I have a case where I have the following class structure:
CourseRole extends UserRole
Post contains a UserRole called 'creator'
I do:
Code:
p.setCreator(my new Course Role)
close hibernate
load p
system.out.println(p.getCReator())
cast p to CourseRole from UserRole.
get a class cast exception.
I know this isn't proper OO, and I won't be doing it outside of the test case, but I don't understand why it's happening and I'm afraid I have something wrong in my mappings.
The confusing thing, the System.out.println(p.getCreator()) shows CourseRole, the hibernate debug log shows it loaded a CourseRole, but it's showing the superclass's proxy class in the exception (even though the subclass has lazy=true which should specifiy it as the proxy class?) ie: UserRole$$EnhancerByCGLIB$
Can you not do straight casts when using proxied hibernate objects?
I've removed a bunch of extra properties from my mappings to try to keep things simple, so they look kinda bare compared to what's happening in the debug log.
Thoughts?
-mp
Hibernate version: 2.1.8
Mapping documents:Code:
<class name="edu.academyart.model.Post" dynamic-update="true" lazy="true" table="post">
<id name="id" type="long" column="id" >
<generator class="native"/>
</id>
<many-to-one name="creator" column="courseRoleId" class="edu.academyart.model.UserRole" cascade="none"/>
</class>
Code:
<class name="edu.academyart.model.UserRole" dynamic-update="true" lazy="true" table="userRole"
discriminator-value="userRole">
<id name="id" type="long" column="id">
<generator class="native"/>
</id>
<discriminator column="roleType" type="string"/>
</class>
Code:
<subclass name="edu.academyart.model.CourseRole" discriminator-value="courseRole"
lazy="true" extends="edu.academyart.model.UserRole">
</subclass>
Code between sessionFactory.openSession() and session.close():Code:
CourseRole role = TestCourseRole.createCourseRole(hibernate, c);
Post p = createPost(hibernate, t, role);
assertNotNull("creation of post with CourseRole", p);
hibernate.close();
hibernate = getHibernateSession();
p = (Post) hibernate.load(Post.class, p.getId());
assertNotNull("restoring p", p);
System.out.println(p.getCreator());
TestCourseRole.deleteCourseRole(hibernate, (CourseRole) p.getCreator());
Full stack trace of any exception that occurs:Code:
java.lang.ClassCastException: edu.academyart.model.UserRole$$EnhancerByCGLIB$$700f1695
at edu.academyart.model.graduate.TestPost.testPostWithCourseRole(TestPost.java:59)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at com.intellij.rt.execution.junit2.JUnitStarter.main(JUnitStarter.java:31)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:78)
Name and version of the database you are using:
sqlserver :P
Debug level Hibernate log excerpt:
13 Apr 2005 09:47:36 DEBUG SessionImpl:2216 - resolving associations for [edu.academyart.model.Post#10572]
13 Apr 2005 09:47:36 DEBUG SessionImpl:1996 - loading [edu.academyart.model.UserRole#15164]
13 Apr 2005 09:47:36 DEBUG SessionImpl:3994 - creating collection wrapper:[edu.academyart.model.Post.attachments#10572]
13 Apr 2005 09:47:36 DEBUG SessionImpl:3994 - creating collection wrapper:[edu.academyart.model.Post.courseRolesWhoHaveViewed#10572]
13 Apr 2005 09:47:36 DEBUG SessionImpl:1996 - loading [edu.academyart.model.Topic#5074]
13 Apr 2005 09:47:36 DEBUG SessionImpl:2247 - done materializing entity [edu.academyart.model.Post#10572]
13 Apr 2005 09:47:36 DEBUG SessionImpl:3161 - initializing non-lazy collections
13 Apr 2005 09:47:36 DEBUG SessionImpl:2094 - attempting to resolve [edu.academyart.model.UserRole#15164]
13 Apr 2005 09:47:36 DEBUG SessionImpl:2130 - object not resolved in any cache [edu.academyart.model.UserRole#15164]
13 Apr 2005 09:47:36 DEBUG EntityPersister:410 - Materializing entity: [edu.academyart.model.UserRole#15164]
13 Apr 2005 09:47:36 DEBUG BatcherImpl:204 - about to open: 0 open PreparedStatements, 0 open ResultSets
13 Apr 2005 09:47:36 DEBUG SQL:230 - select userrole0_.id as id1_, userrole0_.roleType as roleType1_, userrole0_.userId as userId1_, userrole0_.roledObjectType as roledObj4_1_, userrole0_.roledObjectId as roledObj5_1_, userrole0_.fromTopclass as fromTopc6_1_, userrole0_.accessPrincipalId as accessPr7_1_, userrole0_.student as student1_, userrole0_.teacher as teacher1_, userrole0_.admin as admin1_, userrole0_.canPost as canPost1_, userrole0_.canView as canView1_, userrole0_.enrolled as enrolled1_, accessprin1_.id as id0_, accessprin1_.name as name0_ from userRole userrole0_ left outer join accessPrincipal accessprin1_ on userrole0_.accessPrincipalId=accessprin1_.id where userrole0_.id=?
