Hi Antoine and Ivan,

Just tried the following:

       <javac srcdir="${src}"  
               destdir="classes" >
              <compilerarg value="-Xlint=&quot;unchecked&quot;"/>
       </javac>

and this:

<javac deprecation="${deprecation}"                 
debug="${debug}" debuglevel="${debuglevel}">
    <compilerarg line="-Xlint=&quot;unchecked&quot;"/>
</javac>


But recieve the following error:

C:\Documents and Settings\Ed Taylor\My Documents\Builds\JManagerBuild>ant
Buildfile: build.xml

init:

compile:
    [javac] Compiling 30 source files to C:\Documents and Settings\Ed Taylor\My 
Documents\Builds\JManagerBuild\classes
    [javac] javac: invalid flag: -Xlint="unchecked"
    [javac] Usage: javac <options> <source files>
    [javac] where possible options include:
    [javac]   -g                         Generate all debugging info
    [javac]   -g:none                    Generate no debugging info
    [javac]   -g:{lines,vars,source}     Generate only some debugging info
    [javac]   -nowarn                    Generate no warnings
    [javac]   -verbose                   Output messages about what the 
compiler is doing
    [javac]   -deprecation               Output source locations where 
deprecated APIs are used
    [javac]   -classpath <path>          Specify where to find user class files
    [javac]   -cp <path>                 Specify where to find user class files
    [javac]   -sourcepath <path>         Specify where to find input source 
files
    [javac]   -bootclasspath <path>      Override location of bootstrap class 
files
    [javac]   -extdirs <dirs>            Override location of installed 
extensions
    [javac]   -endorseddirs <dirs>       Override location of endorsed 
standards path
    [javac]   -d <directory>             Specify where to place generated class 
files
    [javac]   -encoding <encoding>       Specify character encoding used by 
source files
    [javac]   -source <release>          Provide source compatibility with 
specified release
    [javac]   -target <release>          Generate class files for specific VM 
version
    [javac]   -version                   Version information
    [javac]   -help                      Print a synopsis of standard options
    [javac]   -X                         Print a synopsis of nonstandard options
    [javac]   -J<flag>                   Pass <flag> directly to the runtime 
system



I think something else is wrong beause if I execute (javac -version), I recive 
the following error also:

javac -version

javac 1.5.0
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



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