Add raster layer or a WMS using geotools - problem to run the jar file from cmd

Question

I am using geotools in order to develop a custom GIS.

I tried to add a raster layer and a WMS based on the tutorials given by geotools. When i am running the project using the main class in Netbeans or Eclipse everything is working properly. However, when i tried to run the jar file from the cmd, the above functionalities crashes. Below you can see a screenshot which shows the error regarding the WMS.

I forgot to send that the project which i am working on is a Maven project.

Can you help me to understand where is the problem?

<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.11</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.geotools</groupId>
        <artifactId>gt-main</artifactId>
        <version>13.5</version>
    </dependency>
    <dependency>
        <groupId>org.geotools</groupId>
        <artifactId>gt-shapefile</artifactId>
        <version>13.5</version>
    </dependency>
    <dependency>
        <groupId>org.geotools</groupId>
        <artifactId>gt-swing</artifactId>
        <version>13.5</version>
    </dependency>
    <dependency>
    <groupId>org.geotools.xsd</groupId>
        <artifactId>gt-xsd-core</artifactId>
        <version>9.3</version>
    </dependency>
    <dependency>
        <groupId>org.geotools.xsd</groupId>
        <artifactId>gt-xsd-kml</artifactId>
        <version>9.3</version>
    </dependency>
    <dependency>
          <groupId>org.geotools.jdbc</groupId>
          <artifactId>gt-jdbc-postgis</artifactId>
          <version>13.5</version>
    </dependency>
    <dependency>
      <groupId>org.geotools</groupId>
      <artifactId>gt-geometry</artifactId>
      <version>${geotools.version}</version>
    </dependency>
    <dependency>
    <groupId>org.postgresql</groupId>
        <artifactId>postgresql</artifactId>
        <version>9.3-1103-jdbc41</version>
    </dependency>
            <dependency>
        <groupId>org.geotools</groupId>
        <artifactId>gt-epsg-hsql</artifactId>
        <version>${geotools.version}</version>
    </dependency>
    <dependency>
        <groupId>org.geotools</groupId>
        <artifactId>gt-geotiff</artifactId>
        <version>${geotools.version}</version>
    </dependency>
    <dependency>
        <groupId>org.geotools</groupId>
        <artifactId>gt-image</artifactId>
        <version>${geotools.version}</version>
    </dependency>
    <dependency>
        <groupId>org.geotools</groupId>
        <artifactId>gt-wms</artifactId>
        <version>${geotools.version}</version>
    </dependency>
</dependencies>

Answer 1

The problem you are facing is answered in the GeoTools FAQ - basically you need to combine all the required dependency jars into your executable jar so that users don't need to worry about the classpath. Normally this is pretty easy to achieve using the assembly plugin in maven, however when using GeoTools' datastores (and other factories) this will fail as only the last found SPI file in META-INF/services will be saved.

So you need to use the maven shade plugin to combine the services files into a single larger file that will work in the combined jar.

You need to add a block like the following to your maven pom file:

      <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-shade-plugin</artifactId>
          <version>2.4.3</version>
          <executions>
              <execution>
                  <phase>package</phase>
                  <goals>
                      <goal>shade</goal>
                  </goals>
                  <configuration>
                      <transformers>
                          <!-- This bit sets the main class for the executable jar as you otherwise -->
                          <!-- would with the assembly plugin                                       -->
                          <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                              <manifestEntries>
                                  <Main-Class>org.geotools.demo.Quickstart</Main-Class>
                              </manifestEntries>
                          </transformer>
                          <!-- This bit merges the various GeoTools META-INF/services files         -->
                          <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
                      </transformers>
                  </configuration>
              </execution>
          </executions>
      </plugin>

You'll need to change the main class name to match your program of course, and then run mvn package:shade to create the new jar.