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Re: [eclipselink-users] Optimistic Lock Exception expected 
Hi,
Enclosed, you'll find the source code of the entity/main class and log output: 


@Entity
public class SimpleEntity implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    private String value;

    @Version
    private Long version;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        if (!(object instanceof SimpleEntity)) {
            return false;
        }
        SimpleEntity other = (SimpleEntity) object;
if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) { 
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "eclipselinktest.SimpleEnity[id=" + id + "]";
    }




public class Main {

    private static EntityManagerFactory emf;

    public static void main(String[] args) {

JpaHelper.getServerSession(getEntityManagerFactory()).getProject().assumeExistenceForDoesExist();

        SimpleEntity entity = new SimpleEntity();
        entity.setValue("entity");

        //persist "entity" and create clone "entityCopy"
EntityManager em1 = getEntityManagerFactory().createEntityManager(); 
        em1.getTransaction().begin();
        em1.persist(entity);
        em1.getTransaction().commit();
SimpleEntity entityCopy = em1.find(SimpleEntity.class, entity.getId()); 
        em1.close();

        //delete "entity" from database
EntityManager em2 = getEntityManagerFactory().createEntityManager(); 
        em2.getTransaction().begin();
        entity = em2.merge(entity);
        em2.remove(entity);
        em2.getTransaction().commit();
        em2.close();

        //merge clone "entityCopy" and commit
EntityManager em3 = getEntityManagerFactory().createEntityManager(); 
        em3.getTransaction().begin();
        entityCopy = em3.merge(entityCopy);
        em3.lock(entityCopy, LockModeType.WRITE);
        em3.getTransaction().commit();
        em3.close();
    }

    private static EntityManagerFactory getEntityManagerFactory() {
        if (emf == null) {
emf = Persistence.createEntityManagerFactory("EclipseLinkTestPU"); 
        }
        return emf;
    }




