Jpa与Druid线程池及Spring Boot整合(一): spring-boot-starter-data-jpa 搭建持久层

                     

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(一)Jpa与Druid连接池及Spring Boot整合作为持久层,遇到系列问题,下面一 一记录：

pom.xml 文件中加入必须的依赖:

    org.springframework.boot
    spring-boot-starter-parent
    2.6.5 
    

---

---

   
    1.18.22

    5.8.18
    
    1.2.16
 
    8.0.28
    

---

    org.projectlombok
    lombok
    ${lombok.version}
    provided


    cn.hutool
    hutool-all
    ${hutool-all.version}




    mysql
    mysql-connector-java
    ${mysql-connector-java.version}





    com.alibaba
    druid
    ${druid.version}

    org.springframework.boot
    spring-boot-starter-data-jpa

    org.springframework.boot
    spring-boot-starter-web



    org.springframework.boot
    spring-boot-starter-actuator


    org.springframework.hateoas
    spring-hateoas



    org.springframework.boot
    spring-boot-devtools
    true

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(二) application.yml配置文件

server:
  port: 9999
  servlet:
    context-path: /
spring: 
 
  #使用JPA作为持久层框架与MYSQL整合---Begin---------------------
  datasource:
    url: jdbc:mysql://localhost:3306/tope-pay-user?&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=GMT%2B8&useSSL=false
    username: root
    password: 123456
    driverClassName: com.mysql.cj.jdbc.Driver # 8.0意思mysql驱动
    type: com.alibaba.druid.pool.DruidDataSource
    # 初始化大小，最小，最大
    initialSize: 5
    minIdle: 5
    maxActive: 20
    # 配置获取连接等待超时的时间
    maxWait: 60000
    # 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
    timeBetweenEvictionRunsMillis: 60000
    # 配置一个连接在池中最小生存的时间，单位是毫秒
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false

    testOnReturn: false
    # 打开PSCache，并且指定每个连接上PSCache的大小
    poolPreparedStatements: true
    maxPoolPreparedStatementPerConnectionSize: 20
    # 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
    filters: stat,wall,log4j
    # 通过connectProperties属性来打开mergeSql功能；慢SQL记录
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
    # 合并多个DruidDataSource的监控数据
    #spring.datasource.useGlobalDataSourceStat=true

  jpa:
    properties:
      hibernate:
        dialect: org.hibernate.dialect.MySQL5Dialect # stripped before adding them to the entity manager)
    database: MYSQL
    show-sql: true # 打印执行的SQL
    hibernate:
      ddl-auto: update   # Hibernate ddl auto (create, create-drop, update, validate, none)
      naming:
        implicit-strategy: org.springframework.boot.orm.jpa.hibernate.SpringImplicitNamingStrategy
      naming-strategy: org.hibernate.cfg.ImprovedNamingStrategy
      #使用JPA作为持久层框架与MYSQL整合---end---------------------

编写Druid（alibaba数据库连接池）初始化配置:

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package org.jd.websocket.auth.data.reactor.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;

import javax.sql.DataSource;
import java.sql.SQLException;

/**
 * Jpa与Druid线程池整合作为持久层
 */
@Configuration
public class JpaDruidConfig {
    @Value("${spring.datasource.url}")
    private String dbUrl;

    @Value("${spring.datasource.username}")
    private String username;
    @Value("${spring.datasource.password}")
    private String password;
    @Value("${spring.datasource.driver-class-name}")
    private String driverClassName;

    @Value("${spring.datasource.initialSize}")
    private int initialSize;
    @Value("${spring.datasource.minIdle}")
    private int minIdle;
    @Value("${spring.datasource.maxActive}")
    private int maxActive;
    @Value("${spring.datasource.maxWait}")
    private int maxWait;
    @Value("${spring.datasource.timeBetweenEvictionRunsMillis}")
    private int timeBetweenEvictionRunsMillis;
    @Value("${spring.datasource.minEvictableIdleTimeMillis}")
    private int minEvictableIdleTimeMillis;
    @Value("${spring.datasource.validationQuery}")
    private String validationQuery;
    @Value("${spring.datasource.testWhileIdle}")
    private boolean testWhileIdle;
    @Value("${spring.datasource.testOnBorrow}")
    private boolean testOnBorrow;
    @Value("${spring.datasource.testOnReturn}")
    private boolean testOnReturn;
    @Value("${spring.datasource.poolPreparedStatements}")
    private boolean poolPreparedStatements;
    @Value("${spring.datasource.maxPoolPreparedStatementPerConnectionSize}")
    private int maxPoolPreparedStatementPerConnectionSize;
    @Value("${spring.datasource.filters}")
    private String filters;
    @Value("{spring.datasource.connectionProperties}")
    private String connectionProperties;

