$lib = (Get-Item .\lib_desa).Name

$libNames = (Get-ChildItem $lib\*.jar).Name

$JDK7 = "C:\jdk1.7.0_65"

$bcp = "$JDK7\jre\lib\rt.jar"
foreach ($libName in $libNames)
{
    $cp += ";$lib\$libName"
}

Remove-Item classes\* -Recurse -Force

$Env:Path = "$JDK7\bin"

javac -J-Xmx1024m -bootclasspath $bcp -sourcepath src -classpath $cp src\Application.java -d classes