How to load GeoTIFF using Geotools?

Question

I'm having trouble to load a GeoTIFF file using Geotools (never used it before). What I've tried so far:

File koppenClassificationTif = new File("mongodb-repository/src/main/resources/land_shallow_topo_2048.tif");    
GeoTiffFormat format = new GeoTiffFormat();
Hints hints = new Hints(Hints.FORCE_LONGITUDE_FIRST_AXIS_ORDER, Boolean.TRUE);
GeoTiffReader reader = format.getReader(koppenClassificationTif, hints);

The GeoTiffFormat could not be initialized because of java.lang.NoSuchMethodError: 'javax.measure.Unit javax.measure.Unit.multiply(java.lang.Number)'. My .m2 repository contain 2 versions javax/measure/unit-api but I don't see why this would be a problem.

I've also tried to directly use GeoTiffReader reader = new GeoTiffReader(koppenClassificationTif); which throw this exception:

org.geotools.data.DataSourceException: class org.apache.sis.referencing.factory.GeodeticObjectFactory cannot be cast to class org.opengis.referencing.Factory (org.apache.sis.referencing.factory.GeodeticObjectFactory and org.opengis.referencing.Factory are in unnamed module of loader 'app')

I'm using newly released 25.0 but I've been experiencing the same issue using 24.2

    <dependency>
        <groupId>org.geotools</groupId>
        <artifactId>gt-geojsondatastore</artifactId>
        <version>${geotools.version}</version>
    </dependency>
    <dependency>
        <groupId>org.geotools</groupId>
        <artifactId>gt-referencing</artifactId>
        <version>${geotools.version}</version>
    </dependency>
    <dependency>
        <groupId>org.geotools</groupId>
        <artifactId>gt-coverage</artifactId>
        <version>${geotools.version}</version>
    </dependency>
    <dependency>
        <groupId>org.geotools</groupId>
        <artifactId>gt-opengis</artifactId>
        <version>${geotools.version}</version>
    </dependency>
    <dependency>
        <groupId>org.geotools</groupId>
        <artifactId>gt-geotiff</artifactId>
        <version>${geotools.version}</version>
    </dependency>
    <dependency>
        <groupId>org.geotools</groupId>
        <artifactId>gt-main</artifactId>
        <version>${geotools.version}</version>
    </dependency>
</dependencies>

<repositories>
    <repository>
        <id>osgeo-alt</id>
        <url>https://repo.osgeo.org/repository/release</url>
    </repository>
</repositories>

<properties>
    <geotools.version>25.0</geotools.version>
</properties>

Answer 1

You don't seem to be providing an implementation of the referencing module, see the GeoTools FAQ for more details, but adding gt-epsg-hsql should solve your issue.

Answer 2

I had a similar issue with gt-geotiff version 26.0 having conflicting dependencies with another package. In my case I could resolve it by explicitly loading a newer version of unit-api in the dependencies:

<dependency>
    <groupId>javax.measure</groupId>
    <artifactId>unit-api</artifactId>
    <version>2.0</version>
    <type>jar</type>
</dependency>

You can also exclude the older dependency by adding

<exclusions>
    <exclusion>
        <groupId>javax.measure</groupId>
        <artifactId>unit-api</artifactId>
    </exclusion>
</exclusions>

to the <dependency> section of its package, just to be sure.

However, the cleaner way to solve such problems is to have both packages depend on the same GeoTools version.