I ran into a similar problem while using QDigest.
Shading the clearspring, fastutil classes solves the problem.
Snippet from pom.xml :
<plugin>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<artifactSet>
<includes>
<include>com.clearspring.analytics:stream</include>
<include>it.unimi.dsi:fastutil</include>
</includes>
</artifactSet>
<relocations>
<relocation>
<pattern>it.unimi.dsi</pattern>
<shadedPattern>atom.it.unimi.dsi</shadedPattern>
</relocation>
<relocation>
<pattern>com.clearspring.analytics.stream</pattern>
<shadedPattern>atom.com.clearspring.analytics.stream</shadedPattern>
</relocation>
</relocations>
<shadedArtifactAttached>true</shadedArtifactAttached>
<outputDirectory>${project.build.directory}</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
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