NoSuchMethodException

NoSuchMethodException is an unchecked exception in Java that occurs at runtime. It signifies that the Java Virtual Machine (JVM) attempted to call a method, but the method could not be found in the specified class. This typically happens when the code is compiled against a certain version of a library or class, but a different, incompatible version is present at runtime.

Several scenarios can lead to this exception. One common cause is a version mismatch between compiled code and the runtime environment. For example, if a program was compiled with a newer version of a library that includes a specific method, but it's run on a system with an older version of that library that lacks the method, a NoSuchMethodException will be thrown. Another possibility is an error in the code itself, such as a typo in the method name or incorrect parameter types when invoking the method. This could also arise from issues with classloading, where the correct version of a class is not loaded by the JVM.

To resolve a NoSuchMethodException, developers usually need to ensure that the versions of all libraries and classes used by the application are consistent between the compilation and runtime environments. This might involve updating libraries, checking the classpath configuration, or carefully reviewing method signatures and names in the source code for any discrepancies. Understanding the exact method call that failed, along with the class and its available methods, is crucial for effective debugging.