LOG OUTPUT:
===========
[EL Finest]: 2009-04-16 10:57:45.749--ServerSession(20248218)--Thread(Thread[main,5,main])--Begin predeploying Persistence Unit EclipseLinkTestPU; state Initial; factoryCount 0 [EL Finest]: 2009-04-16 10:57:45.776--ServerSession(20248218)--Thread(Thread[main,5,main])--property=eclipselink.weaving; value=false [EL Finest]: 2009-04-16 10:57:45.776--ServerSession(20248218)--Thread(Thread[main,5,main])--property=eclipselink.orm.throw.exceptions; default value=true [EL Finer]: 2009-04-16 10:57:45.776--ServerSession(20248218)--Thread(Thread[main,5,main])--Searching for default mapping file in file:/root/workspace/EclipseLinkTest/src/ [EL Finer]: 2009-04-16 10:57:45.779--ServerSession(20248218)--Thread(Thread[main,5,main])--Searching for default mapping file in file:/root/workspace/EclipseLinkTest/src/ [EL Config]: 2009-04-16 10:57:45.904--ServerSession(20248218)--Thread(Thread[main,5,main])--The access type for the persistent class [class eclipselinktest.SimpleEntity] is set to [FIELD]. [EL Config]: 2009-04-16 10:57:45.904--ServerSession(20248218)--Thread(Thread[main,5,main])--The alias name for the entity class [class eclipselinktest.SimpleEntity] is being defaulted to: SimpleEntity. [EL Config]: 2009-04-16 10:57:45.907--ServerSession(20248218)--Thread(Thread[main,5,main])--The table name for entity [class eclipselinktest.SimpleEntity] is being defaulted to: SIMPLEENTITY. [EL Config]: 2009-04-16 10:57:45.944--ServerSession(20248218)--Thread(Thread[main,5,main])--The column name for element [private java.lang.Long eclipselinktest.SimpleEntity.id] is being defaulted to: ID. [EL Config]: 2009-04-16 10:57:45.945--ServerSession(20248218)--Thread(Thread[main,5,main])--The column name for element [private java.lang.String eclipselinktest.SimpleEntity.value] is being defaulted to: VALUE. [EL Config]: 2009-04-16 10:57:45.945--ServerSession(20248218)--Thread(Thread[main,5,main])--The column name for element [private java.lang.Long eclipselinktest.SimpleEntity.version] is being defaulted to: VERSION. [EL Finest]: 2009-04-16 10:57:45.951--ServerSession(20248218)--Thread(Thread[main,5,main])--End predeploying Persistence Unit EclipseLinkTestPU; state Predeployed; factoryCount 0 [EL Finer]: 2009-04-16 10:57:45.952--Thread(Thread[main,5,main])--JavaSECMPInitializer - transformer is null. [EL Finest]: 2009-04-16 10:57:45.952--ServerSession(20248218)--Thread(Thread[main,5,main])--Begin predeploying Persistence Unit EclipseLinkTestPU; state Predeployed; factoryCount 0 [EL Finest]: 2009-04-16 10:57:45.952--ServerSession(20248218)--Thread(Thread[main,5,main])--End predeploying Persistence Unit EclipseLinkTestPU; state Predeployed; factoryCount 1 [EL Finest]: 2009-04-16 10:57:45.955--ServerSession(20248218)--Thread(Thread[main,5,main])--Begin deploying Persistence Unit EclipseLinkTestPU; state Predeployed; factoryCount 1 [EL Finest]: 2009-04-16 10:57:45.97--ServerSession(20248218)--Thread(Thread[main,5,main])--property=eclipselink.logging.level; value=FINEST; translated value=FINEST [EL Finest]: 2009-04-16 10:57:45.971--ServerSession(20248218)--Thread(Thread[main,5,main])--property=eclipselink.logging.level; value=FINEST; translated value=FINEST [EL Finest]: 2009-04-16 10:57:45.971--ServerSession(20248218)--Thread(Thread[main,5,main])--property=eclipselink.jdbc.user; value=root [EL Finest]: 2009-04-16 10:57:45.971--ServerSession(20248218)--Thread(Thread[main,5,main])--property=eclipselink.jdbc.password; value=xxxxxx [EL Finest]: 2009-04-16 10:57:46.844--ServerSession(20248218)--Thread(Thread[main,5,main])--property=eclipselink.jdbc.driver; value=com.mysql.jdbc.Driver [EL Finest]: 2009-04-16 10:57:46.844--ServerSession(20248218)--Thread(Thread[main,5,main])--property=eclipselink.jdbc.url; value=jdbc:mysql://10.16.46.243:3307/jpatest [EL Info]: 2009-04-16 10:57:46.847--ServerSession(20248218)--Thread(Thread[main,5,main])--EclipseLink, version: Eclipse Persistence Services - 1.1.0.r3634 [EL Finest]: 2009-04-16 10:57:47.168--Thread(Thread[main,5,main])--DBPlatform: org.eclipse.persistence.platform.database.InformixPlatform, RegularExpression: (?i)informix.