Required property does not have a value

When you compile a JSP file, an exception message appears, as follows:

javax.servlet.ServletException: Required property 'dataSourceName'  
			of Blox 'CommonPresentBlox_data' does not have a value

A required tag property is missing in the tag property section, or the property does not have a value.

Include the property and its value in the tag property section, or give the property a value if it does not have one.