pack200 applet

[appel]

Trying to understand the relation between the applet tag and the game jar in pack200 games.

Here's a game that was submitted:

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<APPLET CODE="G.class" width="480" HEIGHT="480"> <PARAM NAME="cache_archive" VALUE="drts-4k.jar" /> <PARAM NAME="java_arguments" VALUE="-Djnlp.packEnabled=true" /> </APPLET>

The file that was uploaded for this game is named "drts-4k.jar.pack.gz". How does the applet know how to retrieve that file? Does it automagically read the cache_archive value, append ".pack.gz", and look that up from the webserver, ungzip it, and unpack it, and vola it has its jar!?

What happens if the param is:

1	<PARAM NAME="cache_archive" VALUE="applet.php?gid=999" />

? All go into a mess?

[Bonbon-Chan]

From this link, as I understand it :
- the client will allways ask for the "*.jar"
- it is up to the server to give the "*.jar.pack.gz" if the client support it (Accept-Encoding in the HTTP request). Other wise, it have to send the ".jar"
- the client know if it got "*.jar" or "*.jar.pack.gz" from the CE (Content-Encoding I think)

So I think it is OK to use a php page to send back the "*.jar" or "*.jar.pack.gz"

[Markus_Persson]

I think you can make the applet tag point directly at a .pack.gz as well.

And isn't it just ".pack.gz", not ".jar.pack.gz"? I mean, there's no jar in there.

Games published by our own members! Check 'em out!

[kappa]

java 1.6 can use pack200.gz files directly without server involvement using the code shown in appel's first post.

since plugin1 does not have the ability to use <PARAM NAME="java_arguments" VALUE="-Djnlp.packEnabled=true" /> the server will have to send a pack200 encoding to get it to run on plugin1 and java 1.5

[Bonbon-Chan]

And isn't it just ".pack.gz", not ".jar.pack.gz"? I mean, there's no jar in there.

I just copy what is in the link 

I think you can make the applet tag point directly at a .pack.gz as well

If the apple tag point directly on the .pack.gz, you have to be sure that all explorer that will be use can understant it... I have no idea whish ones are compatible with it. You should make a try and ask us to do the test.

[kappa]

well it would have made much more sense to be able to use it directly, but as we found out yesterday when testing it, it doesn't.

thx Sun.

[kappa]

I think you can make the applet tag point directly at a .pack.gz as well.

seems like only lwjgl applets allow that atm 

[Markus_Persson]

Damnit, sun.
When I tried a local .html file that pointed at a "M.pack.gz", a pack200 gz file, it worked. When I uploaded both to my webserver, it no longer worked, despite the file being there.

I can kind of understand why they'd want to enforce backwards compatibility on the server side so it'll still provide jars for older jvms.. but this is really, REALLY overly complicated. And it's not like code written for 1.5 will run on 1.4 jvms anyway if you use new classes or functions.

* Markus_Persson strangles sun

[pjt33]

Damnit, sun.
When I tried a local .html file that pointed at a "M.pack.gz", a pack200 gz file, it worked. When I uploaded both to my webserver, it no longer worked, despite the file being there.

Is your server providing an accurate Content-Type header? It may be that for local files the browser infers it but for http-provided files it assumes that the server knows what it's talking about.

[Riven]

The fact that the Java plugin cannot infer (override) some default Content-Type header is bad enough, especially as it got the full file extension in the URL.

Games published by our own members! Check 'em out!

[pjt33]

The fact that the Java plugin cannot infer (override) some default Content-Type header is bad enough, especially as it got the full file extension in the URL.

Sure, but I was interested more in suggesting workarounds than ranting.

[appel]

Alright, it's working. I was just missing the "Content-Encoding: pack200-gzip" header.

