OK, I reviewed forum topics and documentation. What I found is : process data is stored using hibernate, to use ejb transactions I need to set DbPersistenceServiceFactory properties "isTransactionEnabled" to false and "sessionFactoryJndiName" to correct one. While jbpm objects are not thread safe I must use them in a single thread (one object per thread). I use jboss-4.0.3SP1 with ejb3.0. The questions I still have are : does hibernate locks properly process instances on single server and uses hibernate cluster-wide cache to prevent concurrent modification of same process instance ? Or what settings I should modify to get it works ?
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