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Hibernate version:
3.0.x
Name and version of the database you are using: MySQL 5.x with InnoDB
Hi, I am all day looking for a way to map a generic class, like this
Code:
public class Version<T> {
protected Version() {}
public Version( T data) {this.data = data;}
void setData(T data) {
this.data = data;
}
public T getData() {
return data;
}
}
Now I want to map this in a hbm-file, I cannot get it right.
The hbm-file looks like this:
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE hibernate-mapping
PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="org.openehr.rm.common.changecontrol.Version"
table="version">
<id type="long" column="_id" name="_id">
<generator class="identity"/>
</id>
<discriminator/>
<any name="data" meta-type="class" id-type="long" cascade="all">
<column name="data_class"/>
<column name="data_id"/>
</any>
</class>
</hibernate-mapping>I tried several things.
I must say, maybe this helps. T can stand for a class known in this context (mapped in another hbm-file)
I also tried to use the class with string.
Like this
Code:
Version<String> v = new Version<String>("test");
I get this exception:
org.hibernate.MappingException: Unknown entity: java.lang.String
In this case it stops just before building the SQL-statement
DEBUG [main] (Cascades.java:836) - processing cascade ACTION_SAVE_UPDATE for: org.openehr.rm.support.identification.LocatableReference
DEBUG [main] (Cascades.java:861) - done processing cascade ACTION_SAVE_UPDATE for: org.openehr.rm.support.identification.LocatableReference
DEBUG [main] (Cascades.java:153) - cascading to saveOrUpdate: null
If I try it with a known class in this hibernate context (mapped in the same set of hbm-files. ) I get another error:
java.lang.ClassCastException: java.lang.String
In this case, it seems to stop inside the building of the SQL-statement.
(please not I show a simplified version of the problem, else it willb e too confusing, and I want you to save work
DEBUG [main] (Cascades.java:836) - processing cascade ACTION_SAVE_UPDATE for: org.openehr.rm.support.identification.LocatableReference
DEBUG [main] (Cascades.java:861) - done processing cascade ACTION_SAVE_UPDATE for: org.openehr.rm.support.identification.LocatableReference
DEBUG [main] (Cascades.java:153) - cascading to saveOrUpdate: null
DEBUG [main] (AbstractSaveEventListener.java:394) - persistent instance of: org.openehr.rm.support.identification.LocatableReference
DEBUG [main] (DefaultSaveOrUpdateEventListener.java:103) - ignoring persistent instance
DEBUG [main] (DefaultSaveOrUpdateEventListener.java:140) - object already associated with session: [org.openehr.rm.support.identification.LocatableReference#13]
DEBUG [main] (Cascades.java:861) - done processing cascade ACTION_SAVE_UPDATE for: org.openehr.rm.common.changecontrol.OriginalVersion
DEBUG [main] (BasicEntityPersister.java:1732) - Inserting entity: org.openehr.rm.common.changecontrol.OriginalVersion (native id)
DEBUG [main] (AbstractBatcher.java:290) - about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
DEBUG [main] (AbstractBatcher.java:324) - insert into version (signature, lifecycle_state_id, commit_audit_id, uid_id, preceding_version_id, contribution_id, data_class, data_id, is_merged_id, class) values (?, ?, ?, ?, ?, ?, ?, ?, ?, 'OriginalVersion')
Hibernate: insert into version (signature, lifecycle_state_id, commit_audit_id, uid_id, preceding_version_id, contribution_id, data_class, data_id, is_merged_id, class) values (?, ?, ?, ?, ?, ?, ?, ?, ?, 'OriginalVersion')
DEBUG [main] (AbstractBatcher.java:378) - preparing statement
DEBUG [main] (BasicEntityPersister.java:1612) - Dehydrating entity: [org.openehr.rm.common.changecontrol.OriginalVersion#<null>]
DEBUG [main] (NullableType.java:52) - binding null to parameter: 1
DEBUG [main] (NullableType.java:59) - binding '24' to parameter: 2
DEBUG [main] (NullableType.java:59) - binding '6' to parameter: 3
DEBUG [main] (NullableType.java:59) - binding '23' to parameter: 4
DEBUG [main] (NullableType.java:52) - binding null to parameter: 5
DEBUG [main] (NullableType.java:59) - binding '15' to parameter: 6
DEBUG [main] (AbstractBatcher.java:298) - about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
DEBUG [main] (AbstractBatcher.java:416) - closing statement
As you may have guessed, the problem occured in OriginalVersion which is a child of (abstract) Version. But I don't believe that that is the problem.
You see that it does no try to bind paramters 7, 8, etc.
I think the problem is in the hbm file, (wehere else can it be?)
thanks for any help
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