6 Replies Latest reply on Feb 5, 2008 8:49 AM by Alexander Tsirel

    Problem with simple example of @ManyToMany

    Alexander Tsirel Newbie

      I have two entities Course and Student (example from book Mastering EJB3) related as bidirectional many to many. Application fails during deployment.

      Environment:
      -----------------------
      JBoss Bootstrap Environment

      JBOSS_HOME: C:\jboss-4.2.1.GA

      JAVA: C:\Program Files\Java\jdk1.5.0_09\bin\java

      JAVA_OPTS: -Dprogram.name=run.bat -server -Xms128m -Xmx512m -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000

      CLASSPATH: C:\Program Files\Java\jdk1.5.0_09\lib\tools.jar;C:\jboss-4.2.1.GA\bin\run.jar
      --------------------------------

      Here is the log:
      16:05:01,600 WARN [ServiceController] Problem starting service persistence.units:ear=javaEEApplication.ear,jar=EJB.jar,unitName=first
      javax.persistence.PersistenceException: org.hibernate.MappingException: Could not determine type for: java.util.Collection, for columns: [org.hibernate.mapping.Column(students)]
      at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:720)
      at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:127)
      at org.jboss.ejb3.entity.PersistenceUnitDeployment.start(PersistenceUnitDeployment.java:246)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:585)
      at org.jboss.ejb3.ServiceDelegateWrapper.startService(ServiceDelegateWrapper.java:103)
      at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:289)
      at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:245)
      at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:585)
      at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
      at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
      at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
      at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
      at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
      at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:978)
      at $Proxy0.start(Unknown Source)

