异常线程“main” org.springframework.jdbc.CannotGetJdbcConnectionException

Question

请帮我这个错误，我是新来的春天。因此，我不能与此错误理解，而我尝试在运行测试数据源不带弹簧的MVC Web结构

cd F:\NetBeansProjects\SpringContactApp; "JAVA_HOME=C:\\Program Files\\Java\\jdk1.8.0_131" cmd /c "\"\"C:\\Program Files\\NetBeans 8.0.1\\java\\maven\\bin\\mvn.bat\" -Dexec.args=\"-classpath %classpath in.ezeon.capp.test.TestDataSource\" -Dexec.executable=java -Dexec.classpathScope=test -Dmaven.ext.class.path=\"C:\\Program Files\\NetBeans 8.0.1\\java\\maven-nblib\\netbeans-eventspy.jar\" -Dfile.encoding=UTF-8 org.codehaus.mojo:exec-maven-plugin:1.2.1:exec\""
        Running NetBeans Compile On Save execution. Phase execution is skipped and output directories of dependency projects (with Compile on Save turned on) will be used instead of their jar artifacts.
        Scanning for projects...

        ------------------------------------------------------------------------
        Building SpringContactApp 1.0-SNAPSHOT
        ------------------------------------------------------------------------

        --- exec-maven-plugin:1.2.1:exec (default-cli) @ SpringContactApp ---
        Feb 04, 2019 12:15:40 PM org.springframework.context.annotation.AnnotationConfigApplicationContext prepareRefresh
        INFO: Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@531d72ca: startup date [Mon Feb 04 12:15:40 IST 2019]; root of context hierarchy
        Feb 04, 2019 12:15:40 PM org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor <init>
        INFO: JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
        Exception in thread "main" org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: Cannot create PoolableConnectionFactory (Could not create connection to database server. Attempted reconnect 3 times. Giving up.)
            at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)
            at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:619)
            at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:870)
            at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:931)
            at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:941)
            at in.ezeon.capp.test.TestDataSource.main(TestDataSource.java:23)
        Caused by: java.sql.SQLException: Cannot create PoolableConnectionFactory (Could not create connection to database server. Attempted reconnect 3 times. Giving up.)
            at org.apache.commons.dbcp2.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:2294)
            at org.apache.commons.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:2039)
            at org.apache.commons.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1533)
            at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
            at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
            ... 5 more
        Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.

下面的代码是SpringRootConfig.java类和TestDataSource.java类，我使用NetBeans 8和Spring框架。

package in.ezeon.capp.config;

import static java.lang.Boolean.TRUE;
import org.apache.commons.dbcp2.BasicDataSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

/**
 *
 * @author admin
 */
@Configuration
@ComponentScan(basePackages = {"in.ezeon.capp.dao"})
public class SpringRootConfig {
    //TODO: Services,DAO,DataSource,Email sender or some other business layer beans
    @Bean
    public BasicDataSource getDataSource()
    {
        BasicDataSource ds=new BasicDataSource();
        ds.setDriverClassName("com.mysql.jdbc.Driver");
        //ds.setUrl("jdbc:mysql://localhost:3306/capp_db?useUnicode=true&characterEncoding=UTF-8&useSSL=false&autoReconnect=true&failOverReadOnly=false");//localhost//127.0.0.1
        ds.setUrl("jdbc:mysql://localhost:3306/capp_db");
        ds.setUsername("root");
        ds.setPassword("dbadmin@123");//dbadmin@123
        ds.setMaxTotal(2);
        ds.setInitialSize(1);
        ds.setTestOnBorrow(true);
        ds.setValidationQuery("SELECT 1");
        ds.setDefaultAutoCommit(TRUE);
        return ds;
    }
}

并且还发现了下面的截图此错误。

enter image description here

Answer 1

该错误与数据库连接。检查你现在正在使用的数据。也许不是您连接相同的名称创建的数据库。

Answer 2

你的情况：

 Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException:
 Could not create connection to database server. Attempted reconnect 3 times. Giving up.

• 检查你的JDBC URL。
• 检查你的数据库的可用性（在该网址上，服务器上运行？端口？数据库？理想相同的驱动程序，同样的网络使用Netbeans“服务”选项卡..e.g>“数据库”）
• 检查网络/代理/防火墙，你英寸