packages and JAR files

New to Java:

I'm trying to learn more about the packages and JAR libraries using jdk1.7.0_17 on Debian 6.0.7 (Squeeze). I created a tree of directories and files to work with:
2013-05-11 20:22:07 dpchrist@desktop ~/sandbox/java/jar
$ tree .
.
|-- Makefile
|-- bin
|   |-- using_class_files
|   |   `-- MyApp.class
|   `-- using_jar_file
|-- ext
|   `-- com
|       `-- example
|           `-- myapp
|               `-- util.jar
|-- obj
|   `-- com
|       `-- example
|           `-- myapp
|               `-- util
|                   `-- Speak.class
`-- src
    `-- com
        `-- example
            `-- myapp
                |-- MyApp.java
                `-- util
                    `-- Speak.java

17 directories, 6 files

2013-05-11 20:22:39 dpchrist@desktop ~/sandbox/java/jar
$ cat src/com/example/myapp/util/Speak.java 
package com.example.myapp.util;
public class Speak {
    public static void hello(String arg) {
     System.out.println("hello, " + arg);
    }
}

2013-05-11 20:23:27 dpchrist@desktop ~/sandbox/java/jar
$ cat src/com/example/myapp/MyApp.java 
import com.example.myapp.util.Speak;
public class MyApp {
    public static void main(String [] args) {
     Speak s = new Speak();
     s.hello("world!");
    }
}

2013-05-11 20:23:54 dpchrist@desktop ~/sandbox/java/jar
$ cat Makefile 
.PHONY: all
all: clean using_class_files using_jar_file

.PHONY: using_class_files
using_class_files:
     # create utility bytecode file (Speak.class)
     mkdir -p obj/com/example/myapp/util
     javac -d obj src/com/example/myapp/util/Speak.java

     # compile application file against Speak.class
     mkdir -p bin/using_class_files
     javac -d bin/using_class_files -cp obj src/com/example/myapp/MyApp.java

     # run application
     java -cp obj:bin/using_class_files MyApp

.PHONY: using_jar_file
using_jar_file:
     # put Speak.class into a Java archive (util.jar)
     mkdir -p ext/com/example/myapp
     jar cvf ext/com/example/myapp/util.jar -C obj/com/example/myapp/util Speak.class

     # print util.jar table of contents
     jar tf ext/com/example/myapp/util.jar

     # compile application against util.jar
     mkdir -p bin/using_jar_file
     javac -d bin/using_jar_file -extdirs ext src/com/example/myapp/MyApp.java

.PHONY: clean
clean:
     rm -rf bin ext obj
I use to make my orders are repeatable. the Makefile is 'quick and dirty '. Emphasis is placed on the keywords 'package' and 'import' of Java and command line tools and their options (javac, jar and java).

Compile the utility class (Speak.java), compile the application (MyApp.java) against the tree of bytecode (. / obj) and running the application against the tree quote bytecode:
2013-05-11 20:23:58 dpchrist@desktop ~/sandbox/java/jar
$ make clean
rm -rf bin ext obj

2013-05-11 20:24:01 dpchrist@desktop ~/sandbox/java/jar
$ make using_class_files
# create utility bytecode file (Speak.class)
mkdir -p obj/com/example/myapp/util
javac -d obj src/com/example/myapp/util/Speak.java
# compile application file against Speak.class
mkdir -p bin/using_class_files
javac -d bin/using_class_files -cp obj src/com/example/myapp/MyApp.java
# run application
java -cp obj:bin/using_class_files MyApp
hello, world!
Put the bytecode of the utility (Speak.class) file in a JAR file (util.jar) works, but compile the application against the tree in the POT (. / ext) fails:
2013-05-11 20:24:08 dpchrist@desktop ~/sandbox/java/jar
$ make using_jar_file
# put Speak.class into a Java archive (util.jar)
mkdir -p ext/com/example/myapp
jar cvf ext/com/example/myapp/util.jar -C obj/com/example/myapp/util Speak.class
added manifest
adding: Speak.class(in = 572) (out= 364)(deflated 36%)
# print util.jar table of contents
jar tf ext/com/example/myapp/util.jar
META-INF/
META-INF/MANIFEST.MF
Speak.class
# compile application against util.jar
mkdir -p bin/using_jar_file
javac -d bin/using_jar_file -extdirs ext src/com/example/myapp/MyApp.java
src/com/example/myapp/MyApp.java:1: error: package com.example.myapp.util does not exist
import com.example.myapp.util.Speak;
                             ^
src/com/example/myapp/MyApp.java:4: error: cannot find symbol
     Speak s = new Speak();
     ^
  symbol:   class Speak
  location: class MyApp
src/com/example/myapp/MyApp.java:4: error: cannot find symbol
     Speak s = new Speak();
                   ^
  symbol:   class Speak
  location: class MyApp
3 errors
make: *** [using_jar_file] Error 1
Any suggestions?

TIA,

David

Normally, you would run javac from the 'src' directory, so:

javac [options] com/mycompany/whatever/package/MyClass.java

It will then automatically find or compile all the other classes that are correctly under 'src' under their packages.

Tags: Java

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