java – 无法使用JDBC连接到mySql docker容器

我用Docker Maven Plugin

当测试集成开始时,我可以使用以下命令连接到终端上的容器上的mysql：

mysql -h 127.0.0.1 -P 32795 -uroot -p

并且每一件事情都很好,但是当我想用java代码连接这个代码时,在java应用程序中连接mysql：

Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection connection = DriverManager.getConnection(
    "jdbc:mysql://127.0.0.1:" + System.getProperty("mysqlPort") + "/dashboardmanager","root","root"
);

我收到此错误：

org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: Cannot create PoolableConnectionFactory (Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)
    at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80) ~[spring-jdbc-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:615) ~[spring-jdbc-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:866) ~[spring-jdbc-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:927) ~[spring-jdbc-4.2.4.RELEASE.jar:4.2.4.RELEASE]
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:937) ~[spring-jdbc-4.2.4.RELEASE.jar:4.2.4.RELEASE]

我试过了：

export _JAVA_OPTIONS="-Djava.net.preferIPv4Stack=true"

和

System.setProperty("java.net.preferIPv4Stack","true");

但没有改变.

Docker Maven Plugin Conf：