java - 线程 "main"中的异常 org.springframework.jdbc.CannotGetJdbcConnectionException

Question

请帮我解决这个错误，我是 Spring 的新手。所以当我尝试在没有 spring MVC web 结构的情况下运行测试数据源时，我无法理解这个错误

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 我正在使用 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;
    }
}

同时找到下面这个错误的截图。

enter image description here

Answer 1

错误与数据库连接有关。检查您现在使用的数据。可能没有创建与您连接的名称相同的数据库。