S Ry

try to build the application using maven command with -e flag. it will give you details of the root cause.

I tested your code in Eclipse and got output. There was no error.

output from your code

Enter a number 5 Number is odd! Enter a number 6 Entered number is even!!

Can you please add JDK in System Variables and check whether it is working ?

You said 2nd operation is failed but are you getting any exception ?

You can check with mvn install -X to see what error details you get

Apart from using HashSet you can use nested loops to check if there is any duplicate element in the arraylist.

public boolean hasDuplicatesInArrayList(ArrayList<String> list) { for (int i = 0; i < list.size(); i++) {    for (int j = i + 1; j < list.size(); j++) { if (list.get(i) == list.get(j)) {    return true; }    } } return false;    }

I would have used Stored Procedure with Transaction. In such situation Stored Procedure would be optimum.