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Editorial Team
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Asked: 2026-06-01T15:11:35+00:00

I have a question regarding the compatibility between different java versions. On my computer,

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I have a question regarding the compatibility between different java versions.

On my computer, I have java version “1.7.0_02”.
But when I uploaded the .class and embedded it in a webpage it does not work

I get the error:

“Unsupported major.minor version 51.0”

the heading at the top of the console says:
“Java Plug-in 1.6.0_31
Using JRE version 1.6.0_31-b05 Java HotSpot(TM) Client VM”

I would like to ask what is causing the problem. Is it really my java version?
I mean, I visited the site with the computer I compiled the applet in.

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1 Answer

  1. Editorial Team

    You can’t use classes compiled to Java 1.7-compatibility class files with an earlier virtual machine, and that “Java Plug-in” error you’re seeing says that’s exactly what happen.

    Two options:

    1. if you’re not using Java 1.7 only features, you can compile your code to be compatible with 1.6 JVM’s using the option -target 1.6 (see docs here)
    2. Upgrade the Java plug-in your browser is using to 1.7, if possible (I don’t think you can do this on OS X, for example). You didn’t note what OS and browser you’re using so I’m not sure what the upgrade path would be, if any.
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