Bug 148761 Unable to copy a report item from template to report
Steps: 1. Create a template, add a Text item "t1" or others 2. Create template item using "t1" 3. Double click the template item and we get a report item again. 4. We copy the item, paste to another report file. Expected: the text item can be copied. Actual result: Nothing happened, not copied and no error msg.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/metadata/ElementDefn.java
{
		if ( StringUtil.isBlank( javaClass ) )
		{
			throw new MetaDataException( new String[]{name},
					MetaDataException.DESIGN_EXCEPTION_MISSING_JAVA_CLASS );
		}
		try
		{
			Class c = Class.forName( javaClass );
			Class clazz = c;
			while ( clazz.getSuperclass( ) != null )
			{
				if ( clazz == DesignElement.class )
					break;
				clazz = clazz.getSuperclass( );
			}
			if ( clazz != DesignElement.class )
				
				throw new MetaDataException(
						new String[]{javaClass},
						MetaDataException.DESIGN_EXCEPTION_INVALID_ELEMENT_JAVA_CLASS );
		}
		catch ( ClassNotFoundException e )
		{
			
			throw new MetaDataException( new String[]{name, javaClass},
					MetaDataException.DESIGN_EXCEPTION_JAVA_CLASS_LOAD_ERROR );
		}