jad “Version mismatch: major.minor = 49.0, expected = 45.3”, what's version of .class file?

问题

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?

回答1:

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).

来源：https://stackoverflow.com/questions/11361955/jad-version-mismatch-major-minor-49-0-expected-45-3-whats-version-of