[hibernate-issues] [Hibernate-JIRA] Created: (HBX-793) Inherited meta attributes are totally broken

[Rob Jellinghaus (JIRA)]

Inherited meta attributes are totally broken
--------------------------------------------

         Key: HBX-793
         URL: http://opensource.atlassian.com/projects/hibernate/browse/HBX-793
     Project: Hibernate Tools
        Type: Bug

  Components: hbm2java  
    Versions: 3.2beta8    
 Environment: Hibernate 3.2.0cr8, Hibernate Tools 3.2.0cr8
    Reporter: Rob Jellinghaus


Inherited / overridden meta attributes are totally broken.

By "totally broken" I mean that they are essentially concatenated in the output template, rather than being overridden properly.

There is already an existing bug http://opensource.atlassian.com/projects/hibernate/browse/HBX-621 that is one manifestation of this underlying problem for <meta attribute="scope-get"> and <meta attribute="scope-get">.  The exact same bug reappears for <meta attribute="generated-class">.

Here is an example that shows the bug appearing in both attributes.  The following mapping (simplified):

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping  PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN"  "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping default-lazy="false">
	<class name="com.nimblefish.core.domain.useraccesscontrol.Permission" table="permission">
        <meta attribute="generated-class">com.nimblefish.core.domain.generated.PermissionGen</meta>
        <id  column="id" name="id" type="long" unsaved-value="null">
            <meta attribute="use-in-tostring">true</meta>	
            <generator class="native"/>
        </id>
<!-- other properties deleted -->
        <joined-subclass name="com.nimblefish.core.domain.useraccesscontrol.Role"table="role">
           <meta attribute="generated-class">com.nimblefish.core.domain.generated.RoleGen</meta>
           <meta attribute="scope-set">protected</meta>
            <key column="id" foreign-key="fk_role_sub_permission"/>
           <set name="grantedPermissions" inverse="true" table="role_to_granted_permission">
                <meta attribute="scope-set">public</meta> 
               <key column="role_id" foreign-key="fk_granted_permission_role"/>
                <many-to-many class="com.nimblefish.core.domain.useraccesscontrol.Permission" column="permission_id" foreign-key="fk_role_granted_permission"/>
            </set>
<!-- other properties deleted -->
        </joined-subclass>
    </class>
</hibernate-mapping>

Produces the following class, in the directory <out-dir>/PermissionGencom/nimblefish/core/domain/generated/RoleGen.java (that is NOT a typo):

package com.nimblefish.core.domain.generated.PermissionGencom.nimblefish.core.domain.generated;
// Generated Oct 27, 2006 9:58:57 PM by Hibernate Tools 3.2.0.beta8
import com.nimblefish.core.domain.useraccesscontrol.TargetObjectContainer;
import java.util.HashSet;
import java.util.Set;
/**
 * RoleGen generated by hbm2java
 */
public class RoleGen extends com.nimblefish.core.domain.useraccesscontrol.Permission implements java.io.Serializable {
    // Fields    
// fields deleted
    protectedpublic void setGrantedPermissions(Set grantedPermissions) {
        this.grantedPermissions = grantedPermissions;
    }
}


You can see that:

1) The filename contains the CONCATENATION of the meta attributes and superclass name.
2) The package declaration contains the exact same conctatenation.
3) The scope of the setGrantedPermissions method contains the CONCATENATION of the scope-set values.

I strongly believe that the root bug is related to the following method in org.hibernate.tool.hbm2x.MetaAttributeHelper.java:

	public static String getMetaAsString(org.hibernate.mapping.MetaAttribute c) {		
		return c==null?"":getMetaAsString(c.getValues() );
	}

I don't know exactly what the collection of values of a MetaAttribute is, but I am fairly convinced that it is the sequence of values defined up the inheritance chain.  And I am *quite* sure that getMetaAsString(Collection meta, String separator) concatenates all the meta values together, which is exactly the behavior that is causing all these bugs.

Hibernate Tools can't go to 3.2.0GA until these issues are fixed.  I will be getting the code from Subversion and patching it myself (hackishly) on Sunday; I'll upload details of my fix then, along with a better test case in a properly runnable self-contained zip.


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