Problem in getting object while shifting from java1.4 to java1.6!!

hi all, i stored my object in file using serialization in java1.4. now i am shifting to java1.6 and when i am reteriving the object, i am getting the exception
java.io.InvalidClassException:data.SessionDVO; local class imcompatible; stream classdesc serialVersionID= -78952647 .... , local class serialVersionID= 45628....
This is the version id error. One solution is to define the class versionID in SessionDVO class which static and final, so cant be changed at runtime. but since i didnt define it earlier in SessionDVO class , so while reteriving the object , i am getting this error.
Can anyone help me in this case???
below is the code which im using for reteriving the object
                                        FileInputStream fis = new FileInputStream(filePath);
                                        ObjectInputStream in = new ObjectInputStream(fis);
                                        SessionDVO session = (SessionDVO)in.readObject();

hi dear on windows when i am using Mac serialVersionID it gives me this error
java.io.InvalidClassException: data.SessionDVO; local class incompatible: stream classdesc serialVersionUID = 4640646385536229406, local class serialVersionUID = -3687353918251388251
private static final long serialVersionUID = 4640646385536229406L;
when i change versionID to this versionID on windows it shows me error
java.io.InvalidClassException: javax.swing.text.AbstractDocument; local class incompatible: stream classdesc serialVersionUID = -116069779446114664, local class serialVersionUID = 6842927725919637215when i use versionId below one
private static final long serialVersionUID = -116069779446114664L;
then it shows me this error
java.io.InvalidClassException: data.SessionDVO; local class incompatible: stream classdesc serialVersionUID = 4640646385536229406, local class serialVersionUID = -116069779446114664now i am confused which i should use here???

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