[michael bliem]

'dont reach the square' doesnt work for me (Applet G notloaded)

machine:
Apple Powerbook G4
OSX 10.4.11 (fully updated)
Java 1.5.0_19 (fully updated)

[appel]

'dont reach the square' doesnt work for me (Applet G notloaded)

machine:
Apple Powerbook G4
OSX 10.4.11 (fully updated)
Java 1.5.0_19 (fully updated)

Strange, seems to work for me, WinXP:

Java Plug-in 1.6.0_15
Using JRE version 1.5.0_14-b03 Java HotSpot(TM) Client VM

Or do I need Java Plug-in 1.5.x despite having JRE 1.5.x?

[michael bliem]

is there a java-plugin for mac?
testing my version of java for applets gives me java 1.5.0_19
there is no java 1.6 for my machine, but maybe a plugin?

java applets compiled 1.6 will not work on any apple powerpc
nor will they work for most leopard systems
only snow-leopard can handle 1.6 applets

compiling with javac option -source 1.5 would help,
but dont know if pack200 will work with 1.5?

[appel]

Hm... I have JDK 1.5.14 installed, how can I run the Applets with the 1.5.x browser plug-in? It seems to be gone from Firefox's Plugins list. I need to download and reinstall the 1.5 jdk?

[michael bliem]

Hm... I have JDK 1.5.14 installed, how can I run the Applets with the 1.5.x browser plug-in? It seems to be gone from Firefox's Plugins list. I need to download and reinstall the 1.5 jdk?

maybe with appletviewer of jdk1.5?

[Markus_Persson]

compiling with javac option -source 1.5 would help,
but dont know if pack200 will work with 1.5?

-target 1.5, however, will help.

[Alan_W]

I've written a new obfustificate / pack / zip chain which is getting the same sort of file size that Riven presented earlier.  However I can't get the browser (using file open on the html file) to get the pack.gz in preference to the .jar using the jre1.6 only parameter tag. (I am using 1.6).  If I remove the jar and just leave the pack.gz I get a nice class not found stacktrace. Can this be tested without recourse to a webserver?

My web hosting has .htaccess and php but no servlets.  I need to check whether they're using Apache, as I've seen some examples on how to get the right files served up using that.  Alternatively I'll need to hack out some PHP.  Anyone got a non-servlet solution working yet?

[pjt33]

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<APPLET CODE="G.class" width="480" HEIGHT="480"> <PARAM NAME="cache_archive" VALUE="drts-4k.jar" /> <PARAM NAME="java_arguments" VALUE="-Djnlp.packEnabled=true" /> </APPLET>

Does this work for anyone locally? I'm finding that if I have

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<applet width="640" height="480" code="a.class"> <param name="cache_archive" value="grav4k_1v3.jar" /> </applet>

it loads from the jar fine, but if I have

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<applet width="640" height="480" code="a.class"> <param name="cache_archive" value="grav4k_1v3.jar" /> <param name="java_arguments" value="-Djnlp.packEnabled=true" /> </applet>

I get error messages

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java.lang.ClassNotFoundException: a.class    at sun.plugin2.applet.Applet2ClassLoader.findClass(Applet2ClassLoader.java:152)    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)    at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Plugin2ClassLoader.java:445)    at sun.plugin2.applet.Plugin2Manager.createApplet(Plugin2Manager.java:2880)    at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Plugin2Manager.java:1397)    at java.lang.Thread.run(Thread.java:619) Caused by: java.io.FileNotFoundException: /tmp/pack200/a/class.class (No such file or directory)    at java.io.FileInputStream.open(Native Method)    at java.io.FileInputStream.<init>(FileInputStream.java:106)    at java.io.FileInputStream.<init>(FileInputStream.java:66)    at sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:70)    at sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:161)    at sun.plugin2.applet.Applet2ClassLoader.getBytes(Applet2ClassLoader.java:469)    at sun.plugin2.applet.Applet2ClassLoader.access$000(Applet2ClassLoader.java:46)    at sun.plugin2.applet.Applet2ClassLoader$1.run(Applet2ClassLoader.java:126)    at java.security.AccessController.doPrivileged(Native Method)    at sun.plugin2.applet.Applet2ClassLoader.findClass(Applet2ClassLoader.java:123)    ... 6 more

I am boggled at -Djnlp.packEnabled=true causing it to interpret the <applet>'s code attribute as a fully qualified name rather than the name of a class file. Replacing it with code="a" doesn't help: it looks for a file /tmp/pack200/a.class and ignores /tmp/pack200/grav4k_1v3.pack.gz


(Java 1.6.0_15 64-bit on Linux; errors obtained equally via plugin in Firefox and via appletviewer).

