StackOverflowError with XMLEncoder on my objects.

Works fine when I run the example:
XMLEncoder e = new XMLEncoder(
new BufferedOutputStream(
new FileOutputStream("Test.xml")));
e.writeObject(new JButton("Hello, world"));
e.close()
but when i run my little class I get java.lang.StackOverflowError below.
Could anyone help? (I'm new to XMLEncoder and relatively new to JavaBeans).
Thanks in advance.
Morten
java.lang.StackOverflowError
at java.lang.Class.getMethod0(Class.java:1756)
at java.lang.Class.getMethod(Class.java:963)
at java.beans.Statement.findPublicMethod(Statement.java:230)
at java.beans.Statement.findMethod(Statement.java:270)
at java.beans.Statement.getMethod(Statement.java:366)
at java.beans.Statement.invoke(Statement.java:439)
at java.beans.Expression.getValue(Expression.java:101)
at java.beans.Encoder.getValue(Encoder.java:84)
at java.beans.Encoder.get(Encoder.java:186)
at java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.java:97)
at java.beans.Encoder.writeObject(Encoder.java:55)
at java.beans.XMLEncoder.writeObject(XMLEncoder.java:250)
at java.beans.Encoder.writeExpression(Encoder.java:260)
at java.beans.XMLEncoder.writeExpression(XMLEncoder.java:363)
at java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.java:100)
at java.beans.Encoder.writeObject(Encoder.java:55)
at java.beans.XMLEncoder.writeObject(XMLEncoder.java:250)
at java.beans.Encoder.writeExpression(Encoder.java:260)
at java.beans.XMLEncoder.writeExpression(XMLEncoder.java:363)
at java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.java:100)
at java.beans.Encoder.writeObject(Encoder.java:55)
at java.beans.XMLEncoder.writeObject(XMLEncoder.java:250)
at java.beans.Encoder.writeExpression(Encoder.java:260)
at java.beans.XMLEncoder.writeExpression(XMLEncoder.java:363)
at java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.java:100)
at java.beans.Encoder.writeObject(Encoder.java:55)
at java.beans.XMLEncoder.writeObject(XMLEncoder.java:250)
at java.beans.Encoder.writeExpression(Encoder.java:260)
at java.beans.XMLEncoder.writeExpression(XMLEncoder.java:363)
at java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.java:100)
at java.beans.Encoder.writeObject(Encoder.java:55)
at java.beans.XMLEncoder.writeObject(XMLEncoder.java:250)
at java.beans.Encoder.writeExpression(Encoder.java:260)
at java.beans.XMLEncoder.writeExpression(XMLEncoder.java:363)
at java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.java:100)
at java.beans.Encoder.writeObject(Encoder.java:55)
at java.beans.XMLEncoder.writeObject(XMLEncoder.java:250)
at java.beans.Encoder.writeExpression(Encoder.java:260)
at java.beans.XMLEncoder.writeExpression(XMLEncoder.java:363)
at java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.java:100)
at java.beans.Encoder.writeObject(Encoder.java:55)
at java.beans.XMLEncoder.writeObject(XMLEncoder.java:250)
at java.beans.Encoder.writeExpression(Encoder.java:260)
at java.beans.XMLEncoder.writeExpression(XMLEncoder.java:363)
at java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.java:100)
at java.beans.Encoder.writeObject(Encoder.java:55)
at java.beans.XMLEncoder.writeObject(XMLEncoder.java:250)
at java.beans.Encoder.writeExpression(Encoder.java:260)
at java.beans.XMLEncoder.writeExpression(XMLEncoder.java:363)
at java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.java:100)
...

I think the problem here may be that the BeanBox does not
remove itself as a listener from its components before it
tries to serialise them. The XMLEncoder works out that the
JellyBean and co have listeners (because they are derivatives
of Component - which has a getListeners() method) and will attempt
to serialise those listeners. I suspect that one of these is
the BeanBox itself - or a component inside it. If that component
also knows about the beans it contains there is a possibility
the archiving process will loop - though somthing odd is happening
as the XMLEncoder should detect identical instances in the object
graph and mark them with an "idref" attribute - rather than looping.
It may be that the BeanBox clones part of itself when certain
getters are called. (I don't have your code so this is all a
bit of a guess.)
Anyway, if you want to look at this sort of thing a better
place to start is the BeanBuilder which is availible on the
SwingConnection website. The BeanBox predates all of the
archiving work - whereas the BeanBuilder was purpose built to
demonstrate it and the other new features in SDK 1.4.
Hope that helps.
Philip

