Hi Sebastian, Does your class have a public default constructor?
> -----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, 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