[Alan_W]

That's pretty much what I'm getting.  If I leave the jar in the same directory, then the browser goes and gets that Ok.  On the positive note, my hosting provider is using Apache, so hopefully I can fix up a server solution using .htaccess.  However I think that's a project for the weekend.

[moogie]

I have not been successful to use pack200 locally...

I have thought, but not investigated, about directly using game.pack.gz as instead of the game.jar in the applet tag, but append appropriate html response (with pack 200 mime type) message to the front of game.pack.gz to try and trick the JVM in to thinking it recieved a pack 200 archive from a server.

[kappa]

@pjt33

can you try <param name="cache_archive" value="grav4k_1v3" /> instead? (without the .jar bit)

[appel]

I have not been successful to use pack200 locally...

I have thought, but not investigated, about directly using game.pack.gz as instead of the game.jar in the applet tag, but append appropriate html response (with pack 200 mime type) message to the front of game.pack.gz to try and trick the JVM in to thinking it recieved a pack 200 archive from a server.

Perhaps it requires a server sending a "Content-Encoding: pack200-gzip" header.


Grr.. .I've been trying to accomplish this same thing, run an pack200 applet using the appletviewer, locally, but no luck. Why oh why does Sun need to make technologies such a pain to use client-side?

[pjt33]

@pjt33

can you try <param name="cache_archive" value="grav4k_1v3" /> instead? (without the .jar bit)

Same error.

[pjt33]

I won't claim it's pretty, but I don't think there are enough security flaws in this for anyone to do anything nasty to your machine. Tested and it allowed me to play the .pack.gz of Gravitational Fourks; the logging output is good enough to check that it is getting the file you think it is. I haven't played around with caching pragmas, because I want to get on with actually developing a game for this year, but I suspect they would be helpful.

