我是 Spring Boot 的新手，我從 1.5.3 復制了一個專案，并讓應用程式使用此代碼運行 spring/application.java
@SpringBootApplication(scanBasePackages = "com.company")
@ComponentScan(basePackages = "com.company")
@EntityScan(basePackages = "com.company")
@EnableTransactionManagement
@EnableScheduling
public class Application {
private static final Logger log = LoggerFactory.getLogger(Application.class);
public static void main(String[] args) throws Exception {
// log.info("Starting up... main args: " Arrays.asList(args));
System.setProperty("spring.devtools.restart.enabled", "false");
// Runs Orchestration:run(args) via Spring
new SpringApplicationBuilder(Application.class)
// .web(WebApplicationType.NONE) <- this part is uncommented in 2.2.7 run
.run(args);
}
}
我也有一個 @Component 類，它在呼叫 SpringApplicatoinBuilder 之后運行。
@Component
public class Orchestration implements CommandLineRunner {
@Override
public void run(String...args) throws Exception {
// stuff
}
}
當我將模塊 pom 檔案中的所有依賴項從 1.5.3.RELEASE 升級到 2.2.7.RELEASE 時，應用程式似乎不再呼叫 Orchestration @Component 了。我查看了其他示例并引入了本文https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.0-Migration-Guide 中提到的遷移器依賴項。但是沒有正確運行 Spring App 的運氣。
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>${spring-boot.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jms</artifactId>
<version>4.3.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
<version>${spring-boot.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jersey</artifactId>
<version>${spring-boot.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<version>${spring-boot.version}</version>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<version>${spring-boot.version}</version>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>${spring-boot.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-properties-migrator</artifactId>
<version>${spring-boot.version}</version>
</dependency>
</dependencies>
The worst part is that I don't get any compilation or runtime errors so I'm not sure what is incorrect here. Can someone more experienced in Spring 2.2.7 help me with my projects setup?
EDIT 10/13/2021 6:18pm When updating to 2.5.5 release I do get an error message at the SpringApplicationBuilder class ...
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:108)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:88)
Caused by: java.lang.NoClassDefFoundError: org/springframework/core/metrics/ApplicationStartup
at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:253)
at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:266)
at org.springframework.boot.builder.SpringApplicationBuilder.createSpringApplication(SpringApplicationBuilder.java:108)
at org.springframework.boot.builder.SpringApplicationBuilder.<init>(SpringApplicationBuilder.java:97)
at com.planalytics.rp.orchestration.spring.Application.main(Application.java:35)
... 8 more
Caused by: java.lang.ClassNotFoundException: org.springframework.core.metrics.ApplicationStartup
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:151)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 13 more
uj5u.com熱心網友回復：
這些依賴項由您宣告的 Spring Boot 核心工件拉取。這通常是通過spring-boot-starter-parent您宣告為專案的父 pom 來完成的。
為了將您的專案更新到 Spring 5（實際發布的版本），您必須將 spring-boot-starter-parent 父宣告從 1.5.3 更新到 2.X（spring-boot-dependencies如果您不使用起始父母）。您確實可以在 Spring Boot 2 的發行說明中看到：
Spring Boot 2.0 建立在 Spring Framework 5 之上并需要它。
請注意，從 Spring Boot 1.5.3 更新到 Spring Boot 2 可能會對您的應用程式產生一些影響。因此，您應該小心謹慎地測驗您的應用程式以識別所有這些。Spring-Boot-2.0-Migration-Guide 也是緩解遷移的好資源。
這是通過將 org.springframework.boot:spring-boot-starter:jar:2.0.2.RELEASE 宣告為專案的父級而獲得的片段
$ mvn dependency:tree
[INFO] Scanning for projects...
[INFO]
[INFO] ----------------------------------------------------
[INFO] Building demo 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-dependency-plugin:3.0.2:tree (default-cli) @ demo ---
[INFO] com.example:demo:jar:0.0.1-SNAPSHOT
[INFO] - org.springframework.boot:spring-boot-starter:jar:2.5.5.RELEASE:compile
[INFO] | - org.springframework.boot:spring-boot:jar:2.5.5.RELEASE:compile
[INFO] | | \- org.springframework:spring-context:jar:5.0.6.RELEASE:compile
[INFO] | | - org.springframework:spring-aop:jar:5.0.6.RELEASE:compile
[INFO] | | - org.springframework:spring-beans:jar:5.0.6.RELEASE:compile
[INFO] | | \- org.springframework:spring-expression:jar:5.0.6.RELEASE:compile
[INFO] | - org.springframework.boot:spring-boot-autoconfigure:jar:2.5.5.RELEASE:compile
[INFO] | - org.springframework.boot:spring-boot-starter-logging:jar:2.5.5.RELEASE:compile`
...
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