executing.
Also note that the fields in the consequence have a visibility of public.
Are there any known issues surrounding this?
--
View this message in context:
http://drools.46999.n3.nabble.com/Exception-executing-consequence-for-rul...
Sent from the Drools: User forum mailing list archive at Nabble.com.
9:35 a.m.
What's the type of $billingOutputRuleContext.retroPreviousBillAmount?
On 16/01/2013, magaram <magaram(a)deltadentalmi.com> wrote:
The behavior stated seems very erratic as other similar rules are
executing.
Also note that the fields in the consequence have a visibility of public.
Are there any known issues surrounding this?
--
View this message in context:
http://drools.46999.n3.nabble.com/Exception-executing-consequence-for-rul...
Sent from the Drools: User forum mailing list archive at Nabble.com.
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
3:36 p.m.
A rule to repro this situation:
The rule:
...
rule "Assignment In Action Test"
when
obj : Foo()
then
obj.x = 1;
System.out.println("Rule Fired!");
end
...
Definition of class Foo:
public class Foo {
public int x;
public int getX() {
return x;
}
public void setX(int x) {
this.x = x;
}
}
Objects been inserted:
Foo foo1 = new Foo();
foo1.x = 0;
Foo foo2 = new Foo();
Foo2.x = 1000;
Note that if only one Foo object is inserted, things work fine. If more than one Foo
objects are inserted, we see this Exception:
Exception executing consequence for rule "Assignment In Action Test" in
com.sample: java.lang.RuntimeException: unable to access field
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1283)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1209)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1442)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:230)
at com.sample.AssignmentInActionTestMain.main(AssignmentInActionTestMain.java:37)
Caused by: java.lang.RuntimeException: unable to access field
at
org.mvel2.optimizers.impl.refl.nodes.DynamicFieldAccessor.setValue(DynamicFieldAccessor.java:66)
at
org.mvel2.optimizers.impl.refl.nodes.IndexedVariableAccessor.setValue(IndexedVariableAccessor.java:43)
at org.mvel2.compiler.CompiledAccExpression.setValue(CompiledAccExpression.java:59)
at
org.mvel2.ast.DeepAssignmentNode.getReducedValueAccelerated(DeepAssignmentNode.java:92)
at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)
at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:126)
at org.mvel2.MVEL.executeExpression(MVEL.java:930)
at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:101)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1273)
... 6 more
Caused by: java.lang.NullPointerException
at org.mvel2.DataConversion.convert(DataConversion.java:118)
at
org.mvel2.optimizers.impl.refl.nodes.DynamicFieldAccessor.setValue(DynamicFieldAccessor.java:61)
... 14 more
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On
Behalf Of Wolfgang Laun
Sent: Wednesday, January 16, 2013 10:35 AM
To: Rules Users List
Subject: Re: [rules-users] Exception executing consequence for rule xxx in yyy:
java.lang.RuntimeException: unable to access field
What's the type of $billingOutputRuleContext.retroPreviousBillAmount?
On 16/01/2013, magaram <magaram(a)deltadentalmi.com> wrote:
The behavior stated seems very erratic as other similar rules are
executing.
Also note that the fields in the consequence have a visibility of public.
Are there any known issues surrounding this?
--
View this message in context:
http://drools.46999.n3.nabble.com/Exception-executing-consequence-for-
rule-xxx-in-yyy-java-lang-RuntimeException-unable-to-access-field-tp40
21553p4021576.html Sent from the Drools: User forum mailing list
archive at Nabble.com.
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
**********************************************************************
CONFIDENTIALITY NOTICE: The information contained in this email is intended only for the
person or entity to which it is addressed and may contain confidential and/or privileged
material. If you are not the intended recipient, you are hereby notified that any
unauthorized review, use, dissemination, distribution or copying of this communication is
prohibited and may be subject to legal restriction or sanction. If you have received this
email in error, please notify the sender immediately to arrange for return or destruction
of the information and all copies. If you are the intended recipient but do not wish to
receive communications through this medium, please advise the sender immediately. Thank
you
12:29 a.m.
