(JavaReflectionExample2.java:17)Īt 2.main(JavaReflectionExample2. The actual error message (stack trace) is as follows: One can also determine whether an interface is an annotation type. If we call any other method on the List interface: assertThatThrownBy(proxy::isEmpty).isInstanceOf(RuntimeException.class) Since the proxy throws an unchecked exception, Java lets the exception to propagate as-is. Here's the line of code that actually throws the exception:īecause this method ( fooMethod) doesn't exist, a NoSuchMethodException is thrown. Enhancements in Java SE 6 Enhancements in J2SE 5.0. This is happening because we somehow throw a checked exception without declaring it in the method declaration. In this example I intentionally create a NoSuchMethodException by trying to instantiate a method named fooMethod on the class. throws IllegalArgumentException Thrown if an illegal argument is given throws InvocationTargetException Thrown if the property accessor method throws an exception throws ClassNotFoundException occurs if a given class cannot be located by the specified class loader throws InstantiationException Thrown if one of the following. Method m = c.getDeclaredMethod("fooMethod", paramTypes) The following example Java class shows how this NoSuchMethodException can be generated: The problem is that the version of CarPark.in youre trying to get takes a primitive integer, and getDeclaredMethod is looking for one that takes a, which is not the same thing.If you pass int.class or Integer.TYPE to getDeclaredMethod, youll see that itll be able to find the method correctly. Java exception FAQ: What is a Java NoSuchMethodException?Īnswer: Using Java, you can get a NoSuchMethodException when you're using reflection and try to dynamically use a method on a class, and the method does not actually exist.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |