About Container

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JPA Doc
101

contains(cls, primaryKey)

Method javax.persistence.Cache boolean contains(   Class cls,   Object primaryKey ) Whether the cache contains data for the given entity. Parameters: cls - entity class primaryKey - primary key Returns: boolean indicating whether the entity is in the cache Since: JPA 2.0
JPA Doc
100

contains(entity)

Method javax.persistence.EntityManager boolean contains(   Object entity ) Check if the instance is a managed entity instance belonging to the current persistence context. Parameters: entity - entity instance Returns: boolean indicating if entity is in persistence context Throws: IllegalArgumentException - if not an entity Since: JPA 1.0
Manual
61

Working with JPA Entity Objects

soft references instead of weak references. The contains method can check if a specified entity object is in the persistence context: boolean isManaged = em.contains(employee); The persistence
Tutorial
57

Java EE Web Tutorial

. If you need a web application that can run on a simple servlet container (such as Tomcat or Jetty
Manual
57

Shared (L2) Entity Cache

is cached: boolean isCached = cache.contains(MyEntity.class, Long.valueOf(id)); Cached entity
Tutorial
49

Eclipse/JPA Java EE Tutorial

Step by step tutorial that demonstrates how to build a simple Java EE web application (with Servlet, JSP and an EJB Session Bean) in Eclipse using JPA.
Tutorial
49

NetBeans/JPA Java EE Tutorial

Step by step tutorial that demonstrates how to build a simple Java EE web application (with Servlet, JSP and an EJB Session Bean) in NetBeans using JPA.
Issue
34

InternalException when querying indexed field using a list that contains duplicates

the specific case when: A query filter like this is used: ":ids.contains(originalId)" originalId is an indexed String field on the candidate class :ids is a list which contains a duplicate entry If the field is unindexed, or :ids does not contain duplicates, the exception is not thrown and the query
Forum
34

String Contains Query Result - Possible?

Hi, I have a managed database for an Entity, "Program", containing a String field, "description ... , the only solution I have is to iterate over all the Program objects manually and find one that is contained ... ) { for(Program p : allPrograms()) if(desc.contains(p.getDescription())) return p; return null
Forum
33

Memory error during commit, if @ElementCollection field contains many elements

> values = new HashMap<>(); The element collection contains more than 10.000 elements ... classes. Every TCStep will reference a new entity object that will contain the collection