The exception shows that OJB is trying to assign an instance of the wrong object to User.logins.
The problem actually lies in your repository.xml. Look at the definition of the repository at http://db.apache.org/ojb/repository.html, and specifically at the collection-descriptor section. There is an optional attribute "collection-class" which defines the collection class that OJB will instantiate and assign. Note that I have never used this facility of OJB, so I'm afraid I can't be alot more help. Cheers, Charles. >-----Original Message----- >From: Goncalo Luiz [mailto:[EMAIL PROTECTED] >Sent: 01 July 2003 18:30 >To: ML - OJB Users List >Subject: Collections... > > >Hello > >I creatd a class XPTO that extends a Vector, and use XPTO as a >container. I used it as follows: > >class A >{ >XPTO bs; /**/ >} > > >I get the following error when I try to persist object A: >(what am I doing wrong?) > >[junit] [org.apache.ojb.broker.accesslayer.RsIterator] ERROR: >Error setting field:logins in object:domain.User >[junit] ------------- ---------------- --------------- >[junit] ------------- Standard Error ----------------- >[junit] java.lang.IllegalArgumentException >[junit] at >sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectField >AccessorImpl.java:63) >[junit] at java.lang.reflect.Field.set(Field.java:519) >[junit] at >org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDefau >ltImpl.set(Unknown Source) >[junit] at >org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollec >tion(Unknown Source) >[junit] at >org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollec >tions(Unknown Source) >[junit] at >org.apache.ojb.broker.accesslayer.RsIterator.getObjectFromResul >tSet(Unknown Source) >[junit] at >org.apache.ojb.broker.accesslayer.RsIterator.next(Unknown Source) >[junit] at persistence.ojb.UserOJB.readByUsername(Unknown Source) >[junit] at >persistence.ojb.UserOJBTest.testReadExistingUserByUsername(Unkn >own Source) >[junit] at >sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) >[junit] at >sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccesso >rImpl.java:39) >[junit] at >sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMetho >dAccessorImpl.java:25) >[junit] at java.lang.reflect.Method.invoke(Method.java:324) >[junit] at junit.framework.TestCase.runTest(TestCase.java:154) >[junit] at junit.framework.TestCase.runBare(TestCase.java:127) >[junit] at >junit.framework.TestResult$1.protect(TestResult.java:106) >[junit] at >junit.framework.TestResult.runProtected(TestResult.java:124) >[junit] at junit.framework.TestResult.run(TestResult.java:109) >[junit] at junit.framework.TestCase.run(TestCase.java:118) >[junit] at junit.framework.TestSuite.runTest(TestSuite.java:208) >[junit] at junit.framework.TestSuite.run(TestSuite.java:203) >[junit] at >org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.ru >n(JUnitTestRunner.java:325) >[junit] at >org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.ma >in(JUnitTestRunner.java:524) >[junit] rethrown as >org.apache.ojb.broker.metadata.MetadataException: Error >setting field:logins in object:domain.Us > >[junit] at >org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDefau >ltImpl.set(Unknown Source) >[junit] at >org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollec >tion(Unknown Source) >[junit] at >org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollec >tions(Unknown Source) >[junit] at >org.apache.ojb.broker.accesslayer.RsIterator.getObjectFromResul >tSet(Unknown Source) >[junit] at >org.apache.ojb.broker.accesslayer.RsIterator.next(Unknown Source) >[junit] at persistence.ojb.UserOJB.readByUsername(Unknown Source) >[junit] at >persistence.ojb.UserOJBTest.testReadExistingUserByUsername(Unkn >own Source) >[junit] at >sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) >[junit] at >sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccesso >rImpl.java:39) >[junit] at >sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMetho >dAccessorImpl.java:25) >[junit] at java.lang.reflect.Method.invoke(Method.java:324) >[junit] at junit.framework.TestCase.runTest(TestCase.java:154) >[junit] at junit.framework.TestCase.runBare(TestCase.java:127) >[junit] at >junit.framework.TestResult$1.protect(TestResult.java:106) >[junit] at >junit.framework.TestResult.runProtected(TestResult.java:124) >[junit] at junit.framework.TestResult.run(TestResult.java:109) >[junit] at junit.framework.TestCase.run(TestCase.java:118) >[junit] at junit.framework.TestSuite.runTest(TestSuite.java:208) >[junit] at junit.framework.TestSuite.run(TestSuite.java:203) >[junit] at >org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.ru >n(JUnitTestRunner.java:325) >[junit] at >org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.ma >in(JUnitTestRunner.java:524) >[junit] Caused by: java.lang.IllegalArgumentException >[junit] at >sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectField >AccessorImpl.java:63) >[junit] at java.lang.reflect.Field.set(Field.java:519) >[junit] ... 