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. Besides the different notation, there is also a difference in the way that NULL values are handled by these operators. Comparing NULL values The following table shows how NULL values are handled by each comparison operator. One column presents a comparison of NULL value with a non NULL value

must be one of: TRUE, FALSE , and NULL . The following table shows how the AND operator is evaluated based on its two operands:   TRUE FALSE NULL TRUE TRUE FALSE NULL FALSE FALSE FALSE FALSE NULL NULL FALSE NULL NULL represents unknown. Therefore, if one operand is NULL and the other operand is FALSE

Hello. I'm getting NullPointerException when adding %enum field% IS (NOT) NULL or == (!=) NULL in ... () { Query query = entityManager.createQuery("SELECT e FROM TEntity e WHERE e.exampleEnum IS NULL ... values to NULL was fixed in build 2.5.5_03. support Support

Hi, So I'm currently having an issue where createEntityManagerFactory returns null . When I run ... the application I get an exception. The exception is ultimately caused by a null pointer on the line "em ... rather than an ObjectDB class), it may throw an exception but it never returns null : public static

; if (type == null ) {     throw new IllegalArgumentException(    ... the debugger is i can see this member m_idType is null type EntityTypeImpl   (id=57) m_attrMap ... SingularAttributeImpl   (id=96) m_idType null m_superType null m_sysType Class (package.Foo) (id=49) m

Hi! Is there a way to NOT prefer NULL in Order BY? I.e. assume this: @Entity class Hint {   ... hint; } I've got a few Test entries, some do have a hint assigned, some do not ( NULL ). Now when I ... } and third one to NULL : Test 3 (with hint = NULL ) Test 1 (with hint = A ) Test 2 (with hint = B) And descending: Test 2

I have a entity Person have 2 fields Name(Unique) and PhoneNumbers. I wants to allow null value ... ; Manoj Manoj Kumar Maharana ObjectDB considers a null value as any other value, so indeed, for a unique field you cannot have more than one  null value. If you need multiple null values then 

"another" is null ... in the second one "another" is set. Now I want to query " select from A where another is null OR another.counter = 0 "  What I expected to get where the 2 entities I inserted before. But I always get just the entity A were "another" is not null . Could someone help

) throws PersistenceLayerException { MyClass myclass = null ; try{ Object objectid = pm ... (JDOException jdoe){ } return myclass; } objectid is coming back as null .  Does this problem ... is to search for an ID class, and if this fails a null is returned. You can check that operation

to J2EE. parent.getChildren() returns null . Here is a simple example: Bean: @Named("test ... (); entityManager.persist(child); if (child.getParent().getChildren() == null ) { child.getParent().setChildren(new ... of the array of the child entity, the array becomes null . public class ByteData { // ... id private byte

; protected void clearOriginalValue() {         originalValue = null ... .__odbTracker != null && signalvalueimpl.__odbTracker.beforeModifyMember(1)) { signalvalueimpl ... the instanceValue!         originalValue = null ;    

including NULL , boolean literals ( TRUE and FALSE ), numeric literals (e.g. 100 ), string literals ... is always used and never replaced. The NULL literal The NULL literal represents a null value, similarly to null in Java and SQL. Since JPQL is case insensitive, NULL , null and Null are equivalent. Notice

: Sometimes! only on our server! I get a NullPointer exception, because an element is null which is! not null ... () The getLabel() throws an NullPointer because the DataElement at index 0 is not yet present and thus null ... the elements are yet not loaded from the db and thus are null ? Otherwise a cannot explain

.createEntityManager(); EntityTransaction tr = em.getTransaction(); Request r = new Request(); r.setUsername( null ... the database with username= null . the target/ directory is wiped out by `mvn clean` so i am certain ... : Attempt to reuse an existing value ( null ) (error 613) at com.objectdb.jpa.EMImpl.commit(EMImpl.java:279

Hi there. I'm new on this. trying to learn. I'm trying to make a value non nulleable. So, when I try to upload to the DB this field as null , it give me an error. I tried this, but it didn't work ... clear   Edit: Sorry. Solved. The code was working, the problem was that i'm savin an empty string "" (not null ) elnll002 Facundo Curti

 Bad - many null and 0 Values. Secound try: List resultList1 = em.createQuery("SELECT d  ... .       harald77 Harald The null and 0 values may be the result of lazy loading

.lastPosition IS NOT NULL returns no datasets. Is this a bug or am i missing something? mosi0815 Ralph ... send you a ticket with the DB. Try this query:  SELECT FROM Unit u where u.lastPosition IS NULL

Greetings, I was playing aroung with JPQL and have found that there is a problem with "is null " queries. When you use "is null " in where clause, query runs correctly, but results are incorrect. Let me show you an example: - entity @Entity public class EntityA {     @Id  

