About null

71-80 of 200Refresh
JPA Doc
7

javax.persistence.PessimisticLockException

() Constructs a new PessimisticLockException exception with null as its detail message. Constructs a new PessimisticLockException exception with null as its detail message. Since: JPA 2.0 ... () Throwable getCause() Returns the cause of this throwable or null if the cause is nonexistent or unknown
JPA Doc
7

javax.persistence.QueryTimeoutException

2.0 QueryTimeoutException() Constructs a new QueryTimeoutException exception with null as its detail message. Constructs a new QueryTimeoutException exception with null as its detail message ... the cause of this throwable or null if the cause is nonexistent or unknown. Returns the cause
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
6

JPA Query Expressions (JPQL / Criteria)

: =, <>, <, <=,>, >=, IS [NOT] NULL, [NOT] BETWEEN, including Collection operators: [NOT] IN, IS [NOT] EMPTY, [NOT
Tutorial
6

Step 5: Add a JSP Page

> guests = (List)request.getAttribute("guests"); if (guests != null
Tutorial
6

Step 4: Add a Servlet Class

a new guest: String name = request.getParameter("name"); if (name != null
Tutorial
6

Step 4: Add a Controller Class

): String name = request.getParameter("name"); if (name != null
Manual
6

Deleting JPA Entity Objects

, such as when setting the address field to null or to another Address object. If orphanRemoval=true
Tutorial
6

Step 4: Add a Servlet Class

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