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java Programming Glossary: identityUsing a byte array as HashMap key (Java) http://stackoverflow.com/questions/1058149/using-a-byte-array-as-hashmap-key-java this question The problem is that byte uses object identity for equals and hashCode so that byte b1 1 2 3 byte b2 1 2 3..
Difference between DTO, VO, POJO, JavaBeans? http://stackoverflow.com/questions/1612334/difference-between-dto-vo-pojo-javabeans tell them because their notion of equality isn't based on identity instead two value objects are equal if all their fields are..
equals and hashcode in Hibernate http://stackoverflow.com/questions/1638723/equals-and-hashcode-in-hibernate base equals hashCode on primary key IF it's set and object identity System.identityHashCode otherwise. The important part here is.. on primary key IF it's set and object identity System.identityHashCode otherwise. The important part here is that you need..
Why does 128==128 return false but 127==127 return true in this code? http://stackoverflow.com/questions/1700081/why-does-128-128-return-false-but-127-127-return-true-in-this-code but rather to comform to the JLS section 5.1.7 object identity must be given for values 128 to 127 inclusive. share improve..
Java Arrays.equals() returns false for two dimensional arrays http://stackoverflow.com/questions/2721033/java-arrays-equals-returns-false-for-two-dimensional-arrays as follows For arrays equals is defined in terms of object identity System.out.println new int 1 2 .equals new int 1 2 prints false.. definition since an int has its equals defined by object identity . java.util.Arrays.deepEquals is deep In contrast here's what..
Is it guaranteed that new Integer(i) == i in Java? http://stackoverflow.com/questions/2831945/is-it-guaranteed-that-new-integeri-i-in-java last line will ALWAYS prints false we're using reference identity comparison and a new object will NEVER be to an already existing.. the primitive would be auto boxed instead and reference identity comparisons are performed which would all then be false java..
What is the difference between “text” and new String(“text”) in Java? http://stackoverflow.com/questions/3052442/what-is-the-difference-between-text-and-new-stringtext-in-java s1.equals s2 true on two reference types is a reference identity comparison. Two objects that are equals are not necessarily..
Why does int num = Integer.getInteger(“123”) throw NullPointerException? http://stackoverflow.com/questions/3123349/why-does-int-num-integer-getinteger123-throw-nullpointerexception compares two boxed primitives with the operator it does an identity comparison which is almost certainly not what you want. When..
http://stackoverflow.com/questions/3130311/weird-integer-boxing-in-java this formulation disallows any assumptions about the identity of the boxed values on the programmer's part. This would allow..
http://stackoverflow.com/questions/3553200/hibernate-different-object-with-the-same-identifier-value-was-already-associate is rolebean#1 has been saved twice in a session and their identity is the same. In the function save E e If I use session.merge..
The JPA hashCode() / equals() dilemma http://stackoverflow.com/questions/5031614/the-jpa-hashcode-equals-dilemma on the primary key hashCode equals are broken correct identity for all managed entities problems with detached entities Override.. what about foreign keys hashCode equals are broken correct identity for all managed entities no problems with detached entities.. some more discussions and or opinions. java hibernate jpa identity eclipselink share improve this question I always override..
Integer wrapper objects share the same instances only within the value 127? http://stackoverflow.com/questions/5117132/integer-wrapper-objects-share-the-same-instances-only-within-the-value-127 this formulation disallows any assumptions about the identity of the boxed values on the programmer's part. This would allow..
How are SSL certificate server names resolved/Can I add alternative names using keytool? http://stackoverflow.com/questions/8443081/how-are-ssl-certificate-server-names-resolved-can-i-add-alternative-names-using of type dNSName is present that MUST be used as the identity. Otherwise the most specific Common Name field in the Subject..
What is the proper way to re-attach detached objects in Hibernate? http://stackoverflow.com/questions/912659/what-is-the-proper-way-to-re-attach-detached-objects-in-hibernate to a hibernate session although an object of the same identity MAY already exist in the session which will cause errors. Right..
Difference Between Equals and == http://stackoverflow.com/questions/971954/difference-between-equals-and and b are reference types In Java will always compare for identity i.e. whether the two values are references to the same object... .NET and Java the implementation in Object also checks for identity. Note that this depends on the execution time type rather than..
