jBPM seems to use semantic versioning, however, 6.2.0.Final brings some changes that aren't backward compatible with the 6.1.0.Final API and dependencies. Especially if you're using persistence.

API

public JPATaskLifeCycleEventListener()

has been changed to:

public JPATaskLifeCycleEventListener(boolean flag);

There is no documentation about this flag and it has no purpose in the latest version.

Dependencies

If you were carefully adding only the necessary dependencies to your project, after fixing the compile-time errors you'll run into this:

java.lang.NoSuchMethodError: org.hibernate.cfg.Configuration.getNamingStrategyDelegator()Lorg/hibernate/cfg/naming/NamingStrategyDelegator;
  at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:1066)
  at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:295)
  at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:376)
  at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:58)
  at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63)

Version 6.1.0.Final was happy with a single hibernate dependency:

<dependency>
  <groupId>org.hibernate</groupId>
  <artifactId>hibernate-core</artifactId>
  <version>4.2.3.Final</version>
</dependency>

while 6.2.0.Final requires two other dependencies:

<dependency>
  <groupId>org.hibernate</groupId>
  <artifactId>hibernate-entitymanager</artifactId>
  <version>4.3.7.Final</version>
</dependency>
<dependency>
  <groupId>org.hibernate.javax.persistence</groupId>
  <artifactId>hibernate-jpa-2.0-api</artifactId>
  <version>1.0.1.Final</version>
</dependency>

If there is something more what you can't find on the list, let me know and I'll add it.