I have written some code that uses some resteasy libraries.
The code works fine in Eclipse but produces exceptions when excecuted as fat-jar build with the maven shade plugin.
The reason: in the created jar under META-INF/services/javax.ws.rs.ext.Providers only the providers from resteasy-client are listed. I however also need the providers from resteasy-jackson2-provider and from resteasy-jaxrs.
I think the issue might be, that all 3 libraries (resteasy-client, resteasy-jackson2-provider, resteasy-jaxrs) use an identically named file to list their providers (META-INF/services/javax.ws.rs.ext.Providers). So maybe maven overwrites the provider list from one library with the list from the others?
My pom.xml looks like this:
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-client</artifactId>
<version>3.6.1.Final</version>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jackson2-provider</artifactId>
<version>3.6.1.Final</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.2.0</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<filters>
<filter>
<artifact>*:*</artifact>
<excludes>
<exclude>META-INF/*.SF</exclude>
<exclude>META-INF/*.DSA</exclude>
<exclude>META-INF/*.RSA</exclude>
</excludes>
</filter>
</filters>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<manifestEntries>
<Main-Class>playarounds.ServiceMainClass</Main-Class>
</manifestEntries>
</transformer>
</transformers>
<artifactSet/>
<outputFile>${project.build.directory}/${project.artifactId}-${project.version}-fat.jar</outputFile>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
Ok, i found the solution.
Maven shade plugin allows you to force append files that are identically named...
So what the maven-shade-plugin in the pom.xml lags is:
<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
<resource>META-INF/services/javax.ws.rs.ext.Providers</resource>
</transformer>
https://maven.apache.org/plugins/maven-shade-plugin/examples/resource-transformers.html#AppendingTransformer
The accepted answer is correct, but is for Maven's Shade plugin. If you're using Gradle's Shadow plugin, you must merge service descriptor files.
Using Gradle's Kotlin DSL:
tasks {
withType<ShadowJar> { mergeServiceFiles() }
}
Using Gradle's Groovy DSL:
shadowJar { mergeServiceFiles() }
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