How can I take the attribute value from pageContext to the scriptlet code inside my JSP

Question

I have the below piece of scriptlet code in my JSP.

<%   
      String instockMessage = pageContext.getAttribute("instockMessage");
      if ((instockMessage != null) && (instockMessage.trim().length() != 0)) {
            instockMessage = instockMessage.replaceAll("<[^>]*>", "").trim();
            pageContext.setAttribute("instockMessage", instockMessage);

      }
%>

But, I am getting an error saying that “: Type mismatch: cannot convert from Object to String” on compilation.

Does anyone knows how to fix this issue?

Answer 1

This is because the pageContext.getAttribute() returns an Object. You have to Cast the Object to String to fix this issue:

String instockMessage = (String) pageContext.getAttribute("instockMessage");

OR

String instockMessage = pageContext.getAttribute("instockMessage").toString();

That is after modification your final code should look like this:

<%  
    String instockMessage = pageContext.getAttribute("instockMessage").toString();
    if ((instockMessage != null) && (instockMessage.trim().length() != 0)) {
        instockMessage = instockMessage.replaceAll("<[^>]*>", "").trim();
        pageContext.setAttribute("instockMessage", instockMessage);
    }
%>

OR

<%  
    String instockMessage = (String) pageContext.getAttribute("instockMessage");
    if ((instockMessage != null) && (instockMessage.trim().length() != 0)) {
        instockMessage = instockMessage.replaceAll("<[^>]*>", "").trim();
        pageContext.setAttribute("instockMessage", instockMessage);
    }
%>

Answer 2

尝试转换成字符串：

String instockMessage = (String) pageContext.getAttribute("instockMessage");

Answer 3

It's telling you everything you need to know. The attributes from the page context are Objects , you need to downcast to a String . Do a

String instockMessage = (String) pageContext.getAttribute("instockMessage");

But for the sake of everything that is lovely in this world, avoid using scriplets and look into JSTL .