java.lang.NoSuchMethodErrorThe Java lang NoSuchMethodError is a runtime error. The error happens whenever the compiler cannot locate any method being called. It is a Java error that happens whenever a method which exists during compilation time does not exist at run time. In other words, the user invokes a method which exists during compilation time but is not present at run time. It signifies that the method we are calling does not exist at runtime, resulting inside the Java lang NoSuchMethodError. The method can either be an instance or a static method. Introduction to Java Class NoSuchMethodErrorWe interact with classes and associated methods a lot as developers. We develop a class and a method inside the class. Inside the main function, we construct a class object then call the method upon that. However, we may have to delete this function later in our software. Whenever we delete this method but continue to call it in your main function, an error is raised. It is a java.lang.NoSuchMethod error, as you rightly suspected. The java.lang.NoSuchMethodError is indeed a runtime error that happens whenever the application attempts to execute a method that doesn't exist in the class. That error is usually seen during the compilation process, but it may also found during the runtime. As just a result, any user calls a method which exists during compilation time but is not present at run time, resulting in this error. It signifies that the method we were calling doesn't really exist at runtime, resulting in the Java lang NoSuchMethodError. The method can either be an instance or a static method. The Java lang NoSuchMethodError could be thrown for a variety of causes, such as when the code is partially built or when the description of a class has been incompatiblely modified (that means earlier the class definition was different, but now it is changed by the user). Several factors will be examined in detail in the next section. Error HierarchyThe inheritance tree of the NoSuchMethod error in Java is illustrated here. As a result, the IncompatibleClassChangeError and LinkageError are included in the Java.lang.NoSuchMethodError inheritance tree. These issues listed above are caused by incompatible class modifications made after compilation. All Implemented InterfacesIn Java, most implemented interfaces are indeed the Serializable interface. It is part of the java.io package. Serializable is indeed a type of marking interface. There aren't any methods or fields inside a Marker Interface. As just a result, classes which implement it aren't required to implement any methods. When classes want their instances to also be Serialized or Deserialized, they must implement the Serializable interface. ConstructorsThe constructors related with the NoSuchMethodError in Java are listed in the table below.
Method in Java Class NoSuchMethodErrorThe Java class NoSuchMethodError has methods inherited from of the classes java.lang.Throwable and java.lang.Object. We will go through a few of the methods inherited out of each class in depth. Some Methods Inherited from Class java.lang.Throwable that are listed below
Some Methods Inherited From Class java.lang.Object that are listed below
Constructors
What is the reason for Java Class NoSuchMethodError?Whenever the Java Class NoSuchMethodError exception is issued, this indicates that the application did not recognize the method at runtime. This issue may occur if your code is partially recompiled. Other factors involve: Breaking change in third party libraryWhenever our software uses a method inside a third-party library that has been present during build time but not during runtime, this java.lang error occurs. NoSuchMethodError. This implies that now the method being called has been deleted by the third-party library. The above suggests a build problem because the method exists during compile time but not at runtime. This is possible that perhaps the version of the library utilized during the build differs from the version of the software. Overriding third-party library versionWhenever a third-party library is utilised inside the software, it might generate the Java lang NoSuchMethodError. That version, for example, could be a dependency on some other third-party libraries which utilise a different version of such a library. Version conflicts can be avoided by utilising technologies such as Maven or Apache. How to Solve NoSuchMethodErrorThe actions you take to resolve the Java.lang. The syntax for NoSuchMethodError is as follows: To do a full clean and compile:To resolve this NoSuchMethodError, conduct a complete clean and afterwards recompile the projects containing the called and calling classes. It ensures the most recent version of the classes are utilised. Fix the third-party library version issuesIf the problem occurs as a result of using a third-party library method, we can solve the issue by determining whether library includes the called class and method. By using -verbose:class, the user can obtain information about libraries to load the class. Examples on Java Class NoSuchMethodError:In this program, we will look at an example of a game-changing alteration. We declare two classes, of which the first is a helper class with a method. Then we'll define our Main class and construct the helper class's object inside the Main class. We'll call a method just on newly formed object that doesn't belong to the helper class. This will result in a NoSuchMethodError. Filename: NoSuchMethodError.java Output: public class Main { ^ /tmp/ghTvaEUC9E/NoSuchMethodError.java:14: error: cannot find symbol A.print("Java"); ^ symbol: method print(String) location: variable A of type NoSuchMethodError 2 errors According to the above example, we had built a class NoSuchMethodError and defined a method inside it. Now we'll build the main function and populate with an object from such a class. Then we'll call a method upon that newly formed object that isn't part of the helper class. It will result in a NoSuchMethodError in the output. Filename: NoSuchMethodError.java Output: String obtained is Java In the following code, we followed the same process like in the previous example. The one and only difference is that we're calling the method defined inside the class description. This one will resolve the NoSuchMethodError and produce the expected result. NoSuchMethodException vs NoSuchMethodErrorWe're all familiar with the NoSuchMethodError, that happens whenever a compiled Java class makes a typical method call to another class and the method doesn't exist. NoSuchMethodException could be generated while calling a method through reflection as well as the method name is derived from a variable in your application. Conclusion
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