      Here is the debug log:
      2008-01-25 16:05:01,069 INFO [org.hibernate.cfg.AnnotationBinder] Binding entity from annotated class: com.gemini.test.ejb.entity.relationship.Course
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.Ejb3Column] Binding column DTYPE unique false
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.annotations.EntityBinder] Import with entity name=CourseUni
      2008-01-25 16:05:01,069 INFO [org.hibernate.cfg.annotations.EntityBinder] Bind entity com.gemini.test.ejb.entity.relationship.Course on table CourseUni
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.AnnotationBinder] Processing com.gemini.test.ejb.entity.relationship.Course property annotation
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.AnnotationBinder] Processing annotations of com.gemini.test.ejb.entity.relationship.Course.id
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.Ejb3Column] Binding column id unique false
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.AnnotationBinder] id is an id
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.annotations.SimpleValueBinder] building SimpleValue for id
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.annotations.PropertyBinder] Building property id
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.AnnotationBinder] Bind @Id on id
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.AnnotationBinder] Processing annotations of com.gemini.test.ejb.entity.relationship.Course.students
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.Ejb3Column] Binding column students unique false
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.annotations.PropertyBinder] binding property students with lazy=false
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.annotations.SimpleValueBinder] building SimpleValue for students
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.annotations.PropertyBinder] Building property students
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.AnnotationBinder] Processing annotations of com.gemini.test.ejb.entity.relationship.Course.courseName
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.Ejb3Column] Binding column courseName unique false
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.annotations.PropertyBinder] binding property courseName with lazy=false
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.annotations.SimpleValueBinder] building SimpleValue for courseName
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.annotations.PropertyBinder] Building property courseName
      2008-01-25 16:05:01,069 INFO [org.hibernate.cfg.AnnotationBinder] Binding entity from annotated class: com.gemini.test.ejb.entity.relationship.Student
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.Ejb3Column] Binding column DTYPE unique false
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.annotations.EntityBinder] Import with entity name=StudentUni
      2008-01-25 16:05:01,069 INFO [org.hibernate.cfg.annotations.EntityBinder] Bind entity com.gemini.test.ejb.entity.relationship.Student on table StudentUni
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.AnnotationBinder] Processing com.gemini.test.ejb.entity.relationship.Student property annotation
      2008-01-25 16:05:01,069 DEBUG [org.jboss.mx.loading.RepositoryClassLoader] setRepository, repository=org.jboss.mx.loading.HeirarchicalLoaderRepository3@11775bc, cl=org.jboss.mx.loading.HeirarchicalLoaderRepository3$CacheClassLoader@14de7ea{ url=null ,addedOrder=0}
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.AnnotationBinder] Processing annotations of com.gemini.test.ejb.entity.relationship.Student.id
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.Ejb3Column] Binding column id unique false
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.AnnotationBinder] id is an id
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.annotations.SimpleValueBinder] building SimpleValue for id
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.annotations.PropertyBinder] Building property id
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.AnnotationBinder] Bind @Id on id
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.AnnotationBinder] Processing annotations of com.gemini.test.ejb.entity.relationship.Student.name
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.Ejb3Column] Binding column name unique false
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.annotations.PropertyBinder] binding property name with lazy=false
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.annotations.SimpleValueBinder] building SimpleValue for name
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.annotations.PropertyBinder] Building property name
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.AnnotationBinder] Processing annotations of com.gemini.test.ejb.entity.relationship.Student.courses
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.Ejb3Column] Binding column null unique false
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.Ejb3Column] Binding column element unique false
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.Ejb3Column] Binding column mapkey unique false
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.Ejb3Column] Binding column null unique false
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.Ejb3Column] Binding column null unique false
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.Ejb3Column] Binding column null unique false
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.annotations.CollectionBinder] Collection role: com.gemini.test.ejb.entity.relationship.Student.courses
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.annotations.PropertyBinder] Building property courses
      2008-01-25 16:05:01,069 DEBUG [org.hibernate.cfg.AnnotationConfiguration] processing manytoone fk mappings
      2008-01-25 16:05:01,225 DEBUG [org.hibernate.cfg.Configuration] processing extends queue
      2008-01-25 16:05:01,225 DEBUG [org.hibernate.cfg.Configuration] processing collection mappings
      2008-01-25 16:05:01,225 DEBUG [org.hibernate.cfg.CollectionSecondPass] Second pass for collection: com.gemini.test.ejb.entity.relationship.Student.courses
      2008-01-25 16:05:01,225 DEBUG [org.hibernate.cfg.annotations.CollectionBinder] Binding as ManyToMany: com.gemini.test.ejb.entity.relationship.Student.courses
      2008-01-25 16:05:01,240 DEBUG [org.hibernate.cfg.CollectionSecondPass] Mapped collection key: StudentUni_id, element: courses_id
      2008-01-25 16:05:01,240 DEBUG [org.hibernate.cfg.CollectionSecondPass] Second pass for collection: com.gemini.test.ejb.entity.relationship.Company.employees
      2008-01-25 16:05:01,240 DEBUG [org.hibernate.cfg.annotations.CollectionBinder] Binding a OneToMany: com.gemini.test.ejb.entity.relationship.Company.employees through a foreign key
      2008-01-25 16:05:01,240 INFO [org.hibernate.cfg.annotations.CollectionBinder] Mapping collection: com.gemini.test.ejb.entity.relationship.Company.employees -> EmployeeOMUni
      2008-01-25 16:05:01,240 DEBUG [org.hibernate.cfg.annotations.TableBinder] Retrieving property com.gemini.test.ejb.entity.relationship.Employee.company
      2008-01-25 16:05:01,240 DEBUG [org.hibernate.cfg.CollectionSecondPass] Mapped collection key: company_id, one-to-many: com.gemini.test.ejb.entity.relationship.Employee
      2008-01-25 16:05:01,240 DEBUG [org.hibernate.cfg.Configuration] processing native query and ResultSetMapping mappings
      2008-01-25 16:05:01,240 DEBUG [org.hibernate.cfg.Configuration] processing association property references
      2008-01-25 16:05:01,240 DEBUG [org.hibernate.cfg.Configuration] processing foreign key constraints
      2008-01-25 16:05:01,240 DEBUG [org.hibernate.cfg.Configuration] resolving reference to class: com.gemini.test.ejb.entity.separate.RoadVehicle
      2008-01-25 16:05:01,240 DEBUG [org.hibernate.cfg.Configuration] resolving reference to class: com.gemini.test.ejb.entity.separate.Car
      2008-01-25 16:05:01,240 DEBUG [org.hibernate.cfg.Configuration] resolving reference to class: com.gemini.test.ejb.entity.relationship.Company
      2008-01-25 16:05:01,240 DEBUG [org.hibernate.cfg.Configuration] resolving reference to class: com.gemini.test.ejb.entity.separate.RoadVehicle
      2008-01-25 16:05:01,240 DEBUG [org.hibernate.cfg.Configuration] resolving reference to class: com.gemini.test.ejb.entity.relationship.Shipment
