CODEWITHSUNDEEP
javarestjax-rs
user7826451
user7826451

Reputation:

JAX RS MessageBodyWriter not found for media type=application/json

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.

Upvotes: 2

Views: 8080

Answers (2)

Andrew Norman
Andrew Norman

Reputation: 911

there's an ordering issue as the Jackson and Jackson / jersey jars don't play well in an "uber" assembly jar. This is because they have same-named files in their individual jars that contain different values.

The assembly plugin will pick one version as the "winner" that gets included in the uber jar. The losing duplicate will not be included and in your case, you are likely getting the wrong copy included in your uber jar.

To fix this, make sure that these 2 entries are moved to the top of the maven dependencies list

<dependency>
  <groupId>org.glassfish.jersey.media</groupId>
  <artifactId>jersey-media-json-jackson</artifactId>
  <version>${jersey-version}</version>
</dependency>
<dependency>
  <groupId>com.fasterxml.jackson.jaxrs</groupId>
  <artifactId>jackson-jaxrs-json-provider</artifactId>
  <version>${jackson-version}</version>
</dependency>

I also moved this one at the bottom of the dependencies:

<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>${jackson-version}</version>
</dependency>

That combination seemed to fix the uber jar issue in my situation.

Upvotes: 1

mentallurg
mentallurg

Reputation: 5207

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>

Upvotes: 3

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