Mysterious Eclipse JSP Validation Errors

Question

Eclipse (Helios) occasionally marks valid looking JSP content as having errors. It seems like it often breaks when I use the tag. For example, in a JSP with just th

Answer 1

In order to fix:
- javax.servlet.jsp.* needs jsp-api.jar
- javax.servlet.http.* needs servlet-api.jar

You need to add these libraries to Java Build path in project setup. These libraries can be found in tomcat/lib directory (for Tomcat 6.0).