*. [EL Finest]: 2009-04-16 10:57:47.169--Thread(Thread[main,5,main])--DBPlatform: org.eclipse.persistence.platform.database.PointBasePlatform, RegularExpression: (?i)pointbase.*. [EL Finest]: 2009-04-16 10:57:47.169--Thread(Thread[main,5,main])--DBPlatform: org.eclipse.persistence.platform.database.DB2Platform, RegularExpression: (?i).*db2.*. [EL Finest]: 2009-04-16 10:57:47.169--Thread(Thread[main,5,main])--DBPlatform: org.eclipse.persistence.platform.database.SQLServerPlatform, RegularExpression: (?i)microsoft.*. [EL Finest]: 2009-04-16 10:57:47.169--Thread(Thread[main,5,main])--DBPlatform: org.eclipse.persistence.platform.database.PostgreSQLPlatform, RegularExpression: (?i)postgresql.*. [EL Finest]: 2009-04-16 10:57:47.169--Thread(Thread[main,5,main])--DBPlatform: org.eclipse.persistence.platform.database.SybasePlatform, RegularExpression: (?i)(sybase.*)|(adaptive server enterprise.*)|(SQL Server). [EL Finest]: 2009-04-16 10:57:47.17--Thread(Thread[main,5,main])--DBPlatform: org.eclipse.persistence.platform.database.JavaDBPlatform, RegularExpression: (?i).*derby. [EL Finest]: 2009-04-16 10:57:47.17--Thread(Thread[main,5,main])--DBPlatform: org.eclipse.persistence.platform.database.oracle.Oracle10Platform, RegularExpression: (?i)oracle.*. [EL Finest]: 2009-04-16 10:57:47.17--Thread(Thread[main,5,main])--DBPlatform: org.eclipse.persistence.platform.database.MySQLPlatform, RegularExpression: (?i)mysql.*. [EL Fine]: 2009-04-16 10:57:47.171--Thread(Thread[main,5,main])--Detected Vendor platform: org.eclipse.persistence.platform.database.MySQLPlatform [EL Config]: 2009-04-16 10:57:47.195--ServerSession(20248218)--Connection(15734641)--Thread(Thread[main,5,main])--connecting(DatabaseLogin( 
        platform=>MySQLPlatform
        user name=> "root"
        datasource URL=> "jdbc:mysql://10.16.46.243:3307/jpatest"
))
[EL Config]: 2009-04-16 10:57:47.227--ServerSession(20248218)--Connection(11511434)--Thread(Thread[main,5,main])--Connected: jdbc:mysql://10.16.46.243:3307/jpatest 
        User: root@cerebrum
        Database: MySQL  Version: 5.1.23-ndb-6.2.15a-cluster-com
Driver: MySQL-AB JDBC Driver Version: mysql-connector-java-5.1.6 ( Revision: ${svn.Revision} ) [EL Config]: 2009-04-16 10:57:47.228--ServerSession(20248218)--Connection(31375837)--Thread(Thread[main,5,main])--connecting(DatabaseLogin( 
        platform=>MySQLPlatform
        user name=> "root"
        datasource URL=> "jdbc:mysql://10.16.46.243:3307/jpatest"
))
[EL Config]: 2009-04-16 10:57:47.26--ServerSession(20248218)--Connection(12590745)--Thread(Thread[main,5,main])--Connected: jdbc:mysql://10.16.46.243:3307/jpatest 
        User: root@cerebrum
        Database: MySQL  Version: 5.1.23-ndb-6.2.15a-cluster-com
Driver: MySQL-AB JDBC Driver Version: mysql-connector-java-5.1.6 ( Revision: ${svn.Revision} ) [EL Config]: 2009-04-16 10:57:47.26--ServerSession(20248218)--Connection(18414151)--Thread(Thread[main,5,main])--connecting(DatabaseLogin( 
        platform=>MySQLPlatform
        user name=> "root"
        datasource URL=> "jdbc:mysql://10.16.46.243:3307/jpatest"
))
[EL Config]: 2009-04-16 10:57:47.295--ServerSession(20248218)--Connection(810652)--Thread(Thread[main,5,main])--Connected: jdbc:mysql://10.16.46.243:3307/jpatest 
        User: root@cerebrum
        Database: MySQL  Version: 5.1.23-ndb-6.2.15a-cluster-com
Driver: MySQL-AB JDBC Driver Version: mysql-connector-java-5.1.6 ( Revision: ${svn.Revision} ) [EL Config]: 2009-04-16 10:57:47.295--ServerSession(20248218)--Connection(1537969)--Thread(Thread[main,5,main])--connecting(DatabaseLogin( 
