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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Jpa与Druid线程池及Spring Boot整合(一)

Jpa与Druid线程池及Spring Boot整合(二)：几个坑

附录官网文档：core.domain-events域事件

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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:

<!--设置spring-boot依赖的版本 -->
<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.6.5</version> <!--2.4.11--><relativePath/>
</parent>

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<properties><lombok.version>1.18.22</lombok.version><hutool-all.version>5.8.18</hutool-all.version><druid.version>1.2.16</druid.version><mysql-connector-java.version>8.0.28</mysql-connector-java.version></properties>

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<dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>${lombok.version}</version><scope>provided</scope>
</dependency>
<dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>${hutool-all.version}</version>
</dependency><!--连接mysql数据库的驱动 -->
<dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>${mysql-connector-java.version}</version>
</dependency><!--阿里巴巴开源的线程池连接框架-->
<dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>${druid.version}</version>
</dependency>

<!-- spring-boot与jpa整合-->
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- 端点监控的配置-->
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency><groupId>org.springframework.hateoas</groupId><artifactId>spring-hateoas</artifactId>
</dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId><optional>true</optional>
</dependency>

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(二) application.yml配置文件

server:port: 9999servlet: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=falseusername: rootpassword: 123456driverClassName: 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: 5minIdle: 5maxActive: 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: 300000validationQuery: SELECT 1 FROM DUALtestWhileIdle: truetestOnBorrow: falsetestOnReturn: false# 打开PSCache，并且指定每个连接上PSCache的大小poolPreparedStatements: truemaxPoolPreparedStatementPerConnectionSize: 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=truejpa:properties:hibernate:dialect: org.hibernate.dialect.MySQL5Dialect # stripped before adding them to the entity manager)database: MYSQLshow-sql: true # 打印执行的SQLhibernate:ddl-auto: update   # Hibernate ddl auto (create, create-drop, update, validate, none)naming:implicit-strategy: org.springframework.boot.orm.jpa.hibernate.SpringImplicitNamingStrategynaming-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.autoconfigure.domain.EntityScan;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.*;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;import javax.persistence.EntityManagerFactory;
import javax.sql.DataSource;
import java.sql.SQLException;/*** @Transactiona在多数据源下失效* 在多数据源的情况下，如果transactionManager进行了分开配置，比如这里针对三个数据源配置了三个transactionManager* ===========================================================================================================* @Bean("formTransactionManager")* public PlatformTransactionManager transactionManager(EntityManagerFactoryBuilder builder) {*     return new JpaTransactionManager(Objects.requireNonNull(entityManagerFactory(builder).getObject()));* }*=============================================================================================================* @Bean("fileTransactionManager")* public PlatformTransactionManager transactionManager(EntityManagerFactoryBuilder builder) {*     return new JpaTransactionManager(Objects.requireNonNull(entityManagerFactory(builder).getObject()));* }* ============================================================================================================* @Primary* @Bean("userTransactionManager")* public PlatformTransactionManager transactionManager(EntityManagerFactoryBuilder builder) {*     return new JpaTransactionManager(Objects.requireNonNull(entityManagerFactory(builder).getObject()));* }* =============================================================================================================** 那么在使用@Transactional的时候需要指定transactionManager* @Transactional("formTransactionManager")******* Jpa与Druid线程池整合作为持久层*/
@Configuration
@EntityScan(basePackages = "org.jd.websocket.auth.data.reactor.jpa")
@EnableTransactionManagement // 开启事务的支持
@EnableJpaRepositories(basePackages = {"org.jd.websocket.auth.data.reactor.repository","org.jd.websocket.auth.data.reactor.jpa"},includeFilters = {@ComponentScan.Filter(type = FilterType.REGEX, pattern = ".*CrudRepository")},excludeFilters = {@ComponentScan.Filter(type = FilterType.REGEX, pattern = ".*SomeOtherRepository")})
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@Primarypublic DataSource dataSource() {DruidDataSource datasource = new DruidDataSource();datasource.setUrl(dbUrl);datasource.setUsername(username);datasource.setPassword(password);datasource.setDriverClassName(driverClassName);// configurationdatasource.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;}@Beanpublic LocalContainerEntityManagerFactoryBean entityManagerFactory() {HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();vendorAdapter.setGenerateDdl(true);LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();factory.setJpaVendorAdapter(vendorAdapter);// entity扫描的包路径factory.setPackagesToScan("org.jd.websocket.auth.data.reactor.jpa");factory.setDataSource(dataSource());return factory;}   /**** @param entityManagerFactory* @return*/@Primary@Bean(name = "userJpaTransactionManager")public PlatformTransactionManager transactionManager(EntityManagerFactory entityManagerFactory) {JpaTransactionManager txManager = new JpaTransactionManager();txManager.setEntityManagerFactory(entityManagerFactory);return txManager;}@Beanpublic 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;}@Beanpublic 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.<init>(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:

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<!-- spring-boot与jpa整合,当前者版本依赖这个,需要加上,否则启动不了-->
<dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.17</version>
</dependency>

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.rootLogger=INFO,toFile,toConsole  
########   输出到到文件   ##########
log4j.appender.toFile=org.apache.log4j.FileAppender  
log4j.appender.toFile.layout=org.apache.log4j.PatternLayout  
log4j.appender.toFile.file=test.log  
########  输出到到控制台  ##########
log4j.appender.toConsole=org.apache.log4j.ConsoleAppender  
log4j.appender.toConsole.layout=org.apache.log4j.PatternLayout