Class java.lang.AbstractMethodError

java.lang.Object
   |
   +----java.lang.Throwable
           |
           +----java.lang.Error
                   |
                   +----java.lang.LinkageError
                           |
                           +----java.lang.IncompatibleClassChangeError
                                   |
                                   +----java.lang.AbstractMethodError

public class AbstractMethodError
extends IncompatibleClassChangeError

Thrown when an application tries to call an abstract method. Normally, this error is caught by the compiler; this error can only occur at run time if the definition of some class has incompatibly changed since the currently executing method was last compiled.