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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