The error occurs when the following rule fires ;-)
rule "error occurs"
$fact1: Fact( $class: class )
$fact2: Fact( class == $class, this != $fact1 )
Field( $name: name, type == $class, modifiers == Modifier.PUBLIC )
Rule( dialect == "mvel",
$rule: name
rightHandSide matches (".\\s*" + $name +
"\\s*=\\s*\S+\\s*;" ) );
then
System.out.println( "When rule " + $rule + " fires, an exception
occurs" );
end
In words:
All the following conditions must be met:
* WM contains at least two facts of the same type
* there is a public field
* the rule's dialect is set to MVEL
* a rule's right hand side contains an assignment to the public field
Occurs with versions 5.[2345].0
-W
On 16/01/2013, Chang Liu <CLiu(a)deltadentalmi.com> wrote:
A rule to repro this situation:
The rule:
...
rule "Assignment In Action Test"
when
obj : Foo()
then
obj.x = 1;
System.out.println("Rule Fired!");
end
...
Definition of class Foo:
public class Foo {
public int x;
public int getX() {
return x;
}
public void setX(int x) {
this.x = x;
}
}
Objects been inserted:
Foo foo1 = new Foo();
foo1.x = 0;
Foo foo2 = new Foo();
Foo2.x = 1000;
Note that if only one Foo object is inserted, things work fine. If more than
one Foo objects are inserted, we see this Exception:
Exception executing consequence for rule "Assignment In Action Test" in
com.sample: java.lang.RuntimeException: unable to access field
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1283)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1209)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1442)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:230)
at
com.sample.AssignmentInActionTestMain.main(AssignmentInActionTestMain.java:37)
Caused by: java.lang.RuntimeException: unable to access field
at
org.mvel2.optimizers.impl.refl.nodes.DynamicFieldAccessor.setValue(DynamicFieldAccessor.java:66)
at
org.mvel2.optimizers.impl.refl.nodes.IndexedVariableAccessor.setValue(IndexedVariableAccessor.java:43)
at
org.mvel2.compiler.CompiledAccExpression.setValue(CompiledAccExpression.java:59)
at
org.mvel2.ast.DeepAssignmentNode.getReducedValueAccelerated(DeepAssignmentNode.java:92)
at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)
at
org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:126)
at org.mvel2.MVEL.executeExpression(MVEL.java:930)
at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:101)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1273)
... 6 more
Caused by: java.lang.NullPointerException
at org.mvel2.DataConversion.convert(DataConversion.java:118)
at
org.mvel2.optimizers.impl.refl.nodes.DynamicFieldAccessor.setValue(DynamicFieldAccessor.java:61)
... 14 more
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Wolfgang Laun
Sent: Wednesday, January 16, 2013 10:35 AM
To: Rules Users List
Subject: Re: [rules-users] Exception executing consequence for rule xxx in
yyy: java.lang.RuntimeException: unable to access field
What's the type of $billingOutputRuleContext.retroPreviousBillAmount?
On 16/01/2013, magaram <magaram(a)deltadentalmi.com> wrote:
> The behavior stated seems very erratic as other similar rules are
> executing.
> Also note that the fields in the consequence have a visibility of public.
> Are there any known issues surrounding this?
>
>
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/Exception-executing-consequence-for-
> rule-xxx-in-yyy-java-lang-RuntimeException-unable-to-access-field-tp40
> 21553p4021576.html Sent from the Drools: User forum mailing list
> archive at Nabble.com.
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
**********************************************************************
CONFIDENTIALITY NOTICE: The information contained in this email is intended
only for the person or entity to which it is addressed and may contain
confidential and/or privileged material. If you are not the intended
recipient, you are hereby notified that any unauthorized review, use,
dissemination, distribution or copying of this communication is prohibited
and may be subject to legal restriction or sanction. If you have received
this email in error, please notify the sender immediately to arrange for
return or destruction of the information and all copies. If you are the
intended recipient but do not wish to receive communications through this
medium, please advise the sender immediately. Thank you
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
2:09 a.m.
Thank you Wolfgang,
your bug report is crystal clear as usual ;)
I'll try to reproduce and fix this asap.
Mario
On Thu, Jan 17, 2013 at 7:29 AM, Wolfgang Laun <wolfgang.laun(a)gmail.com>wrote:
The error occurs when the following rule fires ;-)
rule "error occurs"
$fact1: Fact( $class: class )
$fact2: Fact( class == $class, this != $fact1 )
Field( $name: name, type == $class, modifiers == Modifier.PUBLIC )
Rule( dialect == "mvel",
$rule: name
rightHandSide matches (".\\s*" + $name +
"\\s*=\\s*\S+\\s*;" )
);
then
System.out.println( "When rule " + $rule + " fires, an exception
occurs" );
end
In words:
All the following conditions must be met:
* WM contains at least two facts of the same type
* there is a public field
* the rule's dialect is set to MVEL
* a rule's right hand side contains an assignment to the public field
Occurs with versions 5.[2345].0
-W
On 16/01/2013, Chang Liu <CLiu(a)deltadentalmi.com> wrote:
> A rule to repro this situation:
>
> The rule:
> ...
