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About activation

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JPA Doc
8

JPA Exceptions

, an attempt to update the database with no active transaction is represented by: Database update
Manual
8

JPA Lifecycle Events

throws an exception within an active transaction, the transaction is marked for rollback
Manual
8

JPA Persistable Types

the original classes and enable transparent activation and transparent persistence. For example
Result
8

ObjectDB License

days of the purchase date, provided that you haven't activated your license. Server License ObjectDB
Manual
8

Running JPA Queries

").executeUpdate(); A TransactionRequiredException is thrown if no transaction is active. On success
Tutorial
8

Step 4: Add a Servlet Class

the transaction if still active) is closed. The next step is adding a JSP page that will produce the guestbook page output.
Tutorial
8

Step 4: Add a Servlet Class

the page output. Finally, the database connection (including the transaction if still active) is closed
Manual
8

SELECT clause (JPQL / Criteria API)

are not associated with an EntityManager and changes to them when a transaction is active are not
Issue
8

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
5

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