Spring reactive issue

buildscript {
    ext {
        springBootVersion = '2.0.0.BUILD-SNAPSHOT'
    }
    repositories {
        mavenCentral()
        maven { url "https://repo.spring.io/snapshot" }
        maven { url "https://repo.spring.io/milestone" }
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
    }
}

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

jar {
    baseName = 'demo'
    version = '0.0.1-SNAPSHOT'
}
sourceCompatibility = 1.8
targetCompatibility = 1.8

repositories {
    mavenCentral()
    maven { url "https://repo.spring.io/snapshot" }
    maven { url "https://repo.spring.io/milestone" }
}


dependencies {
    compile('org.springframework.boot:spring-boot-starter-cache')
    compile('org.springframework.boot:spring-boot-starter-data-jpa')
    compile('org.springframework.boot:spring-boot-starter-data-mongodb')
    compile('org.springframework.boot:spring-boot-starter-data-redis')
    compile('org.springframework.boot:spring-boot-starter-data-rest')
    compile('org.springframework.data:spring-data-rest-hal-browser')
    compile('org.springframework.boot.experimental:spring-boot-starter-web-reactive')
    compile('org.springframework.boot:spring-boot-starter-hateoas')
    compile('org.springframework.retry:spring-retry')
    compile('org.springframework.boot:spring-boot-starter-security')
    compile('org.springframework.boot:spring-boot-starter-web')

    compile("com.h2database:h2")

    testCompile('org.springframework.boot:spring-boot-starter-test')
    testCompile('org.springframework.restdocs:spring-restdocs-mockmvc')
}

dependencyManagement {
    imports {
        mavenBom "org.springframework.boot.experimental:spring-boot-dependencies-web-reactive:0.1.0.BUILD-SNAPSHOT"
    }
}