Task Server gives error cannot use getTransaction()
by Todd Pagni
When I configure the Task Server(org.drools.task) to be JTA I get the
following error when adding a Human Task work item. Is the following
Persistence Unit configuration valid? It works when the org.drools.task
trans type is set to LOCAL_RESOURCE.
Using drools 5.1.0.M1 in JBoss 5.1
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<persistence version="1.0"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd
http://java.sun.com/xml/ns/persistence/orm
http://java.sun.com/xml/ns/persistence/orm_1_0.xsd"
xmlns:orm="http://java.sun.com/xml/ns/persistence/orm"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/persistence">
<persistence-unit name="org.drools.persistence.jpa"
transaction-type="JTA">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>java:/processInstanceDS</jta-data-source>
<mapping-file>META-INF/orm.xml</mapping-file>
<class>org.drools.persistence.session.SessionInfo</class>
<class>org.drools.persistence.processinstance.ProcessInstanceInfo</class
>
<class>org.drools.persistence.processinstance.WorkItemInfo</class>
<class>org.drools.persistence.processinstance.variabletypes.JPAPersisted
Variable</class>
<class>org.drools.persistence.processinstance.variabletypes.VariableInst
anceInfo</class>
<properties>
<property name="hibernate.dialect"
value="org.hibernate.dialect.SQLServerDialect" />
<property name="hibernate.max_fetch_depth" value="3"
/>
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.hbm2ddl.auto" value="update"
/>
<property name="hibernate.connection.release_mode"
value="auto" />
<property
name="hibernate.transaction.manager_lookup_class"
value="org.hibernate.transaction.JBossTransactionManagerLookup" />
<property
name="jboss.entity.manager.factory.jndi.name"
value="java:/WorkflowServerPU" />
</properties>
</persistence-unit>
<persistence-unit name="org.drools.task" transaction-type="
RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>java:/processInstanceDS</jta-data-source>
<mapping-file>META-INF/taskorm.xml</mapping-file>
<class>org.drools.task.Attachment</class>
<class>org.drools.task.Content</class>
<class>org.drools.task.BooleanExpression</class>
<class>org.drools.task.Comment</class>
<class>org.drools.task.Deadline</class>
<class>org.drools.task.Comment</class>
<class>org.drools.task.Deadline</class>
<class>org.drools.task.Delegation</class>
<class>org.drools.task.Escalation</class>
<class>org.drools.task.Group</class>
<class>org.drools.task.I18NText</class>
<class>org.drools.task.Notification</class>
<class>org.drools.task.EmailNotification</class>
<class>org.drools.task.EmailNotificationHeader</class>
<class>org.drools.task.PeopleAssignments</class>
<class>org.drools.task.Reassignment</class>
<class>org.drools.task.Status</class>
<class>org.drools.task.Task</class>
<class>org.drools.task.TaskData</class>
<class>org.drools.task.SubTasksStrategy</class>
<class>org.drools.task.OnParentAbortAllSubTasksEndStrategy</class>
<class>org.drools.task.OnAllSubTasksEndParentEndStrategy</class>
<class>org.drools.task.User</class>
<properties>
<property name="hibernate.dialect"
value="org.hibernate.dialect.SQLServerDialect" />
<property name="hibernate.max_fetch_depth" value="3"
/>
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.hbm2ddl.auto" value="update"
/>
<property name="hibernate.connection.release_mode"
value="auto" />
<property
name="hibernate.transaction.manager_lookup_class"
value="org.hibernate.transaction.JBossTransactionManagerLookup" />
<property
name="jboss.entity.manager.factory.jndi.name"
value="java:/WorkflowServerPU" />
</properties>
</persistence-unit>
</persistence>
10:48:22,887 INFO [STDOUT] Hibernate: update WorkItemInfo set
creationDate=?, name=?, processInstanceId=?, state=?, OPTLOCK=?,
workItemByteArray=? where workItemId=? and OPTLOCK=?
