Exception help required

hi every one
my exception
WHEN ORA_JAVA.EXCEPTION_THROWN then
ex := ORA_JAVA.LAST_EXCEPTION;
message('Exception: '||Exception_.toString(ex));
IMP: i get compile error for Exception_.toString
where Exception_ is the imported java.lang.Exception package.
my java class tries to rename a file in a given path which is passed as parameter.
please help me
thanks in advance
yash

i have done that but when i run the form i get run time exceptions or error the exception handler fails to trap the error raised by java class method , i have simple java class that returns a string called hello and i am un able totrap error using the existing handler please do suggest me some other work around
thanks
yash

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