okhttp: Retrofit + OkHTTP causes memory leaks in Tomcat

creation of OkHttpClient with ConnectionPool:

@Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
@Bean(name = "closeableOKHTTP")
public OkHttpClient closeableOKHTTP() {
    ConnectionPool pool = new ConnectionPool(5, 1, TimeUnit.SECONDS);
    OkHttpClient client = new OkHttpClient.Builder() //
            .connectTimeout(3, TimeUnit.MINUTES) //
            .followRedirects(true) //
            .readTimeout(3, TimeUnit.MINUTES) //
            .retryOnConnectionFailure(false) //
            .writeTimeout(3, TimeUnit.MINUTES). //
            connectionPool(pool) //
            .build();
    return client;
}

building service:

SocialRemoteService getRemote() {
    Gson gson = new GsonBuilder() //
            .setLenient() //
            .create();
    return new Retrofit.Builder() //
            .baseUrl(API) //
            .client(okHttpClient) //
            .addConverterFactory(GsonConverterFactory.create(gson)) //
            .callbackExecutor(daemonExecutor) //
            .build() //
            .create(SocialRemoteService.class);
}

@PreDestroy
public void destroy() {
    okHttpClient.connectionPool().evictAll();
}

service:

public interface SocialRemoteService {

    @GET("cities")
    public Call<List<SocialCity>> cities(@Query("searchField") String searchField);

}

Tomcat logs on un-deploy: http://pastebin.com/3s091BKh

Is there any way to prevent memory leaks using retrofit and okhttp? okHttpClient.connectionPool().evictAll() even with new ConnectionPool(5, 1, TimeUnit.SECONDS) does not seem to work.

dependencies:

• okhttp3 - 3.2.0
• retrofit2 - 2.0.1
• retrofit2 converter-gson - 2.0.1
• tomcat8 - Apache Tomcat/8.0.32
• java8 - 1.8.0_74-b02