HTTP Status 500 - String index out of range: -3

type Exception report

message String index out of range: -3

description The server encountered an internal error that prevented it from fulfilling this request.

exception

java.lang.StringIndexOutOfBoundsException: String index out of range: -3

java.lang.String.substring(Unknown Source)

com.lib.DecryptUtil.fileDecrypt(DecryptUtil.java:31)

com.encrypt.Action.execute(Action.java:59)

sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source)

sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

java.lang.reflect.Method.invoke(Unknown Source)