我在Docker中启动了Postgres。它工作正常。我通过bash将其放入docker容器中，并检查DB是否正常工作。 目标是将其与没有spring boot的app spring mvc连接。 如果我理解正确，则问题出在与Postgres的连接上。 该应用程序无法连接到ID。如何解决？ 该应用会生成并正确启动。获取请求的效果很好，但是当我尝试发布时却没有效果。
我尝试使用两个不同的数据源： 如果我发帖，我会在浏览器中看到错误：
1。
@Bean
public DataSource dataSource() {
DriverManagerDataSource driver = new DriverManagerDataSource();
driver.setDriverClassName("org.postgresql.Driver");
driver.setUrl("jdbc:postgresql://localhost:6000/users");
driver.setUsername("postgres");
driver.setPassword("task1");
return driver;
}
错误是：
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
@Bean public DataSource dataSource() throws PropertyVetoException { ComboPooledDataSource driver = new ComboPooledDataSource(); driver.setDriverClass("org.postgresql.Driver"); driver.setJdbcUrl("jdbc:postgresql://localhost:6000/users"); driver.setUser("postgres"); driver.setPassword("task1"); return driver; }
启动应用程序时，我在控制台中看到此错误：
17-Apr-2020 19:26:58.016 WARNING [C3P0PooledConnectionPoolManager[identityToken->z8kfsxa912030ejmgd6af|6144d891]-HelperThread-#2] com.mchange.v2.resourcepool.BasicResourcePool. Having failed to acquire a resource, com.mchange.v2.resourcepool.BasicResourcePool@46e95772 is interrupting all Threads waiting on a resource to check out. Will try again in response to new client requests.
17-Apr-2020 19:26:58.011 WARNING [C3P0PooledConnectionPoolManager[identityToken->z8kfsxa912030ejmgd6af|6144d891]-HelperThread-#1] com.mchange.v2.resourcepool.BasicResourcePool. com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@628b9aa1 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception:
org.postgresql.util.PSQLException: The connection attempt failed.
标准Docker文件：
FROM postgres
ENV POSTGRES_USER task1
ENV POSTGRES_PASSWORD task1
ENV POSTGRES_DB users
和docker-compose：
version: "3.7"
services:
postgres:
build:
context: .
dockerfile: db.Dockerfile
image: postgrei
container_name: DB
ports:
- 6000:6000
其他代码：
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories("com.repository")
@ComponentScan(basePackages = "com.task1")
public class DataJpaConfig {
@Bean
public DataSource dataSource() throws PropertyVetoException {
ComboPooledDataSource driver = new ComboPooledDataSource();
driver.setDriverClass("org.postgresql.Driver");
driver.setJdbcUrl("jdbc:postgresql://localhost:6000/users");
driver.setUser("postgres");
driver.setPassword("task1");
return driver;
}
@Bean
public PlatformTransactionManager transactionManager(final EntityManagerFactory emf) {
final JpaTransactionManager transactionManager = new JpaTransactionManager();
transactionManager.setEntityManagerFactory(emf);
return transactionManager;
}
@Bean
public JpaVendorAdapter jpaVendorAdapter() {
return new HibernateJpaVendorAdapter();
}
@Bean
public Properties hibernateProperties() {
Properties hibernateProp = new Properties();
hibernateProp.put("hibernate.dialect",
"org.hibernate.dialect.PostgreSQL95Dialect");
hibernateProp.put("hibernate.format sql", true);
hibernateProp.put("hibernate.use sql comments", true);
hibernateProp.put("hibernate.show_sql", true);
hibernateProp.put("hibernate.max_fetch_depth", 3);
hibernateProp.put("hibernate.jdbc.batch_size", 10);
hibernateProp.put("hibernate.jdbc.fetch_size", 50);
return hibernateProp;
}
@Bean
public EntityManagerFactory entityManagerFactory() {
LocalContainerEntityManagerFactoryBean factoryBean =
new LocalContainerEntityManagerFactoryBean();
factoryBean.setPackagesToScan(
"com.task1");
try {
factoryBean.setDataSource(dataSource());
} catch (PropertyVetoException e) {
e.printStackTrace();
}
factoryBean.setJpaVendorAdapter(
new HibernateJpaVendorAdapter());
factoryBean.setJpaProperties(hibernateProperties());
factoryBean.setJpaVendorAdapter(jpaVendorAdapter());
factoryBean.afterPropertiesSet();
return factoryBean.getNativeEntityManagerFactory();
}
}
public class ApplicationInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class[]{DataJpaConfig.class};
}
@Override
protected Class<?>[] getServletConfigClasses() {
return new Class[]{ApplicationConfiguration.class};
}
@Override
protected String[] getServletMappings() {
return new String[]{"/"};
}
}
@Configuration
@EnableWebMvc
@EnableTransactionManagement
@ComponentScan(basePackages = "com.task1")
public class ApplicationConfiguration implements WebMvcConfigurer {}
来自docker容器的日志：
The files belonging to this database system will be owned by user "postgres".
