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    Java does not handle IPv6 nameservers before 1.8.0_60. Upgrade to the latest JVM.

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    You try to parse a String that contains non-numeric characters to an int. The string must contain decimal characters only, optionally beginning with a + or - sign.

Solutions on the web

via Oracle Community by 807595, 1 year ago
For input string: "quit" There was a NumberFormatException. You can look that up in the API, but you can see what it means: a problem with the format of a number. It tried to read a number in a String, but found garbage instead. It even shows you the garbage: "quit", which of course isn't a number.
via Oracle Community by 843810, 2 years ago
For input string: "Enter the beggining balance" You passed a textual string to a method that wanted a numeric string, so it thew this exception. In this case, the "number" was in the string "Enter the beggining balance". Clearly, that's not a number.
via Coderanch by Elinor Chang, 1 year ago
For input string: "0.0000000000null"
via Xamarin Bugzilla by bryan.moulton, 11 months ago
java.lang.NumberFormatException: For input string: "quit"There was a NumberFormatException. You can look that up in the API, but you can see what it means: a problem with the format of a number. It tried to read a number in a String, but found garbage instead. It even shows you the garbage: "quit", which of course isn't a number. at java.lang.NumberFormatException.forInputString(NumberFomatException.java:48) at java.lang.FloatingDecimal.readJavaFormatString(Floatingecimal.java:1213) at java.langDouble.parseDouble(Double.java:202)