13 Apr 2005 09:47:36 DEBUG BatcherImpl:253 - preparing statement
13 Apr 2005 09:47:36 DEBUG Loader:281 - processing result set
13 Apr 2005 09:47:36 DEBUG Loader:484 - result row: 3, 15164
13 Apr 2005 09:47:36 DEBUG Loader:615 - Initializing object from ResultSet: 3
13 Apr 2005 09:47:36 DEBUG Loader:684 - Hydrating entity: edu.academyart.model.AccessPrincipal#3
13 Apr 2005 09:47:36 DEBUG Loader:615 - Initializing object from ResultSet: 15164
13 Apr 2005 09:47:36 DEBUG Loader:684 - Hydrating entity: edu.academyart.model.CourseRole#15164
13 Apr 2005 09:47:36 DEBUG Loader:298 - done processing result set (1 rows)
13 Apr 2005 09:47:36 DEBUG BatcherImpl:211 - done closing: 0 open PreparedStatements, 0 open ResultSets
13 Apr 2005 09:47:36 DEBUG BatcherImpl:275 - closing statement
13 Apr 2005 09:47:36 DEBUG Loader:318 - total objects hydrated: 2
13 Apr 2005 09:47:36 DEBUG SessionImpl:2216 - resolving associations for [edu.academyart.model.AccessPrincipal#3]
13 Apr 2005 09:47:36 DEBUG SessionImpl:2247 - done materializing entity [edu.academyart.model.AccessPrincipal#3]
13 Apr 2005 09:47:36 DEBUG SessionImpl:2216 - resolving associations for [edu.academyart.model.CourseRole#15164]
13 Apr 2005 09:47:36 DEBUG SessionImpl:3994 - creating collection wrapper:[edu.academyart.model.CourseRole.announcementsViewed#15164]
13 Apr 2005 09:47:36 DEBUG SessionImpl:3994 - creating collection wrapper:[edu.academyart.model.CourseRole.examEnrollments#15164]
13 Apr 2005 09:47:36 DEBUG SessionImpl:1996 - loading [edu.academyart.model.User#1]
13 Apr 2005 09:47:36 DEBUG SessionImpl:1996 - loading [edu.academyart.model.Course#2207]
13 Apr 2005 09:47:36 DEBUG SessionImpl:3994 - creating collection wrapper:[edu.academyart.model.UserRole.postsViewed#15164]
13 Apr 2005 09:47:36 DEBUG SessionImpl:1996 - loading [edu.academyart.model.AccessPrincipal#3]
13 Apr 2005 09:47:36 DEBUG SessionImpl:2094 - attempting to resolve [edu.academyart.model.AccessPrincipal#3]
13 Apr 2005 09:47:36 DEBUG SessionImpl:2110 - resolved object in session cache [edu.academyart.model.AccessPrincipal#3]
13 Apr 2005 09:47:36 DEBUG SessionImpl:2247 - done materializing entity [edu.academyart.model.CourseRole#15164]
13 Apr 2005 09:47:36 DEBUG SessionImpl:3161 - initializing non-lazy collections
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