Why is Multiple Inheritance not allowed in Java or C#? http://stackoverflow.com/questions/995255/why-is-multiple-inheritance-not-allowed-in-java-or-c impacts casting layout dispatch field access serialization identity comparisons verifiability reflection generics and probably lots..
Java/Hibernate JPA: InheritanceType.TABLE_PER_CLASS and IDs http://stackoverflow.com/questions/3154649/java-hibernate-jpa-inheritancetype-table-per-class-and-ids they are bidirectional. This strategy does not support the IDENTITY generator strategy the id has to be shared across several tables... when using this strategy you should not use AUTO nor IDENTITY . So I'm afraid what you want is not supported and I suggest..
http://stackoverflow.com/questions/352673/whats-the-best-way-to-update-a-single-record-via-sql-and-obtain-the-id-of-the-re dbo . TEST_TABLE GO CREATE TABLE dbo . TEST_TABLE id int IDENTITY 1 1 NOT NULL name nvarchar 100 COLLATE SQL_Latin1_General_CP1_CI_AS..
Hibernate @generatedvalue for HSQLDB http://stackoverflow.com/questions/3596848/hibernate-generatedvalue-for-hsqldb understanding incorrect It does in theory it defaults to IDENTITY with HSQLDB and it works for me. This begs the following questions.. set it as primary key. Then you have your answer use an IDENTITY column. While Hibernate does choose the right strategy and does.. null into the id which is expected to be persisted into an IDENTITY column it won't create or alter your physical model if you don't..
http://stackoverflow.com/questions/3739387/javax-persistence-persistenceexception-no-persistence-provider-for-entitymanage sequences . I suggest using the AUTO strategy defaults to IDENTITY with MySQL . To do so remove the SequenceGenerator annotation..
How to annotate MYSQL autoincrement field with JPA annotations http://stackoverflow.com/questions/4102449/how-to-annotate-mysql-autoincrement-field-with-jpa-annotations a MySQL AUTO_INCREMENT column you are supposed to use an IDENTITY strategy @Id @GeneratedValue strategy GenerationType.IDENTITY.. strategy @Id @GeneratedValue strategy GenerationType.IDENTITY private Long id Which is what you'd get when using AUTO with..
Correct use of flush() in JPA/Hibernate http://stackoverflow.com/questions/4275111/correct-use-of-flush-in-jpa-hibernate PK which is manually set and also has an auto generated IDENTITY field recordId . This recordId should be written to entity B.. calling em.persist on A . If I have an auto generated IDENTITY PK then the value is directly updated in the entity but that's..
How does an entity get an ID before a transaction is committed in JPA/Play? http://stackoverflow.com/questions/8169640/how-does-an-entity-get-an-id-before-a-transaction-is-committed-in-jpa-play the database to get the PK value as far as I remember the IDENTITY strategy works that way . As a contrary the TABLE or SEQUENCE..
http://stackoverflow.com/questions/2720738/java-short-and-casting question These are the relevant JLS sections JLS 5.1.1 Identity Conversion A conversion from a type to that same type is permitted.. Assignment contexts allow the use of one of the following Identity conversion ... In addition if the expression is a constant expression..
Bypass GeneratedValue in Hibernate (merge data not in db?) http://stackoverflow.com/questions/3194721/bypass-generatedvalue-in-hibernate-merge-data-not-in-db false private Integer id and import org.hibernate.id.IdentityGenerator ... public class UseIdOrGenerate extends IdentityGenerator.. ... public class UseIdOrGenerate extends IdentityGenerator private static final Logger log Logger.getLogger UseIdOrGenerate.class.getName.. you basically define your own ID generator based on the Identity strategy and if the ID is not set you delegate the generation..
How to map a composite key with Hibernate? http://stackoverflow.com/questions/3585034/how-to-map-a-composite-key-with-hibernate applies. So here they are 2.1.4 Primary Keys and Entity Identity ... A composite primary key must correspond to either a single.. 1.0 specification Section 2.1.4 Primary Keys and Entity Identity Section 9.1.14 EmbeddedId Annotation Section 9.1.14 IdClass..
http://stackoverflow.com/questions/9256114/ireport-external-font CDATA fonts arialbi.ttf boldItalic pdfEncoding CDATA Identity H pdfEncoding pdfEmbedded CDATA true pdfEmbedded locales locale.. CDATA fonts arialbi.ttf boldItalic pdfEncoding CDATA Identity H pdfEncoding pdfEmbedded CDATA false pdfEmbedded fontFamily..
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