10:48:22,887 INFO [STDOUT] [2010:01:20 10:01:887:debug] Message
receieved on server : AddTaskRequest
10:48:22,887 INFO [STDOUT] [2010:01:20 10:01:887:debug] Arguments :
[org.drools.task.Task@537c3c9e,
org.drools.task.service.ContentData@b2a90]
10:48:22,887 INFO [STDOUT] [2010:01:20 10:01:887:exception] A JTA
EntityManager cannot use getTransaction()
10:48:22,887 INFO [STDOUT] java.lang.IllegalStateException: A JTA
EntityManager cannot use getTransaction()
10:48:22,887 INFO [STDOUT] at
org.hibernate.ejb.AbstractEntityManagerImpl.getTransaction(AbstractEntit
yManagerImpl.java:324)
10:48:22,887 INFO [STDOUT] at
org.drools.task.service.TaskServiceSession.doOperationInTransaction(Task
ServiceSession.java:676)
10:48:22,887 INFO [STDOUT] at
org.drools.task.service.TaskServiceSession.addTask(TaskServiceSession.ja
va:118)
10:48:22,887 INFO [STDOUT] at
org.drools.task.service.TaskServerHandler.messageReceived(TaskServerHand
ler.java:88)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.message
Received(DefaultIoFilterChain.java:752)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageRec
eived(DefaultIoFilterChain.java:414)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(Defaul
tIoFilterChain.java:49)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messag
eReceived(DefaultIoFilterChain.java:832)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputIm
pl.flush(ProtocolCodecFilter.java:379)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(Protoco
lCodecFilter.java:173)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageRec
eived(DefaultIoFilterChain.java:414)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(Defaul
tIoFilterChain.java:49)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messag
eReceived(DefaultIoFilterChain.java:832)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.filter.logging.LoggingFilter.messageReceived(LoggingFilt
er.java:95)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageRec
eived(DefaultIoFilterChain.java:414)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(Defaul
tIoFilterChain.java:49)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messag
eReceived(DefaultIoFilterChain.java:832)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.core.filterchain.DefaultIoFilterChain$HeadFilter.message
Received(DefaultIoFilterChain.java:616)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageRec
eived(DefaultIoFilterChain.java:414)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceive
d(DefaultIoFilterChain.java:408)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPol
lingIoProcessor.java:578)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(Abstract
PollingIoProcessor.java:540)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(Abstract
PollingIoProcessor.java:532)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(Abstr
actPollingIoProcessor.java:58)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.core.polling.AbstractPollingIoProcessor$Worker.run(Abstr
actPollingIoProcessor.java:857)
10:48:22,887 INFO [STDOUT] at
org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.j
ava:51)
10:48:22,887 INFO [STDOUT] at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecuto
r.java:651)
10:48:22,887 INFO [STDOUT] at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.ja
va:676)
10:48:22,887 INFO [STDOUT] at java.lang.Thread.run(Thread.java:595)
10:48:22,887 ERROR [STDERR] java.lang.IllegalStateException: A JTA
EntityManager cannot use getTransaction()
10:48:22,887 ERROR [STDERR] at
org.hibernate.ejb.AbstractEntityManagerImpl.getTransaction(AbstractEntit
yManagerImpl.java:324)
10:48:22,887 ERROR [STDERR] at
org.drools.task.service.TaskServiceSession.doOperationInTransaction(Task
ServiceSession.java:676)
10:48:22,887 ERROR [STDERR] at
org.drools.task.service.TaskServiceSession.addTask(TaskServiceSession.ja
va:118)
10:48:22,887 ERROR [STDERR] at
org.drools.task.service.TaskServerHandler.messageReceived(TaskServerHand
ler.java:88)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.message
Received(DefaultIoFilterChain.java:752)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageRec
eived(DefaultIoFilterChain.java:414)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(Defaul
tIoFilterChain.java:49)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messag
eReceived(DefaultIoFilterChain.java:832)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputIm
pl.flush(ProtocolCodecFilter.java:379)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(Protoco
lCodecFilter.java:173)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageRec
eived(DefaultIoFilterChain.java:414)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(Defaul
tIoFilterChain.java:49)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messag
eReceived(DefaultIoFilterChain.java:832)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.filter.logging.LoggingFilter.messageReceived(LoggingFilt
er.java:95)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageRec
eived(DefaultIoFilterChain.java:414)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(Defaul
tIoFilterChain.java:49)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messag
eReceived(DefaultIoFilterChain.java:832)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.core.filterchain.DefaultIoFilterChain$HeadFilter.message
Received(DefaultIoFilterChain.java:616)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageRec
eived(DefaultIoFilterChain.java:414)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceive
d(DefaultIoFilterChain.java:408)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPol
lingIoProcessor.java:578)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(Abstract
PollingIoProcessor.java:540)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(Abstract
PollingIoProcessor.java:532)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(Abstr
actPollingIoProcessor.java:58)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.core.polling.AbstractPollingIoProcessor$Worker.run(Abstr
actPollingIoProcessor.java:857)
10:48:22,887 ERROR [STDERR] at
org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.j
ava:51)
10:48:22,887 ERROR [STDERR] at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecuto
r.java:651)
10:48:22,887 ERROR [STDERR] at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.ja
va:676)
10:48:22,887 ERROR [STDERR] at java.lang.Thread.run(Thread.java:595)
10:48:22,903 INFO [LoggingFilter] SENT: HeapBuffer[pos=0 lim=2200
cap=4096: 00 00 08 94 AC ED 00 05 73 72 01 00 1F 6F 72 67...]
