I am creating Rest client using JAX RS Jersey 2. The client works but only in my IDE (IntellIJ IDEA), when I build it with Maven, using maven-assembly-plugin and run the jar it doesn’t work anymore.
I get MessageBodyWriter not found for media type=application/json error.
I have tried adding more dependencies that people suggested in other posts but I don’t think a dependency is a problem since it runs in the IDE.
Here is the code that throws the exception
return client.target(uri) .request(MediaType.APPLICATION_JSON) .post(Entity.entity(transactions.get(0), MediaType.APPLICATION_JSON));
After debugging, when I replace transactions.get(0) with an empty string “”, it works.
Here is the pom.xml for maven
<build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>11</source> <target>11</target> </configuration> </plugin> <plugin> <artifactId>maven-assembly-plugin</artifactId> <configuration> <archive> <manifest> <mainClass>SequencerControllers</mainClass> </manifest> </archive> <descriptorRefs> <descriptorRef>jar-with-dependencies</descriptorRef> </descriptorRefs> </configuration> </plugin> </plugins> </build> <dependencies> <dependency> <groupId>com.sparkjava</groupId> <artifactId>spark-core</artifactId> <version>2.8.0</version> </dependency> <dependency> <groupId>org.glassfish.jersey.core</groupId> <artifactId>jersey-client</artifactId> <version>2.25.1</version> </dependency> <dependency> <groupId>org.glassfish.jersey.media</groupId> <artifactId>jersey-media-json-jackson</artifactId> <version>2.25.1</version> </dependency> <dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.8.0</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-simple</artifactId> <version>1.7.21</version> </dependency> </dependencies>
Am i missing something? Really bothers me that it runs in the IDE but not when built with Maven since I build it with dependencies.
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Answer
Check if you have class com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider
in your resulting JAR. If not, add following dependency:
<dependency> <groupId>com.fasterxml.jackson.jaxrs</groupId> <artifactId>jackson-jaxrs-json-provider</artifactId> <version>2.10.0</version> </dependency>