I have the following stack trace.  Is this a null ptr in our code or in the object db code? Failed to commit transaction:  (error 613) at com.objectdb.jpa.EMImpl.commit(EMImpl.java:279 ... to persist (indirectly via cascading) an object with a null primary key. Build 2.4.4_17 may provide a better error message in this case. support Support

the following commands: The Edit Set Reference Set to Null command is used to set a reference to null ... the value to null without deleting any referenced entity object. On the other hand, deleting ... the following commands: The Edit Add to Collection Add Null command is used to add a null value. The Edit Add

the database every persistent field must contain either null or a value of one of the supported ... a generic java.lang.Object , as long as the type of the actual value at runtime is persistable (or null ... above demonstrates using field and relationship annotations to change the default behavior. null values

inner value it gets at least a  NULL value as a matching value in the FROM iteration. Therefore, a Country c with no Capital city has a minimum representation of (c, NULL ) in the FROM iteration ... variant returns Nauru with a NULL value as its capital. [LEFT [OUTER] | INNER] JOIN FETCH JPA support

). Navigation through a NULL value The following query retrieves country names with their capital city names ... Nauru, c.capital is evaluated to NULL and c.capital.name is an attempt to navigate from a NULL value. In Java, a NullPointerException is thrown on any attempt to access a field or a method via a null

with default values ( 0 , false or null ). Fields in the old schema that do not have matching fields in ... with a default value ( 0 , false or null ). The following type conversions are supported: From any numeric ... boolean ( 0 , null and false are converted to false , any other value is converted to true ). From

every indexed field must contain either null or a value of one of the following persistable types ... values of the above types (including null ). Indexes can only be defined on ordinary persistent

null is returned. A similar method, getReference , can be considered the lazy version of find ... might be returned ( null is never returned). A hollow object is initialized with the valid primary key

their values (i.e. elements in collections and arrays and keys and values in maps) are either null

: =, , =, IS [NOT] NULL , [NOT] BETWEEN, including  Collection operators: [NOT] IN, IS [NOT] EMPTY

to null or to another Address object. If orphanRemoval=true is specified the disconnected Address

Customer spouse = null ;     private Date dateOfBirth = null ;     private String firstName = null ;     private String lastName = null ;     private String personalNumber = null ;     private String street = null ;   

via a querying @EJB gives many fields null (and not even empty, I mean truly null ). In ... simple @OneToOne relationship fields that likewise become null : private List ownedElements = new ... .greensoft.entity.test.TestDeepValues [ null ](TEST: test deep values) INFO: RequestBean []: Persisted

.ArrayIndexOutOfBoundsException: null java.lang.ArrayIndexOutOfBoundsException at java.lang.System.arraycopy(Native Method) at com ... ,owner); return t; } catch (InstantiationException ex) { logger.log(Level.SEVERE, null , ex); } catch (IllegalAccessException ex) { logger.log(Level.SEVERE, null , ex); } catch (IllegalArgumentException

in the related objects is set to null . This is highly critical because it will cause data loss ... (fetch = FetchType. EAGER ) @Enumerated(EnumType. STRING ) private List roles = null ; itsme Martin ... ) and the value is null . itsme Martin Petzold  Could this be the case because the enum type

are null (i.e. references actions, childNodes), even after a subsequent refresh. we are using a separate ... definitions are (for the null references above): ... @OneToMany(fetch=FetchType.LAZY) @Index public ... that have not been loaded with null values. Detached objects cannot be refreshed. Does it happen

;   hgzwicker Hans-Georg Zwicker More information is needed about this NULL reference ... such null references do you have? Do you have any idea what operation could be related to these specific actions that made them NULL ? support Support Is there new information regarding this null

to it. If nothing has yet been persisted, or if the odb file is not newly created, getSequence() returns null . Code ... = pm.getSequence("seq"); // per JDO spec, it should be testcase.seq if (seq1 == null ) System.out.println("getSequence 1 returned null "); // it should never be null pm.currentTransaction().begin

"is not null "-queries are not working correctly for indexed fields. Following SSCCE creates 1000 entities. A null value is assigned to an indexed field for every second entity. When doing count-queries at the end, wrong results are fetched. import java.io.Serializable; import javax.jdo.annotations

.NullPointerException: null java.lang.NullPointerException at com.objectdb.o.VAR.S(VAR.java:297 ... .createQuery(q);     List reportDownloadObjects = null ;     try

JDO Enum Constant in javax.jdo.annotations.ForeignKeyAction NULL Since: JDO 2.1

demonstrated by field f6 . null -value (exception | none | default) The null -value attribute is also intended for persistent reference fields. It indicates whether the field can accept null values or not ... attempt to store a persistent object with a null value in that field. If the null -value attribute

by strings). If getObjectID( ... ) is called with a transient parameter, it returns null ... string, but also a Class instance. ObjectDB ignores the first argument. Therefore, a null value ... yet (and may be seen as null values in the debugger). When an access to another persistent object

' , ... string "", " ", "abcd\n1234" , ... boolean true, false reference null   As shown in ... , a NullPointerException is thrown on any attempt to access a field or a method using a null reference. JDOQL behavior is different. An attempt to access a field or invoke a method using a null reference

name = request.getParameter("name"); if (name != null ) guestDao.persist(new Guest(name

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

"); if (name != null ) guestDao.persist(new Guest(name)); // Prepare the result view (guest.jsp): return

("name"); if (name != null ) guestDao.persist(new Guest(name)); // Display the list of guests: doGet

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

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

, to an exiting object or to null . You can add objects or references to a persistent collection using ... . Deleting a reference field sets the value to null without deleting any referenced persistent object

) must have a reference to an object whose type is persistent at storage time, e.g. an Integer , or null ... values ( 0 , false or null ). Old persistent fields that are missing in the new class are just