What are the common causes of NoSuchMethodException in Java?

What are the common causes of NoSuchMethodException in Java?

The NoSuchMethodException exception in Java is one of the common exceptions. It indicates that when calling a method, the corresponding method is not found. This situation usually occurs in the following situations:

1. Method name error

In Java, a method has a unique name. If the method is called When trying to use a name that does not exist, a NoSuchMethodException will occur. This situation is usually caused by the developer mistyping the method name or the method name being modified but the place where it is used is not updated.

2. Method parameter type error

The parameter type of the method is also part of the method. If the parameter type of the method does not match the parameter type passed when calling, it will also cause NoSuchMethodException exception occurs.

3. Access permission issues

In Java, methods have four access permissions, namely public, protected, default and private. If when calling a method, the method you are trying to access is not a public method or is not in the same package, a NoSuchMethodException exception will also occur.

4. Method overloading problem

If there are multiple methods with the same name but different parameters in the class, you need to choose based on the type of parameters passed in when calling the method Specific methods. If the parameter type passed in does not match all methods, a NoSuchMethodException will also be thrown.

5. Class loading problem

If the corresponding class is not loaded correctly when using reflection to call a method, it will also cause a NoSuchMethodException exception.

In summary, NoSuchMethodException exceptions occur for various reasons. If this exception occurs, you can find and solve the problem by troubleshooting the above situations. Of course, it is recommended that developers strictly follow the specifications of method names and parameter types when writing code to avoid such exceptions.

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