How to handle NoSuchMethodError exception in Java?

How to handle the NoSuchMethodError exception in Java?

In Java program development, we often encounter various exceptions, among which NoSuchMethodError exception is a common one. When we call a method, if the program throws a NoSuchMethodError exception, how should we deal with it?

What is the NoSuchMethodError exception?

NoSuchMethodError exception indicates that the Java virtual machine cannot find the method when trying to call it. Among them, the NoSuchMethodError exception often occurs when the method does not exist or the version does not match. Specifically, for example, sometimes we update dependent libraries and modify the method name or number of parameters in the code, but for some reason, the Java virtual machine still calls the original version of the method, thus throwing a NoSuchMethodError exception.

How to deal with NoSuchMethodError exception?

When the program throws a NoSuchMethodError exception, we must find the problem as soon as possible and fix the code to avoid giving users a bad experience. The specific method of handling the NoSuchMethodError exception is as follows:

1. Check the version of the dependent library

When running a Java program, the dependent library version problem is a common cause of the NoSuchMethodError exception. When we find that the program throws a NoSuchMethodError exception, we should first check whether the relevant dependent library versions are correct. If the version of the dependent library is incorrect, the program needs to be updated and recompiled.

2. Check the methods in the code

When the Java program throws a NoSuchMethodError exception, we must also check whether the method called in the code exists, whether the number of parameters is correct, and whether the method name is correct . If the method name or number of parameters in the code does not match the method in the dependent library, the code needs to be modified to ensure that the method is called correctly.

3. Clean cache

Sometimes the Java virtual machine caches some class information, causing the program to call the old version of the method and throw a NoSuchMethodError exception. To solve this problem, we can clear the virtual machine cache. Specifically, you can add the following parameters before running the Java command:

java -Xnoclassgc

4. Use the class loader

In the Java program, the class loader determines Determine which dependent library version the program uses. If we use the wrong class loader, it may cause the program to throw a NoSuchMethodError exception. Therefore, the correct class loader is also a key to handling NoSuchMethodError exceptions.

Summary

NoSuchMethodError exception is a common exception in Java program development, and it is also a difficult exception to debug. When a NoSuchMethodError exception occurs in a program, we should first check the dependent library version, methods in the code, clear the cache, and use the correct class loader. Only by finding the problem can we fix it in time and ensure the normal operation of the program.

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