        platform=>MySQLPlatform
        user name=> "root"
        datasource URL=> "jdbc:mysql://10.16.46.243:3307/jpatest"
))
[EL Config]: 2009-04-16 10:57:47.327--ServerSession(20248218)--Connection(18306724)--Thread(Thread[main,5,main])--Connected: jdbc:mysql://10.16.46.243:3307/jpatest 
        User: root@cerebrum
        Database: MySQL  Version: 5.1.23-ndb-6.2.15a-cluster-com
Driver: MySQL-AB JDBC Driver Version: mysql-connector-java-5.1.6 ( Revision: ${svn.Revision} ) [EL Config]: 2009-04-16 10:57:47.327--ServerSession(20248218)--Connection(20526817)--Thread(Thread[main,5,main])--connecting(DatabaseLogin( 
        platform=>MySQLPlatform
        user name=> "root"
        datasource URL=> "jdbc:mysql://10.16.46.243:3307/jpatest"
))
[EL Config]: 2009-04-16 10:57:47.363--ServerSession(20248218)--Connection(4973260)--Thread(Thread[main,5,main])--Connected: jdbc:mysql://10.16.46.243:3307/jpatest 
        User: root@cerebrum
        Database: MySQL  Version: 5.1.23-ndb-6.2.15a-cluster-com
Driver: MySQL-AB JDBC Driver Version: mysql-connector-java-5.1.6 ( Revision: ${svn.Revision} ) [EL Config]: 2009-04-16 10:57:47.363--ServerSession(20248218)--Connection(1503089)--Thread(Thread[main,5,main])--connecting(DatabaseLogin( 
        platform=>MySQLPlatform
        user name=> "root"
        datasource URL=> "jdbc:mysql://10.16.46.243:3307/jpatest"
))
[EL Config]: 2009-04-16 10:57:47.394--ServerSession(20248218)--Connection(15855697)--Thread(Thread[main,5,main])--Connected: jdbc:mysql://10.16.46.243:3307/jpatest 
        User: root@cerebrum
        Database: MySQL  Version: 5.1.23-ndb-6.2.15a-cluster-com
Driver: MySQL-AB JDBC Driver Version: mysql-connector-java-5.1.6 ( Revision: ${svn.Revision} ) [EL Config]: 2009-04-16 10:57:47.395--ServerSession(20248218)--Connection(30969271)--Thread(Thread[main,5,main])--connecting(DatabaseLogin( 
        platform=>MySQLPlatform
        user name=> "root"
        datasource URL=> "jdbc:mysql://10.16.46.243:3307/jpatest"
))
[EL Config]: 2009-04-16 10:57:47.428--ServerSession(20248218)--Connection(1352077)--Thread(Thread[main,5,main])--Connected: jdbc:mysql://10.16.46.243:3307/jpatest 
        User: root@cerebrum
        Database: MySQL  Version: 5.1.23-ndb-6.2.15a-cluster-com
Driver: MySQL-AB JDBC Driver Version: mysql-connector-java-5.1.6 ( Revision: ${svn.Revision} ) [EL Finest]: 2009-04-16 10:57:47.459--ServerSession(20248218)--Thread(Thread[main,5,main])--sequencing connected, state is Preallocation_Transaction_NoAccessor_State [EL Finest]: 2009-04-16 10:57:47.459--ServerSession(20248218)--Thread(Thread[main,5,main])--sequence : preallocation size 50 [EL Finest]: 2009-04-16 10:57:47.459--ServerSession(20248218)--Thread(Thread[main,5,main])--sequence SEQ_GEN: preallocation size 50 [EL Info]: 2009-04-16 10:57:47.516--ServerSession(20248218)--Thread(Thread[main,5,main])--file:/root/workspace/EclipseLinkTest/src/-EclipseLinkTestPU login successful [EL Finest]: 2009-04-16 10:57:47.537--ServerSession(20248218)--Thread(Thread[main,5,main])--Execute query DataModifyQuery(sql="CREATE TABLE SIMPLEENTITY (ID BIGINT NOT NULL, VALUE VARCHAR(255), VERSION BIGINT, PRIMARY KEY (ID))") [EL Fine]: 2009-04-16 10:57:47.538--ServerSession(20248218)--Connection(12590745)--Thread(Thread[main,5,main])--CREATE TABLE SIMPLEENTITY (ID BIGINT NOT NULL, VALUE VARCHAR(255), VERSION BIGINT, PRIMARY KEY (ID)) [EL Finest]: 2009-04-16 10:57:47.567--Thread(Thread[main,5,main])--The table (SIMPLEENTITY) is created. [EL Finest]: 2009-04-16 10:57:47.568--ServerSession(20248218)--Thread(Thread[main,5,main])--Execute query DataModifyQuery(sql="CREATE TABLE SEQUENCE (SEQ_NAME VARCHAR(50) NOT NULL, SEQ_COUNT DECIMAL(38), PRIMARY KEY (SEQ_NAME))") [EL Fine]: 2009-04-16 10:57:47.568--ServerSession(20248218)--Connection(11511434)--Thread(Thread[main,5,main])--CREATE