Question

I believe this is how I can compile and run a file that uses external library. I’m using Windows.

top level directory
|
|-log4-1.2.17.jar
|-MyApp.java
|-com
     |-foo
          |-Bar.java

Compiling

javac -cp log4j-1.2.17.jar;. com\foo\Bar.java
javac -cp log4j-1.2.17.jar;"com\foo";. MyApp.java

Executing

java -cp log4j-1.2.17.jar;"com\foo";. MyApp

Compiling itself failed.

Answer 1

simple batch script, for compiling all your project

set COMPILED_CLASSES=.\
set TEMP_FILE=temp
dir .\*.java /s /B > %TEMP_FILE%
javac -classpath log4j-1.2.17.jar;%COMPILED_CLASSES% -d %COMPILED_CLASSES% @%TEMP_FILE%
rm %TEMP_FILE%

add it to top level dir and run
EDIT
step by step

javac ./com/foo/Bar.java -classpath log4j-1.2.17.jar  

next

javac ./MyApp.java -classpath log4j-1.2.17.jar;./  

run

java -classpath log4j-1.2.17.jar;./ MyApp