CODEWITHSUNDEEP
springresttemplatespring-restcontrollerspring-rest
EralpB
EralpB

Reputation: 1742

RestTemplate can't fetch JSONObject

I can't fetch JSONObject directly, this code works:

RestTemplate restTemplate = new RestTemplate();
String str = restTemplate.getForObject("http://127.0.0.1:8888/books", String.class);
JSONObject bookList = new JSONObject(str);

but this code doesn't:

JSONObject bookList = restTemplate.getForObject("http://127.0.0.1:8888/books", JSONObject.class);

What could be the problem? It doesn't give errors but I've an empty JSONObject in the end.

my pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>library-client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>LibraryClient</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
        </dependency>
        <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

and I have to add a bit more details you can see when I use a string to cast inbetween it works. and a bit more details, maybe I should delete my pom.xml to reduce the amount of code in this question, would that make sense? | Okay more?

Upvotes: 12

Views: 17198

Answers (2)

Ondra Žižka
Ondra Žižka

Reputation: 46904

I assume you do not specifically need javax.json.JSONObject, but rather any generic JSON object tree.

Your POM has jackson-databind, which makes RestTemplate (and Spring Web in general) work with com.fasterxml.jackson.databind.JsonNode.

So, this will work:

JsonNode bookList = restTemplate.getForObject("http://127.0.0.1:8888/books", JsonNode.class);

int count = bookList.get("count").asInt(); // Null check omitted.

Upvotes: 2

Angelo Immediata
Angelo Immediata

Reputation: 6954

RestTemplate will use reflection in order to create the resulting object

When you use restTemplate.getForObject it will try to use the default constructor of the class you pass and then tries to fill all its fields In this case it doesn't know how to create the JSONObject

In order to do it you must:

  • use your own HttpMessageConverterExtractor
  • use the second approach JSONObject bookList = new JSONObject(str);

Upvotes: 11

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