NoSuchMethodError using JNA User32 platform map

Question

I received the following error on the first attempt of using the User32.Instance:

Exception in thread \"main\" java.lang.NoSuchMethodError: com.sun.jna.N

Answer 1

Update the maven using below dependency, It worked for me.

    <dependency>
        <groupId>net.java.dev.jna</groupId>
        <artifactId>jna</artifactId>
        <version>4.5.1</version>
    </dependency>

Answer 2

I was able to reproduce this bug by compiling against an old jna package (pre-5.0.0) and a new jna-platform package (5.0.0):

Exception in thread "main" java.lang.NoSuchMethodError: com.sun.jna.Native.load(Ljava/lang/String;Ljava/lang/Class;Ljava/util/Map;)Lcom/sun/jna/Library;
    at com.sun.jna.platform.win32.User32.<clinit>(User32.java:48)
    at sandboxjava.Main.main(Main.java:8)

The issue is that JNA deprecated the Native.loadLibrary method in version 5.0.0 and introduced the Native.load method. The newer jna-platform package uses the new method, but because the jna package is an older version, the load method simply does not exist in the package.

You should either upgrade the jna package to 5.0.0 (latest at the time of writing), or downgrade jna-platform to a pre-5.0.0 version.