Bug 183346 Datetime value with pattern from birt:paramDef page to report is wrong.
Description: Datetime value with pattern from birt:paramDef page to report is wrong. Build number:2.2.0.v20070420 Steps to reproduce: 1. New a report with a datetime type parameter, drag the parameter to layout. 2. New a birt jsp file. <birt:parameterPage id="0" name="customparameterpage" reportDesign="report/customJspTagParamDefPattern.rptdesign" isCustom="true"> <birt:paramDef id="5" name="p_dt" pattern="yyyy/MM/dd hh" value ="2006/09/23 10"/> <input type="submit" value="submit"/> </birt:parameterPage> 3. Preview the jsp file and click submit Expected result: Display datetime value correctly. Actual result: Display Apr 28, 0016 10:00 AM Error log:N/A
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/taglib/ParamDefTag.java
* @return
	 * @throws Exception
	 */
	protected boolean __validate( ) throws Exception
	{
		if ( !param.validate( ) )
			return false;
		
		Pattern p = Pattern.compile( "^\\w+$" ); 
		Matcher m = p.matcher( param.getId( ) );
		if ( !m.find( ) )
		{
			throw new JspTagException( BirtResources
					.getMessage( ResourceConstants.TAGLIB_INVALID_ATTR_ID ) );
		}
		
		if ( pageContext.findAttribute( param.getId( ) ) != null )
		{
			throw new JspTagException( BirtResources
					.getMessage( ResourceConstants.TAGLIB_ATTR_ID_DUPLICATE ) );
		}
		return true;
	}
	/**
	 * Handle event before doEndTag
	 */
	protected void __beforeEndTag( )
	{
		
		pageContext.setAttribute( param.getId( ), param.getName( ) );