TABLE SEQUENCE (SEQ_NAME VARCHAR(50) NOT NULL, SEQ_COUNT DECIMAL(38), PRIMARY KEY (SEQ_NAME)) [EL Finest]: 2009-04-16 10:57:47.571--ServerSession(20248218)--Thread(Thread[main,5,main])--Execute query DataReadQuery(sql="SELECT * FROM SEQUENCE WHERE SEQ_NAME = 'SEQ_GEN'") [EL Fine]: 2009-04-16 10:57:47.571--ServerSession(20248218)--Connection(12590745)--Thread(Thread[main,5,main])--SELECT * FROM SEQUENCE WHERE SEQ_NAME = SEQ_GEN [EL Finest]: 2009-04-16 10:57:47.575--ServerSession(20248218)--Thread(Thread[main,5,main])--Execute query DataModifyQuery(sql="INSERT INTO SEQUENCE(SEQ_NAME, SEQ_COUNT) values ('SEQ_GEN', 0)") [EL Fine]: 2009-04-16 10:57:47.575--ServerSession(20248218)--Connection(11511434)--Thread(Thread[main,5,main])--INSERT INTO SEQUENCE(SEQ_NAME, SEQ_COUNT) values (SEQ_GEN, 0) [EL Finest]: 2009-04-16 10:57:47.576--ServerSession(20248218)--Thread(Thread[main,5,main])--End deploying Persistence Unit EclipseLinkTestPU; state Deployed; factoryCount 1 [EL Finer]: 2009-04-16 10:57:47.602--ServerSession(20248218)--Thread(Thread[main,5,main])--client acquired [EL Finest]: 2009-04-16 10:57:47.605--UnitOfWork(18135083)--Thread(Thread[main,5,main])--PERSIST operation called on: eclipselinktest.SimpleEnity[id=null]. [EL Finer]: 2009-04-16 10:57:47.606--ClientSession(21443983)--Connection(810652)--Thread(Thread[main,5,main])--begin transaction [EL Finest]: 2009-04-16 10:57:47.606--ClientSession(21443983)--Thread(Thread[main,5,main])--Execute query DataModifyQuery(sql="UPDATE SEQUENCE SET SEQ_COUNT = SEQ_COUNT + #PREALLOC_SIZE WHERE SEQ_NAME = #SEQ_NAME") [EL Fine]: 2009-04-16 10:57:47.608--ClientSession(21443983)--Connection(810652)--Thread(Thread[main,5,main])--UPDATE SEQUENCE SET SEQ_COUNT = SEQ_COUNT + ? WHERE SEQ_NAME = ? 
        bind => [50, SEQ_GEN]
[EL Finest]: 2009-04-16 10:57:47.611--ClientSession(21443983)--Thread(Thread[main,5,main])--Execute query ValueReadQuery(sql="SELECT SEQ_COUNT FROM SEQUENCE WHERE SEQ_NAME = #SEQ_NAME") [EL Fine]: 2009-04-16 10:57:47.611--ClientSession(21443983)--Connection(810652)--Thread(Thread[main,5,main])--SELECT SEQ_COUNT FROM SEQUENCE WHERE SEQ_NAME = ? 
        bind => [SEQ_GEN]
[EL Finest]: 2009-04-16 10:57:47.613--ClientSession(21443983)--Connection(810652)--Thread(Thread[main,5,main])--local sequencing preallocation for SEQ_GEN: objects: 50 , first: 1, last: 50 [EL Finer]: 2009-04-16 10:57:47.613--ClientSession(21443983)--Connection(810652)--Thread(Thread[main,5,main])--commit transaction [EL Finest]: 2009-04-16 10:57:47.614--ServerSession(20248218)--Connection(810652)--Thread(Thread[main,5,main])--local sequencing preallocation is copied to preallocation after transaction commit [EL Finest]: 2009-04-16 10:57:47.614--UnitOfWork(18135083)--Thread(Thread[main,5,main])--assign sequence to the object (1 -> eclipselinktest.SimpleEnity[id=null]) [EL Finer]: 2009-04-16 10:57:47.618--UnitOfWork(18135083)--Thread(Thread[main,5,main])--begin unit of work commit [EL Finer]: 2009-04-16 10:57:47.623--ClientSession(21443983)--Connection(18306724)--Thread(Thread[main,5,main])--begin transaction [EL Finest]: 2009-04-16 10:57:47.625--UnitOfWork(18135083)--Thread(Thread[main,5,main])--Execute query InsertObjectQuery(eclipselinktest.SimpleEnity[id=1]) [EL Fine]: 2009-04-16 10:57:47.627--ClientSession(21443983)--Connection(18306724)--Thread(Thread[main,5,main])--INSERT INTO SIMPLEENTITY (ID, VALUE, VERSION) VALUES (?, ?, ?) 
        bind => [1, entity, 1]
