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Java

Java static code analysis

Unique rules to find Bugs, Vulnerabilities, Security Hotspots, and Code Smells in your JAVA code

  • All rules 733
  • Vulnerability60
  • Bug175
  • Security Hotspot40
  • Code Smell458

  • Quick Fix 65
Filtered: 9 rules found
unpredictable
    Impact
      Clean code attribute
        1. Tests should be stable

           Code Smell
        2. Mutable fields should not be "public static"

           Code Smell
        3. Private mutable members should not be stored or returned directly

           Code Smell
        4. "Iterator.next()" methods should throw "NoSuchElementException"

           Bug
        5. "compareTo" results should not be checked for specific values

           Bug
        6. Classes and methods that rely on the default system encoding should not be used

           Code Smell
        7. String operations should not rely on the default system locale

           Code Smell
        8. Execution of the Garbage Collector should be triggered only by the JVM

           Code Smell
        9. The "Object.finalize()" method should not be overridden

           Code Smell

        "Iterator.next()" methods should throw "NoSuchElementException"

        consistency - conventional
        reliability
        Bug
        • error-handling
        • unpredictable

        Why is this an issue?

        More Info

        The java.util.Iterator.next() method must throw a NoSuchElementException when there are no more elements in the iteration. Any other behavior is non-compliant with the API contract and may cause unexpected behavior for users.

        Noncompliant code example

        public class MyIterator implements Iterator<String> {
          public String next() {
            if (!hasNext()) {
              return null;
            }
            // ...
          }
        }
        

        Compliant solution

        public class MyIterator implements Iterator<String> {
          public String next() {
            if (!hasNext()) {
              throw new NoSuchElementException();
            }
            // ...
          }
        }
        
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          Available Since
          9.1
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          Developer Edition
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