    @Bean
    @Primary
    public DataSource dataSource() {

        DruidDataSource datasource = new DruidDataSource();
        datasource.setUrl(dbUrl);
        datasource.setUsername(username);
        datasource.setPassword(password);
        datasource.setDriverClassName(driverClassName);
        //configuration
        datasource.setInitialSize(initialSize);
        datasource.setMinIdle(minIdle);
        datasource.setMaxActive(maxActive);
        datasource.setMaxWait(maxWait);
        datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
        datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
        datasource.setValidationQuery(validationQuery);
        datasource.setTestWhileIdle(testWhileIdle);
        datasource.setTestOnBorrow(testOnBorrow);
        datasource.setTestOnReturn(testOnReturn);
        datasource.setPoolPreparedStatements(poolPreparedStatements);
        datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);
        try {
            datasource.setFilters(filters);
        } catch (SQLException e) {
            System.err.println("druid configuration initialization filter: " + e);
        }
        datasource.setConnectionProperties(connectionProperties);
        return datasource;
    }

    @Bean
    public ServletRegistrationBean statViewServlet() {
        System.out.print("init Druid Monitor Servlet ...");
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
        servletRegistrationBean.addInitParameter("allow", "127.0.0.1");
        // IP黑名单(共同存在时，deny优先于allow)
        servletRegistrationBean.addInitParameter("deny", "192.168.1.100");
        //控制台管理用户
        servletRegistrationBean.addInitParameter("loginUsername", "admin");
        servletRegistrationBean.addInitParameter("loginPassword", "123456");
        servletRegistrationBean.addInitParameter("resetEnable", "false");
        System.out.print("注册成功");
        return servletRegistrationBean;
    }

    @Bean
    public FilterRegistrationBean startFilter() {


        FilterRegistrationBean filterRegistrationBean =
                new FilterRegistrationBean(new WebStatFilter());
        filterRegistrationBean.addUrlPatterns("/*");
        //忽略过滤的格式
        filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
        return filterRegistrationBean;
    }

}

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启动报错:

init Druid Monitor Servlet ...注册成功2023-08-10 21:03:14.026  INFO 10256 --- [  restartedMain] c.github.jasync.sql.db.util.NettyUtils   : jasync selected transport - nio
2023-08-10 21:03:14.221  WARN 10256 --- [  restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaConfiguration': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/jd/websocket/auth/data/reactor/config/JpaDruidConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [javax.sql.DataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.NoClassDefFoundError: org/apache/log4j/Logger
2023-08-10 21:03:14.233  INFO 10256 --- [  restartedMain] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2023-08-10 21:03:14.271  INFO 10256 --- [  restartedMain] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2023-08-10 21:03:14.331 ERROR 10256 --- [  restartedMain] o.s.boot.SpringApplication               : Application run failed

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/jd/websocket/auth/data/reactor/config/JpaDruidConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [javax.sql.DataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.NoClassDefFoundError: org/apache/log4j/Logger

    ... 33 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [javax.sql.DataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.NoClassDefFoundError: org/apache/log4j/Logger
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.3.17.jar:5.3.17]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) ~[spring-beans-5.3.17.jar:5.3.17]
    ... 47 common frames omitted
Caused by: java.lang.NoClassDefFoundError: org/apache/log4j/Logger
    at com.alibaba.druid.filter.logging.Log4jFilter.(Log4jFilter.java:25) ~[druid-1.2.16.jar:na]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_221]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_221]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_221]
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_221]

 java.lang.NoClassDefFoundError: org/apache/log4j/Logger 报错最终信息

 问题一: 缺少,Druid初始化化依赖 org/apache/log4j/Logger；但是不应该呀,Spring-Boot不是已经添加了该依赖吗,百思不得其解....于是翻下相应包是否依赖，如下图,都没引入该包的依赖....

 引入Logger三角坐标:

---

    log4j
    log4j
    1.2.17

再次启动项目: 可以正常启动但是有个警告:

log4j:WARN No appenders could be found for logger (druid.sql.Connection).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

 很明显druid启动过程会加载日志配置文件. 在resources目录下面新建"log4j.properties"文件,内容如下,启动就正常了；

log4j.appender.FILE = org.apache.log4j.FileAppender 
log4j.appender.FILE.File = file.log 
log4j.appender.FILE.Append = false 
log4j.appender.FILE.layout = org.apache.log4j.PatternLayout 
log4j.appender.FILE.layout.ConversionPattern = [framework] % d - % c -%- 4r [ % t] %- 5p % c % x - % m % n