Hi,
I followed the instructions to run Java3D in netscape, it still doesn't work.:-( Any
suggestions ?
I got the information from the following sites.
http://tintoy.ncsa.uiuc.edu/~srp/java3d/faq.html
http://tintoy.ncsa.uiuc.edu/~srp/java3d/howto.html#netscape
Thanks !
-Wugang
Travis Bryson wrote:
> Hi Marvin, Mark,
>
> There are a couple of things to know about running Java standard extensions,
> like Java 3D, with Java Plug-in.
>
> > In the Java3D case I installed the four Java3D jars in
> > 'c:\Program Files\JavaSoft\Jre\1.2\lib\ext' - this should
> > make them accessible by the default classloader according to
> > the extensions mechanism.
>
> The most important thing to know is that there is a bug in the classloader
> of the current Windows Java Plug-in release, whereby the plug-in classloader
> looks for files in lib instead of lib\ext. So the solution is to copy (not move)
> the four Java 3D .jar files from lib\ext to lib in the Plug-in VM. You do not
> need to set your classpath, or anything like that. This is all in the Java
> 3D README (albeit a bit buried). This classloader bug is fixed in the next
> Java 2, Standard Edition release. This bug has also caused some folks trouble
> with the VRML release.
>
> The other thing to know, which I think you already know, but I will state
> for the benefit of the list, is that it takes special HTML to invoke the
> Java Plug-in from a browser. You can download something called the
> "Java Plug-in 1.2 HTML Converter", and this will convert your HTML files
> for you. It is very easy to use; you just give it the HTML file that
> works with appletviewer, and it spits out a new version that will work
> with Netscape, IE, or appletviewer. Be sure and use the 1.2 version.
>
> The Java Plug-in 1.2 HTML Converter, and the Java Plug-in 1.2, are available at:
> http://java.sun.com/products/plugin/index.html
>
> The reason you need to modify your HTML is because the Java Plug-in does
> not become the default VM for your browser. It is only invoked when the
> client clicks on the HTML file that you generated, which tells it to use
> the Plug-in VM instead of the default browser VM.
>
> I should mention that when you installed your Windows JDK, chances are you
> installed the Java Plug-in, also (it's bundled), although you are given an
> option at install time not to install it. If you are using Windows, you can
> see if it's there by checking to see if there is something at (or near, if you
> did a non-default target installation):
>
> c:\Program Files\JavaSoft\Jre\1.2
>
> BTW, your Java 3D applets do not necessarily have to be signed to run in a
> browser. They do need to be signed when you are doing things like file
> access using the java.io libraries or trying to perform a network access from
> your applet anywhere except back to the server from which the applet originated.
> I would suggest getting something simple like the HelloUniverse or SphereMotion
> Java 3D examples running in your browser first; neither of these need signing.
>
> The Java 3D installation itself is automatically trusted because it is
> pre-installed, as is true for any standard extension. So any basic Java 3D
> applet can run without digitally signing anything.
>
> Hope this helps.
>
> Travis Bryson
> Sun Microsystems
>
> ps: The Java Plug-in, version 1.2, for Solaris/Netscape is not yet available, but
> will be soon. It will use the production release of Java 2, Standard Edition.
>
> >Martin,
> >
> >I sent several questions/observations to the plug-in
> >group. If/when I get a useful response I'll post it.
> >Here is a rather long-winded summary of what I have
> >found. (sorry for the length)
> >
> >I have been able to run applets, but only by explicitly
> >adding the plug-in extensions jar-files to my CLASSPATH,
> >not a very elegant solution compared to the rather elegant
> >'extensions mechanism' of Jdk1.2. My impression is that
> >the extensions mechanism is not working. I hope I am wrong.
> >
> >I am running Windoze95, jdk1.2, Netscape4.05 and Java3D
> >1.1.1 for OpenGL. As you have found also, I have had no
> >trouble converting html-files to use the plug-in 1.2. I have had
> >problems getting the extension mechanism to work - in this
> >case, getting the default classloader to look for classes in the
> >'ext' directory of 'Jre/1.2' of the plug-in path. In the Java3D
> >case I installed the four Java3D jars in
> >'c:\Program Files\JavaSoft\Jre\1.2\lib\ext' - this should
> >make them accessible by the default classloader according to
> >the extensions mechanism.
> >I tried three settings for the plug-in control panel 'advanced'
> >features. One was 'default' and the other was
> >'C:\Program Files\JavaSoft\Jre\1.2', and the third was for the
> >jdk JRE directory. These all resulted in 'Class
> >Not Found' errors - thus, the default classloader does not seem
> >to know to look in the extensions directory.
> >
> >I found a few references to this question in the Java3D FAQ.
> >The main point made was changing the advanced panel in the
> >plug-in control panel. There was also a reference to needing to
> >sign jar files, but I don't think that should be needed given that
> >I have read that native code classes can be loaded if they are
> >placed in the 'ext' subdirectory of the JRE/lib of the plug-in.
> >In any case, as I mentioned, the panel changes didn't help me.
> >
> >I found this passage in the Plug-in FAQ, but I had no luck in
> >realizing it:
> >
> > Q: We are trying to use Java 3D with Java Plug-in, but it doesn't
> >work at all. Why?
> >
> > A: Java 3D comes with various packages. Installing it
> >incorrectly may inadvertently disable Java
> > Plug-in or cause it to fail. Follow these general
> >instructions for using Java 3D and Java Plug-in:
> >
> > 1.Install Java Plug-in first.
> > 2.Install Java 3D in a new directory. Do not
> >install it over the existing JDK/JRE.
> > 3.In the Java Plug-in control panel, switch the JRE
> >to the one that came with Java 3D.
> > 4.Download the HTML Converter 1.2 and convert the
> >Java 3D demo pages.
> >
> > The Java 3D demos should now run within Java Plug-in.
> >
> >
> >
> >As I said, I did this, but only got applets running by an explicit
> >addition of the extensions directory jar-files to my CLASSPATH,
> >thus, not using the elegant solution of the plug-in extensions mechanism.
> >
> >I would also be interested in knowing if anyone has been successful
> >in using *only* the presence of the J3D jar files in the plug-in extensions
> >directory to run J3D applets. (ie. no explicit addition to the CLASSPATH)
> >
> >Best wishes,
> >
> >Mark
> >
> >---------------------------------------------
> >Marvin Chase wrote:
> >
> >> I'm using Java 2 with Java3D1.1, The Java Plug-in and The Java HTML
> >> Converter. My Java 2 JRE is installed to E:\Program Files\JavaSoft... I
> >> wrote a 3D app that I want to run in a browser. I converted the html
> >> display page with the Converter, but I have no success running the app.
> >> I've tried the Java Plug-in examples online and they work fine, but I cant
> >> get anything to run from my hard disk. The 2D demos that come with the kit
> >> don't display in my browser (IE5) either despite The Java Plug-in. I am
> >> only able to display them using appletviewer. Can anyone help? Thanks for
> >> any suggestions..
> >>
> >> ICQ: 8647690
> >>
> >> =====================================================================
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> >> Java 3D Home Page: http://java.sun.com/products/java-media/3D/
> >
> >
> >
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> >Java 3D Home Page: http://java.sun.com/products/java-media/3D/
>
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