我已经在Eclipse中使用Spring Boot和REST API创建了一个webapp。当我尝试使用Tomcat 8运行它时，出现错误 “ o.a.tomcat.jdbc.pool.ConnectionPool：无法创建池的初始连接。”
我尝试使用提供的解决方案，但似乎无济于事，它总是产生相同的错误。
这是我的application.properties文件-
spring.datasource.url = jdbc:mysql://localhost:3306/dbase?autoReconnect=true&useSSL=false
spring.datasource.username = 1234
spring.datasource.password = 1234
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
spring.jpa.hibernate.ddl-auto = update
这是pom.xml文件-
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.springboot</groupId>
<artifactId>springbootrestapi</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>springbootrestapiexample Maven Webapp</name>
<url>http://maven.apache.org</url>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<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>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>springbootrestapiexample</finalName>
</build>
</project>
这是堆栈跟踪-
16:33:43.182 [main] DEBUG org.springframework.boot.devtools.settings.DevToolsSettings - Included patterns for restart : []
16:33:43.206 [main] DEBUG org.springframework.boot.devtools.settings.DevToolsSettings - Excluded patterns for restart : [/spring-boot-starter/target/classes/, /spring-boot-autoconfigure/target/classes/, /spring-boot-starter-[\w-]+/, /spring-boot/target/classes/, /spring-boot-actuator/target/classes/, /spring-boot-devtools/target/classes/]
16:33:43.207 [main] DEBUG org.springframework.boot.devtools.restart.ChangeableUrls - Matching URLs for reloading : [file:/C:/Users/Amber%20Bhanarkar/eclipse-workspace/springbootrestapi/target/classes/]
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.5.4.RELEASE)
2019-05-29 16:33:43.767 INFO 13396 --- [ restartedMain] c.s.s.StudentApplication : Starting StudentApplication on LAPTOP-BV6107FE with PID 13396 (started by Amber Bhanarkar in C:\Users\Amber Bhanarkar\eclipse-workspace\springbootrestapi)
2019-05-29 16:33:43.768 INFO 13396 --- [ restartedMain] c.s.s.StudentApplication : No active profile set, falling back to default profiles: default
2019-05-29 16:33:43.892 INFO 13396 --- [ restartedMain] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@754391d8: startup date [Wed May 29 16:33:43 IST 2019]; root of context hierarchy
2019-05-29 16:33:49.463 INFO 13396 --- [ restartedMain] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2019-05-29 16:33:49.552 INFO 13396 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2019-05-29 16:33:49.554 INFO 13396 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.15
2019-05-29 16:33:50.076 INFO 13396 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2019-05-29 16:33:50.076 INFO 13396 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 6188 ms
2019-05-29 16:33:50.354 INFO 13396 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2019-05-29 16:33:50.359 INFO 13396 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2019-05-29 16:33:50.360 INFO 13396 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2019-05-29 16:33:50.360 INFO 13396 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2019-05-29 16:33:50.360 INFO 13396 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2019-05-29 16:33:55.529 ERROR 13396 --- [ restartedMain] o.a.tomcat.jdbc.pool.ConnectionPool : Unable to create initial connections of pool.
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
这是StudentApplication.java-
package com.springboot.springbootrestapi;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
@SpringBootApplication
@EnableJpaAuditing
public class StudentApplication {
public static void main(String[] args) {
SpringApplication.run(StudentApplication.class, args);
}
}
答案 0 :(得分：1)
您必须更改很少的内容
1。转到C盘中的mysql安装目录，然后找到my.ini文件。
将default_authentication_plugin更改为此
default_authentication_plugin=mysql_native_password
，然后转到您的MySQL命令行客户端， 登录后，运行以下查询：
ALTER USER'yourusername'@'localhost'由mysql_native_password标识为'yourpassword';
然后重新启动mysql服务并运行程序。
用您的MySQL实际用户名和密码替换"yourusername"和"yourpassword"。
转到POM并替换：
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
具有最新的MySQL8连接器
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.15</version>
</dependency>
我希望它会有所帮助：）
答案 1 :(得分：0)
这些是要检查的东西
Host 'xxx.xx.xxx.xxx' is not allowed to connect to this MySQL server
为什么首先要在tomcat中运行spring boot而不是一个胖子？ 其次，应将mysql客户端JAR包含在tomcat库中
如果服务器用尽了可用的连接数，则增加mySQL最大连接数