我看了here、here、here 这里没有解决我的问题是我得到的错误：
2021-01-17 18:49:19.469 WARN 22952 --- [main] o.h.e.j.e.i.JdbcEnvironmentInitiator
: HHH000342: Could not obtain connection to query metadata
org.postgresql.util.PSQLException: The connection attempt failed.
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:315) ~[postgresql-42.2.18.jar:42.2.18]
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:51) ~[postgresql-42.2.18.jar:42.2.18]
at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:225) ~[postgresql-42.2.18.jar:42.2.18]
at org.postgresql.Driver.makeConnection(Driver.java:465) ~[postgresql-42.2.18.jar:42.2.18]
at org.postgresql.Driver.connect(Driver.java:264) ~[postgresql-42.2.18.jar:42.2.18]
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:121) ~[HikariCP-3.4.5.jar:na]
at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:358) ~[HikariCP-3.4.5.jar:na]
at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:206) ~[HikariCP-3.4.5.jar:na]
at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:477) ~[HikariCP-3.4.5.jar:na]
at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:560) ~[HikariCP-3.4.5.jar:na]
at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:115) ~[HikariCP-3.4.5.jar:na]
at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112) ~[HikariCP-3.4.5.jar:na]
at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcEnvironmentInitiator.java:180) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:68) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:101) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:263) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:237) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.injectServices(DefaultIdentifierGeneratorFactory.java:152) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.service.internal.AbstractServiceRegistryImpl.injectDependencies(AbstractServiceRegistryImpl.java:286) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:243) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.<init>(InFlightMetadataCollectorImpl.java:176) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:127) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:1224) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1255) ~[hibernate-core-5.4.27.Final.jar:5.4.27.Final]
at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:58) ~[spring-orm-5.3.3.jar:5.3.3]
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) ~[spring-orm-5.3.3.jar:5.3.3]
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:409) ~[spring-orm-5.3.3.jar:5.3.3]
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:396) ~[spring-orm-5.3.3.jar:5.3.3]
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) ~[spring-orm-5.3.3.jar:5.3.3]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1847) ~[spring-beans-5.3.3.jar:5.3.3]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1784) ~[spring-beans-5.3.3.jar:5.3.3]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:609) ~[spring-beans-5.3.3.jar:5.3.3]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:531) ~[spring-beans-5.3.3.jar:5.3.3]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.3.jar:5.3.3]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.3.jar:5.3.3]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.3.jar:5.3.3]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.3.jar:5.3.3]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1159) ~[spring-context-5.3.3.jar:5.3.3]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913) ~[spring-context-5.3.3.jar:5.3.3]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:588) ~[spring-context-5.3.3.jar:5.3.3]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144) ~[spring-boot-2.4.2.jar:2.4.2]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:767) ~[spring-boot-2.4.2.jar:2.4.2]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) ~[spring-boot-2.4.2.jar:2.4.2]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426) ~[spring-boot-2.4.2.jar:2.4.2]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:326) ~[spring-boot-2.4.2.jar:2.4.2]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1311) ~[spring-boot-2.4.2.jar:2.4.2]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1300) ~[spring-boot-2.4.2.jar:2.4.2]
at com.springboot.project1.Project1Application.main(Project1Application.java:11) ~[classes/:na]
Caused by: java.net.UnknownHostException: bvkgnbxlgupmon:c802e8c6e31976c1ce11584fec0961bc604bce0df24501a6dfd2700240c7ba3f@ec2-3-231-241-17.compute-1.amazonaws.com
at java.base/sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:567) ~[na:na]
at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:333) ~[na:na]
at java.base/java.net.Socket.connect(Socket.java:648) ~[na:na]
at org.postgresql.core.PGStream.createSocket(PGStream.java:231) ~[postgresql-42.2.18.jar:42.2.18]
at org.postgresql.core.PGStream.<init>(PGStream.java:95) ~[postgresql-42.2.18.jar:42.2.18]
at org.postgresql.core.v3.ConnectionFactoryImpl.tryConnect(ConnectionFactoryImpl.java:98) ~[postgresql-42.2.18.jar:42.2.18]
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:213) ~[postgresql-42.2.18.jar:42.2.18]
... 51 common frames omitted
应用程序.属性：
spring.datasource.url=jdbc:postgresql://ec2-3-231-241-17.compute-1.amazonaws.com:5432/d8pv6nkjjc58qb?ssl=true&sslfactory=org.postgresql.ssl.NonValidatingFactory
spring.datasource.username=beggnbxlgupmon
spring.datasource.password=c3402e8c6e31976c1ce11584gec0961dc604bce0df24501a6dfd2700240c7ba3f
spring.datasource.name=d8pv6nkjjc58qb
spring.jpa.database-platform = org.hibernate.dialect.PostgreSQLDialect
spring.jpa.hibernate.ddl-auto = none
spring.jpa.hibernate.show-sql=true
spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation=true
SPRING_DATASOURCE_TYPE = org.apache.tomcat.jdbc.pool.DataSource
答案 0 :(得分：0)
我不知道您的数据库服务器是如何配置的。检查选项并尝试适合您情况的方式。
首先解决问题的方法是检查与服务器的连接，在您的机器上进行测试（如果可能）。
我会按照这些步骤来解决问题。
您需要安装 PostgreSQL 的 psql 客户端。尝试更新版本，这使您可以连接到新旧版本 如果你没有时间安装 Postgres，你可以使用 Docker 镜像 只有 psql 客户端 https://hub.docker.com/r/jbergknoff/postgresql-client/
如果您有 psql 客户端，请尝试连接。
./psql -U beggnbxlgupmon -h ec2-3-231-241-17.compute-1.amazonaws.com
Password for user beggnbxlgupmon:
**psql: FATAL: password authentication failed for user "beggnbxlgupmon"
FATAL: no pg_hba.conf entry for host "x.x.xx.xx"**, user "beggnbxlgupmon", database "beggnbxlgupmon", SSL off
可以看出，您的 DBA 已配置 IP 限制。也许您的 DBA 只允许特定 IP 范围的连接。
确保您的应用程序所在的 IP 或 IP 范围允许连接到数据库服务器。
在pg_hba.conf中添加SpringBoot应用的IP地址，并确保方法没有设置为reject。需要修改xxx.xxx.xxx.xxx并将IP地址设置为允许连接。
更新
安全组是您 AWS EC2 实例中的防火墙。 EC2 实例位于 AWS 中。您的数据库服务器在 EC2 上。您的实例位于通过 Heroku 创建的 AWS 中。
此外，如有必要，添加规则以允许防火墙/安全组中的 5432 端口进入范围 IP 或特定 IP。 也许这有助于https://serverfault.com/questions/211244/allow-ports-on-ec2-only-for-heroku
某些环境不允许出站连接到 Internet。为了丢弃客户端中的问题。验证应用程序是否可以访问外部世界。