What's the use of the RemoveIdentitiesOption?
by Wolfgang Laun
I do understand both ways of the AssertBehaviorOption, but what's the
function of the RemoveIdentitiesOption? (This one's not in Drools Expert,
and Javadoc doesn't explain.)
-W
15 years, 6 months
Persistence.createEntityManagerFactory NullPointerException
by 亮亮
hi:
in my webapp, I use JPA to store the runtime state,i use this code in
VdcService.java which is a sample java class:
EntityManagerFactory emf =Persistence.createEntityManagerFactory(
"org.drools.persistence.jpa" );
Environment env = KnowledgeBaseFactory.newEnvironment();
env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, emf );
// create a new knowledge session that uses JPA to store the runtime state
StatefulKnowledgeSession ksession =
JPAKnowledgeService.newStatefulKnowledgeSession( kbase, null, env );
I put persistence.xml to webRoot/META-INF/ , persistence.xml:
<?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:comp/env/jdbc/mysql</jta-data-source>
<class>org.drools.persistence.session.SessionInfo</class>
<class>org.drools.persistence.processinstance.ProcessInstanceInfo</class>
<class>org.drools.persistence.processinstance.ProcessInstanceEventInfo</class>
<class>org.drools.persistence.processinstance.WorkItemInfo</class>
<properties>
<property name="hibernate.dialect"
value="org.hibernate.dialect.MySQLDialect"/>
<property name="hibernate.max_fetch_depth" value="3"/>
<property name="hibernate.hbm2ddl.auto" value="create" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.transaction.manager_lookup_class"
value="org.hibernate.transaction.BTMTransactionManagerLookup" />
</properties>
</persistence-unit>
</persistence>
I use resin 3.1.10, $resin-home/conf/resin.conf:
<database>
<jndi-name>jdbc/mysql</jndi-name>
<driver type="org.gjt.mm.mysql.Driver">
<url>jdbc:mysql://127.0.0.1:3306/test</url>
<user>root</user>
<password></password>
</driver>
<prepared-statement-cache-size>8</prepared-statement-cache-size>
<max-connections>20</max-connections>
<max-idle-time>30s</max-idle-time>
</database>
when i run this webapp , i got this exception:
java.lang.NullPointerException
at
com.caucho.amber.manager.AmberPersistenceProvider.createEntityManagerFactory(AmberPersistenceProvider.java:65)
at
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:69)
at com.abc.abc.service.VdcService.exec(VdcService.java:32)
at com.abc.abc.resources.Apply.apply(Apply.java:55)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:156)
at
com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:67)
at
com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:208)
at
com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:75)
at
com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:115)
at
com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:67)
at
com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:724)
at
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:689)
at
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:680)
at
com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:324)
at
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:425)
at
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:604)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:91)
at
com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:103)
at
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:416)
at
com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87)
at
org.apache.struts2.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:99)
at
com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87)
at
com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:187)
at
com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:265)
at
com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:273)
at com.caucho.server.port.TcpConnection.run(TcpConnection.java:682)
at com.caucho.util.ThreadPool$Item.runTasks(ThreadPool.java:743)
at com.caucho.util.ThreadPool$Item.run(ThreadPool.java:662)
at java.lang.Thread.run(Thread.java:619)
i can't solve it.How to solve it?help me ,THS
15 years, 6 months
Drools FLow Persistence and Sessions
by Chrystall, Greg
Hi,
When using persistence what is the best approach to creating sessions?
I can resume a session if the service was shutdown based on the session ID, but how often should I be creating new sessions?
Can I have multiple sessions writing to the same database?
Any guidance appreciated.
Greg
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15 years, 6 months
Nested access to process variables
by marton.bokor
Hi,
I have some process variabless passed via map in startProcess. AFAIU these
represent the current state of my process instance so what I would like to
do is compare these in a condition of a wait state node against an inserted
fact, which would be the dynamic (changing) part (Because I imagined that
this is what wait nodes are mostly good for, hope I'm right...). AFAIK this
node accepts only rule syntax (no mvel or java) so ATM I managed to do it
with eval, see code below, but it is ugly:
transaction : TransactionDAO( ) #this is the changing part
processInstance : WorkflowProcessInstance() #this is the process level
eval(
((APSSender)((BaseForm)processInstance.getVariable("form")).getDao()).getTransactionId().equals(transaction.getTransactionId())
)
As you can see the left side in eval is a nested object. In java it would
look like simply form.getDao().getTransactionId(). My question is how can I
do it with rule syntax without eval? Is it possible? I was experimenting
like a whole day with no success. Please help!
Thanks
Marton
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15 years, 6 months
error while running a dsl
by Kripa Nathwani
Hello,
I have written the following simple DSL in Drools:
[when]employee belongs to a particular state{state}=$employee:employee (statename=="{state}");
[then]Greet Employee=System.out.println("Hello");
I have also created the corresponding model with a field named "state".
When I try to create business rule for the same and when I validate the rule I get the following error:
Unable to create Field Extractor for 'statename' of '[ClassObjectType class=dslDemoPackage.employee]' in rule 'testdsl'
Let me know how I can resolve.
Best Regards,
Kripa
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______________________________________________________________________
15 years, 6 months
Drools 5.1 framework codebase
by Swapnil Sawant
Hi,
I have my application built on some framework. I am using drools 5.1 in my
app as a rule engine
and would be using drools for implementing workflow too.
I am thinking of integrating my app's framework with framework for drools
Drools is an open-source package. Hence, I would want to get the drools 5.1
framework codebase which can be setup,studied,customized and run when
needed. Also, if there is any documentation related to framework , please
share that too.
Thanks,
Swapnil Sawant
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15 years, 6 months
How to modify changeset.xml in guvnor
by rtowler1
I apologize now if this is the wrong forum, I'm a Drools noobie.
I'm trying to get the mortgage example working using jboss 5.0.1GA server
running drools 5.1.1 guvnor.
I get the 401 unauthorized http response, which is due to the 5.1 using
authentication.
I've read the posts about modifying the changeset.xml to include
authentication.
But I cannot see how to change the changeset.xml file from within Guvnor and
although the URL is given to the ChangeSet.xml file, I believe that it's
probably generated on the fly as I cannot find it in the server's
directories.
If someone could point me in the right direction for this I'd appreciate it.
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15 years, 6 months
drools-5.1.1-examples.zip out of date?
by rtowler1
Is the drools-5.1.1-examples.zip from the 5.1 downloads page to be out of
date?
I've tried importing the drools-examples into eclipse but I get the
following error
If anyone knows how to fix this it would be really appreciated.
Project build error: Non-resolvable parent POM org.drools:drools:5.1.1 for
org.drools:drools-examples-fusion:5.1.1: Failed to resolve POM for
org.drools:drools:5.1.1 due to Missing:
----------
1) org.drools:drools:pom:5.1.1
----------
1 required artifact is missing.
for artifact:
org.drools:drools:pom:5.1.1
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15 years, 6 months
