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How to Determine the JDK Version Used to Compile a .class File?

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Release: 2024-12-16 07:12:15
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How to Determine the JDK Version Used to Compile a .class File?

How to Check the JDK Version Used to Compile a .class File

Checking the Version

When encountering the error, "Bad version number in .class file," it can be helpful to determine the version of the .class files in question. Here's a cross-platform approach to checking the major JDK version used to compile a .class file:

Unix/Linux

javap -verbose MyClass | grep "major"
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Windows

javap -verbose MyClass | findstr "major"
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Interpreting the Output

The output of the above command will include a line similar to:

major version: 50
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This value corresponds to the major JDK version used to compile the .class file. Refer to the table below for a mapping between major version numbers and Java versions:

Java Version Major Version
1.2 46
1.3 47
1.4 48
5 49
6 50
7 51
8 52
9 53
10 54
11 55
12 56
13 57
14 58
15 59
16 60
17 61
18 62
19 63
20 64
21 65
22 66

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