      2008-01-25 16:05:01,240 DEBUG [org.hibernate.cfg.Configuration] resolving reference to class: com.gemini.test.ejb.entity.separate.Car
      2008-01-25 16:05:01,240 DEBUG [org.hibernate.cfg.Configuration] resolving reference to class: com.gemini.test.ejb.entity.relationship.Course
      2008-01-25 16:05:01,240 DEBUG [org.hibernate.cfg.Configuration] resolving reference to class: com.gemini.test.ejb.entity.relationship.Student
      2008-01-25 16:05:01,303 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,334 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,334 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,350 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,350 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,365 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,365 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,381 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,381 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,381 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,381 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,381 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,397 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,397 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,397 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,397 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,397 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,397 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,397 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,490 DEBUG [org.hibernate.ejb.util.NamingHelper] Not Ejb3Configuration to JNDI, no JNDI name configured
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.cfg.Configuration] Preparing to build session factory with filters : {}
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.cfg.AnnotationConfiguration] Execute first pass mapping processing
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.cfg.AnnotationConfiguration] Process hbm files
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.cfg.AnnotationConfiguration] Process annotated classes
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.cfg.AnnotationConfiguration] processing manytoone fk mappings
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.cfg.Configuration] processing extends queue
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.cfg.Configuration] processing collection mappings
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.cfg.Configuration] processing native query and ResultSetMapping mappings
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.cfg.Configuration] processing association property references
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.cfg.Configuration] processing foreign key constraints
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.cfg.Configuration] resolving reference to class: com.gemini.test.ejb.entity.separate.RoadVehicle
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.cfg.Configuration] resolving reference to class: com.gemini.test.ejb.entity.separate.Car
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.cfg.Configuration] resolving reference to class: com.gemini.test.ejb.entity.relationship.Company
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.cfg.Configuration] resolving reference to class: com.gemini.test.ejb.entity.separate.RoadVehicle
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.cfg.Configuration] resolving reference to class: com.gemini.test.ejb.entity.relationship.Shipment
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.cfg.Configuration] resolving reference to class: com.gemini.test.ejb.entity.separate.Car
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.cfg.Configuration] resolving reference to class: com.gemini.test.ejb.entity.relationship.Course
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.cfg.Configuration] resolving reference to class: com.gemini.test.ejb.entity.relationship.Student
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,506 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,522 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,522 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,522 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,522 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,522 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,522 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,537 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,537 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,537 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,537 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,537 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,553 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,553 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,553 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,553 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,553 DEBUG [org.hibernate.validator.ClassValidator] ResourceBundle ValidatorMessages not found in Validator classloader. Delegate to org.hibernate.validator.resources.DefaultValidatorMessages
      2008-01-25 16:05:01,553 DEBUG [org.jboss.mx.loading.RepositoryClassLoader] setRepository, repository=org.jboss.mx.loading.HeirarchicalLoaderRepository3@11775bc, cl=org.jboss.mx.loading.HeirarchicalLoaderRepository3$CacheClassLoader@f2e328{ url=null ,addedOrder=0}
      2008-01-25 16:05:01,600 DEBUG [org.jboss.ejb3.ServiceDelegateWrapper] Starting failed persistence.units:ear=javaEEApplication.ear,jar=EJB.jar,unitName=first
      javax.persistence.PersistenceException: org.hibernate.MappingException: Could not determine type for: java.util.Collection, for columns: [org.hibernate.mapping.Column(students)]
      at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:720)
      at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:127)
      at org.jboss.ejb3.entity.PersistenceUnitDeployment.start(PersistenceUnitDeployment.java:246)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:585)
      at org.jboss.ejb3.ServiceDelegateWrapper.startService(ServiceDelegateWrapper.java:103)
      at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:289)
      at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:245)
      at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:585)
      at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
      at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
      at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
      at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
      at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
      at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:978)
      at $Proxy0.start(Unknown Source)

      Here is my code for both entities:
      @Entity(name = "StudentUni")
      public class Student implements Serializable {
      private int id;
      private String name;
      private Collection courses = new ArrayList();

      public Student(){
      id = (int) System.nanoTime();
      }

      @Id
      public int getId() {
      return id;
      }

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

      public String getName() {
      return name;
      }

      public void setName(String name) {
      this.name = name;
      }

      @ManyToMany
      public Collection getCourses() {
      return courses;
      }

      public void setCourses(Collection courses) {
      this.courses = courses;
      }
      }

      @Entity(name = "CourseUni")
      public class Course implements Serializable {
      private int id;
      private String courseName;
      private Collection students = new ArrayList();

      public Course(){
      id = (int) System.nanoTime();
      }

      @Id
      public int getId() {
      return id;
      }

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

      public String getCourseName() {
      return courseName;
      }

      public void setCourseName(String courseName) {
      this.courseName = courseName;
      }


      @ManyToMany(mappedBy = "courses")
      public Collection getStudents() {
      return students;
      }


      public void setStudents(Collection students) {
      this.students = students;
      }
      }


      Please help!!

      Waiting for your thoughts in the forum or
      at alexander dot tsirel at gmail dot com

      Alexander