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import java.io.*; import java.net.*; import java.util.*; /**  * A hacky HTTP daemon. Not designed for heavyweight usage; incorporates basic  * security, but nothing fancy; does support .pack.gz (so useful for Java4k  * testing).  * @author pjt33  */ public class HTTPD implements Runnable {    private static File rootDir;    private final Socket sock;    private String request;    private Object resource;    private int responseCode;    private Map<String, String> requestHeaders = new HashMap<String, String>();    private Map<String, String> responseHeaders = new HashMap<String, String>();    private HTTPD(Socket sock)    {       this.sock = sock;    }    public static void main(String[] args) throws IOException    {       // Process arguments.      if (args.length < 1 || args.length > 2) usage();       rootDir = new File(args[0]);       if (!rootDir.isDirectory()) usage();       int port = 8080;       if (args.length == 2)       {          try          {             port = Integer.parseInt(args[1]);          }          catch (NumberFormatException nfe)          {             usage();          }       }       // Ready to go.      ServerSocket serverSock = new ServerSocket(port);       while (true)       {          Socket sock = serverSock.accept();          // Paranoid security check since this is for local testing.         if (!sock.getInetAddress().isLoopbackAddress())          {             System.out.println("Denying request from non-local IP "+sock.getInetAddress());             sock.close();             continue;          }          new Thread(new HTTPD(sock)).start();       }    }    private static void usage()    {       System.err.println("Usage: java HTTPD <root-dir> [port]");       System.err.println("Default port is 8080");       System.exit(-1);    }    public void run()    {       try       {          final String utf8 = "UTF-8";          BufferedOutputStream outbin = new BufferedOutputStream(sock.getOutputStream());          PrintWriter out = new PrintWriter(new OutputStreamWriter(outbin, utf8));          BufferedReader in = new BufferedReader(new InputStreamReader(sock.getInputStream(), utf8));          InetAddress addr = sock.getInetAddress();          String line;          while ((line = in.readLine()) != null)          {             // First line            if (request == null)             {                // Line should be of the format               // METHOD resource HTTP/1.x               String[] bits = line.split(" ");                if (bits.length == 3)                {                   if ("GET".equals(bits[0]))                   {                      request = bits[1];                   }                   else                   {                      // We don't support POST, HEAD, etc.                     responseCode = 501;                      resource = "Not supported";                   }                }                else                {                   responseCode = 400;                   resource = "Bad request";                   break;                }             }             // Blank line indicates end of headers            else if (line.length() == 0)             {                break;             }             else             {                // Parse header.               String[] bits = line.split(":");                if (bits.length == 2)                {                   requestHeaders.put(bits[0].trim().toLowerCase(), bits[1].trim().toLowerCase());                }                // else ignore            }          }          // If we have a valid request, handle it.         if (responseCode == 0)          {             handleRequest();          }          // Some handling is the same-ish for success or failure.         int responseSize = 0;          if (responseCode == 0 || resource == null)          {             responseCode = 501;             resource = "Internal error";          }          if (resource instanceof String)          {             resource = resource.toString().getBytes(utf8);             responseHeaders.put("Content-Encoding", utf8);             responseHeaders.put("Content-Type", "text/plain; charset=UTF-8");          }          if (resource instanceof byte[]) responseSize = ((byte[])resource).length;          else if (resource instanceof File) responseSize = (int)((File)resource).length();          responseHeaders.put("Content-Length", Integer.toString(responseSize));          // Reply.         out.println("HTTP/1.1 "+responseCode);          for (Map.Entry<String, String> e : responseHeaders.entrySet())          {             out.println(e.getKey()+": "+e.getValue());          }          out.println();          // Ensure that we can write bytes to the binary stream ok.         out.flush();          if (resource instanceof byte[])          {             outbin.write((byte[])resource);          }          else if (resource instanceof File)          {             FileInputStream fis = new FileInputStream((File)resource);             byte[] buf = new byte[4096];             int len;             while ((len = fis.read(buf)) != -1)             {                outbin.write(buf, 0, len);             }             fis.close();          }          // Minimal logging         System.out.println("["+addr+"] "+responseCode+" ("+responseSize+" bytes) for "+request);          outbin.close();          in.close();       }       catch (IOException ioe)       {          ioe.printStackTrace();       }    }    private void handleRequest()    {       // The request was correctly formatted. Decode it, perform security      // checks, find the corresponding resource, and set up suitable response      // headers.      try       {          request = URLDecoder.decode(request, "UTF-8");       }       catch (UnsupportedEncodingException ufe)       {          // Failure to support UTF-8 is a problem with the Java environment.         InternalError err = new InternalError();          err.initCause(ufe);          throw err;       }       // Super-paranoid check for attempts to access files outside the      // permitted root directory.      if (request.indexOf("..") >= 0)       {          responseCode = 401;          resource = "Unauthorized";          return;       }       // Basic processing.      if (!request.startsWith("/"))       {          request = "/" + request;       }       File file = new File(rootDir, request);       if (!file.isFile())       {          responseCode = 404;          resource = "Not found";       }       else       {          responseCode = 200;          resource = file;          String contentType = getContentType(request);          if (contentType != null)          {             responseHeaders.put("Content-Type", contentType);          }          else          {             responseHeaders.put("Content-Type", "application/x-unknown");          }       }       // Extra hack for .pack.gz      if (request.endsWith(".jar") &&          requestHeaders.get("accept-encoding") != null &&          requestHeaders.get("accept-encoding").contains("pack200-gzip"))       {          // We check for two possibilities.         File _jar_pack_gz = new File(rootDir, request+".pack.gz");          File _pack_gz = new File(rootDir, request.replace("jar$", "pack.gz"));          if (_jar_pack_gz.isFile() || _pack_gz.isFile())          {             responseCode = 200;             resource = _jar_pack_gz.isFile() ? _jar_pack_gz : _pack_gz;             responseHeaders.put("Content-Type", "application/x-java-archive");             responseHeaders.put("Content-Encoding", "pack200-gzip");          }       }    }    private String getContentType(String request)    {       // Note: we're not doing magic on the file or anything fancy      if (request.endsWith(".html")) return "text/html";       if (request.endsWith(".jar")) return "application/x-java-archive";       return null;    } }