21 more >[junit] java.lang.IllegalArgumentException >[junit] at >sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectField >AccessorImpl.java:63) >[junit] at java.lang.reflect.Field.set(Field.java:519) >[junit] at >org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDefau >ltImpl.set(Unknown Source) >[junit] at >org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollec >tion(Unknown Source) >[junit] at >org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollec >tions(Unknown Source) >[junit] at >org.apache.ojb.broker.accesslayer.RsIterator.getObjectFromResul >tSet(Unknown Source) >[junit] at >org.apache.ojb.broker.accesslayer.RsIterator.next(Unknown Source) >[junit] at persistence.ojb.UserOJB.readByUsername(Unknown Source) >[junit] at >persistence.ojb.UserOJBTest.testReadExistingUserByUsername(Unkn >own Source) >[junit] at >sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) >[junit] at >sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccesso >rImpl.java:39) >[junit] at >sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMetho >dAccessorImpl.java:25) >[junit] at java.lang.reflect.Method.invoke(Method.java:324) >[junit] at junit.framework.TestCase.runTest(TestCase.java:154) >[junit] at junit.framework.TestCase.runBare(TestCase.java:127) >[junit] at >junit.framework.TestResult$1.protect(TestResult.java:106) >[junit] at >junit.framework.TestResult.runProtected(TestResult.java:124) >[junit] at junit.framework.TestResult.run(TestResult.java:109) >[junit] at junit.framework.TestCase.run(TestCase.java:118) >[junit] at junit.framework.TestSuite.runTest(TestSuite.java:208) >[junit] at junit.framework.TestSuite.run(TestSuite.java:203) >[junit] at >org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.ru >n(JUnitTestRunner.java:325) >[junit] at >org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.ma >in(JUnitTestRunner.java:524) >[junit] rethrown as >org.apache.ojb.broker.metadata.MetadataException: Error >setting field:logins in object:domain.Us > >[junit] at >org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDefau >ltImpl.set(Unknown Source) >[junit] at >org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollec >tion(Unknown Source) >[junit] at >org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollec >tions(Unknown Source) >[junit] at >org.apache.ojb.broker.accesslayer.RsIterator.getObjectFromResul >tSet(Unknown Source) >[junit] at >org.apache.ojb.broker.accesslayer.RsIterator.next(Unknown Source) >[junit] at persistence.ojb.UserOJB.readByUsername(Unknown Source) >[junit] at >persistence.ojb.UserOJBTest.testReadExistingUserByUsername(Unkn >own Source) >[junit] at >sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) >[junit] at >sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccesso >rImpl.java:39) >[junit] at >sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMetho >dAccessorImpl.java:25) >[junit] at java.lang.reflect.Method.invoke(Method.java:324) >[junit] at junit.framework.TestCase.runTest(TestCase.java:154) >[junit] at junit.framework.TestCase.runBare(TestCase.java:127) >[junit] at >junit.framework.TestResult$1.protect(TestResult.java:106) >[junit] at >junit.framework.TestResult.runProtected(TestResult.java:124) >[junit] at junit.framework.TestResult.run(TestResult.java:109) >[junit] at junit.framework.TestCase.run(TestCase.java:118) >[junit] at junit.framework.TestSuite.runTest(TestSuite.java:208) >[junit] at junit.framework.TestSuite.run(TestSuite.java:203) >[junit] at >org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.ru >n(JUnitTestRunner.java:325) >[junit] at >org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.ma >in(JUnitTestRunner.java:524) >[junit] Caused by: java.lang.IllegalArgumentException >[junit] at >sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectField >AccessorImpl.java:63) >[junit] at java.lang.reflect.Field.set(Field.java:519) >[junit] ... 21 more >[junit] 1/Jul/2003 18:24:41 >persistence.ojb.OJBPersistenceSupport beginTransaction >[junit] SEVERE: beginTransaction:There was another transaction already. >[junit] ------------- ---------------- --------------- > >[junit] Testcase: testReadExistingUserByUsername took 2,384 sec >[junit] FAILED >[junit] could not clean test data. >[junit] junit.framework.AssertionFailedError: could not clean >test data. >[junit] at >persistence.ojb.UserTestCaseOJB.cleanData(Unknown Source) >[junit] at persistence.ojb.UserTestCaseOJB.tearDown(Unknown Source) >[junit] at persistence.ojb.UserOJBTest.tearDown(Unknown Source) > >[junit] Testcase: testReadExistingUserByUsername >---- >Gon�alo Luiz - IST 4� Ano (PSI) >[EMAIL PROTECTED] > This email and any attachments are strictly confidential and are intended solely for the addressee. 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