[udig-devel] GeoTiffs, ImageIO, plug-ins, catastrophe

["Gary W. Lucas" <gwlucas@xxxxxxxxxxxxx>]

I apologize in advance for sending a post that is a bit off topic, but I
was referred here by folks on the GeoTools mailing list.  I have
been trying to implement an Eclipse plug-in that interfaces with the
GeoTools API to plot GeoTiff images and been fabulously unsuccessful due
to problems related to class loader issues and the Java Image IO (JAI)
classes. Literally, I've spent days on this...  since this issue is
something that uDig has overcome (as I understand it, GeoTools is the
basis for the uDig mapping), I was wondering if there was anyone here who
could offer me some advice on how to make it work.

I started with a Java/Swing application and everything went smoothly
(once I downloaded and installed the JAI extensions). But I have not been
able to get an Eclipse plug-in to work.  Typically, the errors I run
into are of the flavor shown in the the exception text shown at the
bottom of this email.  Following one suggestion, I have looked into
the use of buddy classloaders, but don't see how they relate to what
should be a system-level classloader issue.

Anyway, if anyone could offer me instructions on how to make this stuff
work or point me in the direction of a web resource that offers a good
explanation, I would be truly grateful.

Thanks in advance,

Gary




Apr 11, 2007 1:50:38 PM
org.geotools.renderer.lite.StreamingRenderer processStylers
SEVERE: null
java.lang.ExceptionInInitializerError
at
org.geotools.coverage.processing.DefaultProcessor.<clinit>(

DefaultProcessor.java:86
)
at
org.geotools.renderer.lite.gridcoverage2d.GridCoverageRenderer.<clinit>(

GridCoverageRenderer.java:133
)
at
org.geotools.renderer.lite.StreamingRenderer.renderRaster(

StreamingRenderer.java:1958
)
at
org.geotools.renderer.lite.StreamingRenderer.processSymbolizers(

StreamingRenderer.java:1815
)
at
org.geotools.renderer.lite.StreamingRenderer.process(

StreamingRenderer.java:1759
)
at
org.geotools.renderer.lite.StreamingRenderer.processStylers(

StreamingRenderer.java:1704
)
at
org.geotools.renderer.lite.StreamingRenderer.paint(

StreamingRenderer.java:724
)
at
org.geotools.renderer.lite.StreamingRenderer.paint(

StreamingRenderer.java:446
)
at
com.sonalysts.nimbusTestClient.MapGraphics$1.run(

MapGraphics.java:427
)
at
org.eclipse.swt.widgets.RunnableLock.run(

RunnableLock.java:35
)
at
org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(

Synchronizer.java:123
)
at
org.eclipse.swt.widgets.Display.runAsyncMessages(
Display.java:3325
)
at
org.eclipse.swt.widgets.Display.readAndDispatch(
Display.java:2971
)
at
org.eclipse.ui.internal.Workbench.runEventLoop(

Workbench.java:1930
)
at
org.eclipse.ui.internal.Workbench.runUI(

Workbench.java:1894
)
at
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(

Workbench.java:422
)
at
org.eclipse.ui.PlatformUI.createAndRunWorkbench(

PlatformUI.java:149
)
at
com.sonalysts.nimbusTestClient.Application.run(

Application.java:20
)
at
org.eclipse.core.internal.runtime.PlatformActivator$1.run(

PlatformActivator.java:78
)
at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(

EclipseAppLauncher.java:92
)
at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(

EclipseAppLauncher.java:68
)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(

EclipseStarter.java:400
)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(

EclipseStarter.java:177
)
at
sun.reflect.NativeMethodAccessorImpl.invoke0(
Native
Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.eclipse.core.launcher.Main.invokeFramework(
Main.java:336
)
at
org.eclipse.core.launcher.Main.basicRun(
Main.java:280
)
at
org.eclipse.core.launcher.Main.run(
Main.java:977
)
at
org.eclipse.core.launcher.Main.main(
Main.java:952
)
Caused by:

java.lang.ClassCastException
:
com.sun.media.jai.imageioimpl.ImageReadWriteSpi
at
javax.media.jai.OperationRegistry.registerServices(

OperationRegistry.java:2047
)
at
javax.media.jai.ThreadSafeOperationRegistry.registerServices(

ThreadSafeOperationRegistry.java:612
)
at
javax.media.jai.OperationRegistry.initializeRegistry(

OperationRegistry.java:365
)
at
javax.media.jai.JAI.<clinit>(
JAI.java:560
)

Gary W. Lucas
Sonalysts, Inc.
215 Parkway North
Waterford CT 06320, USA
(860) 326-3682