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at javax.jdo.JDOException.toString(Unknown Source)
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On Tue, 14 Oct 2003 17:09:43 +0000, Alex Robbins wrote:
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int len = nested==null?0:nested.length;
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StringBuffer sb = new StringBuffer (10 + 100 * len);
sb.append (super.toString());
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String failedToString = null;
try {
failedToString = failed.toString();
} catch (Exception ex) {
failedToString = msg.msg("MSG_ExceptionGettingFailedToString",
ex.toString()); //NOI18N
sb.append (failedToString);
// include nested Throwable information
if (len > 0) {
sb.append (MSG_NESTED_THROWABLES);
Throwable exception = nested[0];
sb.append (exception==null?"null":exception.toString()); //NOI18N
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.and the toString on the Dog does some DB access which fails,
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Alex.
Stephen Kim wrote:
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Alex Robbins wrote:
Hi,
I'm getting a StackOverflowError when I catch a JDOException and try and
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when I try to print the stack trace it gets into an endless loop and I get
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Exception in thread "main" java.lang.StackOverflowError
at java.lang.Exception.<init>(Exception.java:33)
at java.lang.RuntimeException.<init>(RuntimeException.java:38)
at javax.jdo.JDOException.<init>(Unknown Source)
at javax.jdo.JDOCanRetryException.<init>(Unknown Source)
at javax.jdo.JDOUserException.<init>(Unknown Source)
at kodo.util.UserException.<init>(UserException.java:50)
at kodo.util.UserException.<init>(UserException.java:31)
at kodo.runtime.JDOState.error(JDOState.java:407)
at
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at
kodo.runtime.StateManagerImpl.isLoaded(StateManagerImpl.java:980)
at tutorial.Animal.jdoGetname(Animal.java)
at tutorial.Animal.getName(Animal.java:31)
at tutorial.Dog.toString(Dog.java:20)
at tutorial.Animal.toString(Animal.java:49)
at javax.jdo.JDOException.toString(Unknown Source)
at javax.jdo.JDOException.toString(Unknown Source)
at javax.jdo.JDOException.toString(Unknown Source)
at javax.jdo.JDOException.toString(Unknown Source)
at javax.jdo.JDOException.toString(Unknown Source)
at javax.jdo.JDOException.toString(Unknown Source)
at javax.jdo.JDOException.toString(Unknown Source)
at javax.jdo.JDOException.toString(Unknown Source)
at javax.jdo.JDOException.toString(Unknown Source)
at javax.jdo.JDOException.toString(Unknown Source)
at javax.jdo.JDOException.toString(Unknown Source)
at javax.jdo.JDOException.toString(Unknown Source)
at javax.jdo.JDOException.toString(Unknown Source)
at javax.jdo.JDOException.toString(Unknown Source)
.and so on.
The toString method of JDOException does a toString on the associated
persistent object, but in this case the persistent object has been
deleted, so the read from the database fails...
This is not good, because printing an exception should NEVER cause another
exception to be thrown. Exceptions should be caught if the associated
persistent object cannot be printed. My question is: is this a bug in
Sun's JDO code, and could Kodo be modified
[kodo.util.UserException.toString() ?] to avoid this nasty situation?
Regards,
Alex
Steve Kim
[email protected]
SolarMetric Inc.
http://www.solarmetric.com
Patrick Linskey
SolarMetric Inc.

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String name;
int price;
i have created a vector called selectedmag which stores objects of Magazine class... now each object will contain the name and price rite...
i want to print the values stored in vector ie i want to print the vector elements...like
Name: Mag1
Price: 10
which wil be present in object1...
and then
Name: Mag2
Price:15
which wil be present in object2...
and so on...
plz help...
if i give selectedmag.elementAt(position) i am not able to get the above output...plz help me.....
thanks,
Akshatha

hi,
Yes i have used a for loop to print the values... it goes like this
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
class Magazine
     String title;
     int price;
public class sessiontrack1 extends HttpServlet
     public void doPost(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException
          res.setContentType("text/html");
          PrintWriter out=res.getWriter();
          HttpSession session=req.getSession(true);
// This is my vector
Vector myshoppingcart=(Vector)session.getAttribute("ShoppingCart");
          if(myshoppingcart==null)
               myshoppingcart=new Vector();
          Magazine selectedMag=new Magazine();
          selectedMag.title=req.getParameter("Title");
          selectedMag.price=Integer.parseInt(req.getParameter("Price"));
//Putting Magazine object into the vector myshoppingcart
          myshoppingcart.addElement(selectedMag);
          session.setAttribute("ShoppingCart",myshoppingcart);
          out.println("<html><body>U have selected these magazines");
          out.println("<br>");
     //Enumeration vEnum=myshoppincart.elements();
//here a am trying to print output the values
          for(int i=0;i<myshoppingcart.size();i++)
out.println("Name:" + (Magazine)myshoppingcart.elementAt(i));
               out.println("<br>");
out.println("Price:" + (Magazine)myshoppingcart.elementAt(i));
               out.println("<br>");
          out.println("</body></html>");
this is a servlet program.... plz suggest me how to print the values... in the following format
Name: Book1
price: Rs 10
Name:Book2
price:Rs 15
Akshatha

Problem with static and nonstatic objects in same code?

Hi everyone, I am working on a project and I kept running into an odd problem where my code would compile but when I went to run the code I would get an exception. I finally narrowed my problem down to a small fragment. Here is an example.
class Mut{
static Mut Fido = new Mut();
Mut Sammy = new Mut();
public static void main(String args[]){
This piece of code will compile but when I run it on an WindowsXP machine the JRE tells me there is an exception at line 3. If I change the code to this:
class Mut{
static Mut Fido = new Mut();
static Mut Sammy = new Mut();
public static void main(String args[]){
The code runs fine without any problems. My question is: why can't I create a static object and a nonstatic object in the same class? Is this a certain feature of JAVA I don't understand or is this a blackbox problem with XP? Any help is appreciated. Thanks
Vance

Is the exception stack trace what is displayed in the command-line window? If it is here is what is displayed(This is a lot):
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
at Mut.<init>(Mut.java:3)
C:\>
I don't know if this is everything because the winow won't let me scroll back up to where I enterd "java Mut"
Hope this helps.
Message was edited by: Vance
cell@tech

StackOverflowError with XMLEncoder on my objects.

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