[EL Finer]: 2009-04-16 10:57:47.638--ClientSession(21443983)--Connection(18306724)--Thread(Thread[main,5,main])--commit transaction [EL Finer]: 2009-04-16 10:57:47.64--UnitOfWork(18135083)--Thread(Thread[main,5,main])--end unit of work commit [EL Finer]: 2009-04-16 10:57:47.64--UnitOfWork(18135083)--Thread(Thread[main,5,main])--resume unit of work [EL Finest]: 2009-04-16 10:57:47.66--UnitOfWork(18135083)--Thread(Thread[main,5,main])--Execute query ReadObjectQuery(referenceClass=SimpleEntity sql="SELECT ID, VALUE, VERSION FROM SIMPLEENTITY WHERE (ID = ?)") [EL Finer]: 2009-04-16 10:57:47.661--UnitOfWork(18135083)--Thread(Thread[main,5,main])--release unit of work [EL Finer]: 2009-04-16 10:57:47.661--ClientSession(21443983)--Thread(Thread[main,5,main])--client released [EL Finer]: 2009-04-16 10:57:47.661--ServerSession(20248218)--Thread(Thread[main,5,main])--client acquired [EL Finest]: 2009-04-16 10:57:47.661--UnitOfWork(2799187)--Thread(Thread[main,5,main])--Merge clone with references eclipselinktest.SimpleEnity[id=1] [EL Finest]: 2009-04-16 10:57:47.662--UnitOfWork(2799187)--Thread(Thread[main,5,main])--The remove operation has been performed on: eclipselinktest.SimpleEnity[id=1] [EL Finer]: 2009-04-16 10:57:47.662--UnitOfWork(2799187)--Thread(Thread[main,5,main])--begin unit of work commit [EL Finer]: 2009-04-16 10:57:47.662--ClientSession(11001145)--Connection(4973260)--Thread(Thread[main,5,main])--begin transaction [EL Finest]: 2009-04-16 10:57:47.664--UnitOfWork(2799187)--Thread(Thread[main,5,main])--Execute query DeleteObjectQuery(eclipselinktest.SimpleEnity[id=1]) [EL Fine]: 2009-04-16 10:57:47.664--ClientSession(11001145)--Connection(4973260)--Thread(Thread[main,5,main])--DELETE FROM SIMPLEENTITY WHERE ((ID = ?) AND (VERSION = ?)) 
        bind => [1, 1]
[EL Finer]: 2009-04-16 10:57:47.668--ClientSession(11001145)--Connection(4973260)--Thread(Thread[main,5,main])--commit transaction [EL Finer]: 2009-04-16 10:57:47.669--UnitOfWork(2799187)--Thread(Thread[main,5,main])--end unit of work commit [EL Finer]: 2009-04-16 10:57:47.669--UnitOfWork(2799187)--Thread(Thread[main,5,main])--resume unit of work [EL Finer]: 2009-04-16 10:57:47.669--UnitOfWork(2799187)--Thread(Thread[main,5,main])--release unit of work [EL Finer]: 2009-04-16 10:57:47.669--ClientSession(11001145)--Thread(Thread[main,5,main])--client released [EL Finer]: 2009-04-16 10:57:47.669--ServerSession(20248218)--Thread(Thread[main,5,main])--client acquired [EL Finest]: 2009-04-16 10:57:47.669--UnitOfWork(4641320)--Thread(Thread[main,5,main])--Merge clone with references eclipselinktest.SimpleEnity[id=1] [EL Finest]: 2009-04-16 10:57:47.67--UnitOfWork(4641320)--Thread(Thread[main,5,main])--Execute query ReadObjectQuery(referenceClass=SimpleEntity ) [EL Fine]: 2009-04-16 10:57:47.671--ServerSession(20248218)--Connection(12590745)--Thread(Thread[main,5,main])--SELECT ID, VALUE, VERSION FROM SIMPLEENTITY WHERE (ID = ?) 
        bind => [1]
[EL Finer]: 2009-04-16 10:57:47.673--UnitOfWork(4641320)--Thread(Thread[main,5,main])--begin unit of work commit [EL Finer]: 2009-04-16 10:57:47.674--ClientSession(25358187)--Connection(15855697)--Thread(Thread[main,5,main])--begin transaction [EL Finest]: 2009-04-16 10:57:47.674--UnitOfWork(4641320)--Thread(Thread[main,5,main])--Execute query InsertObjectQuery(eclipselinktest.SimpleEnity[id=1]) [EL Fine]: 2009-04-16 10:57:47.675--ClientSession(25358187)--Connection(15855697)--Thread(Thread[main,5,main])--INSERT INTO SIMPLEENTITY (ID, VALUE, VERSION) VALUES (?, ?, ?) 
        bind => [1, entity, 1]
[EL Finer]: 2009-04-16 10:57:47.676--ClientSession(25358187)--Connection(15855697)--Thread(Thread[main,5,main])--commit transaction [EL Finer]: 2009-04-16 10:57:47.677--UnitOfWork(4641320)--Thread(Thread[main,5,main])--end unit of work commit [EL Finer]: 2009-04-16 10:57:47.677--UnitOfWork(4641320)--Thread(Thread[main,5,main])--resume unit of work [EL Finer]: 2009-04-16 10:57:47.677--UnitOfWork(4641320)--Thread(Thread[main,5,main])--release unit of work [EL Finer]: 2009-04-16 10:57:47.677--ClientSession(25358187)--Thread(Thread[main,5,main])--client released 
BUILD SUCCESSFUL (total time: 2 seconds)


