2:40 p.m.
Hi everyone.
I've been trying to use Drools for the past month, and sometimes I have
problems I can't guess anymore how to solve.
This time, every action I try to insert in a ruleflow, I receive a
java.lang.NoSuchMethodError. I'm even trying a really simple ruleflow with
just one simple action - like System.out.println("Test"); - and all I get
is a java.lang.NoSuchMethodError.
[
The stack trace:
java.lang.NoSuchMethodError:
br.com.pst.packages.ruleflows.Process_br_com_pst_packages_ruleflows_0.action0(Lorg/drools/spi/KnowledgeHelper;Lorg/drools/spi/ProcessContext;)V
at
br.com.pst.packages.ruleflows.Process_br_com_pst_packages_ruleflows_0Action0Invoker.execute(
Process_br_com_pst_packages_ruleflows_0Action0Invoker.java:20)
at
org.drools.workflow.instance.node.ActionNodeInstance.internalTrigger(
ActionNodeInstance.java:54)
at org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(
NodeInstanceImpl.java:111)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(
NodeInstanceImpl.java:142)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(
NodeInstanceImpl.java:128)
at
org.drools.workflow.instance.node.StartNodeInstance.triggerCompleted(
StartNodeInstance.java:49)
at
org.drools.workflow.instance.node.StartNodeInstance.internalTrigger(
StartNodeInstance.java:41)
at org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(
NodeInstanceImpl.java:111)
at
org.drools.ruleflow.instance.RuleFlowProcessInstance.internalStart(
RuleFlowProcessInstance.java:16)
at org.drools.process.instance.impl.ProcessInstanceImpl.start(
ProcessInstanceImpl.java:185)
at
org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.start(
WorkflowProcessInstanceImpl.java:230)
at org.drools.common.AbstractWorkingMemory.startProcess(
AbstractWorkingMemory.java:1639)
at org.drools.common.AbstractWorkingMemory.startProcess(
AbstractWorkingMemory.java:1604)
at org.drools.impl.StatefulKnowledgeSessionImpl.startProcess(
StatefulKnowledgeSessionImpl.java:267)
at br.com.pst.packages.ServicePackages.main(
ServicePackages.java:99)
]
Actually, the beginning problem was with my project, with a process and
subprocess. The subprocess works fine, but the main process throws a
java.lang.NoSuchMethodError always on any node I put after a specific
RuleFlowGroup node. Everyting used to work before, but when I begin to
enlarge it, nothing seems to work anymore. And, as I told, I can't always
guess the exact problem as the thrown exceptions are very generic.
Hope anyone could help me!
Thanks a lot
ANA FLÁVIA FONSECA DOS SANTOS
Analista de Desenvolvimento de Software
PST Eletrônica S/A
Phone: +55 19 3787 6379
aflavia(a)pst.com.br
www.pst.com.br
www.positron.com.br
3:49 p.m.
Whenever you add a Java action in your process, the compiler will
generate a Java class in the background that will be used for executing
this action. The error seems to indicate that the class generated by
the compiler is not what the runtime is expecting. Which version of
Drools are you using? And are you compiling and executing with the same
version (or are you for example first building your knowledge base and
then serializing your package or getting it from guvnor)?
If possible, could you include a sample project that shows the issue, so
I could take a look what's going on at runtime?
Kris
This time, every action I try to insert in a ruleflow, I receive a
java.lang.NoSuchMethodError. I'm even trying a really simple ruleflow
with
just one simple action - like System.out.println("Test"); - and all I
get
is a java.lang.NoSuchMethodError.
Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
4:09 p.m.
Kris,
Thanks for trying to help.
I just downloaded drools-5.1.0.SNAPSHOT-bin from
https://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/t...
- which I found in a thread from this mailing list - and changed my
drools runtime in Eclipse. Since then, it seems that all my problems are
solved! There are no weird errors anymore ;)
In any case, I'm using Drools 5, and yes, I'm compiling and executing with
the same version.
Thanks anyway!
ANA FLÁVIA FONSECA DOS SANTOS
Analista de Desenvolvimento de Software
PST Eletrônica S/A
Phone: +55 19 3787 6379
aflavia(a)pst.com.br
www.pst.com.br
www.positron.com.br
From:
Kris Verlaenen <kris.verlaenen(a)cs.kuleuven.be>
To:
Rules Users List <rules-users(a)lists.jboss.org>
Date:
14/09/2009 10:59
Subject:
Re: [rules-users] java.lang.NoSuchMethodError on every Action node
Sent by:
rules-users-bounces(a)lists.jboss.org
Whenever you add a Java action in your process, the compiler will
generate a Java class in the background that will be used for executing
this action. The error seems to indicate that the class generated by
the compiler is not what the runtime is expecting. Which version of
Drools are you using? And are you compiling and executing with the same
version (or are you for example first building your knowledge base and
then serializing your package or getting it from guvnor)?
If possible, could you include a sample project that shows the issue, so
I could take a look what's going on at runtime?
