oatomcat.jdbc.pool.ConnectionPool：无法创建池的初始连接。 春季启动+ MySql

Question

I want to connect Spring boot application with database with help of MySql WorkBranch

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

is the exception i get

pom.xml

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

application.properties

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

In MySql Workbranch server is set here is image: https://i.stack.imgur.com/F3G4s.png

I get this erros

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]

Can somebody help to connect spring boot with the database Thanks

Answer 1

Assuming you are in a development environment and security is not an issue for you, you can create a login by using the following SQL commands

CREATE USER 'jeffrey'@'*' IDENTIFIED BY 'password';
GRANT ALL ON * TO 'jeffrey'@'*';

See also

https://dev.mysql.com/doc/refman/8.0/en/create-user.html and https://dev.mysql.com/doc/refman/8.0/en/grant.html