About null

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Manual
13

JPA Entity Fields

. When an entity object is stored in the database every persistent field must contain either null or a value ... is persistable (or null). Every persistent field can be marked with one of the following annotations ... the default behavior. null values are allowed by default. Specifying optional=false (as demonstrated
Manual
11

Database Schema Evolution

with default values (0, false or null). Fields in the old schema that do not have matching fields in the new ... with a default value (0, false or null). The following type conversions are supported: From any numeric type ... that are stored as numeric ordinal values (the default). From any type to Boolean or boolean (0, null
JPA Doc
10

javax.persistence.criteria.CriteriaBuilder

an expression that returns null if all its arguments evaluate to null, and the value of the first non-null argument otherwise. Create an expression that returns null if all its arguments evaluate to null, and the value of the first non-null argument otherwise. Parameters: x - expression y - value Returns
Manual
9

Index Definition

. When an entity object is stored in the database every indexed field must contain either null or ... . Arrays and collections that contain values of the above types (including null). Indexes
Manual
9

Retrieving JPA Entity Objects

with that retrieved data is constructed and returned. If the object is not found in the database null ... might be returned (null is never returned). A hollow object is initialized with the valid primary key
Issue
9

Issue with UPPER ?

.communication $6 WHERE (((NOT (($2 IS NOT NULL) AND ($2.austritt IS NOT NULL) AND ($2.austritt<=CURRENT_DATE)))) AND (((($3 IS NOT NULL) AND ($4 IS NOT NULL) AND ($4.name IS NOT NULL) AND ($4.name LIKE '%81%')) OR (($5 IS NOT NULL) AND ($5.postalCode IS NOT NULL) AND ($5.postalCode LIKE '%81%')) OR
Result
8

java.lang.Exception

with null as its detail message. Constructs a new exception with null as its detail message. The cause ... ) Constructs a new exception with the specified cause and a detail message of (cause==null ? null ... exception with the specified cause and a detail message of (cause==null ? null : cause.toString
Result
8

java.lang.Throwable

Throwable() Constructs a new throwable with null as its detail message. Constructs a new throwable with null as its detail message. The cause is not initialized, and may subsequently be initialized by ... cause and a detail message of (cause==null ? null : cause.toString()) (which typically contains
JDO Doc
7

javax.jdo.spi.JDOImplHelper

of DocumentBuilderFactory. Returns: the DocumentBuilderFactory if registered; null otherwise Since: JDO 2.1 ErrorHandler ... instance of ErrorHandler. Returns: the registered ErrorHandler if registered; null otherwise Since: JDO ... . Returns: The PersistenceCapable superclass for this class, or null if there isn't one. Since: JDO 1
JDO Doc
7

javax.jdo.spi.StateInterrogation

StateInterrogation returns Boolean. If the return value is null then the StateInterrogation does not recognize the parameter as being handled by it. A non-null return value indicates ... registered StateInterrogation is given the parameter until one of them returns a non-null value