Question 334525 in Json Question posted in
Our archive of expertly curated questions and answers provides insights and solutions to common problems related to this popular data interchange format. From parsing and manipulating JSON data to integrating it with various programming languages and web services, our archive has got you covered. Start exploring today and take your JSON skills to the next level

Json – Runtime error when calling a REST service that returns List<String> deployed in WebLogic

I’m deploying a REST service written in Java on WebLogic.
The method I’m interested in has this signature:

@GET
@Produces({ MediaType.APPLICATION_JSON })
@Path("/myway/mock")
public List<String> getMyMock(@QueryParam("pic") String pic, @QueryParam("year") int year)

After I deploy this service to WebLogic I’m calling it from curl or Postman and I see this error in WebLogic logs:

<org.glassfish.jersey.message.internal.WriterInterceptorExecutor> <MessageBodyWriter not found for media type=application/json, type=class java.util.ArrayList, genericType=java.util.List<java.lang.String>.>
Feb 02, 2024 4:09:22 PM org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor aroundWriteTo
SEVERE: MessageBodyWriter not found for media type=application/json, type=class java.util.ArrayList, genericType=java.util.List<java.lang.String>.

If I return just a String from this method, it works fine. Only when I try to return List I have this issue. I guess it is due to the fact that WebLogic can’t figure out how to return MediaType.APPLICATION_JSON from List, but there must be a way.

Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    This is what worked for me in the main pom.xml:

    <dependency>
    <groupId>org.glassfish.jersey.media</groupId>
    <artifactId>jersey-media-json-jackson</artifactId>
    <version>2.28</version>
</dependency>

  2. 0

    Use Json serializer in the classpath. Try adding this dependency in pom.xml

    <dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.16.1</version>
</dependency>
    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search