Modules and packages and demos
Mark Reinhold
mr at sun.com
Fri May 29 13:06:37 PDT 2009
With my latest changesets we can now build an initial set of platform
modules, and corresponding Debian packages.
Here are the modules (output of jmod ls -v, with comments added):
jdk.boot at 7-ea
permits jdk.base, jdk.awt, jdk.swing, jdk
# The core of the platform, command-line only
jdk.base at 7-ea
requires local public jdk.boot@=7-ea
# An empty module for applications to require; they can't require
# jdk.boot directly since it only permits jdk{,.*} modules
jdk.awt at 7-ea
requires local public jdk.boot@=7-ea
permits jdk.swing
# The AWT (Bug: This module can't be required directly by apps;
# need to fix that, likely by introducing another jdk.base-like
# wrapper module.)
jdk.swing at 7-ea
requires local public jdk.boot@=7-ea
requires local public jdk.awt@=7-ea
jdk at 7-ea
requires local public jdk.boot@=7-ea
# Everything that didn't wind up in the above modules, though
# right now this will get you just the JRE, not the full JDK
# (i.e., no tools)
This initial modularization is (very!) crude; there are, e.g., some XML
and java.util.concurrent classes in the Swing module. It's good enough,
however, to demonstrate that the basic Jigsaw packaging, install, and
runtime components actually work.
Here are the corresponding Debian packages:
$ ls -l build/jigsaw-pkgs/
total 33107
-rw-r--r-- 1 mr green 6177270 May 29 10:04 jdk.awt_7_ea_all.deb
-rw-r--r-- 1 mr green 1206 May 29 10:04 jdk.base_7_ea_all.deb
-rw-r--r-- 1 mr green 4127386 May 29 10:10 jdk.boot_7_ea_i386.deb
-rw-r--r-- 1 mr green 2777180 May 29 10:04 jdk.swing_7_ea_all.deb
-rw-r--r-- 1 mr green 20774498 May 29 10:04 jdk_7_ea_all.deb
$
These aren't very well compressed at the moment; in particular, they
don't use pack200 for class files or lzma for binaries. The package
metadata is singularly uninformative, and also incorrect, e.g., the
packages should be labeled "i386" rather than "all". Dalibor is, as
I write this, furiously hacking jpkg to address these problems.
As to the demo, attached is the output of the current demo script, with
commentary. The demo will be smoother once I get the packages properly
published on a web server so that apt-get and synaptic just work.
My next task will be to merge Jon's latest javac changes, after which
I'll extend the demo script to show how to compile and package the
"Hello, world" program, and then install it and show that it creates
a /usr/bin/hello command to launch the program.
- Mark
-------------- next part --------------
$
$ # Do we have java here?
$
$ java -version
bash: java: command not found
$
$ # Oops, no, let's see what we can find.
$
$ ls -l pkgs/openjdk-6-*.deb
-rw-r--r-- 1 mr green 25692258 Apr 14 08:05 pkgs/openjdk-6-jre-headless_6b14_i386.deb
$
$ # Hmm, that's mighty big! What about this one?
$
$ ls -l pkgs/jdk.boot_7_ea_i386.deb
-rw-r--r-- 1 mr green 4127386 May 29 10:10 pkgs/jdk.boot_7_ea_i386.deb
$
$ # Ooh, nice and compact! Let's install it.
$
$ su dpkg -i pkgs/jdk.boot_7_ea_i386.deb
Selecting previously deselected package jdk.boot.
(Reading database ... 215229 files and directories currently installed.)
Unpacking jdk.boot (from pkgs/jdk.boot_7_ea_i386.deb) ...
Setting up jdk.boot (7_ea) ...
$ java -version
java version "1.7.0-mr_2009.05.29.1022"
Java(TM) SE Runtime Environment (build 1.7.0-mr_2009.05.29.1022-b00)
OpenJDK Server VM (build 15.0-b02, mixed mode)
$
$ # Okay, that worked. Let's run our standard test program.
$
$ cat src/org/hello/Main.java
package org.hello;
public class Main {
public static void main(String[] args) {
System.out.println("Hello, modular world!");
}
}
$ javac -d classes src/org/hello/Main.java
$ java -cp classes org.hello.Main
Hello, modular world!
$
$ # Okay, what about a simple Swing application?
$
$ cat src/org/hello/swing/Main.java
package org.hello.swing;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Main
extends JFrame
implements ActionListener
{
public Main() {
super("Hello");
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setLayout(new FlowLayout(FlowLayout.CENTER, 8, 4));
add(new JLabel("Hello, world!"));
JButton jb = new JButton("Good-bye");
jb.addActionListener(this);
jb.setToolTipText("Click this button to exit");
add(jb);
pack();
}
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
public static void main(String[] args) {
System.setProperty("swing.defaultlaf",
"com.sun.java.swing.plaf.gtk.GTKLookAndFeel");
new Main().setVisible(true);
}
}
$ javac -d classes src/org/hello/swing/Main.java
$ java -cp classes org.hello.swing.Main
Exception in thread "main" java.lang.NoClassDefFoundError: java/awt/event/ActionListener
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:642)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:336)
at java.net.URLClassLoader.access$000(URLClassLoader.java:75)
at java.net.URLClassLoader$1.run(URLClassLoader.java:271)
at java.net.URLClassLoader$1.run(URLClassLoader.java:265)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:264)
at java.lang.ClassLoader.loadClass(ClassLoader.java:325)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:270)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:209)
Caused by: java.lang.ClassNotFoundException: java.awt.event.ActionListener
at java.net.URLClassLoader$1.run(URLClassLoader.java:276)
at java.net.URLClassLoader$1.run(URLClassLoader.java:265)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:264)
at java.lang.ClassLoader.loadClass(ClassLoader.java:325)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:270)
... 13 more
$
$ # Oops, looks like we haven't installed Swing yet.
$
$ jmod ls
jdk.boot at 7-ea
$
$ # Yep, that's just the boot module. Let's install Swing.
$
$ su dpkg -i pkgs/jdk.awt_7_ea_all.deb pkgs/jdk.swing_7_ea_all.deb
Selecting previously deselected package jdk.awt.
(Reading database ... 219271 files and directories currently installed.)
Unpacking jdk.awt (from pkgs/jdk.awt_7_ea_all.deb) ...
Selecting previously deselected package jdk.swing.
Unpacking jdk.swing (from pkgs/jdk.swing_7_ea_all.deb) ...
Setting up jdk.awt (7_ea) ...
Setting up jdk.swing (7_ea) ...
$
$ # Which modules do we have installed now?
$
$ jmod ls
jdk.awt at 7-ea
jdk.boot at 7-ea
jdk.swing at 7-ea
$ java -cp classes org.hello.swing.Main
$
$ # Good! I saw a "Hello, world!" window on my screen,
$ # with a "Good-bye" button, as expected.
$
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