This user must also own the server process.
The database cluster will be initialized with locale "en_US.utf8".
The default database encoding has accordingly been set to "UTF8".
The default text search configuration will be set to "english".
Data page checksums are disabled.
fixing permissions on existing directory /var/lib/postgresql/data ... ok
creating subdirectories ... ok
selecting dynamic shared memory implementation ... posix
selecting default max_connections ... 100
selecting default shared_buffers ... 128MB
selecting default time zone ... Etc/UTC
creating configuration files ... ok
running bootstrap script ... ok
performing post-bootstrap initialization ... ok
syncing data to disk ... ok
Success. You can now start the database server using:
pg_ctl -D /var/lib/postgresql/data -l logfile start
initdb: warning: enabling "trust" authentication for local connections
You can change this by editing pg_hba.conf or using the option -A, or
--auth-local and --auth-host, the next time you run initdb.
waiting for server to start....2020-04-17 16:17:52.683 UTC [47] LOG: starting PostgreSQL 12.2 (Debian 12.2-2.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
2020-04-17 16:17:52.684 UTC [47] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2020-04-17 16:17:52.698 UTC [48] LOG: database system was shut down at 2020-04-17 16:17:50 UTC
2020-04-17 16:17:52.702 UTC [47] LOG: database system is ready to accept connections
done
server started
CREATE DATABASE
/usr/local/bin/docker-entrypoint.sh: running /docker-entrypoint-initdb.d/createUserTable.sql
CREATE TABLE
/usr/local/bin/docker-entrypoint.sh: running /docker-entrypoint-initdb.d/putDataToUserTable.sql
INSERT 0 3
waiting for server to shut down...2020-04-17 16:17:53.317 UTC [47] LOG: received fast shutdown request
.2020-04-17 16:17:53.332 UTC [47] LOG: aborting any active transactions
2020-04-17 16:17:53.335 UTC [47] LOG: background worker "logical replication launcher" (PID 54) exited with exit code 1
2020-04-17 16:17:53.335 UTC [49] LOG: shutting down
2020-04-17 16:17:53.407 UTC [47] LOG: database system is shut down
done
server stopped
PostgreSQL init process complete; ready for start up.
2020-04-17 16:17:53.431 UTC [1] LOG: starting PostgreSQL 12.2 (Debian 12.2-2.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
2020-04-17 16:17:53.432 UTC [1] LOG: listening on IPv4 address "0.0.0.0", port 5432
2020-04-17 16:17:53.432 UTC [1] LOG: listening on IPv6 address "::", port 5432
2020-04-17 16:17:53.441 UTC [1] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2020-04-17 16:17:53.454 UTC [83] LOG: database system was shut down at 2020-04-17 16:17:53 UTC
2020-04-17 16:17:53.458 UTC [1] LOG: database system is ready to accept connections
答案 0 :(得分：1)
问题出在您的docker-compose.yml文件中。
您需要映射数据库端口。
将端口从6000:6000更改为6000:5432，然后将docker-compose down和docker-compose up更改。