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exception

 
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my all transactions within pages are working when i am performing once but when again i give url to run the page or refresh my page to run again it is giving following error


HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

java.lang.ClassCastException: java.lang.Integer
InfonetFilter.doFilter(InfonetFilter.java:29)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.18 logs.
Apache Tomcat/6.0.18



what is it.
to run my program again i have to restart my computer.
 
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to run my program again i have to restart my computer.

Do you really have to restart your machine? I think you meant restarting your tomcat server. The issue is ClassCastException.
 
Megha Singhal
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Piyush Mangal wrote:

to run my program again i have to restart my computer.

Do you really have to restart your machine? I think you meant restarting your tomcat server. The issue is ClassCastException.



actualy i am working on my college server so i can't restart server so i have to restart the computer to restart server

why this exception is coming.
is there any problem in code?
 
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the problem is in InfonetFilter.java line number 29, where you are casting into Integer.
 
Megha Singhal
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Anurag Verma wrote:the problem is in InfonetFilter.java line number 29, where you are casting into Integer.



is there is any problem in the session in my first servlet i am setting session like following



and in my second servlet i am getting session like following
 
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Megha Singhal wrote:

Anurag Verma wrote:the problem is in InfonetFilter.java line number 29, where you are casting into Integer.



is there is any problem in the session in my first servlet i am setting session like following



and in my second servlet i am getting session like following


please tell me how can i maintain session from one servlet to another, i have done through above method but its not working.
 
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Paste line 29 of InfonetFilter.java
and
try to change your second servlet to
int ccno=Integer.parstInt(session.getAttribute("ccno"));

i think it might work.
 
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sanket singh wrote:Paste line 29 of InfonetFilter.java
and
try to change your second servlet to
int ccno=Integer.parstInt(session.getAttribute("ccno"));

i think it might work.



this is giving me following error


Ben.java:25: cannot find symbol
symbol : method parstInt(java.lang.Object)
location: class java.lang.Integer
int ccno=Integer.parstInt(session.getAttribute("ccno"));
^
1 error

 
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Do you really need us to check your spelling?
 
Megha Singhal
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Bear Bibeault wrote:Do you really need us to check your spelling?


sorry i didn't observe that.
i correct it but it is still giving error.
actualy waht i observe is that http session is not working on my server, when i trying to redirect to any jsp or any other servlet page it is still giving the same error and when i diasabled those line where i made httpsession in first servlet its redirecting to any of the page.
so is there is any alternative of http session to make session for the integer variable.
 
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You don't need an alternative to HttpSession, you need to fix whatever problem your code has in using it.
 
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just try with session.putValue() method and get the session value using session.getValue()
 
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Eshwin Sukhdeve wrote:just try with session.putValue() method and get the session value using session.getValue()


Those methods are deprecated and should not be used. See the HttpSession.
 
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Megha Singhal wrote:

Bear Bibeault wrote:Do you really need us to check your spelling?


sorry i didn't observe that.
i correct it but it is still giving error.
actualy waht i observe is that http session is not working on my server, when i trying to redirect to any jsp or any other servlet page it is still giving the same error and when i diasabled those line where i made httpsession in first servlet its redirecting to any of the page.
so is there is any alternative of http session to make session for the integer variable.



if you are using this line of code
"int ccno=Integer.parseInt(session.getAttribute("ccno")); "

then it will through an exception at runtime because in method parseInt ,argument has to be a string not a int or Integer or anything else.
So make sure when you are setting an attribute in the session it must be of type Integer and when you are using getAttribute() method, type cast it to Integer , as the return type of this method is Object.
If you do this it will surely work.
 
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avneesh atri wrote:

Megha Singhal wrote:

Bear Bibeault wrote:Do you really need us to check your spelling?


sorry i didn't observe that.
i correct it but it is still giving error.
actualy waht i observe is that http session is not working on my server, when i trying to redirect to any jsp or any other servlet page it is still giving the same error and when i diasabled those line where i made httpsession in first servlet its redirecting to any of the page.
so is there is any alternative of http session to make session for the integer variable.



if you are using this line of code
"int ccno=Integer.parseInt(session.getAttribute("ccno")); "

then it will through an exception at runtime because in method parseInt ,argument has to be a string not a int or Integer or anything else.
So make sure when you are setting an attribute in the session it must be of type Integer and when you are using getAttribute() method, type cast it to Integer , as the return type of this method is Object.
If you do this it will surely work.


if i am doing that as per you are saying it is giving following error


Ben.java:28: incompatible types
found : java.lang.Object
required: int
int ccno=session.getAttribute("ccno");
^
1 error

 
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Read the javadocs of HttpSession to find out what data type HttpSession.getAttribute returns. You seem to have removed a critical piece that was present in your earlier code.
 
