Thanks, Kendall.
I did try Xvfb yesterday. I found a version of Xvfb that seems to
work well on SPARC Solaris, from
http://puck.informatik.med.uni-giessen.de/download/GISWxwplt-sparc.tar.gz.
However, when I try to use JPEGImageEncoder.encode(), I get
java.lang.NoClassDefFoundError (which class?) or
java.lang.RuntimeException: Unable to process image stream, incorrect
format.
I do not get these errors when running under a real X server. Any ideas?
The two different stack traces follow. Joe
>>>>>>>> NoClassDefFoundError <<<<<<<<
java.lang.reflect.InvocationTargetException: java.lang.NoClassDefFoundError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:120)
at
java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment
.java:58)
at
java.awt.image.BufferedImage.createGraphics(BufferedImage.java:1011)
at
com.sun.media.jai.codecimpl.JPEGImage.<init>(JPEGImageDecoder.java:95)
at
com.sun.media.jai.codecimpl.JPEGImageDecoder.decodeAsRenderedImage(JPEGImage
Decoder.java:49)
at
com.sun.media.jai.opimage.CodecRIFUtil.create(CodecRIFUtil.java:67)
at com.sun.media.jai.opimage.JPEGRIF.create(JPEGRIF.java:52)
at java.lang.reflect.Method.invoke(Native Method)
at javax.media.jai.FactoryCache.invoke(FactoryCache.java:128)
at
javax.media.jai.OperationRegistry.invokeFactory(OperationRegistry.java:1651)
at
javax.media.jai.ThreadSafeOperationRegistry.invokeFactory(ThreadSafeOperatio
nRegistry.java:479)
at javax.media.jai.registry.RIFRegistry.create(RIFRegistry.java:338)
at com.sun.media.jai.opimage.StreamRIF.create(StreamRIF.java:103)
at java.lang.reflect.Method.invoke(Native Method)
at javax.media.jai.FactoryCache.invoke(FactoryCache.java:128)
at
javax.media.jai.OperationRegistry.invokeFactory(OperationRegistry.java:1651)
at
javax.media.jai.ThreadSafeOperationRegistry.invokeFactory(ThreadSafeOperatio
nRegistry.java:479)
at javax.media.jai.registry.RIFRegistry.create(RIFRegistry.java:338)
at javax.media.jai.RenderedOp.createInstance(RenderedOp.java:779)
at javax.media.jai.RenderedOp.createRendering(RenderedOp.java:825)
at javax.media.jai.RenderedOp.getSampleModel(RenderedOp.java:2052)
at
com.sun.media.jai.codecimpl.JPEGImageEncoder.encode(JPEGImageEncoder.java:13
7)
>>>>>>>> Unable to process image stream<<<<<<<<
java.lang.reflect.InvocationTargetException: java.lang.RuntimeException:
Unable to process image stream, incorrect format.
at
com.sun.media.jai.codecimpl.JPEGImage.<init>(JPEGImageDecoder.java:69)
at
com.sun.media.jai.codecimpl.JPEGImageDecoder.decodeAsRenderedImage(JPEGImage
Decoder.java:49)
at
com.sun.media.jai.codec.ImageDecoderImpl.decodeAsRenderedImage(ImageDecoderI
mpl.java:148)
at com.sun.media.jai.opimage.StreamRIF.create(StreamRIF.java:118)
at java.lang.reflect.Method.invoke(Native Method)
at javax.media.jai.FactoryCache.invoke(FactoryCache.java:128)
at
javax.media.jai.OperationRegistry.invokeFactory(OperationRegistry.java:1651)
at
javax.media.jai.ThreadSafeOperationRegistry.invokeFactory(ThreadSafeOperatio
nRegistry.java:479)
at javax.media.jai.registry.RIFRegistry.create(RIFRegistry.java:338)
at javax.media.jai.RenderedOp.createInstance(RenderedOp.java:779)
at javax.media.jai.RenderedOp.createRendering(RenderedOp.java:825)
at javax.media.jai.RenderedOp.getSampleModel(RenderedOp.java:2052)
at
com.sun.media.jai.codecimpl.JPEGImageEncoder.encode(JPEGImageEncoder.java:13
7)
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, January 31, 2001 9:19 AM
> To: Joe Latone; [EMAIL PROTECTED]
> Subject: RE: [JAVA2D] X server dependency and consequences of using a
> remo te X server
>
> I'm not absolutely sure if you'd suffer a performance penalty by using a
> remote X-server, but would think that would be the case... After all,
> the
> whole reason you need a frame buffer at all is that some of the graphics
> calls use native libraries to do the work.
>
> What you can do is use a program called XVFB to create a "Virtual Frame
> Buffer". The best article I've seen about it (along with links for
> obtaining XVFB) is at:
>
> http://www.sunworld.com/sunworldonline/swol-03-2000/swol-03-xvfb.html
>
> I've used a server side Java app that did some image manipulation
> (though
> not with JAI or Java2D) and it worked well for me. It's also nice
> because
> you can completely control the characteristics of the frame buffer you
> set
> up - 32 bit color, screen resolution, etc.
>
> ---> Kendall Gelner ([EMAIL PROTECTED])
>
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