Hibernate - Programmatic configuration

Question

I'm trying to configure Hibernate classes not through XML/Annotation, but using their programmatic API:

Mappings mappings = configuration.createMappings();
    mappings.addClass(...);

An example of column addition:

public void addColumn(String colName, String accessorName, NullableType type)
      {
        if(this._table == null)
          {
            return;
          }

        Column column = new Column(colName);
//        this._table.addColumn(column);

        Property prop = new Property();
        prop.setName(accessorName);

        SimpleValue simpleValue = new SimpleValue();
        simpleValue.setTypeName(type.getName());
        simpleValue.addColumn(column);
        simpleValue.setTable(_table);
        prop.setValue(simpleValue);

        this._rootClass.addProperty(prop);
      }

This works, till the first time I need to add a column with a name that already exists. Its not that I add the same column to the same table, these are two different tables, but nevertheless, I receive

 ERROR:  java.lang.NullPointerException
    at
 org.hibernate.mapping.PersistentClass.checkColumnDuplication(PersistentClass.java:711)

I checked against the source code (I'm using Hibernate 3.3.1 GA) and there is a line in PersistentClass, line 711:

protected void checkColumnDuplication() {
    HashSet cols = new HashSet(); <=========After this line 'cols' already contain data!
    if (getIdentifierMapper() == null ) {
        //an identifier mapper => getKey will be included in the getNonDuplicatedPropertyIterator()
        //and checked later, so it needs to be excluded
        checkColumnDuplication( cols, getKey().getColumnIterator() );
    }
    checkColumnDuplication( cols, getDiscriminatorColumnIterator() );
    checkPropertyColumnDuplication( cols, getNonDuplicatedPropertyIterator() );
    Iterator iter = getJoinIterator();
    while ( iter.hasNext() ) {
        cols.clear();
        Join join = (Join) iter.next();
        checkColumnDuplication( cols, join.getKey().getColumnIterator() );
        checkPropertyColumnDuplication( cols, join.getPropertyIterator() );
    }
}

Did anybody try to configure it like that, had the same issue?...

Thanks in advance

Rachel Cullen · Accepted Answer · 2009-12-09 11:00:50Z

1

Your null pointer is because you haven't given your RootClass object an Entity name - you just need to call setEntityName on the root class and you will get past the initial exception.

You also need to define an identifier value on the root class - just call setIdentifier using the value that you want to make your identifier. (Don't also call addProperty with this or it will complain of column duplication).

answered Dec 9, 2009 at 11:00

Rachel Cullen

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