data from servlet to jsp

I am a beginner in programming with servlets and jsp. I am creating a servlet and in the servlet I am creating an attribute and sending its value to a jsp page.
The attribute's value is then displayed on the jsp page. However, when displaying the value, null is being displayed and I cannot understand why.

below is the code for the servlet and the jsp:

ServletTest.java

index.jsp

Which one is executed first, servlet or jsp? Another point, avoid using java code in jsp. Use JSTL/EL or custom tags etc.

Attributes and Parameters are NOT the same thing.

Parameters are extracted from the user's request - Attributes can be attached to a request by your code.

Your code is not allowed to add Parameters to a request, the map of parameters is immutable.

See the JavaDocs for javax.servlet.ServletRequest

Bill

Also, your form action is incorrect. It should be "${pageContext.request.contextPath}/ServletTest". Without those {}, the $ only applies to pageContext, and the form action would be the page context's String representation followed by ".request.contextPath/ServletTest".

thanks for your replies. I modified the getAttribute and setAttribute methods, however with the "${pageContext.request.contextPath}/ServletTest" I am getting an error telling me that there is a whitespace in path and I cannot understand why.

index.jsp

ServletTest.java

What's the name of your web application?

Scriptlets are dead. Use the EL. To access the value of a scoped variable named "hello" you would use ${hello}.

thanks for your replies, it worked now