Finding ActionHandlers from within a JbpmService

[wasperen]

I have a running JbpmService in my JBoss Application Server 4. This service is started in the AS at start-up and available through JNDI under name "java:/jbpm/JbpmConfiguration".

A webapplication (deployed through a .war file) at some point kicks off the execution of a new process. This process uses a number of ActionHandlers. Result:

13:38:49,651 ERROR [Delegation] couldn't load delegation class '....CreateNewItemHandler'
java.lang.ClassNotFoundException: class '....CreateNewItemHandler' could not be found by the process classloader

This does make sense because the *.class files for these ActionHandlers are only defined in the .war file. Sticking them into a .jar, placing that in the /server/default/lib folder helps. Now they can be found... But that is not fair!

In my mind any application specific classes should be isolated into the .war file. How can I tell the JbpmService to also look into /WEB-INF/classes?

Thanks,
Willem

[kukeltje]

afaik you should not use the .sar soultion then, but include the jbpm jar in the .war file. This is not a jBPM issue, but a j2ee classloader spec thing.

Another solution is to 'go against the spec' and to turn on UCL in JBoss AS. (I hope this works, have not tested it)

[wasperen]

So there is no way of letting jBPM know where to look for these classes?

[kukeltje]

Not yet, the classloader is not extensible, or overridable. There are some remarks in the code to make it more even more flexible than it is now.

Soest, close by, I live in Utrecht and work in Zeist

[wasperen]

Ah, well... Too bad...

Yeah, Zeist and Soest are only separated by the military airbase Soesterberg --

My work base is Nieuwegein, next to Utrecht.

Thanks anyway,
Regards,
Willem

[kukeltje]

Ordina?

[wasperen]

Nope.
PA Consulting Group

Management Consultancy -- what does this SOA and BPEL mean for me as a CEO or CIO. That kind of stuff.

[kukeltje]

Interesting...

but http://www.pa-consulting.com/ show me

Advanced Server Hosting
Demon Internet Monitoring Site

[wasperen]

Hmmmmm....

Look at http://www.paconsulting.com that'll do the trick.

willem

[kukeltje]

I thought that was a different company since there was no info on bpel on that site. But there is infor on soa. www.paconsulting.nl is wrong as well

[wasperen]

I know. It's one of our many many focus areas...
You with a software company in Zeist?

[tom.baeyens]

This is because we use the classloader that loads the jbpm classes as a parent:

public static ClassLoader getClassLoader() {
return ClassLoaderUtil.class.getClassLoader();
}

In case of the default .sar packaging on JBoss, the .sar classloader will not see your .war classes.

One thing on our todo is make the parent classloader configurable.

http://jira.jboss.com/jira/browse/JBPM-653

If you would be able to specify the context classloader (Thread.currentThread().getContextClassLoader()), then your problem would be solved, i guess.

A workaround option is not to use the .sar packaging to deploy jBPM, but rather to include the jbpm libs (the ones in the .sar) into your .war file.

[kukeltje]

Willem,

send me a message at ronald apestaartje jbpm punt org and I'll tell you some more

[hosierdm]

A workaround option is not to use the .sar packaging to deploy jBPM, but rather to include the jbpm libs (the ones in the .sar) into your .war file.

I tried this solution with the jbpm war by sticking the 4 jar files into jbpm.war/WEB-INF/lib, and it does not work. I just get a continuous loop of ClassNotFoundExceptions. The following set of log entries just keeps repeating in a loop:

14:35:38,757 INFO [Configuration] processing extends queue
14:35:38,757 INFO [Configuration] processing collection mappings
14:35:38,757 INFO [Configuration] processing association property references
14:35:38,757 INFO [Configuration] processing foreign key constraints
14:35:38,773 INFO [NamingHelper] JNDI InitialContext properties:{}
14:35:38,773 INFO [DatasourceConnectionProvider] Using datasource: java:/LsftSasJbpmDS
14:35:38,773 INFO [SettingsFactory] RDBMS: Oracle, version: Oracle Database 10g Release 10.2.0.1.0 - Production
14:35:38,773 INFO [SettingsFactory] JDBC driver: Oracle JDBC driver, version: 10.2.0.1.0
14:35:38,773 INFO [Dialect] Using dialect: org.hibernate.dialect.Oracle9Dialect
14:35:38,773 INFO [TransactionFactoryFactory] Using default transaction strategy (direct JDBC transactions)
14:35:38,773 INFO [TransactionManagerLookupFactory] No TransactionManagerLookup configured (in JTA environment, use of read-write or transactional second- level cache is not recommended)
14:35:38,773 INFO [SettingsFactory] Automatic flush during beforeCompletion(): disabled
14:35:38,773 INFO [SettingsFactory] Automatic session close at end of transaction: disabled
14:35:38,773 INFO [SettingsFactory] JDBC batch size: 15
14:35:38,773 INFO [SettingsFactory] JDBC batch updates for versioned data: disabled
14:35:38,773 INFO [SettingsFactory] Scrollable result sets: enabled
14:35:38,773 INFO [SettingsFactory] JDBC3 getGeneratedKeys(): enabled
14:35:38,773 INFO [SettingsFactory] Connection release mode: auto
14:35:38,773 INFO [SettingsFactory] Default batch fetch size: 1
14:35:38,773 INFO [SettingsFactory] Generate SQL with comments: disabled
14:35:38,773 INFO [SettingsFactory] Order SQL updates by primary key: disabled
14:35:38,773 INFO [SettingsFactory] Query translator: org.hibernate.hql.ast.ASTQueryTranslatorFactory
14:35:38,773 INFO [ASTQueryTranslatorFactory] Using ASTQueryTranslatorFactory
14:35:38,773 INFO [SettingsFactory] Query language substitutions: {}
14:35:38,789 INFO [SettingsFactory] Second-level cache: enabled
14:35:38,789 INFO [SettingsFactory] Query cache: disabled
14:35:38,789 INFO [SettingsFactory] Cache provider: org.hibernate.cache.EhCacheProvider
14:35:38,789 ERROR [CommandExecutorThread] java.lang.NoClassDefFoundError: net/sf/ehcache/CacheException
14:35:43,789 INFO [STDOUT] Exception in thread "JbpmScheduler"
14:35:43,789 INFO [STDOUT] java.lang.NoClassDefFoundError: net/sf/ehcache/CacheException
14:35:43,789 INFO [STDOUT] at java.lang.Class.getDeclaredConstructors0(Native Method)
14:35:43,789 INFO [STDOUT] at java.lang.Class.privateGetDeclaredConstructors(Class.java:2328)
14:35:43,789 INFO [STDOUT] at java.lang.Class.getConstructor0(Class.java:2640)
14:35:43,789 INFO [STDOUT] at java.lang.Class.newInstance0(Class.java:321)
14:35:43,789 INFO [STDOUT] at java.lang.Class.newInstance(Class.java:303)
14:35:43,789 INFO [STDOUT] at org.hibernate.cfg.SettingsFactory.createCacheProvider(SettingsFactory.java:327)

[kukeltje]

if you just include the four jbpm jars in the war, you still have to make sure all other ruiquired jars are on the classpath (in this example the ehcache jar)