10:48:22,903 INFO [LoggingFilter] SENT: HeapBuffer[pos=0 lim=0 cap=0:
empty]
10:48:22,903 INFO [STDOUT] [2010:01:20 10:01:903:debug] Message
receieved on client : AddTaskResponse
10:48:22,903 INFO [STDOUT] [2010:01:20 10:01:903:debug] Arguments :
[java.lang.IllegalStateExcep
16 years
"from" keyword does not actually check types?
by Jevon Wright
Hi,
I am using Drools 4.0.7, and I had a DRL rule similar to the following:
rule "..."
when
other : Foo( )
x : Bar( ) from other.property
then
...
end
An unexpected bug occured. In some situations, other.property would _not_ be
of type Bar, yet Drools would still think that it was. As a result I was
getting some unusual exceptions being thrown: "org.mvel.CompileException:
unable to resolve property: ..."
If I changed the rule to:
x : Bar( ) from other.property
eval ( x instanceof Bar )
It would instead throw a ClassCastException (i.e. "Baz cannot be cast into
Bar").
If, instead, I changed the rule to:
x : Bar( other.property == x )
It would start working correctly, and 'x' would only be of type Bar.
Is this known behaviour? Is it expected? If so, I would appreciate it if the
4.0.7 documentation was updated to reflect that "from" actually ignores the
return type of properties. It took me a couple of hours to detect and fix
this bug.
I would try these rules in Drools 5.x, but I'm still waiting for the
blocking JBRULES-2218 to be resolved.
Cheers
Jevon
16 years
Drools Flow / Declarative process definition
by Jaroslav Pullmann
Dear Drools team,
I like much the approach of Drools Flow and would appreciate to learn more.
The documentation states the extended rule engine having knowledge of the process model
and instance state derives the next process execution step. I am wondering, whether the
overall flow is reactive, even the procedural constructs like sequence, branching/joining
are implemented through firing rule actions ? For example, does Drools Flow converts the
sequence of steps A -> B into sth. like "when A.passed then B.start()" ?
When the prevoius holds, does Drools Flow allows to create (desgin) and execute declarative processes
omiting any explicit sequencing ? The steps/tasks were ordered partially by data- or event-based
dependency conditions or even activated independently of each other.
Drools Flow/Expert provide a thight integration with Java (e.g. representing facts as Java classes).
Are there future plans for supporting a higher-level processing with XML/XPath/XQuery like in YAWL ?
Many thanks
Jaro
--
Jaroslav Pullmann
Web Compliance Center - Fraunhofer FIT
Schloss Birlinghoven, D-53757 Sankt Augustin, Germany
Phone: +49-2241-142623 Fax: +49-2241-142065
16 years
Process with subprocesses don't continue after finish work items in the subprocesses
by Dirk
Hey Drools-Users,
I've got a big and urgent problem with my drools process. I have a complex
process with many decisions and subprocesses. These subprocesses could even
contains more subprocesses so that i have a four-level flow.
I testet each subprocess isolated in a mock environment and now i get my
problem when they are combined in a big "super-process". I create the
process with the JPAKnowledgeService (and VariablePersistenceStrategy) and
everything works as expected. The process execute some actions, a
validation-subprocess and another subprocess with a human task (with a
custom handler). The process stops and persist all the variables (except
Integers; Must be a bug?). Perfect. Now I load the session with the
JPAKnowledgeService and complete the workitem with the
ksession.getWorkItemManager().completeWorkItem method. The subprocess now
execute to the end and then the engine stopps without an error. But there
are more steps in the superprocess todo. All subprocesse are "independent =
true" with "wait for completion = true" and don't have timers.
Has anybody an idea? Is this a known problem? I'm using the last
successfully build form the 21.02.2010. Do you need the process? (Then i
have to remove some internal information and could post it...)
Many thanks in advance
Dirk
--
View this message in context: http://n3.nabble.com/Process-with-subprocesses-don-t-continue-after-finis...
Sent from the Drools - User mailing list archive at Nabble.com.
16 years
Using DeadLines in Human Task
by ramram
Hi All,
I am trying to use the DeadLine option in the human task but I am having
the following exception once trying to run the task: I am trying to run the
task from the eclipse. Any Ideas????
