Exception in thread "main" java.lang.UnsupportedClassVersionError:

Question

I am using JDK 14 on Netbeans on Windows 10. Everything works fine in the IDE environment. However, when I try to compile and run a source file from the command prompt, I get the java.lang.UnsupportedClassVersionError.

JAVA_HOME=c:\java\jdk14

The PATH and CLASSPATH in the system variables contain JAVA_HOME\bin, JAVA_HOME\lib.

If I issue java -version from the command prompt, in the JAVA_HOME directory, I get the following:

java version "1.8.0_251"
Java(TM) SE Runtime Environment (build 1.8.0_251-b08)
Java HotSpot(TM) Client VM (build 25.251-b08, mixed mode)

If I issue java -version from the JAVA_HOME\bin directory I get a different message listed below:

java version "14.0.1" 2020-04-14
Java(TM) SE Runtime Environment (build 14.0.1+7)
Java HotSpot(TM) 64-Bit Server VM (build 14.0.1+7, mixed mode, sharing)

I am not sure why? Please offer any advice. Thanks

Christian Frommeyer · Accepted Answer · 2020-06-06 10:49:36Z

1

Sounds like you have the path to a java binary of version 8 in the PATH as well and before the JAVA_HOME entries. You should be able to find out which java is used with the where command like where java. Or just put the JAVA_HOME entries at the very beginning of the PATH variable.

answered Jun 6, 2020 at 10:49

Christian Frommeyer

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Krishna Sony · Accepted Answer · 2020-06-06 20:18:18Z

0

The thing that determines which version of Java is being run is which java.exe file is being run, which from the command line is solely determined by the %PATH% variable.

JAVA_HOME and JDK_HOME are typically used by wrappers that need to find the Java command on disk. If you point directly to the java.exe file, they are not needed. I would suggest prepending C:\java\jdk14 to your PATH environment variable.

edited Jun 6, 2020 at 20:18

Krishna Sony

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answered Jun 6, 2020 at 10:46

Thorbjørn Ravn Andersen

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2 Comments

Anthony Over a year ago

Thank you. It appeared that an older version of java.exe was installed at part of the Windows OS and reflected in the PATH system variable before the JAVA_HOME\bin

Thorbjørn Ravn Andersen Over a year ago

You probably have installed it in a browser way back.

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