I changed that, but still no result. :-/ It reports "can't access class member with modifiers 'public'" and still the "can't intanciate class, may be no constructor is available".
I really don't know what to do anymore. -----Ursprüngliche Nachricht----- Von: Gus Heck [mailto:[EMAIL PROTECTED] Gesendet: Donnerstag, 18. Dezember 2003 21:20 An: OJB Users List Betreff: Re: AW: JDO - Unable to build object instance It might be because you havn't followed the javabean get/set pattern... you wrote: public String GetName() { public void SetName(String name) { but the standard pattern is public String getName() { public void setName(String name) { This probably causes the enhancer to not recognize your object as having any properties to enhance or some such. - Gus Sebastian Muench wrote: >Hi all, > >yes, I have the default public constructor. >May it be, I missed some settings? >I did: >- the mapping in the Person.jdo (copied to target/classes/JDOTest/) >- the mapping in the repository_jdo.xml (in target/test/ojb/) >- the schema - creation in the hsqldb > >The build and enhance of the class is successful. >See more complete source code below. > >Thanks for help, >Sebastian > > > >>>>>>>>>>>>>>>>>>>>>>>>>>>>Person.class <<<<<<<<<<<<<<<<<<<<<<< >>>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>>>>>>>> >package JDOTest; > >import java.io.Serializable; > >public class Person implements Serializable { > > private int id; > protected String name; > > public Person() { > > } > > public Person(int id, String name) { > this.id = id; > this.name = name; > } > > public int GetId() { > return this.id; > } > > public String GetName() { > return this.name; > } > > public void SetId(int id) { > this.id = id; > } > > public void SetName(String name) { > this.name = name; > } > >} > > > >>>>>>>>>>>>>>>>>>>>>>>>>>>>TestJdo.class <<<<<<<<<<<<<<<<<<<<<<< >>>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>>>>>>>> > >... > >public class TestJdo { > > private PersistenceManagerFactory factory; > private PersistenceManager manager; > > public TestJdo() { > > factory = null; > manager = null; > > try { > factory = new OjbStorePMF(); > manager = factory.getPersistenceManager(); > } catch(Throwable t) { > System.out.println(t.getMessage()); > t.printStackTrace(); > } > > } > > ... > > private void run() { > > Person p = new Person(); > > try { > > PersistenceBrokerFactory.defaultPersistenceBroker().clearCache(); > this.manager.currentTransaction().begin(); > Query query = this.manager.newQuery(Person.class); > > Collection allPerson = (Collection)query.execute(); > > Iterator iter = allPerson.iterator(); > if(!iter.hasNext()) { > System.out.println("No entries found"); > } > > while(iter.hasNext()) { > System.out.println(iter.next()); > } > > manager.currentTransaction().commit(); > } catch(Throwable t) { > t.printStackTrace(); > } > > finally { > manager.close(); > } > > } > >} > > >-----Ursprüngliche Nachricht----- >Von: Brian McCallister [mailto:[EMAIL PROTECTED] >Gesendet: Mittwoch, 17. Dezember 2003 18:34 >An: OJB Users List >Betreff: Re: JDO - Unable to build object instance > > >It doesn't outside of JDO at least, I use private no-arg constructors >with OJB all the time. > >-Brian > > >On Wed, 2003-12-17 at 12:18, Gus Heck wrote: > > >>Mahler Thomas wrote: >> >> >> >>>Hi Sebastian, >>> >>>Does your class have a public default constructor? >>> >>> >>> >>> >>> >>> >> From _Core Java Data Objects_ page 51: >> >>"There is one requirement, however; JDO requires that a >>persistence-capable class have a no-arguments