taglib prefix not accessible in included jsp

Question

I have a JSP in which I declare taglib prefix for spring tags (form, spring). In this JSP I included a new jsp (a.jsp). When I try to use form tag in a.jsp, it is not accesible in a.jsp. I use <form:textarea..... in a.jsp. Instead of generating html code(<textarea ...) it just output <form:textarea...... When I include same taglib in a.jsp (included jsp) then it throws an error.