Bug 200755 [smoke]Fail to preview Crosstab after deploy BIRT in application servers.[0601][1102]
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/expression/AbstractExpressionCompiler.java
*/
	private void compile( IScriptExpression baseExpr, Context context ) throws DataException
	{
		if ( baseExpr == null )
			return;
		CompiledExpression handle = this.compileExpression( baseExpr, context );
		baseExpr.setHandle( handle );
	}
	
	/**
	 * compile the scriptExpresion to generate a subclass of compiledExpression.
	 * 
	 * @param exp
	 * @param context
	 * @return
	 */
	protected CompiledExpression compileExpression( IScriptExpression baseExpr, Context context )
			throws DataException
	{
		String exp = "";
		try
		{
			this.scriptExpr = baseExpr;
			exp = baseExpr.getText( );
			if ( exp == null )
				return null;
			ScriptOrFnNode tree = parse( exp, context );
			return processScriptTree( exp, tree, context );
		}
		catch ( Exception e )