constructor. This >>constructor does not need to be declared public it just needs to be >>accessible to the class itself and to any potential subclasses. If thee >>are no sublcasses it can be declared as private." >> >>Does OJB place a further restriction that it must be public? >> >>-Gus >> >> >> >>> >>> >>>>-----Original Message----- >>>>From: Sebastian Muench [mailto:[EMAIL PROTECTED] >>>>Sent: Wednesday, December 17, 2003 1:42 AM >>>>To: OJB Users List; [EMAIL PROTECTED] >>>>Subject: R: JDO - Unable to build object instance >>>> >>>> >>>>Oh, the file I mentioned in my last mail hasn't been attached. >>>>Here is the screenshot: >>>> >>>>[JDO] DEBUG: OjbStoreConnector.begin: connectionReadyForRelease=false >>>>[org.apache.ojb.broker.accesslayer.RsIterator] ERROR: Error >>>>while iterate >>>>ResultSet for query >>>>org.apache.ojb.broker.accesslayer.RsQueryObject[query: >>>>Query from class JDOTest.Person where null, class descriptor: >>>>JDOTest.Person] >>>>Unable to build object instance (MAYBE you don't have a constructor >>>>available):class JDOTest.Person >>>>org.apache.ojb.broker.PersistenceBrokerException: Unable to >>>>build object >>>>instance (MAYBE you don't have a constructor available):class >>>>JDOTest.Person >>>> at >>>>org.apache.ojb.broker.accesslayer.RowReaderDefaultImpl.buildWi >>>>thReflection(R >>>>owReaderDefaultImpl.java:239) >>>> at >>>>org.apache.ojb.broker.accesslayer.RowReaderDefaultImpl.readObj >>>>ectFrom(RowRea >>>>derDefaultImpl.java:115) >>>> at >>>>org.apache.ojb.broker.accesslayer.RsIterator.getObjectFromResu >>>>ltSet(RsIterat >>>>or.java:463) >>>> at >>>>org.apache.ojb.broker.accesslayer.RsIterator.next(RsIterator.java:284) >>>> at >>>>org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionB >>>>yQuery(QueryRe >>>>ferenceBroker.java:147) >>>> at >>>>org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionB >>>>yQuery(QueryRe >>>>ferenceBroker.java:244) >>>> at >>>>org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionB >>>>yQuery(QueryRe >>>>ferenceBroker.java:263) >>>> at >>>>org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollection >>>>ByQuery(Persis >>>>tenceBrokerImpl.java:997) >>>> at >>>>org.apache.ojb.broker.core.DelegatingPersistenceBroker.getColl >>>>ectionByQuery( >>>>DelegatingPersistenceBroker.java:322) >>>> at >>>>org.apache.ojb.broker.core.DelegatingPersistenceBroker.getColl >>>>ectionByQuery( >>>>DelegatingPersistenceBroker.java:322) >>>> at >>>>org.apache.ojb.jdori.sql.OjbExtent.<init>(OjbExtent.java:98) >>>> at >>>>org.apache.ojb.jdori.sql.OjbStoreManager.getExtent(OjbStoreMan >>>>ager.java:251) >>>> at >>>>com.sun.jdori.common.PersistenceManagerImpl.getExtent(Unknown >>>>Source) >>>> at >>>>com.sun.jdori.common.query.QueryImpl.checkCandidates(Unknown >>>>Source) >>>> at >>>>com.sun.jdori.common.query.QueryImpl.execute(Unknown Source) >>>> at JDOTest.TestJdo.run(TestJdo.java:52) >>>> at JDOTest.TestJdo.main(TestJdo.java:39) >>>>Caused by: >>>>org.apache.ojb.broker.metadata.ClassNotPersistenceCapableExcep >>>>tion: (Could >>>>not instantiate JDOTest.Person: Class >>>>org.apache.ojb.broker.util.ConstructorHelper can not access a >>>>member of >>>>class JDOTest.Person with modifiers "public") >>>> at >>>>org.apache.ojb.broker.util.ConstructorHelper.instantiate(Const >>>>ructorHelper.j >>>>ava:162) >>>> at >>>>org.apache.ojb.broker.accesslayer.RowReaderDefaultImpl.buildWi >>>>thReflection(R >>>>owReaderDefaultImpl.java:235) >>>> ... 