Error 500 Java.util.nosuchelementexception
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Java How to fix java.util.NoSuchElementException in Java java.util.NoSuchElementException is a RuntimeException which can be thrown by different classes in Java like Iterator, Enumerator, Scanner or StringTokenizer. All of those classes has method to fetch next element or next tokens if underlying data-structure doesn't have any element Java throws "java.util.NoSuchElementException". Most common example of this iterating over hashmap without checking if there is any element or not and that's why it's advised to use hashNext() before calling next() http://stackoverflow.com/questions/19711841/java-util-nosuchelementexception-error-looked-for-possible-reasons-still-cant on Iterator. In this Java tutorial we will what causes NoSuchElementException in Java and how to avoid it completely. Cause of Exception in thread "main" java.util.NoSuchElementException: here are possible cause of java.util.NoSuchElementException in Java: 1) As per Javadoc NoSuchElementException is thrown if you call nextElement() method of Enumeration and there is no more element in http://javarevisited.blogspot.com/2012/02/how-to-solve-javautilnosuchelementexcep.html Enumeration. below code will throw java.util.NoSuchElementException because Enumeration of hastable is empty. public class NoSuchElementExceptionDemo{ public static void main(String args[]) { Hashtable sampleMap = new Hashtable(); Enumeration enumeration = sampleMap.elements(); enumeration.nextElement(); //java.util.NoSuchElementExcepiton here because enumeration is empty } } Output: Exception in thread "main" java.util.NoSuchElementException: Hashtable Enumerator at java.util.Hashtable$EmptyEnumerator.nextElement(Hashtable.java:1084) at test.ExceptionTest.main(NoSuchElementExceptionDemo.java:23) Here is another example of java.util.NoSuchElementException which will be thrown because we are calling next() method of Iterator which doesn't contain any element: public class NoSuchElementExceptionExample { public static void main(String args[]) { HashMap sampleMap = new HashMap(); Iterator itr = sampleMap.keySet().iterator(); itr.next(); //java.util.NoSuchElementExcepiton here because iterator is empty } } Exception in thread "main" java.util.NoSuchElementException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:796) at java.util.HashMap$KeyIterator.next(HashMap.java:828) at test.NoSuchElementExceptionExample.main(ExceptionTest.java:22 In order to avoid these NoSuchElementException always call Iterator.hasNext() or Enumeration.hasMoreElements() before calling next() or nextElement() method. java.util.StringTokenizer can also throw NoSuchElementException if there is no more token or element and you call nextToken() or nextEl
Field| Constr| Method compact1, compact2, compact3 java.util Class NoSuchElementException java.lang.Object java.lang.Throwable java.lang.Exception java.lang.RuntimeException java.util.NoSuchElementException All Implemented Interfaces: Serializable Direct Known Subclasses: InputMismatchException public class NoSuchElementException extends RuntimeException Thrown error 500 by various accessor methods to indicate that the element being requested does not exist. Since: JDK1.0 See Also: Enumeration.nextElement(), Iterator.next(), Serialized Form Constructor Summary Constructors Constructor and Description error 500 java.util.nosuchelementexception NoSuchElementException() Constructs a NoSuchElementException with null as its error message string. NoSuchElementException(Strings) Constructs a NoSuchElementException, saving a reference to the error message string s for later retrieval by the getMessage method. Method Summary Methods inherited from classjava.lang.Throwable addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString Methods inherited from classjava.lang.Object clone, equals, finalize,