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一个简单jar包丢远程服务器后执行‘java -jar proj.jar’后一直报错（链接？）...

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[待解决问题] 
2023-07-30 13:32:11.139 ERROR 25274 --- [           main] com.zaxxer.hikari.pool.HikariPool        : HikariPool-1 - Exception during pool initialization.

com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
    at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
    at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:835) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
    at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:455) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
    at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:240) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
    at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:199) ~[mysql-connector-java-8.0.15.jar!/:8.0.15]
    at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:138) ~[HikariCP-4.0.3.jar!/:na]
    at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:364) ~[HikariCP-4.0.3.jar!/:na]
    at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:206) ~[HikariCP-4.0.3.jar!/:na]
    at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:476) [HikariCP-4.0.3.jar!/:na]
    at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:561) [HikariCP-4.0.3.jar!/:na]
    at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:115) [HikariCP-4.0.3.jar!/:na]
    at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112) [HikariCP-4.0.3.jar!/:na]
    at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122) [hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcEnvironmentInitiator.java:181) [hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:68) [hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35) [hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
    at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:101) [hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:272) [hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:246) [hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:223) [hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
    at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.injectServices(DefaultIdentifierGeneratorFactory.java:175) [hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.injectDependencies(AbstractServiceRegistryImpl.java:295) [hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:252) [hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:223) [hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
    at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.<init>(InFlightMetadataCollectorImpl.java:173) [hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:127) [hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:1460) [hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1494) [hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
    at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:58) [spring-orm-5.3.27.jar!/:5.3.27]
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) [spring-orm-5.3.27.jar!/:5.3.27]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:409) [spring-orm-5.3.27.jar!/:5.3.27]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:396) [spring-orm-5.3.27.jar!/:5.3.27]
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) [spring-orm-5.3.27.jar!/:5.3.27]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1863) [spring-beans-5.3.27.jar!/:5.3.27]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1800) [spring-beans-5.3.27.jar!/:5.3.27]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:620) [spring-beans-5.3.27.jar!/:5.3.27]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) [spring-beans-5.3.27.jar!/:5.3.27]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) [spring-beans-5.3.27.jar!/:5.3.27]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.27.jar!/:5.3.27]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) [spring-beans-5.3.27.jar!/:5.3.27]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) [spring-beans-5.3.27.jar!/:5.3.27]
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1156) ~[spring-context-5.3.27.jar!/:5.3.27]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:910) ~[spring-context-5.3.27.jar!/:5.3.27]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.27.jar!/:5.3.27]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147) ~[spring-boot-2.7.12.jar!/:2.7.12]

 

 

 

现在想用个最简单jar文件试试。。

问题补充：

一些背景：

我远程有mysql5.7, jdk1.8，tomcat, 

本地新建远程的数据库表，查询，插入，连接都OK，

完了，打包个jar丢远程后， 运行Java -jar, 就是如上报错信息。
Coca-code的主页 Coca-code | 初学一级 | 园豆：10
提问于：2023-07-30 13:51
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所有回答(4)
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根据报错信息显示，问题出现在与 MySQL 数据库的通信过程中。具体错误是 "Communications link failure"，意味着无法建立到数据库服务器的连接。

这可能是由于以下几个原因引起的：

  1. 数据库服务器地址或端口错误：请确保在连接数据库时提供了正确的数据库服务器地址和端口号。

  2. 数据库服务器未运行：请确保数据库服务器已经启动，并且可以通过远程服务器访问。

  3. 防火墙或网络配置限制：请检查防火墙或网络配置，确保允许远程服务器连接到数据库服务器的地址和端口。

  4. 数据库访问凭据错误：请确认在连接数据库时提供了正确的用户名和密码，并且该用户具有足够的权限来访问数据库。

  5. 缺少必要的数据库驱动程序：根据报错信息推测，你使用的是 MySQL 数据库，所以请确保在项目中包含了正确的 MySQL 驱动程序（例如 mysql-connector-java）。可以检查一下是否已经将 mysql-connector-java-8.0.15.jar 包含在你的项目中。如果没有，可以从 MySQL 官网下载并添加到你的项目中。

解决此问题的方法可能因具体情况而异，但以上列出的几个原因是最常见的。你可以根据这些提示尝试解决问题。

lanedm | 园豆：2381 (老鸟四级) | 2023-07-30 21:07

感谢关注，工作忙，才打开电脑...

你提供的帮助条目会去逐条确认，

我补充了问题的一些背景。

支持(0) 反对(0) Coca-code | 园豆：10 (初学一级) | 2023-08-31 15:21
0

连不上数据库

ycyzharry | 园豆：25653 (高人七级) | 2023-07-30 22:52
0

这不很明显？在服务器上测一下db

人间春风意 | 园豆：2368 (老鸟四级) | 2023-07-31 08:19
0

telnet一下数据库服务器，感觉不通

墨竹丶蝉翼 | 园豆：223 (菜鸟二级) | 2023-08-03 15:31
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