我想在mysql workbranch的帮助下将spring-boot应用程序与数据库连接起来

o.a.tomcat.jdbc.pool.ConnectionPool      : Unable to create initial connections of pool.

是我得到的例外
pom.xml文件

<dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.27</version>
        </dependency>

应用程序属性

spring.thymeleaf.mode=LEGACYHTML5

# toa gore mora

# ===============================

# = DATA SOURCE

# ===============================

# Set here configurations for the database connection

# Connection url for the database "netgloo_blog"

spring.datasource.url = jdbc:mysql://localhost:3306/OnlineBanking

# Username and secret

spring.datasource.username = root
spring.datasource.password =

# Keep the connection alive if idle for a long time (needed in production)

spring.datasource.tomcat.max-active=1

# ===============================

# = JPA / HIBERNATE

# ===============================

# Use spring.jpa.properties.* for Hibernate native properties (the prefix is

# stripped before adding them to the entity manager).

# Show or not log for each sql query

spring.jpa.show-sql = true

# Hibernate ddl auto (create, create-drop, update): with "update" the database

# schema will be automatically updated accordingly to java entities found in

# the project

spring.jpa.hibernate.ddl-auto = update

# Allows Hibernate to generate SQL optimized for a particular DBMS

spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

在mysql中，这里设置的是workbranch服务器image:httpshttp://i.stack.imgur.com/f3g4s.png
我知道这个错误

2018-05-13 22:04:38.234 ERROR 6176 --- [           main] o.a.tomcat.jdbc.pool.ConnectionPool      : Unable to create initial connections of pool.

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_162]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_162]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_162]
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_162]
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411) ~[mysql-connector-java-5.1.27.jar:na]

有人能帮我把spring boot和数据库连接起来吗？谢谢