James Sutherland schrieb:

A lock error should occur on your merge() call, it is unexpected if it does
not.

Ensure that you have an @Version in your object.  If still not getting the
error please include the code for your class and the log on finest of your
test.



Mathias Koehnke - Sun Microsystems wrote:

Hi,
while replacing Toplink Essentials (2.0.1-b04-fcs (04/11/2008)) by EclipseLink 1.1 for a Java SE project, I came across a problem that prevents me from switching: I would expect getting an Optimistic Lock exception in case an entity gets removed from the database (by another thread or whatever) and one tries to commit on a still-existing runtime object of that entity. That was my expectation and it worked with Toplink Essentials so far. Using EclipseLink it doesn't throw an OL exception, instead the entity gets re-inserted in the database.
Am I using JPA/EclipseLink the wrong way or do I miss something? From my understanding the following example should throw an OL exception when committing the last transaction: 

Entity entity = new Entity();
entity.setValue("entity");

//persist "entity" and create clone "entityCopy"
EntityManager em1 = getEntityManagerFactory().createEntityManager();
em1.getTransaction().begin();
em1.persist(entity);
em1.getTransaction().commit();
Entity entityCopy = em1.find(Entity.class, entity.getId());
em1.close();

//delete "entity" from database
EntityManager em2 = getEntityManagerFactory().createEntityManager();
em2.getTransaction().begin();
entity = em2.merge(entity);
em2.remove(entity);
em2.getTransaction().commit();
em2.close();

//merge clone "entityCopy" and commit
EntityManager em3 = getEntityManagerFactory().createEntityManager();
em3.getTransaction().begin();
entityCopy = em3.merge(entityCopy);
em3.lock(entityCopy, LockModeType.WRITE);
em3.getTransaction().commit();
em3.close();
Note: I already added a SessionCustomizer modifying the session the following way: 

session.getProject().assumeExistenceForDoesExist();
So, EclipseLink shouldn't check the database for the existence of the entity at all. Instead it should assume that the entity exists and simply execute an "UPDATE ..." sql statement. 


Thanks for your help in advance.

Best regards,
Mathias Koehnke





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http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland http://www.eclipse.org/eclipselink/ 
 EclipseLink ,  http://www.oracle.com/technology/products/ias/toplink/
TopLink Wiki: http://wiki.eclipse.org/EclipseLink EclipseLink , http://wiki.oracle.com/page/TopLink TopLink Forums: http://forums.oracle.com/forums/forum.jspa?forumID=48 TopLink , http://www.nabble.com/EclipseLink-f26430.html EclipseLink Book: http://en.wikibooks.org/wiki/Java_Persistence Java Persistence

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