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Editorial Team
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Asked: 2026-05-30T17:30:29+00:00

Is there any way to load a jar file BEFORE a system jar? I

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Is there any way to load a jar file BEFORE a system jar? I have a class that is newer than the one in the java system (1.5) that I am forced to use, but it breaks because java loads it’s own first (from rt.jar, to be specific). Is there some way I can force it to load my own jar BEFORE system/rt.jar?

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  1. Editorial Team

    What you want is the (JVM specific) startup option -Xbootclasspath:/p. This will prepend the supplied list of paths and archives before the existing boot classpath, forcing any classes found to be loaded first. 

    java -Xbootclasspath/p:<pathtooverridejarhere> mypackage.MyClass

    Note that:

    • It is against Oracles TOS to distribute modified JDK classes
    • Loading a newer version of a JDK class may still fail, due to
      dependency resolution issues.
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