Exception while compiling: wrong version 50.0, should be 49.0

java exception jxl
i2ijeya picture i2ijeya · Nov 19, 2009 · Viewed 88.9k times · Source

I am working an application with JXL API and when i tried compiling using eclipse IDE, it's working fine and the same is not compiling when i am trying to compile in Command prompt and showing the below exception..

Extract.java:6: cannot access jxl.read.biff.BiffException bad class file: C:\Program Files\Java\jdk1.5.0_01\jre\lib\ext\jxl.jar(jxl/read/biff/BiffException.class)
class file has wrong version 50.0, should be 49.0
Please remove or make sure it appears in the correct subdirectory of the classpa
th.
import jxl.read.biff.BiffException;
                     ^
1 error

EDIT:

I am able to executing using JDK 1.6. Since JDK 1.6 must also be compatible with lower versions, why doesn't it support the class files which were compiled in JDK 1.5.

Answer

OscarRyz picture OscarRyz · Nov 19, 2009

The library you're using was compiled with Java 6

Your compiler is Java 5 that's why it doesn't understand that format.

To fix it you have to get a 1.5 version of the library or upgrade your compiler to 1.6 I suggest the later.

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