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Editorial Team
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Asked: 2026-06-16T20:39:05+00:00

I have some code that uses the proprietary sun.*.OperatingSystemMXBean, so I was being careful

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I have some code that uses the proprietary sun.*.OperatingSystemMXBean, so I was being careful with it.

try {
    _osBean = (com.sun.management.OperatingSystemMXBean) java.lang.management.ManagementFactory.getOperatingSystemMXBean();
}
catch (ClassCastException e) {
    _osBean = null;
}

However, when this code runs on an IBM JVM, instead of ClassCastException, I get a runtime ClassNotFoundException. Why is this code able to compile just fine if that class is not available and how does a JVM affect something like this?

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1 Answer

  1. Editorial Team

    the com.sun.* packages are private classes written by sun for the sun JVM (hotspot) and are not public API (even though your code proves they are accessible).
    the IBM JVM is a completely different implementation and doesnt have them (as they are not part of any java/jvm spec).
    im guessing it compiles fine since youre compiling with the sun/oracle JDK
    to try and resolve the issue, try casting to 

    java.lang.management.OperatingSystemMXBean

    instead (which is a public API) and see if that works for you

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