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Thread: issue with scanner class-resource leak

  1. #1
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    Default issue with scanner class-resource leak

    Hi everyone, i am new to the forum. I am currently in the middle of an Oracle course and i am having an issue with one of my assignments.
    It runs fine in Eclipse but not in the Cmd line. I have searched for days on how to fix the issue with no results so i am hoping that someone here may be kind enough to help me.

    public class Calc {

    public static void main(String[] args) {

    Scanner items = new Scanner(System.in); // resource error occurs on this line "resource leak:'items' is never closed
    double firstnumber, secondnumber, thirdnumber, answer;
    System.out.println("Enter first number");
    firstnumber = items.nextDouble();
    System.out.println("Enter second number");
    secondnumber = items.nextDouble();
    System.out.println("Enter third number");
    thirdnumber = items.nextDouble();
    answer = firstnumber + secondnumber + thirdnumber;
    System.out.println(answer);


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: issue with scanner class-resource leak

    not in the Cmd line.
    What happens when the code is executed?
    What OS are you are?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: issue with scanner class-resource leak

    Welcome to the forum! Please read this topic to learn how to post code in code or highlight tags and other useful info for newcomers.

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    Default Re: issue with scanner class-resource leak

    Hi I am running windows 8, no error in eclipse, error from cmdline pasted below

    C:\Users\user1\Desktop\Java\Eclipes projects\Assignment 2\src\Calc>javac Calc.ja
    va

    C:\Users\user1\Desktop\Java\Eclipes projects\Assignment 2\src\Calc>java Calc
    Exception in thread "main" java.lang.NoClassDefFoundError: Calc (wrong name: Cal
    c/Calc)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java :800)
    at java.security.SecureClassLoader.defineClass(Secure ClassLoader.java:14
    2)
    at java.net.URLClassLoader.defineClass(URLClassLoader .java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader. java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java: 361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java: 355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.j ava:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:4 25)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:3 58)
    at sun.launcher.LauncherHelper.checkAndLoadMain(Launc herHelper.java:482)


    C:\Users\user1\Desktop\Java\Eclipes projects\Assignment 2\src\Calc>

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    Super Moderator Norm's Avatar
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    Default Re: issue with scanner class-resource leak

    java.lang.NoClassDefFoundError: Calc (wrong name: Calc/Calc)
    It looks like the class is in a package. Remove the package statement and redo the javac and java steps and it should work.

    Otherwise when using the java command, set the classpath to the folder containing the Calc folder and include the package name on the commandline: java Calc.Calc
    If you don't understand my answer, don't ignore it, ask a question.

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