Could not find MessageBodyWriter for response object of type: java.util.ArrayList of media type: text/html - in Resteasy

Question

I am developing RESTEasy Example. In this example I am using all latest dependencies and deploying om tomcat 8.x version. I can successfully deploy the applicat

Answer 1

To be more clear, for beginners. add the

@XmlRootElement(name = "yourClassLowerCased") at the beginning of your class, like

package org.dlss.entities;
import javax.persistence.*;
import javax.xml.bind.annotation.XmlRootElement;


@Entity //The class will be a javax.persistence Entity (could be stored in a DB)
@Table(name = "person", schema = "public", catalog = "<databaseName>") //Table name
@XmlRootElement(name = "person")
public class PersonEntity {


    @Id //Following field will be the id of the table
    @GeneratedValue(strategy = GenerationType.IDENTITY) //Will be autoincremented when generated for type SERIAL into postgresql
    private Integer id;

Answer 2

Now I am able to solve this issue. I need to add following dependency in pom.xml:

<dependency>
        <groupId>org.jboss.resteasy</groupId>
        <artifactId>resteasy-jaxb-provider</artifactId>
        <version>3.0.16.Final</version>
</dependency>

And 1) I should be using @Produces(MediaType.APPLICATION_XML) on method signature to get following response.

<collection>
<student>
<student_id>0</student_id>
<student_name>Ricky</student_name>
<student_rollnumber>AOHP451</student_rollnumber>
</student>
<student>
<student_id>1</student_id>
<student_name>Mayer</student_name>
<student_rollnumber>DKLP987</student_rollnumber>
</student>
</collection>

2) If you want to use @Produces(MediaType.TEXT_PLAIN) then code will gives you following output which doesn't looks useful.

[com.mkyong.rest.Student@4d5fd75e, com.mkyong.rest.Student@7715574d]

So use 1) solution.

Answer 3

For me it was about trying to serialize the array to XML. If you would like that it would need a wrapper class like this for movies:

@XmlRootElement(name = "movies")
@XmlAccessorType(XmlAccessType.FIELD)
public class Movies
{
    @XmlElement(name = "movie")
    private List<Movie> movies;

    public List<Movie> getMovies() {
        return movies;
    }

    public void setMovies(List<Movie> movies) {
        this.movies = movies;
    }
}

This way it can be serialized under the root object.

Answer 4

Try to add particular version of serializer

    <dependency>
        <groupId>org.jboss.resteasy</groupId>
        <artifactId>resteasy-jackson-provider</artifactId>
        <version>${resteasy.version}</version>
    </dependency>

Answer 5

@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)

adding those annotations solved my issue.

Answer 6

(For those who find the question, working with quarkus)

Using this setup routine:

mvn io.quarkus:quarkus-maven-plugin:0.16.1:create     -DprojectGroupId=com.sample     -DprojectArtifactId=hello-quarkus     -DclassName="com.sample.DemoEndpoint"     -Dpath="/persons"

To fix the issue described here, I had to add this dependency.

<dependency>
  <groupId>io.quarkus</groupId>
  <artifactId>quarkus-resteasy-jsonb</artifactId>
</dependency>

here is my full pom.xml after I added the above dependency. Again, 99% of the below pom.xml came from the mvn command above.

<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.sample</groupId>
  <artifactId>hello-quarkus</artifactId>
  <version>1.0-SNAPSHOT</version>
  <properties>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <surefire-plugin.version>2.22.0</surefire-plugin.version>
    <quarkus.version>0.16.1</quarkus.version>
    <maven.compiler.source>1.8</maven.compiler.source>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.target>1.8</maven.compiler.target>
  </properties>
  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>io.quarkus</groupId>
        <artifactId>quarkus-bom</artifactId>
        <version>${quarkus.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>io.quarkus</groupId>
      <artifactId>quarkus-resteasy</artifactId>
    </dependency>


    <!-- ADDED MAGIC HERE -->
    <dependency>
      <groupId>io.quarkus</groupId>
      <artifactId>quarkus-resteasy-jsonb</artifactId>
    </dependency>




    <dependency>
      <groupId>io.quarkus</groupId>
      <artifactId>quarkus-junit5</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>io.rest-assured</groupId>
      <artifactId>rest-assured</artifactId>
      <scope>test</scope>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>io.quarkus</groupId>
        <artifactId>quarkus-maven-plugin</artifactId>
        <version>${quarkus.version}</version>
        <executions>
          <execution>
            <goals>
              <goal>build</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-surefire-plugin</artifactId>
        <version>${surefire-plugin.version}</version>
        <configuration>
          <systemProperties>
            <java.util.logging.manager>org.jboss.logmanager.LogManager</java.util.logging.manager>
          </systemProperties>
        </configuration>
      </plugin>
    </plugins>
  </build>
  <profiles>
    <profile>
      <id>native</id>
      <activation>
        <property>
          <name>native</name>
        </property>
      </activation>
      <build>
        <plugins>
          <plugin>
            <groupId>io.quarkus</groupId>
            <artifactId>quarkus-maven-plugin</artifactId>
            <version>${quarkus.version}</version>
            <executions>
              <execution>
                <goals>
                  <goal>native-image</goal>
                </goals>
                <configuration>
                  <enableHttpUrlHandler>true</enableHttpUrlHandler>
                </configuration>
              </execution>
            </executions>
          </plugin>
          <plugin>
            <artifactId>maven-failsafe-plugin</artifactId>
            <version>${surefire-plugin.version}</version>
            <executions>
              <execution>
                <goals>
                  <goal>integration-test</goal>
                  <goal>verify</goal>
                </goals>
                <configuration>
                  <systemProperties>
                    <native.image.path>${project.build.directory}/${project.build.finalName}-runner</native.image.path>
                  </systemProperties>
                </configuration>
              </execution>
            </executions>
          </plugin>
        </plugins>
      </build>
    </profile>
  </profiles>
</project>