About Question enthuware.jwpv6.2.1136 :

[himaiMinh]

FYI, I tried to run this code.
I got this error:

Stacktrace:] with root cause
org.apache.jasper.JasperException: Unable to compile class for JSP:

An error occurred at line: 8 in the jsp file: /index.jsp
sb cannot be resolved to a variable
5: <jsp:useBean id = "sb" class="java.lang.StringBuffer" />
6: sb.append("Hello");
7: <%}%>
8: <%=sb%>

[himaiMinh]

If I remove <%=sb%>

Code: Select all

 <% { %>
 <jsp:useBean id = "sb" class="java.lang.StringBuffer" />
   sb.append("Hello");
 <%}%>

It prints out

"sb.append("Hello");

[admin]

FYI, I tried to run this code.
I got this error:

Stacktrace:] with root cause
org.apache.jasper.JasperException: Unable to compile class for JSP:

An error occurred at line: 8 in the jsp file: /index.jsp
sb cannot be resolved to a variable
5: <jsp:useBean id = "sb" class="java.lang.StringBuffer" />
6: sb.append("Hello");
7: <%}%>
8: <%=sb%>

Looks like the exact words in the error message have changed between the versions of tomcat but the meaning is the same. sb is undefined or cannot be resolved.
-Paul.

[admin]

If I remove <%=sb%>

Code: Select all

 <% { %>
 <jsp:useBean id = "sb" class="java.lang.StringBuffer" />
   sb.append("Hello");
 <%}%>

It prints out

"sb.append("Hello");

Yes, this is to be expected as per given the explanation.