OM6b : is JAI needed (again?)

[Bart Jourquin]

Hi,

It seems that the latest om6b sources are dependent on JAI (again?). This is a stack trace for a MapTileLayer:

java.lang.ClassNotFoundException: javax.media.jai.JAI

at java.net.URLClassLoader.findClass(URLClassLoader.java:381)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:348)

at com.bbn.openmap.util.ComponentFactory._create(ComponentFactory.java:432)

at com.bbn.openmap.util.ComponentFactory.create(ComponentFactory.java:390)

at com.bbn.openmap.util.ComponentFactory.create(ComponentFactory.java:369)

at com.bbn.openmap.util.ComponentFactory.create(ComponentFactory.java:295)

at com.bbn.openmap.image.BufferedImageHelper.getJAI(BufferedImageHelper.java:73)

at com.bbn.openmap.image.BufferedImageHelper.getJAIBufferedImage(BufferedImageHelper.java:92)

at com.bbn.openmap.image.BufferedImageHelper.getJAIBufferedImage(BufferedImageHelper.java:178)

at com.bbn.openmap.image.BufferedImageHelper.getBufferedImage(BufferedImageHelper.java:225)

at com.bbn.openmap.image.BufferedImageHelper.getBufferedImage(BufferedImageHelper.java:202)

at com.bbn.openmap.dataAccess.mapTile.StandardMapTileFactory.load(StandardMapTileFactory.java:201)

at com.bbn.openmap.dataAccess.mapTile.StandardMapTileFactory.loadTile(StandardMapTileFactory.java:750)

at com.bbn.openmap.dataAccess.mapTile.StandardMapTileFactory.getTiles(StandardMapTileFactory.java:643)

at com.bbn.openmap.dataAccess.mapTile.StandardMapTileFactory.getTiles(StandardMapTileFactory.java:531)

at com.bbn.openmap.layer.image.MapTileLayer.prepare(MapTileLayer.java:232)

Note that the layer is correctly displayed. I've just this ugly stack trace in the console... 

Any hint ?

Bart

[Don Dietrick]

Hi Bart,

It shouldn’t be required, but used if available. I’ll have to check into it. 

-- Don

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[Bart Jourquin]

Hi Don,

Digging in the source code, I found the following warning in com.bbn.openmap.util.ComponentFactory._create(…)

 // Apparently, this fails in certain cases where OpenMap is being

 // used as a plugin in a NetBeans or Eclipse architecture and the

 // application classloader isn't aware of the plugins classes. It

 // limits the creation of the object to classes in the caller's

 // classloader.

I’m not sure what this exactly means, but it comes out that the stack trace was indeed thrown in my Eclipse environment, and that nor error is thrown when my application runs standalone. No problem thus.

In order to avoid this exception when working in Eclipse, I’ve added the following « fake » class in my source tree:

package javax.media.jai;

public class JAI {

  public JAI() {}

  public Object create(String s, Object o) {

    return null;

  }

}

BTW : Is there a date scheduled for the release of OM6 (non beta)?

Bart