Serialize subclasses recursively in PostgreSQL db??

Hello,

i have the following problem:

I want to store an instance of a class, including it's subclass in a
PostgreSQL database. Does anybody have a sollution for this (see
example beneath)?????

Example:
______________________________________________
Class 1:
--------
public class Test implements java.io.Serializable
{
public String value;
public SubTest b;
public int oid = 0;

public Test()
{
value = "init";
b = new SubTest();
}

public String getValue()
{
return value;
}
}
_________________________________________________
Class 2:
--------
public class SubTest implements java.io.Serializable
{
public String value;
public int oid = 0;

public SubTest()
{
value = "string subtest";
}

public String getValue()
{
return value;
}
}
__________________________________________________

I adjusted Serializa.java that it sees the SubClass, and storing this
one is no problem, BUT storing the oid of Test afterwards is giving me
troubles.

Does anyone know a sollution? Thanxs, you can help me a lot with it.

G.