Spring Boot应用程序启动速度非常慢

Question

我有一个简单的Spring Boot应用程序,它连接到PostgreSQL数据库并充当JSON服务.不知怎的,创业公司变得非常慢,见时间10:37:10和10:38:00:

2015-05-09 10:37:09.649  INFO 20880 --- [lication.main()] o.apache.catalina.core.StandardService   : Starting service Tomcat
2015-05-09 10:37:09.651  INFO 20880 --- [lication.main()] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.0.20
2015-05-09 10:37:09.767  INFO 20880 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2015-05-09 10:37:09.767  INFO 20880 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 2970 ms
2015-05-09 10:37:09.979  INFO 20880 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean        : Mapping servlet: 'dispatcherServlet' to [/]
2015-05-09 10:37:09.985  INFO 20880 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'characterEncodingFilter' to: [/*]
2015-05-09 10:37:10.105  INFO 20880 --- [lication.main()] o.s.j.d.DriverManagerDataSource          : Loaded JDBC driver: org.postgresql.Driver
2015-05-09 10:37:10.214  INFO 20880 --- [lication.main()] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default'
2015-05-09 10:37:10.233  INFO 20880 --- [lication.main()] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [
    name: default
    ...]
2015-05-09 10:37:10.585  INFO 20880 --- [lication.main()] org.hibernate.Version                    : HHH000412: Hibernate Core {4.3.8.Final}
2015-05-09 10:37:10.587  INFO 20880 --- [lication.main()] org.hibernate.cfg.Environment            : HHH000206: hibernate.properties not found
2015-05-09 10:37:10.589  INFO 20880 --- [lication.main()] org.hibernate.cfg.Environment            : HHH000021: Bytecode provider name : javassist
2015-05-09 10:37:10.968  INFO 20880 --- [lication.main()] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {4.0.5.Final}
2015-05-09 10:38:00.023  INFO 20880 --- [lication.main()] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.PostgreSQLDialect
2015-05-09 10:38:00.041  INFO 20880 --- [lication.main()] o.h.e.jdbc.internal.LobCreatorBuilder    : HHH000424: Disabling contextual LOB creation as createClob() method threw error : java.lang.reflect.InvocationTargetException
2015-05-09 10:38:00.274  INFO 20880 --- [lication.main()] o.h.h.i.ast.ASTQueryTranslatorFactory    : HHH000397: Using ASTQueryTranslatorFactory

有什么想法吗？我能做些什么来诊断问题吗？

Answer 1

对于Spring Boot,您可以在application.properties文件中进行设置:

spring.jpa.properties.hibernate.temp.use_jdbc_metadata_defaults=false

我还发现我需要设置另一个属性,否则我会收到错误"org.hibernate.HibernateException:当'hibernate.dialect'没有设置"时,对DialectResolutionInfo的访问不能为空.为了纠正我设置此属性:

spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect

这将我们的启动时间从大约100秒减少到12秒.

Answer 2

用问题解决了

properties.setProperty("hibernate.temp.use_jdbc_metadata_defaults", "false");

谢谢大家.

Answer 3

application.yml属性设置的贡献版本。

spring:
  jpa:
    properties:
      hibernate:
        temp:
          use_jdbc_metadata_defaults: false

Answer 4

您在本地服务器上运行测试吗？也许数据库服务器 URL 存在一些问题，例如不可解析的主机名或 IPv6 DNS 条目，使用来自另一个应用程序的相同连接字符串（例如http://squirrel-sql.sourceforge.net/）进行连接可以确认问题。

第一次创建数据库连接时（加载驱动程序或执行连接时）肯定会记录延迟。