java.lang.NoSuchMethodError

The 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 NoSuchMethodError

We 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 Hierarchy

The inheritance tree of the NoSuchMethod error in Java is illustrated here.

java.lang.Object
    java.lang.Throwable
        java.lang.Error
            java.lang.LinkageError
                java.lang.IncompatibleClassChangeError
                    java.lang.NoSuchMethodError

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 Interfaces

In 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.

Constructors

The constructors related with the NoSuchMethodError in Java are listed in the table below.

Constructor	Description
NoSuchMethodError()	This method creates a NoSuchMethodError without any descriptive notice.
NoSuchMethodError(String s)	This method creates a NoSuchMethodError with a descriptive message.

Method in Java Class NoSuchMethodError

The 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

Method	Description
final void addSuppressed(Throwable exception)	This function is utilized to attach the given exception, which would be supplied as just a parameter, towards the exceptions that have been suppressed in order to produce this expression.
Throwable getCause()	This method returns any reason for the problem or null if the cause is unknown.
Throwable fillInStackTrace()	This method fills in the execution stack trace.
String getMessage()	That function is employed to return the throwable's descriptive message string.
String getLocalizedMessage()	This function is utilized to generate a throwable's localised description.
void printStackTrace(PrintStream s)	This method returns the throwable as well as its backtrace towards the specified print stream.
void setStackTrace(StackTraceElement[] stackTrace)	That function is employed to set the stack trace items returned by getStackTrace() and displayed by printStackTrace() and related methods.
String toString()	It is utilized to return the throwable's description.

Some Methods Inherited From Class java.lang.Object that are listed below

Method	Description
toString()	This function is utilized to return an object's string representation. It is employed to turn an Object into a String.
hashCode()	This function returns its hash code value.
equals (Object obj)	This function compares the two objects and returns true or false when they are equal. It compares the value of both the object on which the method is called towards the value provided by the object supplied as a parameter.
getClass()	This method is utilized to return the object's class object. This also obtains the runtime class of the object from which the method is called.
clone()	To generate an identical replica of this object, were using the clone() method. This creates a new object and duplicates all of this object's data to it.
notify()	This notify() method wakes up the only thread that would be waiting on the object, and also that thread begins execution.
notifyAll()	This notifyAll() method is utilized to start waking up all waiting threads on this object. This function sends a notice to each of an object's waiting threads.
wait()	The wait() method instructs the existing thread to release the lock and sleep.

Constructors

NoSuchMethodError(): This technique generates a NoSuchMethodError with no descriptive notice.
NoSuchMethodError(String s): This method creates a NoSuchMethodError with a descriptive message. 's' is the detailed message in this case.

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 library

Whenever 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 version

Whenever 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 NoSuchMethodError

The 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 issues

If 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

import java.io.*;
class NoSuchMethodError {  
    public void display(String s){
        System.out.println("String obtained is " +s);
    }
}  
public class Main {    
    public static void main(String[] args){
        NoSuchMethodError A = new NoSuchMethodError();
        A.print("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

import java.io.*;
class NoSuchMethodError { 
    public void display(String s){
        System.out.println("String obtained is " +s);
    }
}  
public class Main {   
    public static void main(String[] args){
        NoSuchMethodError A = new NoSuchMethodError();
        A.display("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 NoSuchMethodError

We'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

The java.lang.NoSuchMethodError is indeed an error that happens during runtime. The error occurs whenever the compiler cannot locate the method being called. It is a Java error that happens when a method that exists at compile time does not exist at run time.
The java.lang.NoSuchMethodError can be raised for a variety of causes, including such as when the code is only partially built or if the definition of a class has been incompatiblely modified.
In Java, all implemented interfaces are the Serializable interface. It is part of the java.io package.
To resolve the NoSuchMethodError, perform a complete clean and then recompile the projects containing the called and calling classes. They can also resolve problems using third-party library versions.

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