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Date: Mon, 04 Oct 2010 15:17:54 +0200
From: Ognjen Blagojevic <ognjen.d.blagojevic@gmail.com>
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To: Tomcat Users List <users@tomcat.apache.org>
Subject: Re: Serialization
References: <4CA9D239.6050607@kfo-zmk.uni-kiel.de>
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If I understand correctly both ddm2 and dm5t are defined in .jsp files?

If so, you could separate class definitions from .jsp files.

-Ognjen


On 4.10.2010 15:38, Wolfgang Orthuber wrote:
> w4a.jsp and w4b.jsp are the names of two different jsp files. Both contain
> <%@ include file="wtovedi.jsp" %>
> and the file wtovedi.jsp contains the listed read and write code with
> the definitions of ddm2. ddm2 is a rather complex object of objects, but
> it contains no reference to w4a.jsp or w4b.jsp which are just filenames.
>
> Wolfgang
>
>
> Am 04.10.2010 13:08, schrieb Ronald Klop:
>> What does ddm2 look like? Does it have a reference to the jsp object?
>>
>> Ronald.
>>
>>
>> Op maandag, 4 oktober 2010 15:10 schreef Wolfgang Orthuber
>> <orthuber@kfo-zmk.uni-kiel.de>:
>>>
>>>
>>> Hello,
>>>
>>> my tomcat version is 5.5.17, my question concerns serialization of
>>> objects, below is a code section for writing and reading an object.
>>> If I call write immediately before read:
>>> d5.write();
>>> d5.read();
>>>
>>> then all works fine, but if I use only read (on an formerly written
>>> file) with the same code included in another program module, I got
>>> the exceptions like this:
>>> java.lang.ClassCastException: org.apache.jsp.w.w4a_jsp$1ddm2 cannot
>>> be cast to org.apache.jsp.w.w4b_jsp$1ddm2
>>>
>>> in which w4a.jsp and w4b.jsp are two different modules which include
>>> the same code for read and write. The name of the program module is
>>> stored in the serialized object, but the name of the program module
>>> does not matter, because both modules include the same code.
>>>
>>> Do you know a simple solution which avoids the exception?
>>>
>>> Wolfgang
>>>
>>>
>>>
>>> The code section with read and write:
>>>
>>>
>>> class dm5t implements Serializable {
>>> public ArrayList<ddm2> v5;
>>>
>>> public dm5t () { v5 = new ArrayList<ddm2> (); }
>>>
>>> public String topicpath(){return
>>> getServletContext().getRealPath("")+"/tp/";}
>>>
>>> public synchronized boolean write () {
>>> String fn=fntopics;
>>> boolean ok=true;
>>> try {
>>> String spath = topicpath();
>>>
>>> FileOutputStream fs = new FileOutputStream (spath+fn);
>>> ObjectOutputStream os = new ObjectOutputStream (fs);
>>> os.writeObject (v5);
>>> os.close ();}
>>> catch (IOException e) {ok=false;} return ok;}
>>>
>>> public synchronized boolean read () {
>>> String fn=fntopics;
>>> boolean ok=true;
>>> ArrayList<ddm2> v5tmp=null;
>>> try {
>>> String spath = topicpath();
>>>
>>> FileInputStream fs = new FileInputStream (spath+fn);
>>> ObjectInputStream os = new ObjectInputStream (fs);
>>>
>>> v5tmp = (ArrayList<ddm2>) os.readObject ();
>>> os.close ();
>>>
>>> } catch (IOException e) {ok=false;}
>>> catch (ClassNotFoundException e) {ok=false;}
>>> if (ok) if (v5tmp != null) v5=v5tmp;
>>> return ok;}
>>> }
>>>
>>>
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>>>
>>>
>>
>>
>
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