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JPA Doc
7

javax.persistence.RollbackException

RollbackException exception with null as its detail message. Constructs a new RollbackException exception with null as its detail message. Since: JPA 1.0 RollbackException(String message) Constructs a new ... the cause of this throwable or null if the cause is nonexistent or unknown. Returns the cause
JPA Doc
7

javax.persistence.TransactionRequiredException

TransactionRequiredException exception with null as its detail message. Constructs a new TransactionRequiredException exception with null as its detail message. Since: JPA 1.0 TransactionRequiredException(String ... () Throwable getCause() Returns the cause of this throwable or null if the cause is nonexistent or unknown
Manual
7

Deleting JPA Entity Objects

, such as when setting the address field to null or to another Address object. If orphanRemoval=true
Manual
7

JPA Persistable Types

and arrays and keys and values in maps) are either null values or instances of persistable types. In
Manual
7

JPA Query Expressions (JPQL / Criteria)

: =, <>, <, <=,>, >=, IS [NOT] NULL, [NOT] BETWEEN, including Collection operators: [NOT] IN, IS [NOT] EMPTY, [NOT
Tutorial
7

Step 4: Add a Controller Class

): String name = request.getParameter("name"); if (name != null
Tutorial
7

Step 4: Add a Controller Class

(if any): String name = request.getParameter("name"); if (name != null
Tutorial
7

Step 4: Add a Servlet Class

): String name = request.getParameter("name"); if (name != null
Tutorial
7

Step 4: Add a Servlet Class

.getParameter("name"); if (name != null) { em.getTransaction().begin
Tutorial
7

Step 4: Add a Servlet Class

a new guest: String name = request.getParameter("name"); if (name != null