How do I include RestEasy Jackson2Provider in jar-with-dependencies? - jackson

Question

I have a java rest service client that I am packaging up using the maven-assembly-plugin. I am creating a zip file containing all of the dependencies plus a jar-with-dependencies. So I end up with:
my-client-1.2-bin.zip
my-client-1.2-jar-with-dependencies.jar
I have written a small test java app that calls the client so that I can test the dependencies. If I unzip the dependency zip and add all of the jars to the class path, I am able to use the client successfully. If I attempt to only add the jar-with-dependency to my class path, it fails unless I also add the RestEasy Jackson2Provider jar to my classpath. I have confirmed that the ResetEasy Jackson2Provider is available in the jar-with-dependency jar file.
Here is the relevent part of my pom:
<dependencies>
<!-- https://mvnrepository.com/artifact/org.jboss.resteasy/resteasy-jaxrs -->
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxrs</artifactId>
<version>3.1.2.Final</version>
<scope>runtime</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.jboss.resteasy/resteasy-jackson2-provider -->
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jackson2-provider</artifactId>
<version>3.1.2.Final</version>
<scope>runtime</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.jboss.resteasy/resteasy-client -->
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-client</artifactId>
<version>3.1.2.Final</version>
<scope>runtime</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.jboss.resteasy/resteasy-jaxb-provider -->
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxb-provider</artifactId>
<version>3.1.2.Final</version>
<scope>runtime</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.jboss.resteasy/resteasy-jaxrs-services -->
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxrs-services</artifactId>
<version>3.1.2.Final</version>
<scope>runtime</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpcore -->
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.4.6</version>
<scope>runtime</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.3</version>
<scope>runtime</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.jboss.logging/jboss-logging -->
<dependency>
<groupId>org.jboss.logging</groupId>
<artifactId>jboss-logging</artifactId>
<version>3.3.1.Final</version>
<scope>runtime</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.jaxrs/jackson-jaxrs-base -->
<dependency>
<groupId>com.fasterxml.jackson.jaxrs</groupId>
<artifactId>jackson-jaxrs-base</artifactId>
<version>2.8.8</version>
<scope>runtime</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.6</version>
<configuration>
<dependencySets>
<dependencySet>
<outputDirectory>lib</outputDirectory>
<scope>runtime</scope>
</dependencySet>
</dependencySets>
<descriptors>
<descriptor>src/assembly/client.xml</descriptor>
</descriptors>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
<pluginRepositories>
<pluginRepository>
<id>onejar-maven-plugin.googlecode.com</id>
<url>http://onejar-maven-plugin.googlecode.com/svn/mavenrepo</url>
</pluginRepository>
</pluginRepositories>
src/assembly/client.xml
<?xml version="1.0" encoding="UTF-8"?>
<assembly
xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2
http://maven.apache.org/xsd/assembly-1.1.2.xsd">
<id>bin</id>
<formats>
<format>zip</format>
<format>tar.gz</format>
</formats>
<dependencySets>
<dependencySet>
<outputDirectory>lib</outputDirectory>
<scope>runtime</scope>
</dependencySet>
</dependencySets>
</assembly>

Answer 1

I ran into a similar problem when using the shade plugin. This is because the transformers in the Metadata folder is overwritten by the shade/assembly plugins. I could resolve it by using the following
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>path.to.your.main.Class</mainClass>
</transformer>
<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
<resource>META-INF/spring.handlers</resource>
</transformer>
<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
<resource>META-INF/spring.schemas</resource>
</transformer>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>