code

[Dilshan Edirisuriya]

Problem

Which of the given statements are correct regarding the following JSP page code?

<jsp:useBean id="mystring" class="java.lang.String" />
<jsp:setProperty name="mystring" property="*" />
<%=mystring%>

Assume that the request for this page contains a parameter mystring=hello.


Options

Select 1 correct option.

1. It will print "".


2. It will print "hello"


3. It will not compile.


4. It will throw exception at runtime.

The answer is 1 can some one tell me why is that?

[Dinuka Arsakularatne]

i think that because setProperty is not given inside the <jsp:useBean></jsp:useBean> tags, it basically creates a new property named myString and assigns it an empty string.

Dinuka Arseculeratne

[Dilshan Edirisuriya]

In HFSJ(page 349) it says that "if the bean is already existed,my jsp will reset the existing bean's property value"
So it has to be "hello"

[Deepak Bala]

This code searches for a attribute named mystring in page scope. It wont find it (because mystring came as a parameter). So it creates a new String class under page scope. The set property standard action then tries to set all the properties of the String class from the available params. Thus the option 1 would have to be the answer.

[Dilshan Edirisuriya]

Thank you John I got it