因此，我已经配置了我的spring boot应用程序来处理多个数据源，一切都很好，但是我注意到，当我启动该应用程序时，仅在需要时启动主数据源的池，而不启动其他数据池（有时会在nullpointer中...）
2020-03-05 15:34:02.478 INFO 11172 --- [ main] be.MyApp.ESPI.EspiApplication :
Starting EspiApplication on BESVC-HQ2000928 with PID 11172 (C:\Users\...\Documents\MyApp\Others\ESPI\ESPI\target\classes started by ... in C:\Users\...\Documents\MyApp\Others\ESPI\ESPI)
2020-03-05 15:34:02.483 INFO 11172 --- [ main] be.MyApp.ESPI.EspiApplication : The following profiles are active: dev
2020-03-05 15:34:03.149 INFO 11172 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
2020-03-05 15:34:03.233 INFO 11172 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 65ms. Found 2 JPA repository interfaces.
2020-03-05 15:34:03.811 INFO 11172 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-03-05 15:34:04.433 INFO 11172 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-03-05 15:34:04.444 INFO 11172 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-03-05 15:34:04.444 INFO 11172 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.30]
2020-03-05 15:34:04.603 INFO 11172 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-03-05 15:34:04.603 INFO 11172 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2047 ms
2020-03-05 15:34:04.761 WARN 11172 --- [ main] com.zaxxer.hikari.HikariConfig : FirstPool - maxLifetime is less than 30000ms, setting to default 1800000ms.
2020-03-05 15:34:04.761 INFO 11172 --- [ main] com.zaxxer.hikari.HikariDataSource : FirstPool - Starting...
2020-03-05 15:34:05.095 INFO 11172 --- [ main] com.zaxxer.hikari.pool.PoolBase : FirstPool - Driver does not support get/set network timeout for connections. (oracle.jdbc.driver.T4CConnection.getNetworkTimeout()I)
2020-03-05 15:34:05.099 INFO 11172 --- [ main] com.zaxxer.hikari.HikariDataSource : FirstPool - Start completed.
2020-03-05 15:34:05.159 INFO 11172 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [name: default]
2020-03-05 15:34:05.243 INFO 11172 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {5.4.10.Final}
2020-03-05 15:34:05.414 INFO 11172 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.1.0.Final}
2020-03-05 15:34:05.554 INFO 11172 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.Oracle12cDialect
2020-03-05 15:34:06.519 INFO 11172 --- [ main] o.h.e.t.j.p.i.JtaPlatformInitiator : HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]
2020-03-05 15:34:06.526 INFO 11172 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2020-03-05 15:34:06.853 WARN 11172 --- [ main] JpaBaseConfiguration$JpaWebConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2020-03-05 15:34:06.947 INFO 11172 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2020-03-05 15:34:07.115 INFO 11172 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2020-03-05 15:34:07.116 INFO 11172 --- [ main] be.myapp.ESPI.EspiApplication : Started EspiApplication in 5.135 seconds (JVM running for 5.744)
2020-03-05 15:34:17.044 INFO 11172 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2020-03-05 15:34:17.044 INFO 11172 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2020-03-05 15:34:17.052 INFO 11172 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 8 ms
2020-03-05 15:34:17.087 WARN 11172 --- [nio-8080-exec-1] com.zaxxer.hikari.HikariConfig : SecondPool- maxLifetime is less than 30000ms, setting to default 1800000ms.
2020-03-05 15:34:17.087 INFO 11172 --- [nio-8080-exec-1] com.zaxxer.hikari.HikariDataSource : SecondPool- Starting...
2020-03-05 15:34:17.176 INFO 11172 --- [nio-8080-exec-1] com.zaxxer.hikari.pool.PoolBase : SecondPool- Driver does not support get/set network timeout for connections. (oracle.jdbc.driver.T4CConnection.getNetworkTimeout()I)
2020-03-05 15:34:17.178 INFO 11172 --- [nio-8080-exec-1] com.zaxxer.hikari.HikariDataSource : SecondPool- Start completed.
您可以看到FirstPool已启动。 Spring应用程序启动。然后，仅在需要时才启动SecondPool ...我想知道如何在应用程序启动之前强制池启动？
编辑：我的属性文件如下：
# DataSource definitions :
first.datasource.jdbc-url=jdbc:oracle:thin:@*a host*
first.datasource.username=user1
first.datasource.password=xxxxxxxxx
first.datasource.poolName=FirstPool
first.datasource.maximumPoolSize=100
first.datasource.maxLifetime=10000
second.datasource.jdbc-url=jdbc:oracle:thin:@*another host*
second.datasource.username=user2
second.datasource.password=xxxxxxxxx
second.datasource.poolName=SecondPool
second.datasource.maximumPoolSize=100
second.datasource.maxLifetime=10000
第二部分：
# Profile definition
[email protected]@
# JPA definitions
spring.jpa.show-sql=true
spring.jpa.database=oracle
# DataSource
spring.datasource.type=com.zaxxer.hikari.HikariDataSource
spring.datasource.hikari.dataSourceClassName=oracle.jdbc.pool.OracleDataSource
spring.datasource.hikari.dataSourceProperties.implicitCachingEnabled=true
spring.datasource.hikari.dataSourceProperties.fastConnectionFailoverEnabled=true
# Oracle specifics
oracle.net.tns_admin=${ORACLE_HOME}/NETWORK/ADMIN
处理数据库配置的配置类：
@Configuration
@PropertySource({ "classpath:application.properties", "classpath:application-${spring.profiles.active}.properties"})
@Primary
public class DBConfiguration {
@Bean(name = "FirstDataSource")
@ConfigurationProperties("first.datasource")
@Primary
public HikariDataSource FirstDataSource() {
return (HikariDataSource) DataSourceBuilder.create().build();
}
@Bean(name = "SecondDataSource")
@ConfigurationProperties("second.datasource")
public HikariDataSource SecondDataSource() {
return (HikariDataSource) DataSourceBuilder.create().build();
}
@Bean(name="FirstTM")
@Autowired
@Primary
DataSourceTransactionManager FirstTM(@Qualifier ("FirstDataSource") DataSource datasource) {
DataSourceTransactionManager txm = new DataSourceTransactionManager(datasource);
return txm;
}
@Bean(name="SecondTM")
@Autowired
DataSourceTransactionManager SecondTM(@Qualifier("SecondDataSource") DataSource datasource) {
DataSourceTransactionManager txm = new DataSourceTransactionManager(datasource);
return txm;
}
}
我找到了答案。
因此，首先，所有dataSources均已创建，但是，直到询问时才创建连接到它的池。因此，想法是在启动应用程序时强制其初始化。
可以这样实现（请参见How to configure hikari pool for eager initialization? ：：
您可以使用ApplicationLoader并在启动时获得连接：
ApplicationLoader