Madsonic Support

Posted: **15 May 2013, 15:54**

Hi,

Whenever I try to launch Madsonic (tried with Madsonic Server 5.0 Beta2 Build 3480 (JAVA6) and Build 3360), I get this error:

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Exception in thread "main" java.lang.UnsupportedClassVersionError: net/sourceforge/subsonic/booter/Main : Unsupported major.minor version 51.0

Which seems to be typical of trying to execute bytecode with a JVM that is older than the one that compiled it.

My guess is that Madsonic what compiled with Java7... Is that correct?

Since Server 5.0 Beta2 Build 3480 (JAVA6) seems to be targeted to Java6, would it be possible to compile it with a Java6 JDK ? (Or, if not, maybe it would be nice to change its name to Server 5.0 Beta2 Build 3480 (JAVA7))

Thanks.

Posted: **15 May 2013, 23:45**

Since 4.8 (maybe 4.7), Madsonic has used Java 7, as it's more secure and lacks the "holes" that Java 6 has.

There is a version of Madsonic 5.0 beta compiled with Java 6 - just check the download thread for one marked "JAVA6".

Posted: **16 May 2013, 20:16**

Thanks for the answer.

It's strange, because it is indeed the Java6 version I tried.

Posted: **16 May 2013, 20:31**

If I download the Java6 build (20130508_madsonic-5.0.3480.beta2SE-standalone.zip), extract subsonic-booter.jar, and use javap -v on a class file, I get:

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Classfile /home/user/SettingsPanel$1.class
...
  minor version: 0
  major version: 51
...

which are the version numbers for Java1.7.

Am I mistaken, or is it possible that there was some mixup when releasing the build ?

Posted: **16 May 2013, 22:00**

Hi there,

Thanks for spoting out !

false merged templates ... i will fix this with next Build.

best regards

btw

J2SE 8 = 52,
J2SE 7 = 51,
J2SE 6.0 = 50,
J2SE 5.0 = 49,
JDK 1.4 = 48,
JDK 1.3 = 47,
JDK 1.2 = 46,
JDK 1.1 = 45

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