> rule "Assignment In Action Test"
> when
> obj : Foo()
> then
> obj.x = 1;
> System.out.println("Rule Fired!");
> end
> ...
>
> Definition of class Foo:
> public class Foo {
> public int x;
> public int getX() {
> return x;
> }
> public void setX(int x) {
> this.x = x;
> }
> }
>
> Objects been inserted:
> Foo foo1 = new Foo();
> foo1.x = 0;
> Foo foo2 = new Foo();
> Foo2.x = 1000;
>
> Note that if only one Foo object is inserted, things work fine. If more
than
> one Foo objects are inserted, we see this Exception:
>
> Exception executing consequence for rule "Assignment In Action Test" in
> com.sample: java.lang.RuntimeException: unable to access field
> at
>
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
> at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1283)
> at
org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1209)
> at
org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1442)
> at
>
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)
> at
>
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)
> at
>
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:230)
> at
>
com.sample.AssignmentInActionTestMain.main(AssignmentInActionTestMain.java:37)
> Caused by: java.lang.RuntimeException: unable to access field
> at
>
org.mvel2.optimizers.impl.refl.nodes.DynamicFieldAccessor.setValue(DynamicFieldAccessor.java:66)
> at
>
org.mvel2.optimizers.impl.refl.nodes.IndexedVariableAccessor.setValue(IndexedVariableAccessor.java:43)
> at
>
org.mvel2.compiler.CompiledAccExpression.setValue(CompiledAccExpression.java:59)
> at
>
org.mvel2.ast.DeepAssignmentNode.getReducedValueAccelerated(DeepAssignmentNode.java:92)
> at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)
> at
>
org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:126)
> at org.mvel2.MVEL.executeExpression(MVEL.java:930)
> at
org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:101)
> at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1273)
> ... 6 more
> Caused by: java.lang.NullPointerException
> at org.mvel2.DataConversion.convert(DataConversion.java:118)
> at
>
org.mvel2.optimizers.impl.refl.nodes.DynamicFieldAccessor.setValue(DynamicFieldAccessor.java:61)
> ... 14 more
>
> -----Original Message-----
> From: rules-users-bounces(a)lists.jboss.org
> [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Wolfgang Laun
> Sent: Wednesday, January 16, 2013 10:35 AM
> To: Rules Users List
> Subject: Re: [rules-users] Exception executing consequence for rule xxx
in
> yyy: java.lang.RuntimeException: unable to access field
>
> What's the type of $billingOutputRuleContext.retroPreviousBillAmount?
>
> On 16/01/2013, magaram <magaram(a)deltadentalmi.com> wrote:
>> The behavior stated seems very erratic as other similar rules are
>> executing.
>> Also note that the fields in the consequence have a visibility of
public.
>> Are there any known issues surrounding this?
>>
>>
>>
>> --
>> View this message in context:
>> http://drools.46999.n3.nabble.com/Exception-executing-consequence-for-
>> rule-xxx-in-yyy-java-lang-RuntimeException-unable-to-access-field-tp40
>> 21553p4021576.html Sent from the Drools: User forum mailing list
>> archive at Nabble.com.
>> _______________________________________________
>> rules-users mailing list
>> rules-users(a)lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
> **********************************************************************
> CONFIDENTIALITY NOTICE: The information contained in this email is
intended
> only for the person or entity to which it is addressed and may contain
> confidential and/or privileged material. If you are not the intended
> recipient, you are hereby notified that any unauthorized review, use,
> dissemination, distribution or copying of this communication is
prohibited
> and may be subject to legal restriction or sanction. If you have received
> this email in error, please notify the sender immediately to arrange for
> return or destruction of the information and all copies. If you are the
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> _______________________________________________
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>
3:41 p.m.
Another note, using obj.setX(...) would make this problem go away.
Question: are there anything special that a user should be aware of about putting
assignment in rule actions?
