About number



Thrown by the persistence provider when a query times out and only the statement is rolled back.(Exception of JPA)


Blocked by find

I have a container object which wraps an objectdb database. There is a "putIfAbsent(String id, Object obj)" method which is synchronized and attempts to load an object by id using the EntityManager "find" method. If nothing is returned from the db the passed object is persisted to the db. I have 5 threads which use this method. In a run today one of the threads seems to have got stuck somewhere in the find. The thread dump looks like: ... cache for the main application - access is typically a number of persists as a request enters the system, several gets as the request ...



The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.(Exception of java.langException Exception)


Suspected memory leak

Hi, We are running soak testing with Object DB and it is showing signs of memory leak: used memory is growing overtime until Object DB JVM fails with OutOfMemoryException. Object DB is running in a separate JVM. All the config is attached. We are continuing to investigate this and will create memory dump next time this happens. In the meantime, could you please check if there is anything wrong with our configuration? Kind regards, Natalia. ... The <processing> element - try reducing the number of threads and the cache size (notice that this setting is per open ...


Comparison in JPQL and Criteria API

Explains how comparison operators can be used in JPQL queries, including in comparing null values. Most JPQL queries use at least one comparison operator in their WHERE clause. This page covers the following topics: Comparison Operators Comparing NULL values IS [NOT] NULL Comp ...



Thrown by the persistence provider when a transaction is required but is not active.(Exception of JPA)



Thrown by the persistence provider when EntityTransaction.commit() fails.(Exception of JPA)



Thrown by the persistence provider when Query.getSingleResult() or TypedQuery.getSingleResult()is executed on a query and there is no result to return.(Exception of JPA)



This class is a helper class for JDO implementations.(Class of JDO)



Thrown by the persistence provider when Query.getSingleResult() or TypedQuery.getSingleResult() is executed on a query and there is more than one result from the query.(Exception of JPA)