[Alan_W]

I got pack200 working under Tomcat6
1. Install Tomcat
2. If using Vista and Tomcat installed under Program Files, change permissions to allow modify & write
3. Edit startup.bat in /bin to include "set JRE_HOME=C:\Program Files\Java\jre6" or whereever you have a JRE installed
4. Check tomcat works when you run startup.bat, and stops with shutdown.bat
5. Add directory 'java' under directory 'webapps'.
6. Create subdirectory 'WEB-INF' and copy in 'web.xml' from 'webapps/ROOT/WEB-INF'
7. Edit web.xml to include:

  <!-- The JNLP servlet, installed to support Pack200 for use in Java4K     -->
    <servlet>
        <servlet-name>JnlpDownloadServlet</servlet-name>
        <servlet-class>jnlp.sample.servlet.JnlpDownloadServlet</servlet-class>
    </servlet>

    <!-- The mapping for the JNLP servlet for Java4k -->


    <servlet-mapping>
        <servlet-name>JnlpDownloadServlet</servlet-name>
        <url-pattern>*.jar</url-pattern>
    </servlet-mapping>

8. Create directory 'lib' under 'WEB-INF'
9. Copy in 'jnlp-servlet.jar', which you will find in the sample/jnlp/servlet direvtory in the java sdk
10. Add your .html and pack.gz files in the java directory.  Note you also need the jar as the server looks for it - but it can be an empty file
11. Point your browser at http://localhost:8080/java/yourhtmlfile.html

[Ranger]

Sorry, just confirming, it is not possible to test a pack200 file locally?  We have to do it via the tomcat method?  Are people actually doing that, or just hoping it works ok as a pack200 file and uploading to the Java4K site blindly?

[pjt33]

Sorry, just confirming, it is not possible to test a pack200 file locally?  We have to do it via the tomcat method?  Are people actually doing that, or just hoping it works ok as a pack200 file and uploading to the Java4K site blindly?

Look two posts before yours and you'll find a small self-contained web server which supports pack200.

(I had posted it before, but I didn't look in this thread. Oh well, never mind).

[Ranger]

Look two posts before yours and you'll find a small self-contained web server which supports pack200.

(I had posted it before, but I didn't look in this thread. Oh well, never mind).

Hi pjt33.  I can't seem to get it working.  I start it up: java HTTPD myDir

I have my html file with:

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<applet CODE="A.class" ARCHIVE="MyApplet.pack.gz" WIDTH="1000" HEIGHT="500"> <param name="java_arguments" value="-Djnlp.packEnabled=true" /> </applet>

The web server reads the html file ok, but Java gives this error:

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load: class A.class not found. java.lang.ClassNotFoundException: A.class    at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)    at java.lang.ClassLoader.loadClass(Unknown Source)    at java.lang.ClassLoader.loadClass(Unknown Source)    at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)    at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)    at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)    at java.lang.Thread.run(Unknown Source) Caused by: java.io.IOException: open HTTP connection failed:http://localhost:8080/A/class.class   at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)    at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)    at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)    at java.security.AccessController.doPrivileged(Native Method)    ... 7 more Exception: java.lang.ClassNotFoundException: A.class

I'm running java 1.6.0_13.

The web server outputs this:

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[/0:0:0:0:0:0:0:1] 200 (833 bytes) for /indexPack200.html [/127.0.0.1] 404 (9 bytes) for /A.class [/127.0.0.1] 404 (9 bytes) for /A/class.class

Any idea what I am doing wrong?

Thanks!

EDIT:  Changed ARCHIVE="MyApplet.pack.gz" to ARCHIVE="MyApplet" and woohoo!  It's working!  Thanks for the server code pjt33!