Kris
This time, every action I try to insert in a ruleflow, I receive a
java.lang.NoSuchMethodError. I'm even trying a really simple ruleflow
with
just one simple action - like System.out.println("Test"); - and all I
get
is a java.lang.NoSuchMethodError.
Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
5:36 p.m.
I was struggling with the exact same problem just now.
Since I manually deleted all the rules and class files in my eclipse bin
folder, everything works fine again...
and I'm still using version 5.0.1.
Reto
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12:45 p.m.
I've been struggling with a NoSuchMethodError as well whenever I added any
simple Action to my ruleflow:
java.lang.NoSuchMethodError:
my.package.Process_my_package_0.action0(Lorg/drools/spi/KnowledgeHelper;Ljava/lang/Object;Lorg/drools/spi/ProcessContext;)V
at
my.package.Process_my_package_0Action0Invoker.execute(Process_my_package_0Action0Invoker.java:21)
at
org.drools.workflow.instance.impl.ExtendedNodeInstanceImpl.executeAction(ExtendedNodeInstanceImpl.java:66)
at
org.drools.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerEvent(ExtendedNodeInstanceImpl.java:45)
at
org.drools.workflow.instance.impl.ExtendedNodeInstanceImpl.internalTrigger(ExtendedNodeInstanceImpl.java:28)
at
org.drools.workflow.instance.node.EventBasedNodeInstance.internalTrigger(EventBasedNodeInstance.java:30)
at
org.drools.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:80)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:111)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:141)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:128)
at
org.drools.workflow.instance.node.StartNodeInstance.triggerCompleted(StartNodeInstance.java:49)
at
org.drools.workflow.instance.node.StartNodeInstance.internalTrigger(StartNodeInstance.java:41)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:111)
at
org.drools.ruleflow.instance.RuleFlowProcessInstance.internalStart(RuleFlowProcessInstance.java:16)
at
org.drools.process.instance.impl.ProcessInstanceImpl.start(ProcessInstanceImpl.java:185)
at
org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.start(WorkflowProcessInstanceImpl.java:230)
at
org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1639)
at
org.drools.process.command.StartProcessCommand.execute(StartProcessCommand.java:46)
at
org.drools.process.command.StartProcessCommand.execute(StartProcessCommand.java:10)
at
org.drools.persistence.session.SingleSessionCommandService.execute(SingleSessionCommandService.java:229)
at
org.drools.process.command.impl.CommandBasedStatefulKnowledgeSession.startProcess(CommandBasedStatefulKnowledgeSession.java:163)
In my scenario I have two ruleflows in the knowledge base. One is the
subflow of the other one and both contain an action.
To localize the cause of the problem, I only started the subflow separately
and finally found that the NoSuchMethodError does NOT occur if
- the subprocess is added to the knowledge base AFTER the main process.
- the two processes don't have the same package name
So it seems like there is a name collision. The generated action of the
second ruleflow seems to overwrite the generated action of the first one.
Since both processes dont just execute the same action after that, but
instead the action of the first process is not found, I assume this is a
bug...
The workaround is to simply use different package names.
--
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12:04 p.m.
Hi,
This indeed seems to be related to a conflict of actions. I assume you are
using the same knowledge builder for adding both the main and the sub
process (as that is responsible for resolving possible conflicts)? If so,
could you provide a simple, standalone example that demonstrates this
behaviour so I can take a look?
Kris
----- Original Message -----
From: "retoy" <reto.lamprecht(a)allianz-suisse.ch>
To: <rules-users(a)lists.jboss.org>
Sent: Monday, July 19, 2010 12:45 PM
Subject: Re: [rules-users] java.lang.NoSuchMethodError on every Action node
I've been struggling with a NoSuchMethodError as well whenever I added any
simple Action to my ruleflow:
java.lang.NoSuchMethodError:
my.package.Process_my_package_0.action0(Lorg/drools/spi/KnowledgeHelper;Ljava/lang/Object;Lorg/drools/spi/ProcessContext;)V
at
my.package.Process_my_package_0Action0Invoker.execute(Process_my_package_0Action0Invoker.java:21)
at
org.drools.workflow.instance.impl.ExtendedNodeInstanceImpl.executeAction(ExtendedNodeInstanceImpl.java:66)
at
org.drools.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerEvent(ExtendedNodeInstanceImpl.java:45)
at
org.drools.workflow.instance.impl.ExtendedNodeInstanceImpl.internalTrigger(ExtendedNodeInstanceImpl.java:28)
at
org.drools.workflow.instance.node.EventBasedNodeInstance.internalTrigger(EventBasedNodeInstance.java:30)
at
org.drools.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:80)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:111)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:141)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:128)
at
org.drools.workflow.instance.node.StartNodeInstance.triggerCompleted(StartNodeInstance.java:49)
at
org.drools.workflow.instance.node.StartNodeInstance.internalTrigger(StartNodeInstance.java:41)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:111)
at
org.drools.ruleflow.instance.RuleFlowProcessInstance.internalStart(RuleFlowProcessInstance.java:16)
at
org.drools.process.instance.impl.ProcessInstanceImpl.start(ProcessInstanceImpl.java:185)
at
org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.start(WorkflowProcessInstanceImpl.java:230)
at
org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1639)
at
org.drools.process.command.StartProcessCommand.execute(StartProcessCommand.java:46)
at
org.drools.process.command.StartProcessCommand.execute(StartProcessCommand.java:10)
at
org.drools.persistence.session.SingleSessionCommandService.execute(SingleSessionCommandService.java:229)
at
org.drools.process.command.impl.CommandBasedStatefulKnowledgeSession.startProcess(CommandBasedStatefulKnowledgeSession.java:163)
In my scenario I have two ruleflows in the knowledge base. One is the
subflow of the other one and both contain an action.
