Madsonic Support

Posted: **29 Oct 2014, 16:15**

I installed java 7 version 1.7.0_65 along jre-7-headless then installed madsonic 5.1.5200, however when it finishes and tries to start, or I try to manually start it, it doesn't start. My madsonic_sh.log shows this

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Exception in thread "main" java.lang.UnsupportedClassVersionError: org/madsonic/booter/Main : Unsupported major.minor version 51.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:643)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
Could not find the main class: org.madsonic.booter.Main. Program will exit.

Posted: **01 Nov 2014, 02:30**

Perhaps you missed a step in installation for Debian?
As the main exception really seems to be it could not find the Main class in the booter...which is really bad. Not the java version so much.

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Could not find the main class: org.madsonic.booter.Main. Program will exit.

However just to be sure you do have the correct jre/jvm setup what is the output of?

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java -version

How are you starting madsonic?

Posted: **18 Jan 2015, 03:29**

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#!/bin/bash
sudo apt-get install openjdk-7-jdk openjdk-7-jre
sudo update-alternatives --config java
# Set to 1.7
cd /opt && wget $url_to_latest_madsonic_version
sudo dpkg -i 20141017_madsonic-5.1.5200.deb

Posted: **18 Jan 2015, 10:09**

What i always forget is that Debian comes standaard with JAVA 6, so you have to switch to 7 manually using

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sudo update-alternatives --config java

Posted: **04 May 2015, 16:52**

TYI

i add some java installation notes to the documentation

http://beta.madsonic.org/pages/installation.jsp#java

Madsonic Support

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