[Design of JBoss jBPM] - delayed execution
by tom.baeyens＠jboss.com
Alejandro visited the belgian office recently. And as usual, he brought some very interesting ideas.
He pinpointed a potential problem in the process virtual machine: the call stack can grow too much with the current nested invocations. I thought that never more then 5 nodes would be executed in one go. But he pointed out that in loops this might go deeper.
I have a prototype working with delayed execution so that the nested call stack doesn't grow. it's configurable in the nodes wether a node doesn't mind delayed execution (default) or wether execution must be synchronous. As long as the behaviour implementations of nodes don't have anything between the proceed method invoation and the end of the method, the process interpretation is exactly the same, delayed and non-delayed.
Probably this will make it in 4.0.
The test is in the lightning module, test/org/jbpm/pvm/DelayTest.java It shows the sequence of execution that could be affected (if something is done between the proceed invocation and the end of the execute method). And it shows that the callstack doesn't grow in case of delayed execution of a while loop and that the same while loop generates a StackOverflowError in case of synchronous execution of this while loop.
cool, huh ? :-)
THANKS, Alejandro!
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17 years, 6 months
[Design of JBoss jBPM] - Re: Problem in deploying the processDefinition.xml
by anu123suya
Thanks..
In my Jboss server there are 2 ehcache jar jn both Portal.sar and JBPM.sar.
so i removed ehcache from portal.sar.
but even now i am getting the following exception. please could you let me know the root cause of the problem
java.lang.IllegalAccessError: tried to access method net.sf.ehcache.CacheManager
.()V from class org.hibernate.cache.EhCacheProvider
at org.hibernate.cache.EhCacheProvider.start(EhCacheProvider.java:124)
at org.hibernate.impl.SessionFactoryImpl.(SessionFactoryImpl.java:
180)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.jav
a:1213)
at org.jbpm.persistence.db.DbPersistenceServiceFactory.getSessionFactory
(DbPersistenceServiceFactory.java:90)
at org.jbpm.persistence.db.DbPersistenceService.getSessionFactory(DbPers
istenceService.java:74)
at org.jbpm.persistence.db.DbPersistenceService.getSession(DbPersistence
Service.java:78)
at org.jbpm.persistence.db.DbPersistenceService.getGraphSession(DbPersis
tenceService.java:217)
at org.jbpm.JbpmContext.getGraphSession(JbpmContext.java:537)
at org.jbpm.JbpmContext.deployProcessDefinition(JbpmContext.java:173)
at org.apache.jsp.Testdeploy_jsp._jspService(Testdeploy_jsp.java:51)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:332)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
14)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFi
lter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:178)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(Securit
yAssociationValve.java:175)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValv
e.java:74)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.p
rocessConnection(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpo
int.java:527)
at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWor
kerThread.java:112)
at java.lang.Thread.run(Thread.java:534)
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17 years, 6 months
[Design of JBoss jBPM] - Problem in deploying the processDefinition.xml
by anu123suya
I am a newbie to JBPM 3.1.2 and need to deploy a simple processdefinition to the Jboss app server and hsql db.
Took the jbpm.sar and the db script from the starter kit.
I tried the following deployment ways
1. When tried to deploy the process definition from eclipse, I got a succes msg. but the Database tables for this process is not updated.
2. When I tried to deploy it programmaticaly with the following code,
JbpmConfiguration jbpmConfig = JbpmConfiguration.getInstance();
JbpmContext jbpmContext = jbpmConfig.createJbpmContext();
ProcessDefinition processDefinition = ProcessDefinition.parseXmlResource("META-INF/processdefinition.xml");
jbpmContext.deployProcessDefinition(processDefinition);
getting the following exception.
Can anyone suggest me the steps to deploy the processdefinition.xml and invocation of the process.
Thanks
java.lang.NullPointerException
at net.sf.ehcache.CacheManager.detectAndFixDiskStorePathConflict(CacheMa
nager.java:269)
at net.sf.ehcache.CacheManager.configure(CacheManager.java:252)
at net.sf.ehcache.CacheManager.init(CacheManager.java:196)
at net.sf.ehcache.CacheManager.(CacheManager.java:183)
at org.hibernate.cache.EhCacheProvider.start(EhCacheProvider.java:124)
at org.hibernate.impl.SessionFactoryImpl.(SessionFactoryImpl.java:
180)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.jav
a:1213)
at org.jbpm.persistence.db.DbPersistenceServiceFactory.getSessionFactory
(DbPersistenceServiceFactory.java:90)
at org.jbpm.persistence.db.DbPersistenceService.getSessionFactory(DbPers
istenceService.java:74)
at org.jbpm.persistence.db.DbPersistenceService.getSession(DbPersistence
Service.java:78)
at org.jbpm.persistence.db.DbPersistenceService.getGraphSession(DbPersis
tenceService.java:217)
at org.jbpm.JbpmContext.getGraphSession(JbpmContext.java:537)
at org.jbpm.JbpmContext.deployProcessDefinition(JbpmContext.java:173)
at org.apache.jsp.Testdeploy_jsp._jspService(Testdeploy_jsp.java:51)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:332)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
14)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFi
lter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:178)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(Securit
yAssociationValve.java:175)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValv
e.java:74)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.p
rocessConnection(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpo
int.java:527)
at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWor
kerThread.java:112)
at java.lang.Thread.run(Thread.java:534)
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17 years, 6 months