# cd lib

# ls

test.jar dependency1.jar dependency2.jar

$ unzip -l test.jar

or

$ vim test.jar

$ mkdir test_dir

$ unzip test.jar -d test_dir

$ vi -b test_dir/package/Class.class

:%!xxd

0000000: cafe babe 0000 0032 0123 0700 0201 0023 .......2.#.....#

$ vi test_dir/package/Class.java

$ ls *.jar|sed ':a;N;$!ba;s/\n/:/g'

test.jar:dependency1.jar:dependency2.jar

$ javac -help

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 and annotation processors

  -cp <path>                 Specify where to find user class files and annotation processors

  -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

  -proc:{none,only}          Control whether annotation processing and/or compilation is done.

  -processor <class1>[,<class2>,<class3>...] Names of the annotation processors to run; bypasses default discovery process

  -processorpath <path>      Specify where to find annotation processors

  -parameters                Generate metadata for reflection on method parameters

  -d <directory>             Specify where to place generated class files

  -s <directory>             Specify where to place generated source files

  -h <directory>             Specify where to place generated native header files

  -implicit:{none,class}     Specify whether or not to generate class files for implicitly referenced 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

  -profile <profile>         Check that API used is available in the specified profile

  -version                   Version information

  -help                      Print a synopsis of standard options

  -Akey[=value]              Options to pass to annotation processors

  -X                         Print a synopsis of nonstandard options

  -J<flag>                   Pass <flag> directly to the runtime system

  -Werror                    Terminate compilation if warnings occur

  @<filename>                Read options and filenames from file

$ javac -cp test.jar:dependency1.jar:dependency2.jar -source 1.6 -target 1.6 -sourcepath test_dir -d test_dir test_dir/package/Class.java

$ cd test_dir

$ zip -r test.jar ./*

$ cd ..

$ cp test_dir/test.jar test.jar

$ /bin/rm -rf test_dir