To localize the cause of the problem, I only started the subflow
separately
and finally found that the NoSuchMethodError does NOT occur if
- the subprocess is added to the knowledge base AFTER the main process.
- the two processes don't have the same package name
So it seems like there is a name collision. The generated action of the
second ruleflow seems to overwrite the generated action of the first one.
Since both processes dont just execute the same action after that, but
instead the action of the first process is not found, I assume this is a
bug...
The workaround is to simply use different package names.
--
View this message in context:
http://drools-java-rules-engine.46999.n3.nabble.com/java-lang-NoSuchMetho...
Sent from the Drools - User mailing list archive at Nabble.com.
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rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
11:17 a.m.
Hi Kris
Here is a small project which demonstrates a similar problem with two
actions. Unfortunately i could not reproduce the noSuchMethodError in this
setup yet, but i still think the behavior is not as it should be.
http://drools-java-rules-engine.46999.n3.nabble.com/file/n986527/demo.act...
demo.action.problem.zip
If both ruleflow packages have the same name and the two ruleflows are added
in this order:
addRuleFlow(kbuilder, "demo.rf");
addRuleFlow(kbuilder, "subflow.rf");
the output is:
execute subflow...
execute subflow...
If the two flows are added in reverse order, the output is:
demo ruleflow started...
demo ruleflow started...
If one of the package names is changed, the output is what I would expect:
demo ruleflow started...
execute subflow...
What do you think about that?
Reto
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12:17 a.m.
Reto,
This seems to be a conflict with similar actions in different processes
overriding each other. I'll take a look at this and try to fix it asap,
and keep you updated.
Kris
Quoting retoy <reto.lamprecht(a)allianz-suisse.ch>:
Hi Kris
Here is a small project which demonstrates a similar problem with
two
actions. Unfortunately i could not reproduce the noSuchMethodError in
this
setup yet, but i still think the behavior is not as it should be.
http://drools-java-rules-engine.46999.n3.nabble.com/file/n986527/demo.act...
demo.action.problem.zip
If both ruleflow packages have the same name and the two ruleflows
are added
in this order:
addRuleFlow(kbuilder, "demo.rf");
addRuleFlow(kbuilder, "subflow.rf");
the output is:
execute subflow...
execute subflow...
If the two flows are added in reverse order, the output is:
demo ruleflow started...
demo ruleflow started...
If one of the package names is changed, the output is what I would
expect:
demo ruleflow started...
execute subflow...
What do you think about that?
Reto
--
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http://drools-java-rules-engine.46999.n3.nabble.com/java-lang-NoSuchMetho...
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12:02 p.m.
Reto,
I just tried this with the latest trunk code and this seems to be
working correctly:
demo ruleflow started...
execute subflow...
Which version of Drools are you using? Could you also this with the
latest version (the recently released CR1 should be fine:
http://www.jboss.org/drools/downloads.html)? Simply download the
binaries and create a new Drools runtime based on those jars, or
reinstall the entire Eclipse plugin and create a new Drools runtime from
that.
Kris
Quoting retoy <reto.lamprecht(a)allianz-suisse.ch>:
Hi Kris
Here is a small project which demonstrates a similar problem with
two
actions. Unfortunately i could not reproduce the noSuchMethodError in
this
setup yet, but i still think the behavior is not as it should be.
http://drools-java-rules-engine.46999.n3.nabble.com/file/n986527/demo.act...
demo.action.problem.zip
If both ruleflow packages have the same name and the two ruleflows
are added
in this order:
addRuleFlow(kbuilder, "demo.rf");
addRuleFlow(kbuilder, "subflow.rf");
the output is:
execute subflow...
execute subflow...
If the two flows are added in reverse order, the output is:
demo ruleflow started...
demo ruleflow started...
If one of the package names is changed, the output is what I would
expect:
demo ruleflow started...
execute subflow...
What do you think about that?
Reto
--
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http://drools-java-rules-engine.46999.n3.nabble.com/java-lang-NoSuchMetho...
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5026
days inactive
5338
days old
8 comments
4 participants
participants (4)
-
Ana F Santos -
Kris Verlaenen -
Kris Verlaenen
-
retoy