(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>
<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>
<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>
(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:
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; } }
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:
<!-- 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.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
