nginx:
    image: nginx
    links:
     - web
    ports:
     - "80:80"
    volumes:
     - ./nginx.conf:/etc/nginx/nginx.conf

  web:
    image: tomcat:8.0-jre8
    links:
      - mongo
      - mysql
    volumes:
     - ./bint.war:/usr/local/tomcat/webapps/bint.war
     - ./tomcat-users.xml:/usr/local/tomcat/conf/tomcat-users.xml

  mongo:
    image: mongo:2.7
    ports:
      - "27017:27017"
  mysql:
    image: mysql
    ports:
      - "3306:3306"
    environment:
      MYSQL_ROOT_PASSWORD: rootpass
      MYSQL_DATABASE: database
      MYSQL_USER: user
      MYSQL_PASSWORD: pass

Docker version 1.12.0-rc2, build 906eacd, experimental
docker-compose version 1.8.0-rc1, build 9bf6bc6
docker-machine version 0.8.0-rc1, build fffa6c9

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
    web_1    | Caused by: java.net.ConnectException: Connection refused
web_1    |  at java.net.PlainSocketImpl.socketConnect(Native Method)
web_1    |  at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
web_1    |  at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
web_1    |  at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
web_1    |  at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
web_1    |  at java.net.Socket.connect(Socket.java:589)
web_1    |  at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:214)
web_1    |  at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:298)
web_1    |  ... 58 more

web_1    | Caused by: org.springframework.beans.TypeMismatchException: Failed to convert value of type [java.lang.String] to required type [int]; nested exception is java.lang.NumberFormatException: For input string: "tcp://172.17.0.3:27017"
web_1    |  at org.springframework.beans.TypeConverterSupport.doConvert(TypeConverterSupport.java:77)
web_1    |  at org.springframework.beans.TypeConverterSupport.convertIfNecessary(TypeConverterSupport.java:54)
web_1    |  at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1033)
web_1    |  at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014)
web_1    |  at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:545)
web_1    |  ... 28 more