-----Original Message-----
From: Chang Liu
Sent: Wednesday, January 16, 2013 4:37 PM
To: Rules Users List
Cc: Mukundan Agaram
Subject: RE: [rules-users] Exception executing consequence for rule xxx in yyy:
java.lang.RuntimeException: unable to access field
A rule to repro this situation:
The rule:
...
rule "Assignment In Action Test"
when
obj : Foo()
then
obj.x = 1;
System.out.println("Rule Fired!");
end ...
Definition of class Foo:
public class Foo {
public int x;
public int getX() {
return x;
}
public void setX(int x) {
this.x = x;
}
}
Objects been inserted:
Foo foo1 = new Foo();
foo1.x = 0;
Foo foo2 = new Foo();
Foo2.x = 1000;
Note that if only one Foo object is inserted, things work fine. If more than one Foo
objects are inserted, we see this Exception:
Exception executing consequence for rule "Assignment In Action Test" in
com.sample: java.lang.RuntimeException: unable to access field
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1283)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1209)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1442)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:230)
at com.sample.AssignmentInActionTestMain.main(AssignmentInActionTestMain.java:37)
Caused by: java.lang.RuntimeException: unable to access field
at
org.mvel2.optimizers.impl.refl.nodes.DynamicFieldAccessor.setValue(DynamicFieldAccessor.java:66)
at
org.mvel2.optimizers.impl.refl.nodes.IndexedVariableAccessor.setValue(IndexedVariableAccessor.java:43)
at org.mvel2.compiler.CompiledAccExpression.setValue(CompiledAccExpression.java:59)
at
org.mvel2.ast.DeepAssignmentNode.getReducedValueAccelerated(DeepAssignmentNode.java:92)
at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)
at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:126)
at org.mvel2.MVEL.executeExpression(MVEL.java:930)
at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:101)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1273)
... 6 more
Caused by: java.lang.NullPointerException
at org.mvel2.DataConversion.convert(DataConversion.java:118)
at
org.mvel2.optimizers.impl.refl.nodes.DynamicFieldAccessor.setValue(DynamicFieldAccessor.java:61)
... 14 more
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On
Behalf Of Wolfgang Laun
Sent: Wednesday, January 16, 2013 10:35 AM
To: Rules Users List
Subject: Re: [rules-users] Exception executing consequence for rule xxx in yyy:
java.lang.RuntimeException: unable to access field
What's the type of $billingOutputRuleContext.retroPreviousBillAmount?
On 16/01/2013, magaram <magaram(a)deltadentalmi.com> wrote:
The behavior stated seems very erratic as other similar rules are
executing.
Also note that the fields in the consequence have a visibility of public.
Are there any known issues surrounding this?
--
View this message in context:
http://drools.46999.n3.nabble.com/Exception-executing-consequence-for-
rule-xxx-in-yyy-java-lang-RuntimeException-unable-to-access-field-tp40
21553p4021576.html Sent from the Drools: User forum mailing list
archive at Nabble.com.
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
**********************************************************************
CONFIDENTIALITY NOTICE: The information contained in this email is intended only for the
person or entity to which it is addressed and may contain confidential and/or privileged
material. If you are not the intended recipient, you are hereby notified that any
unauthorized review, use, dissemination, distribution or copying of this communication is
prohibited and may be subject to legal restriction or sanction. If you have received this
email in error, please notify the sender immediately to arrange for return or destruction
of the information and all copies. If you are the intended recipient but do not wish to
receive communications through this medium, please advise the sender immediately. Thank
you
8:21 a.m.
Laune -
I am sorry - I did not answer your earlier question. The type in this
instance was a double. But we have this exception consistently if all of
these conditions are met -
1.) In the consequence we do an assignment to a public field.
2.) There are more than one instance of the same rule firing based on
multiple tuples that match it.
The workaround seems to be to replace the field assignment with a setter
invocation on the field.
i.e.
in lieu of
when
...
then
$foo.x = $bar.y +$bar.z
...
end
do -
when
...
then
$foo.setX($bar.y +$bar.z)
...
end
However as I am testing with this workaround I am seeing other issues. I am
starting to see execution hangs in certain testcases. I have a parallel of
running these on ILOG JRules and they work - so I am certain that there are
no inadvertant infinite loop invocations between rules.
Thanks,
Muk
--
View this message in context:
http://drools.46999.n3.nabble.com/Exception-executing-consequence-for-rul...
Sent from the Drools: User forum mailing list archive at Nabble.com.
4142
days inactive
4143
days old
7 comments
4 participants
participants (4)
-
Chang Liu -
magaram -
Mario Fusco -
Wolfgang Laun