java - Spring应用程序构建失败

Question

我无法弄清楚运行 mvn spring-boot:run 命令时出了什么问题。 mvn clean install 构建成功，但对于 mvn spring-boot:run 我构建失败。 这是我运行 mvn spring-boot:run -X 时控制台中的错误日志。

    [WARNING]
    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.maven.AbstractRunMojo$LaunchRunner.run(AbstractRunMojo.java:506)
            at java.lang.Thread.run(Thread.java:745)
    Caused by: java.lang.NoClassDefFoundError: org/springframework/core/env/EnvironmentCapable
            at java.lang.ClassLoader.defineClass1(Native Method)
            at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
            at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
            at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
            at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
            at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
            at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
            at java.security.AccessController.doPrivileged(Native Method)
            at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
            at com.example.DemoApplication.main(DemoApplication.java:10)
            ... 6 more
    Caused by: java.lang.ClassNotFoundException: org.springframework.core.env.EnvironmentCapable
            at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
            ... 18 more
    [INFO] ------------------------------------------------------------------------
    [INFO] BUILD FAILURE
    [INFO] ------------------------------------------------------------------------
    [INFO] Total time: 10.024 s
    [INFO] Finished at: 2016-12-11T15:24:36+05:30
    [INFO] Final Memory: 23M/223M
    [INFO] ------------------------------------------------------------------------
    [ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.4.2.RELEASE:run (default-cli) on project demo: An exception occurred while running. null: InvocationTargetException: org/springframework/core/env/EnvironmentCapable: org.springframework.core.env.EnvironmentCapable -> [Help 1]
    org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.4.2.RELEASE:run (default-cli) on project demo: An exception occurred while running. null
            at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
            at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
            at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
            at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
            at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
            at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
            at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
            at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
            at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
            at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
            at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
            at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
            at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
            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.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
            at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
            at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
            at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
    Caused by: org.apache.maven.plugin.MojoExecutionException: An exception occurred while running. null
            at org.springframework.boot.maven.AbstractRunMojo$IsolatedThreadGroup.rethrowUncaughtException(AbstractRunMojo.java:475)
            at org.springframework.boot.maven.RunMojo.runWithMavenJvm(RunMojo.java:92)
            at org.springframework.boot.maven.AbstractRunMojo.run(AbstractRunMojo.java:234)
            at org.springframework.boot.maven.AbstractRunMojo.execute(AbstractRunMojo.java:170)
            at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
            at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
            ... 20 more
    Caused by: 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.maven.AbstractRunMojo$LaunchRunner.run(AbstractRunMojo.java:506)
            at java.lang.Thread.run(Thread.java:745)
    Caused by: java.lang.NoClassDefFoundError: org/springframework/core/env/EnvironmentCapable
            at java.lang.ClassLoader.defineClass1(Native Method)
            at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
            at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
            at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
            at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
            at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
            at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
            at java.security.AccessController.doPrivileged(Native Method)
            at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
            at com.example.DemoApplication.main(DemoApplication.java:10)
            ... 6 more
    Caused by: java.lang.ClassNotFoundException: org.springframework.core.env.EnvironmentCapable
            at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
            ... 18 more
    [ERROR]
    [ERROR]
    [ERROR] For more information about the errors and possible solutions, please read the following articles:
    [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

这是我的 pom.xml 。我还从 Eclipse IDE 中的 Activity Maven 配置文件中删除了 pom.xml，因为它是作为此链接 Spring Maven clean error - The requested profile "pom.xml" could not be activated because it does not exist 中的解决方案之一给出的。

      <?xml version="1.0" encoding="UTF-8"?>
      <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>

      <groupId>com.example</groupId>
      <artifactId>demo</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <packaging>jar</packaging>

      <name>Test</name>
      <description>Demo project for Spring Boot</description>

      <parent>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-parent</artifactId>
          <version>1.4.2.RELEASE</version>
          <relativePath />      
      </parent>

      <properties>
          <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
          <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
          <java.version>1.8</java.version>
          <start-class>com.example.DemoApplication</start-class>
      </properties>

      <dependencies>
          <dependency>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter</artifactId>
          </dependency>


      </dependencies>

      <build>
      <pluginManagement>
          <plugins>
              <plugin>
                  <groupId>org.springframework.boot</groupId>
                  <artifactId>spring-boot-maven-plugin</artifactId>
              </plugin>

              <!-- <plugin>
                  <groupId>org.codehaus.mojo</groupId>
                  <artifactId>exec-maven-plugin</artifactId>
              </plugin>  -->   
          </plugins>
          </pluginManagement>

      </build>
      </project>

Answer 1

首先检查你的类名。 maven 插件说 com.example 类未找到! 什么是<start-class>com.example</start-class>在你的 pom.xml 文件中？