Bug 123035 Serialize primitive types, hashmaps and other Java classes not using Java serialization method
If you take a look at the serialized engine output, we frequently see java classes appearing. I see String class; I see PageHint class; I see Hashmap classes. All of these should be gone so that BIRT document is independent of any Java-based class serialization. DtE team will move primitive type serialization to BIRT.CORE, see 123034. Engine can use that.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/AbstractDataEngine.java
abstract protected IResultSet doExecute( IBaseQueryDefinition query );
	protected IResultSet getParentResultSet( )
	{
		for ( int i = queryResultStack.size( ) - 1; i >= 0; i-- )
		{
			DteResultSet rs = ( DteResultSet ) queryResultStack.get( i );
			if ( rs.getQueryResults( ) != null )
				return rs;
		}
		return null;
	}
	protected boolean validateQueryResult( IQueryResults queryResults )
			throws BirtException
	{
		IResultIterator riter = queryResults.getResultIterator( );
		assert riter != null;
		return riter != null;
	}
	protected IResultSet getSubqueryResult( IBaseQueryDefinition query )
	{
		
		
		assert query instanceof ISubqueryDefinition;
		if ( queryResultStack.isEmpty( ) )
			return null;
		assert ( queryResultStack.getLast( ) instanceof DteResultSet );
		DteResultSet resultSet;
		try
		{
			DteResultSet parent = ( DteResultSet ) queryResultStack.getLast( );