How to resolve the error "A JNI error has occurred, please check your installation and try again" when compiling a java program?

Question

Java

I am new to learning Java. Trying to run "hello world!" An example of what I'm running is below.

class hello {

  public static void main(String args[]) {

    System.out.println("Hello, world!");

  }

}

Javac compiles but the generated class is not interpreted. The following error is thrown:

***:~/Documents/JavaSampl$ javac hello.java
***:~/Documents/JavaSampl$ java hello
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: hello has been compiled by a more recent version of the Java Runtime (class file version 54.0), this version of the Java Runtime only recognizes class file versions up to 53.0
  at java.lang.ClassLoader.defineClass1([email protected]/Native Method)
  at java.lang.ClassLoader.defineClass([email protected]/ClassLoader.java:939)
  at java.security.SecureClassLoader.defineClass([email protected]/SecureClassLoader.java:152)
  at jdk.internal.loader.BuiltinClassLoader.defineClass([email protected]/BuiltinClassLoader.java:553)
  at jdk.internal.loader.BuiltinClassLoader.access$200([email protected]/BuiltinClassLoader.java:88)
  at jdk.internal.loader.BuiltinClassLoader$3.run([email protected]/BuiltinClassLoader.java:466)
  at jdk.internal.loader.BuiltinClassLoader$3.run([email protected]/BuiltinClassLoader.java:460)
  at java.security.AccessController.doPrivileged([email protected]/Native Method)
  at jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull([email protected]/BuiltinClassLoader.java:459)
  at jdk.internal.loader.BuiltinClassLoader.loadClassOrNull([email protected]/BuiltinClassLoader.java:406)
  at jdk.internal.loader.BuiltinClassLoader.loadClass([email protected]/BuiltinClassLoader.java:364)
  at jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass([email protected]/ClassLoaders.java:184)
  at java.lang.ClassLoader.loadClass([email protected]/ClassLoader.java:419)
  at sun.launcher.LauncherHelper.loadMainClass([email protected]/LauncherHelper.java:585)
  at sun.launcher.LauncherHelper.checkAndLoadMain([email protected]/LauncherHelper.java:497)

Please tell me how to solve it. Thanks in advance!

Answer 1

In variable environments, you have the first on the list:
and at the end the path to jdk:
Therefore, when the operating system searches for java.exe , it first finds the one in ...\javapath and stops, and you need the one in ...jdk\bin . Therefore, you need to put ...\jdk\bin in environment variables before ...\javapath Like this:

PATH=C:\Program Files\jdk\bin;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files (x86)\QuickTime\QTSystem\