how can i done type castig

i am give my primary key i my hibernate configuration generic type is Long

but one more forms am want to designed.but one primary had Long datatype another form primary key have String type when am intialized on that time we had done typecating and insert and retrive the values succesfully.

but when i want edit the values they gave error like

Caused by: java.lang.NumberFormatException: For input string: "T"
at java.lang.NumberFormatException.forInputString(Num berFormatException.java:48)

Quote:

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java.lang.NumberFormatException: For input string: "T"

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Somewhere in your code, you are trying to convert the letter "T" as a number, which is not valid. If you read the complete track trace you can find the source code line number.