The program `logviewer` doesn't work natively. ``` $ logviewer Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/Logger at fr.esrf.logviewer.Main.<clinit>(Main.java:45) Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Logger at java.net.URLClassLoader.findClass(URLClassLoader.java:382) at java.lang.ClassLoader.loadClass(ClassLoader.java:418) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352) at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ``` Indeed `log4j` is no longer in /usr/local/share/java/ which contains the Java classes for Tango. The easiest way I found for now is to install `log4j` (via official Debian packages) and then create a link in /usr/local/share/java/ directory. ``` $ sudo ln -s /usr/share/java/log4j-1.2.jar /usr/local/share/java/log4j.jar ```