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Editorial Team
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Asked: 2026-05-12T18:54:47+00:00

I have a jar file named umar.jar in /root/umar/bin directory. I have a shell

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I have a jar file named umar.jar in /root/umar/bin directory. I have a shell script file run.sh in same directory. Following is the content of run.sh

#!/bin/bash
"$JAVA_HOME"/bin/java -jar /root/umar/bin/umar.jar

Now when I run the shell script, I get the following error

Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file

After some googling, I found (as a folk from stackoverflow mentioned) that such errors occur when the Jar was compiled with a later version of the JDK than your JRE.

Now strange thing is, if I run this command directly on shell

java -jar umar.jar

it works perfectly fine. If the jar was compiled with a later version of JDK than my JRE, it shouldn’t have had run at all even from the shell.

What do you suggest?

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1 Answer

  1. Editorial Team

    compare “java -version ” and “”$JAVA_HOME”/bin/java -version”

    You probably have multiple JVMs installed

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