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L2J Revision 5375:
L2JDP Revision 8868:

GlobalVariablesManager: problem while saving variables: com.mysql.jdbc.MysqlData
Truncation: Data truncation: Data too long for column 'var' at row 1

and what is the variable that are you trying to save ?

current limit is 20 for var and 255 for value.

which is exactly what I've gone and I have done wrong