SpringBoot 报错：ERROR 10224 --- [ restartedMain] o.a.tomcat.jdbc.pool.ConnectionPool 已解决

SpringBoot 报错：ERROR 10224 — [ restartedMain] o.a.tomcat.jdbc.pool.ConnectionPool : Unable to create initial connections of pool. 解决方案

文章目录

eclipse报错
主要问题代码
解决思路
修改为正确代码

eclipse报错

2020-01-30 12:49:04.620 INFO 10224 — [ restartedMain] com.how2java.springboot.Application : Starting Application on LAPTOP-LELBA6ER with PID 10224 (E:\sprbt\springboot_h2j4\target\classes started by int in E:\sprbt\springboot_h2j4)
2020-01-30 12:49:04.620 INFO 10224 — [ restartedMain] com.how2java.springboot.Application : No active profile set, falling back to default profiles: default
2020-01-30 12:49:04.664 INFO 10224 — [ restartedMain] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@3c63065c: startup date [Thu Jan 30 12:49:04 CST 2020]; root of context hierarchy
2020-01-30 12:49:05.698 INFO 10224 — [ restartedMain] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2020-01-30 12:49:05.704 INFO 10224 — [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-01-30 12:49:05.705 INFO 10224 — [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.23
2020-01-30 12:49:05.852 INFO 10224 — [ost-startStop-1] org.apache.jasper.servlet.TldScanner : At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
2020-01-30 12:49:05.856 INFO 10224 — [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-01-30 12:49:05.856 INFO 10224 — [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1194 ms
2020-01-30 12:49:05.965 INFO 10224 — [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: ‘dispatcherServlet’ to [/]
2020-01-30 12:49:05.968 INFO 10224 — [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: ‘characterEncodingFilter’ to: [/]
2020-01-30 12:49:05.968 INFO 10224 — [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: ‘hiddenHttpMethodFilter’ to: [/]
2020-01-30 12:49:05.968 INFO 10224 — [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: ‘httpPutFormContentFilter’ to: [/]
2020-01-30 12:49:05.968 INFO 10224 — [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: ‘requestContextFilter’ to: [/]
2020-01-30 12:49:06.359 ERROR 10224 — [ restartedMain] o.a.tomcat.jdbc.pool.ConnectionPool : Unable to create initial connections of pool.

java.sql.SQLException: java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.lang.Long
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1074) ~[mysql-connector-java-5.1.21.jar:na]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:988) ~[mysql-connector-java-5.1.21.jar:na]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:974) ~[mysql-connector-java-5.1.21.jar:na]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:919) ~[mysql-connector-java-5.1.21.jar:na]
at com.mysql.jdbc.ConnectionImpl.buildCollationMapping(ConnectionImpl.java:1041) ~[mysql-connector-java-5.1.21.jar:na]
at com.mysql.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3481) ~[mysql-connector-java-5.1.21.jar:na]
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2445) ~[mysql-connector-java-5.1.21.jar:na]
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2215) ~[mysql-connector-java-5.1.21.jar:na]

主要问题代码

application.properties ↓

spring.mvc.view.prefix=/WEB-INF/jsp/
spring.mvc.view.suffix=.jsp
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/how2java?characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=admin
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.properties.hibernate.hbm2ddl.auto=update

pom.xml ↓

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
 
  <groupId>com.how2java</groupId>
  <artifactId>springboot</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>springboot</name>
  <description>springboot</description>
  <packaging>war</packaging>
   
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
    </parent>
 
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
             
        </dependency>
        <dependency>
              <groupId>junit</groupId>
              <artifactId>junit</artifactId>
              <version>3.8.1</version>
              <scope>test</scope>
        </dependency>
        <!-- servlet依赖. -->
        <dependency>
              <groupId>javax.servlet</groupId>
              <artifactId>javax.servlet-api</artifactId>
               
        </dependency>
              <dependency>
                     <groupId>javax.servlet</groupId>
                     <artifactId>jstl</artifactId>
              </dependency>
        <!-- tomcat的支持.-->
        <dependency>
               <groupId>org.apache.tomcat.embed</groupId>
               <artifactId>tomcat-embed-jasper</artifactId>
                
        </dependency>    
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional> <!-- 这个需要为 true 热部署才有效 -->
        </dependency>
         
        <!-- mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.21</version>
        </dependency>
 
        <!-- jpa-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>       
    </dependencies>
 
    <properties>
        <java.version>1.8</java.version>
    </properties>
 
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
 
</project>

解决思路

注意到报错代码中的加粗字体：
ConnectionPool : Unable to create initial connections of pool. //不能初始化连接池连接；
java.sql.SQLException: java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.lang.Long // sql中BigInteger 不能强制转换位Long，可能存在sql兼容问题

我们可以把问题定位到mysql的配置或者版本上的问题；检查application.properties 中mysql连接配置没有问题。
检查pom.xml 中mysql jar版本为5.1.21。而本地服务器mysql版本为8.0.18。修改pom.xml的mysql jar包版本为本地mysql版本8.0.18。
mysql8.0以上版本datasource.url需加上serverTimezone属性；

修改为正确代码

pom.xml ↓

        <!-- mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.18</version>
        </dependency>

application.properties ↓

spring.mvc.view.prefix=/WEB-INF/jsp/
spring.mvc.view.suffix=.jsp
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/how2java?characterEncoding=UTF-8&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=admin
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.jpa.properties.hibernate.hbm2ddl.auto=update

修改以上代码后，springboot应用再jdk8环境下正常打开。

来源：CSDN

作者：retnull

链接：https://blog.csdn.net/qq_43018046/article/details/104114730

标签

mysql

jdbc

info