Maven + Spring Boot: Found multiple occurrences of org.json.JSONObject on the class path:

Add under

 <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>

The following exclusion:

 <scope>test</scope>
    <exclusions>
        <exclusion>
            <groupId>com.vaadin.external.google</groupId>
            <artifactId>android-json</artifactId>
        </exclusion>
    </exclusions>

Similarly, for Gradle projects:

testCompile("org.springframework.boot:spring-boot-starter-test") {
    exclude group: "com.vaadin.external.google", module:"android-json"
}