vectorize polygon using JTS with range lookup

Question

I try to vectorize an image using java ie geotools with JAI.

The code is minimal and works just fine in intelliJ

InputStream stringAsStream = new ByteArrayInputStream(inputAsciiGrid.getBytes(StandardCharsets.UTF_8));
SimpleFeatureIterator vectorizedFeatures = extractor.execute(input, 0, true, null,
                null, classificationRanges, null).features();

My problem is when executing this via maven like:

mvn clean package && \
    java -jar target/quickstart-1.0.jar

it fails with exception of

RangeLookup: No OperationDescriptor is registered in the current operation registry under this name

sample code can be found at https://github.com/geoHeil/jts-vectorize

Note, the jar contains the class, but not the OperationDescriptors in the META-INF/registry.jai files.

jar -tf target/quickstart-1.0.jar| grep RangeLookupProcess                                                            
org/geotools/process/raster/RangeLookupProcess.class

edit

I tried to follow java.lang.ClassNotFoundException: it.geosolutions.jaiext.range.Range and added

<dependency>
            <groupId>it.geosolutions.jaiext.utilities</groupId>
            <artifactId>jt-utilities</artifactId>
            <version>1.1.8</version>
        </dependency>
        <dependency>
            <groupId>it.geosolutions.jaiext.iterators</groupId>
            <artifactId>jt-iterators</artifactId>
            <version>1.1.8</version>
        </dependency>

This changes the exception to:

Exception in thread "main" java.lang.NoClassDefFoundError: it/geosolutions/jaiext/utilities/ImageLayout2
    at FooJava.getAsciiGridFromstring(FooJava.java:49)
    at FooJava.main(FooJava.java:35)
Caused by: java.lang.ClassNotFoundException: it.geosolutions.jaiext.utilities.ImageLayout2
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 2 more
make: *** [run-java] Error 1

even though again the class is there:

geoheil@geoheilsMacBook ~/Downloads/vectorize/jts-vectorize                                                                 [20:36:45]
> $ jar -tf target/quickstart-1.0.jar| grep ImageLayout2                                                                  [±master ●●]
org/jaitools/imageutils/ImageLayout2.class

this seems to be a version mismatch. When reverting and adding the versions also listed in ( https://github.com/geotools/geotools/blob/18.4/pom.xml#L97 ):

<properties>
    <geotools.version>18.4</geotools.version>
    <jaiext.version>1.0.16</jaiext.version>
</properties>
<dependencies>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-main</artifactId>
            <version>${geotools.version}</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-arcgrid</artifactId>
            <version>${geotools.version}</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-process-raster</artifactId>
            <version>${geotools.version}</version>
        </dependency>
        <dependency>
            <groupId>it.geosolutions.jaiext.utilities</groupId>
            <artifactId>jt-utilities</artifactId>
            <version>1.1.1</version>
        </dependency>

        <dependency>
            <groupId>it.geosolutions.jaiext.rlookup</groupId>
            <artifactId>jt-rlookup</artifactId>
            <version>${jaiext.version}</version>
        </dependency>

    </dependencies>

The error is again the initial one.

edit 2

Manually registering the missing operation descriptor:

<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                    <resource>META-INF/javax.media.jai.registryFile.jai</resource>
                                </transformer>
                                <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                    <resource>META-INF/registryFile.jaiext</resource>
                                </transformer>

and adding both files (see names above) with content of:

# --- JAI ext manual re-registration ---
descriptor  it.geosolutions.jaiext.rlookup.RangeLookupDescriptor

gives me a new exception:

java.lang.RuntimeException: - Unable to render RenderedOp for this operation.
        at javax.media.jai.RenderedOp.createInstance(RenderedOp.java:827)
        at javax.media.jai.RenderedOp.createRendering(RenderedOp.java:867)
        at javax.media.jai.RenderedOp.getRendering(RenderedOp.java:888)
        at javax.media.jai.RenderedOp$1.getPropertyNames(RenderedOp.java:1791)
        at javax.media.jai.PropertyEnvironment.mapDefaults(PropertyEnvironment.java:270)
        at javax.media.jai.PropertyEnvironment.getPropertyNames(PropertyEnvironment.java:125)
        at javax.media.jai.WritablePropertySourceImpl.addProperties(WritablePropertySourceImpl.java:298)
        at javax.media.jai.RenderedOp.createPropertySource(RenderedOp.java:1817)
        at javax.media.jai.RenderedOp.getPropertyNames(RenderedOp.java:1851)
        at javax.media.jai.PropertySourceImpl.<init>(PropertySourceImpl.java:143)
        at org.geotools.coverage.AbstractCoverage.<init>(AbstractCoverage.java:139)
        at org.geotools.coverage.grid.AbstractGridCoverage.<init>(AbstractGridCoverage.java:102)
        at org.geotools.coverage.grid.GridCoverage2D.<init>(GridCoverage2D.java:186)
        at org.geotools.coverage.grid.GridCoverageFactory.create(GridCoverageFactory.java:589)
        at org.geotools.process.raster.RangeLookupProcess.execute(RangeLookupProcess.java:208)
        at org.geotools.process.raster.RangeLookupProcess.execute(RangeLookupProcess.java:234)
        at org.geotools.process.raster.PolygonExtractionProcess.execute(PolygonExtractionProcess.java:167)
        at FooJava.getWktForDbRangeFromRaster(FooJava.java:57)
        at FooJava.main(FooJava.java:36)

However, this is not necessarily to be considered as progress, ie now even IntelliJ fails to start. It fails with: ExceptionInInitializerError due to null pointer exception

Answer 1

I think the configuration of descriptors are read from registryFile.jai file.(*)

When jar with dependencies is created, registryFile.jai file is overwritten with the last jar's content. Merging registryFile.jai contents with the following configuration added to shade plugin corrects this issue. (this is added to github source you provided)

<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
   <resource>META-INF/registryFile.jai</resource>
</transformer>

(No need to create registryFile.jai in your projects resources/META-INF folder.)

(*) I tried adding configuration to different named file and it did not find the descriptor. Even with trying OperationRegistry.updateFromStream(is); command did not worked.