About activator

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JDO Doc
11

javax.jdo.PersistenceManagerFactory

addFetchGroups( FetchGroup... groups) Add the FetchGroups to the set of active fetch groups. Add the FetchGroups to the set of active fetch groups. FetchGroups are made unmodifiable before being added ... to see that all PersistenceManager instances obtained from this PersistenceManagerFactory have no active
JPA Doc
10

JPA Exceptions

, an attempt to update the database with no active transaction is represented by: Database update
Tutorial
10

Step 4: Add a Servlet Class

, the database connection (including the transaction if still active) is closed. The next step is adding a JSP page that will produce the guestbook page output.
Tutorial
10

Step 4: Add a Servlet Class

if still active) is closed. The next step is adding a JSP page that will produce the guestbook page output.
Manual
10

SELECT clause (JPQL / Criteria API)

are not associated with an EntityManager and changes to them when a transaction is active are not
Manual
10

Running JPA Queries

if no transaction is active. On success - the executeUpdate method returns the number of objects
Manual
10

JPA Lifecycle Events

throws an exception within an active transaction, the transaction is marked for rollback
Manual
10

JPA Persistable Types

the original classes and enable transparent activation and transparent persistence. For example
Issue
10

Explorer bug ? Objects seem to be missing from database in Class view, but are present as references

1st project)) INFO: RequestBean []: Created: com.greensoft.entity.Activity [null](TEST: the 1st activity) INFO: RequestBean []: Persisted: com.greensoft.entity.Activity [14](TEST: the 1st activity) INFO: RequestBean []: Created: com.greensoft.entity.Activity [null](TEST: the 2nd activity) INFO
JPA Doc
6

javax.persistence.EntityManager

). If this method is called when the entity manager is associated with an active transaction, the persistence ... IllegalArgumentException - if the instance is not a managed entity and a transaction is active Since: JPA 2.0 ... () Indicate to the entity manager that a JTA transaction is active. Indicate to the entity manager