Megha Singhal
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Tim Moores wrote:Read the javadocs of HttpSession to find out what data type HttpSession.getAttribute returns. You seem to have removed a critical piece that was present in your earlier code.


it is saying "Returns the object bound with the specified name in this session" so in my code it should return int value
so if i am doing following

then it is giving following compilation error


Ben.java:28: incompatible types
found : java.lang.Object
required: int
int ccno =session.getAttribute("ccno");
^
1 error

 
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avneesh atri
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Megha Singhal wrote:

avneesh atri wrote:

Megha Singhal wrote:

Bear Bibeault wrote:Do you really need us to check your spelling?


sorry i didn't observe that.
i correct it but it is still giving error.
actualy waht i observe is that http session is not working on my server, when i trying to redirect to any jsp or any other servlet page it is still giving the same error and when i diasabled those line where i made httpsession in first servlet its redirecting to any of the page.
so is there is any alternative of http session to make session for the integer variable.



if you are using this line of code
"int ccno=Integer.parseInt(session.getAttribute("ccno")); "

then it will through an exception at runtime because in method parseInt ,argument has to be a string not a int or Integer or anything else.
So make sure when you are setting an attribute in the session it must be of type Integer and when you are using getAttribute() method, type cast it to Integer , as the return type of this method is Object.
If you do this it will surely work.


if i am doing that as per you are saying it is giving following error


Ben.java:28: incompatible types
found : java.lang.Object
required: int
int ccno=session.getAttribute("ccno");
^
1 error




This is because you are not type casting it to Integer class. I think i have mentioned that in my post . try it ,it will work
 
Tim Moores
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Megha Singhal wrote:

Tim Moores wrote:Read the javadocs of HttpSession to find out what data type HttpSession.getAttribute returns. You seem to have removed a critical piece that was present in your earlier code.


it is saying "Returns the object bound with the specified name in this session" so in my code it should return int value


No, the method signature specifically says that it returns java.lang.Object. So if you want to use it as anything other than an Object you need to typecast it.
 
Megha Singhal
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Swastik Dey wrote:


still same problem
not working
 
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Megha Singhal wrote:

Swastik Dey wrote:


still same problem
not working


That's not a cast. Although it would still probably work if the attribute was an Integer value.

The important thing is to work out exactly what session.getAttribute("ccno") is returning. Get your code to print out or log the value and the type, and that
 
Swastik Dey
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What exactly do you mean by not working? Throwing any exception? Make sure that you are getting the value in the session scoped variable ccno.


 
Megha Singhal
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Matthew Brown wrote:

Megha Singhal wrote:

Swastik Dey wrote:


still same problem
not working


That's not a cast. Although it would still probably work if the attribute was an Integer value.

The important thing is to work out exactly what session.getAttribute("ccno") is returning. Get your code to print out or log the value and the type, and that



my first servlet is following


then i am calling following servlet

and i am getting value on this page
my next servlet is following

on this page i am getting following error


HTTP Status 500 -

--------------------------------------------------------------------------------

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

java.lang.ClassCastException: java.lang.Integer
InfonetFilter.doFilter(InfonetFilter.java:29)


note The full stack trace of the root cause is available in the Apache Tomcat/6.0.18 logs.


--------------------------------------------------------------------------------

Apache Tomcat/6.0.18


 
Swastik Dey
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From the log stack trace it seems that you don't have exception in any of the above two codes.

java.lang.ClassCastException: java.lang.Integer
InfonetFilter.doFilter(InfonetFilter.java:29)


rather in a file InfonetFilter.java. What code do you have in that file in line number 29?
 
Megha Singhal
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Swastik Dey wrote:From the log stack trace it seems that you don't have exception in any of the above two codes.

java.lang.ClassCastException: java.lang.Integer
InfonetFilter.doFilter(InfonetFilter.java:29)


rather in a file InfonetFilter.java. What code do you have in that file in line number 29?



i don't have that java file. that is might be on the server.
 
Swastik Dey
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Unless you find out what is happening there, it's difficult to resolve the issue.
 
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I think you are getting confused by the objects being returned from session.getAttribute(String). Every item returned by the getAttribute method is an instance of java.lang.Object. When you cast it, you need to cast it back to the same type it was before you added it to the session (with session.setAttribute(String, Object)).

In your case, you are adding an int primitive type, which gets automatically "upgraded" to an Integer (because we need a java.lang.Object, not a primitive type).

At this point, you've added an Integer object to your session. Why bother casting or converting to a String, just to get it's primitive int value? Can't you cast to the Integer object, and then get the int value from that Integer Object?

Also, I notice that when people suggest you "cast" your Object to something else, you are instead calling a method like the Object's .toString(). I just have to ask - are you familiar with casting in Java?
 
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