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Join Date: Nov 2007
Posts: 3
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Newbie Poster
hey guys,
I'm realtively new to jsp, and I want to create java objects and use them later in the jsp code.
Here's what I do:
However, I get errors of the sort:
I'm realtively new to jsp, and I want to create java objects and use them later in the jsp code.
Here's what I do:
<%!
public static java.util.List attrTypesArray = new java.util.ArrayList(50);
public static boolean myBool;
attrTypesArray.add("aaaa");
pageContext.setAttribute("attrTypesArray", attrTypesArray);
pageContext.setAttribute("myBool", myBool);
myBool = attrTypesArray.contains("aaaa");
%>
<c:out value='${myBool}'/>However, I get errors of the sort:
Unable to compile class for JSP: An error occurred at line: 65 in the jsp file: /file.jsp Syntax error on token(s), misplaced construct(s)
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Join Date: Mar 2007
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Junior Poster
<%! %> tags are used for declarations. I recommend you don't use this for anything other than declaring your variables, and this is probably the cause of your issues.
Just use normal scriptlets <% %> for your actual statements.
Good luck
Just use normal scriptlets <% %> for your actual statements.
Good luck
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Join Date: Nov 2007
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Newbie Poster
hey, you are right abut the declaration tags. However the problem seems to be different - I cannot mix jsp and jstl tags (particularly, I cannot use the myBool variable in the c:out tag)
Therefore I still need your help. I have to go through the elements of a collection (preferably using jstl <c:forEach>) but for each element I want to check whether I have already passed through another one with the same attribute_1. If yes, then I print it's attribute_2, if not - I print both attributes.
So, obviously I need to keep track whether another element with the same attribute_1 has been already checked in the "forEach" loop. Hence, I think I should use a container like ArrayList or something similar to check whether myArrayList.contains(myAttribute_1).
Is there a way to keep track of these attributes in jstl, or I should use pure jsp ?!?
... or can I create the ArrayList in jsp and then somehow use it within the jstl <c:forEach> tag?
maybe my problem description is a littel confusing - sorry - just ask if you don't understand something.
Pesho
Therefore I still need your help. I have to go through the elements of a collection (preferably using jstl <c:forEach>) but for each element I want to check whether I have already passed through another one with the same attribute_1. If yes, then I print it's attribute_2, if not - I print both attributes.
So, obviously I need to keep track whether another element with the same attribute_1 has been already checked in the "forEach" loop. Hence, I think I should use a container like ArrayList or something similar to check whether myArrayList.contains(myAttribute_1).
Is there a way to keep track of these attributes in jstl, or I should use pure jsp ?!?
... or can I create the ArrayList in jsp and then somehow use it within the jstl <c:forEach> tag?
maybe my problem description is a littel confusing - sorry - just ask if you don't understand something.
Pesho
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Join Date: Feb 2006
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Well, don't mix them. Eliminate the scriptlets altogether. You should be doing this stuff in Beans, and the like.
Java Programmer and Sun Systems Administrator
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Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
--Brian Kernighan
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Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
--Brian Kernighan
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Join Date: Nov 2007
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Newbie Poster
ok
but what if in the JSP tags I want to use info passed by the servlet?
For instance, in my servlet I have the following:
Now in the jstl tags of myJSP.jsp I can use the following:
BUT I cannot use the following:
... it complains that myAnimal cannot be resolved
Could you please explain why I cannot use "myAnimal" in the plain JSP tags???
Thans a lot ! ! !
but what if in the JSP tags I want to use info passed by the servlet?
For instance, in my servlet I have the following:
Animal myAnimal = new Animal();
// Set attributes
request.setAttribute("myAnimal", myAnimal);
getServletContext().getRequestDispatcher("/myJSP.jsp").forward(request, response);Now in the jstl tags of myJSP.jsp I can use the following:
<c:forEach items='${myAnimal.body.legs}' var="leg">
......
</c:forEach>BUT I cannot use the following:
<% for(int i=0; i<myAnimal.getBody().getLegs().length; i++) { %>
......
<% } %>Could you please explain why I cannot use "myAnimal" in the plain JSP tags???
Thans a lot ! ! !
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