Spring Boot 应用程序在运行时卡住

Question

这是我的第一个 spring-boot 应用程序。我运行了一个示例代码，它卡在“Initialized JPA EntityManagerFactory for persistence unit \'default\'”处。

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下面是代码

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package com.fredo.webservices.homefredoServcies;\n\nimport org.springframework.boot.SpringApplication;\nimport org.springframework.boot.autoconfigure.SpringBootApplication;\n\n@SpringBootApplication\npublic class HomeFredoServciesApplication {\n\n    public static void main(String[] args) {\n        SpringApplication.run(HomeFredoServciesApplication.class, args);\n    }\n\n}\n

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下面是日志

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 .   ____          _            __ _ _\n /\\\\ / ___\'_ __ _ _(_)_ __  __ _ \\ \\ \\ \\\n( ( )\\___ | \'_ | \'_| | \'_ \\/ _` | \\ \\ \\ \\\n \\\\/  ___)| |_)| | | | | || (_| |  ) ) ) )\n  \'  |____| .__|_| |_|_| |_\\__, | / / / /\n =========|_|==============|___/=/_/_/_/\n :: Spring Boot ::        (v2.3.0.RELEASE)\n\n2020-06-07 20:58:15.807  INFO 1496 --- [  restartedMain] c.f.w.h.HomeFredoServciesApplication     : Starting HomeFredoServciesApplication on ANGU with PID 1496 (C:\\Users\\ASUS\\Desktop\\java ms\\home-fredoServcies\\target\\classes started by Angu in C:\\Users\\ASUS\\Desktop\\java ms\\home-fredoServcies)\n2020-06-07 20:58:15.811  INFO 1496 --- [  restartedMain] c.f.w.h.HomeFredoServciesApplication     : No active profile set, falling back to default profiles: default\n2020-06-07 20:58:15.881  INFO 1496 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set \'spring.devtools.add-properties\' to \'false\' to disable\n2020-06-07 20:58:15.882  INFO 1496 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the \'logging.level.web\' property to \'DEBUG\'\n2020-06-07 20:58:16.799  INFO 1496 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFERRED mode.\n2020-06-07 20:58:16.822  INFO 1496 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 13ms. Found 0 JPA repository interfaces.\n2020-06-07 20:58:17.861  INFO 1496 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)\n2020-06-07 20:58:17.876  INFO 1496 --- [  restartedMain] o.apache.catalina.core.StandardService   : Starting service [Tomcat]\n2020-06-07 20:58:17.877  INFO 1496 --- [  restartedMain] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.35]\n2020-06-07 20:58:18.038  INFO 1496 --- [  restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext\n2020-06-07 20:58:18.038  INFO 1496 --- [  restartedMain] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 2156 ms\n2020-06-07 20:58:18.100  INFO 1496 --- [  restartedMain] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...\n2020-06-07 20:58:18.335  INFO 1496 --- [  restartedMain] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.\n2020-06-07 20:58:18.342  INFO 1496 --- [  restartedMain] o.s.b.a.h2.H2ConsoleAutoConfiguration    : H2 console available at \'/h2-console\'. Database available at \'jdbc:h2:mem:b2c0eff5-9805-4a71-9f66-c6c863d910f5\'\n2020-06-07 20:58:18.548  INFO 1496 --- [  restartedMain] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService \'applicationTaskExecutor\'\n2020-06-07 20:58:18.629  INFO 1496 --- [         task-1] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [name: default]\n2020-06-07 20:58:18.674  WARN 1496 --- [  restartedMain] 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\n2020-06-07 20:58:18.720  INFO 1496 --- [         task-1] org.hibernate.Version                    : HHH000412: Hibernate ORM core version 5.4.15.Final\n2020-06-07 20:58:18.966  INFO 1496 --- [         task-1] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.1.0.Final}\n2020-06-07 20:58:19.203  INFO 1496 --- [         task-1] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.H2Dialect\n2020-06-07 20:58:19.210  INFO 1496 --- [  restartedMain] o.s.b.d.a.OptionalLiveReloadServer       : LiveReload server is running on port 35729\n2020-06-07 20:58:19.317  INFO 1496 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path \'\'\n2020-06-07 20:58:19.322  INFO 1496 --- [  restartedMain] DeferredRepositoryInitializationListener : Triggering deferred initialization of Spring Data repositories\xe2\x80\xa6\n2020-06-07 20:58:19.324  INFO 1496 --- [  restartedMain] DeferredRepositoryInitializationListener : Spring Data repositories initialized!\n2020-06-07 20:58:19.344  INFO 1496 --- [  restartedMain] c.f.w.h.HomeFredoServciesApplication     : Started HomeFredoServciesApplication in 3.985 seconds (JVM running for 4.795)\n2020-06-07 20:58:19.554  INFO 1496 --- [         task-1] o.h.e.t.j.p.i.JtaPlatformInitiator       : HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]\n2020-06-07 20:58:19.562  INFO 1496 --- [         task-1] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit \'default\'\n

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Answer 1

我在调试模式下通过 Eclipse 和 Spring Tool Run Configuration 启动的应用程序遇到了同样的问题。

断点引用了某些已删除的块代码上的一行，删除错误的断点后，应用程序再次正确启动。

窗口->显示视图->断点

Answer 2

如果收到响应，请尝试点击http://localhost:8080/h2-console 。您的服务器已启动并正在运行。日志中显示 H2 控制台位于“/h2-console”。数据库位于“jdbc:h2:mem:b2c0eff5-9805-4a71-9f66-c6c863d910f5”