16 more >>>>Caused by: java.lang.IllegalAccessException: Class >>>>org.apache.ojb.broker.util.ConstructorHelper can not access a >>>>member of >>>>class JDOTest.Person with modifiers "public" >>>> at >>>>sun.reflect.Reflection.ensureMemberAccess(Reflection.java:57) >>>> at >>>>java.lang.reflect.Constructor.newInstance(Constructor.java:268) >>>> at >>>>org.apache.ojb.broker.util.ConstructorHelper.instantiate(Const >>>>ructorHelper.j >>>>ava:158) >>>> ... 17 more >>>>org.apache.ojb.broker.PersistenceBrokerException: >>>>java.util.NoSuchElementException: Could not obtain next >>>>object: Unable to >>>>build object instance (MAYBE you >>>>don't have a constructor available):class JDOTest.Person >>>> at >>>>org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionB >>>>yQuery(QueryRe >>>>ferenceBroker.java:251) >>>> at >>>>org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionB >>>>yQuery(QueryRe >>>>ferenceBroker.java:263) >>>> at >>>>org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollection >>>>ByQuery(Persis >>>>tenceBrokerImpl.java:997) >>>> at >>>>org.apache.ojb.broker.core.DelegatingPersistenceBroker.getColl >>>>ectionByQuery( >>>>DelegatingPersistenceBroker.java:322) >>>> at >>>>org.apache.ojb.broker.core.DelegatingPersistenceBroker.getColl >>>>ectionByQuery( >>>>DelegatingPersistenceBroker.java:322) >>>> at >>>>org.apache.ojb.jdori.sql.OjbExtent.<init>(OjbExtent.java:98) >>>> at >>>>org.apache.ojb.jdori.sql.OjbStoreManager.getExtent(OjbStoreMan >>>>ager.java:251) >>>> at >>>>com.sun.jdori.common.PersistenceManagerImpl.getExtent(Unknown >>>>Source) >>>> at >>>>com.sun.jdori.common.query.QueryImpl.checkCandidates(Unknown >>>>Source) >>>> at >>>>com.sun.jdori.common.query.QueryImpl.execute(Unknown Source) >>>> at JDOTest.TestJdo.run(TestJdo.java:52) >>>> at JDOTest.TestJdo.main(TestJdo.java:39) >>>>Caused by: java.util.NoSuchElementException: Could not obtain >>>>next object: >>>>Unable to build object instance (MAYBE you don't have a constructor >>>>available):class JDOTest.Person >>>> at >>>>org.apache.ojb.broker.accesslayer.RsIterator.next(RsIterator.java:310) >>>> at >>>>org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionB >>>>yQuery(QueryRe >>>>ferenceBroker.java:147) >>>> at >>>>org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionB >>>>yQuery(QueryRe >>>>ferenceBroker.java:244) >>>> ... 11 more >>>>Exception in thread "main" javax.jdo.JDOUserException: Cannot close >>>>PersistenceManager while transaction is still active. >>>> at >>>>com.sun.jdori.common.PersistenceManagerImpl.close(Unknown Source) >>>> at >>>>com.sun.jdori.common.PersistenceManagerImpl.popCurrentWrapper(Unknown >>>>Source) >>>> at >>>>com.sun.jdori.common.PersistenceManagerWrapper.close(Unknown >>>>Source) >>>> at JDOTest.TestJdo.run(TestJdo.java:69) >>>> at JDOTest.TestJdo.main(TestJdo.java:39) >>>> >>>> >>>> >>>>--------------------------------------------------------------------- >>>>To unsubscribe, e-mail: [EMAIL PROTECTED] >>>>For additional commands, e-mail: [EMAIL PROTECTED] >>>> >>>> >>>> >>>> >>>> >>>> >>>--------------------------------------------------------------------- >>>To unsubscribe, e-mail: [EMAIL PROTECTED] >>>For additional commands, e-mail: [EMAIL PROTECTED] >>> >>> >>> >>> >>> >> >>--------------------------------------------------------------------- >>To unsubscribe, e-mail: [EMAIL PROTECTED] >>For additional commands, e-mail: [EMAIL PROTECTED] >> >> >> >> > > > >--------------------------------------------------------------------- >To unsubscribe, e-mail: [EMAIL PROTECTED] >For additional commands, e-mail: [EMAIL PROTECTED] > > 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