Hi all
I follow this install guide :  
http://wiki.open-xchange.com/wiki/index.php? 
title=Open_Xchange_Installation
My OS is Debian GNU/Linux 4.0
# java -version response is ok but # javac -version response is :
javac 1.5.0_10
javac: no source files
Usage: javac <options> <source files>
where possible options include:
   -g                         Generate all debugging info
   -g:none                    Generate no debugging info
   -g:{lines,vars,source}     Generate only some debugging info
   -nowarn                    Generate no warnings
   -verbose                   Output messages about what the compiler is  
doing
   -deprecation               Output source locations where deprecated  
APIs are used
   -classpath <path>          Specify where to find user class files
   -cp <path>                 Specify where to find user class files
   -sourcepath <path>         Specify where to find input source files
   -bootclasspath <path>      Override location of bootstrap class files
   -extdirs <dirs>            Override location of installed extensions
   -endorseddirs <dirs>       Override location of endorsed standards  
path
   -d <directory>             Specify where to place generated class  
files
   -encoding <encoding>       Specify character encoding used by source  
files
   -source <release>          Provide source compatibility with  
specified release
   -target <release>          Generate class files for specific VM  
version
   -version                   Version information
   -help                      Print a synopsis of standard options
   -X                         Print a synopsis of nonstandard options
   -J<flag>                   Pass <flag> directly to the runtime system

Why ?

there is also a problem with "apt" :

debianOX:~# apt
Usage: apt <apt and javac options> <source files>
where apt options include:
   -classpath <path>          Specify where to find user class files and  
annotation processor factories
   -cp <path>                 Specify where to find user class files and  
annotation processor factories
   -d <path>                  Specify where to place processor and javac  
generated class files
   -s <path>                  Specify where to place processor generated  
source files
   -source <release>          Provide source compatibility with  
specified release
   -version                   Version information
   -help                      Print a synopsis of standard options; use  
javac -help for more options
   -X                         Print a synopsis of nonstandard options
   -J<flag>                   Pass <flag> directly to the runtime system
   -A[key[=value]]            Options to pass to annotation processors
   -nocompile                 Do not compile source files to class files
   -print                     Print out textual representation of  
specified types
   -factorypath <path>        Specify where to find annotation processor  
factories
   -factory <class>           Name of AnnotationProcessorFactory to use;  
bypasses default discovery process
See javac -help for information on javac options.

Can you help me ?
Thank You in advance