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Editorial Team
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Editorial Team
Asked: June 7, 20262026-06-07T05:41:32+00:00 2026-06-07T05:41:32+00:00

I used jad to decompile the class but in AIX system, such error thrown.

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I used jad to decompile the class but in AIX system, such error thrown.

Version mismatch: major.minor = 49.0, expected = 45.3

I don’t know what’s the version of .class file, how can I avoid this?

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  1. Editorial Team
    Editorial Team
    2026-06-07T05:41:33+00:00Added an answer on June 7, 2026 at 5:41 am

    The class was compiled for JDK5, your tools only support JDK1.1.

    You probably need a newer version of jad (or the whole JDK) on that machine (or compile your code for an older version of Java).

    major version number of the class file format being used:

    J2SE 7 = 51 (0x33 hex),
    J2SE 6.0 = 50 (0x32 hex),
    J2SE 5.0 = 49 (0x31 hex),
    JDK 1.4 = 48 (0x30 hex),
    JDK 1.3 = 47 (0x2F hex),
    JDK 1.2 = 46 (0x2E hex),
    JDK 1.1 = 45 (0x2D hex).
    
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