[2010:02:55 13:02:118:exception] Uncaught exception on client
org.apache.mina.filter.codec.ProtocolDecoderException:
org.apache.mina.core.buffer.BufferDataException:
java.io.InvalidClassException: failed to read class descriptor (Hexdump:
...........)
at
org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:231)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:431)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$5(DefaultIoFilterChain.java:426)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:787)
at
org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:119)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:431)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:423)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:635)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:595)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:584)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.access$7(AbstractPollingIoProcessor.java:581)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:966)
at
org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:61)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.mina.core.buffer.BufferDataException:
java.io.InvalidClassException: failed to read class descriptor
at
org.apache.mina.core.buffer.AbstractIoBuffer.getObject(AbstractIoBuffer.java:1984)
at
org.apache.mina.filter.codec.serialization.ObjectSerializationDecoder.doDecode(ObjectSerializationDecoder.java:92)
at
org.apache.mina.filter.codec.CumulativeProtocolDecoder.decode(CumulativeProtocolDecoder.java:178)
at
org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:221)
... 15 more
Caused by: java.io.InvalidClassException: failed to read class descriptor
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
at java.io.ObjectInputStream.readSerialData(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at java.util.ArrayList.readObject(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at java.io.ObjectStreamClass.invokeReadObject(Unknown Source)
at java.io.ObjectInputStream.readSerialData(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
at java.io.ObjectInputStream.readSerialData(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at
org.apache.mina.core.buffer.AbstractIoBuffer.getObject(AbstractIoBuffer.java:1982)
... 18 more
Caused by: java.lang.ClassNotFoundException:
org.hibernate.PersistentObjectException
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at
org.apache.mina.core.buffer.AbstractIoBuffer$3.readClassDescriptor(AbstractIoBuffer.java:1962)
... 42 more
--
View this message in context: http://n3.nabble.com/Using-DeadLines-in-Human-Task-tp412870p412870.html
Sent from the Drools - User mailing list archive at Nabble.com.
16 years
Refreshing RuleBase using the Guvnor
by Jeffrey Schneller
I posted about caching and after some more investigation it appears the problem lies in just refreshing the rulebase.
I created a simple package that contains 1 excel decision table which has 1 rule [row] in it. I ran my application. Then rebuilt the package in the Guvnor and my application refreshed the rule base correctly.
I have other packages which contain many 100 rules if not 1000 rules all based on multiple excel based decision tables. If I run my application, then rebuild the package in the Guvnor, my application throws the exception.
RuleAgent(Assembly) EXCEPTION (Fri Feb 26 12:02:32 EST 2010): java.lang.ClassCastException: org.drools.util.ObjectHashMap cannot be cast to org.drools.reteoo.BetaMemory. Stack trace should follow.
org.drools.RuntimeDroolsException: java.lang.ClassCastException: org.drools.util.ObjectHashMap cannot be cast to org.drools.reteoo.BetaMemory
It appears the problem occurs where there are many rules. Any ideas?
Thanks.
16 years
Caching RuleBase
by Jeffrey Schneller
I saw some old thread about caching the rule base on your own. I have a singleton which contains a hashmap to do the caching. I am using the Guvnor to pull my rules from. This works fine except when the rules change on the Guvnor. When the rule base tries to refresh in my application, I am getting a ClassCastException. Any ideas?
RuleAgent(Assembly) EXCEPTION (Fri Feb 26 12:02:32 EST 2010): java.lang.ClassCastException: org.drools.util.ObjectHashMap cannot be cast to org.drools.reteoo.BetaMemory. Stack trace should follow.
org.drools.RuntimeDroolsException: java.lang.ClassCastException: org.drools.util.ObjectHashMap cannot be cast to org.drools.reteoo.BetaMemory
My code to do the caching is below:
private HashMap<String, RuleBase> ruleBaseMap = new HashMap<String, RuleBase>();
// check to see if we already set up this rule base
if (ruleBaseMap.containsKey(product.getConfigurationRule())) {
rb = ruleBaseMap.get(product.getConfigurationRule());
} else {
try {
InitialContext context = new InitialContext();
url = (String) context.lookup("java:comp/env/rules.url");
url = url + product.getConfigurationRule() + "/LATEST";
} catch (NamingException e1) {
}
Properties config = new Properties();
config.setProperty("newInstance", "false");
config.setProperty("url", url);
config.setProperty("poll", "300");
config.setProperty("name", "Assembly");
RuleAgent agent = RuleAgent.newRuleAgent(config);
rb = agent.getRuleBase();
ruleBaseMap.put(product.getConfigurationRule(), rb);
}
16 years
