SpringBoot：在 pom.xml 文件中定义主 class

Question

我使用 Spring 初始化器生成了一个 Spring Boot web 应用程序，嵌入 Tomcat，Thymeleaf 模板 engine.Technologies 使用：Spring Boot 1.4。 2.RELEASE、Spring 4.3.4.RELEASE、Thymeleaf 2.1.5.RELEASE、Tomcat 嵌入 8.5.6、Maven 3、Java 8。我有这个 pom.xml 文件，

然后我使用此命令生成 war

mvn clean package -DskipTests -Dspring.profiles.active=pebloc,war -DAPPKEY=pebloc

pom.xml:

<?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.bookcloud</groupId>
    <artifactId>bookcloud</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>bookcloud</name>
    <description>Book Cloud </description>

    <profiles>
        <profile>
            <id>jar</id>
            <properties>
                <spring.boot.mainclass>com.bookcloud.iot.BookCloudApplication</spring.boot.mainclass>
            </properties>
        </profile>
        <profile>
            <id>war</id>
            <properties>
            <spring.boot.mainclass>com.bookcloud.iot.BookCloudApplicationWar</spring.boot.mainclass>
            </properties>
        </profile>
    </profiles>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency> 

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>
         <dependency>
            <groupId>it.ozimov</groupId>
            <artifactId>spring-boot-email-core</artifactId>
            <version>0.5.1</version>
        </dependency>
        <dependency>
            <groupId>it.ozimov</groupId>
            <artifactId>spring-boot-thymeleaf-email</artifactId>
            <version>0.5.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-batch</artifactId>
        </dependency>

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

        <!-- https://mvnrepository.com/artifact/com.icegreen/greenmail -->
        <dependency>
            <groupId>com.icegreen</groupId>
            <artifactId>greenmail</artifactId>
            <version>1.5.3</version>
            <optional>true</optional>
            <scope>test</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
        </dependency>     

        <!-- hot swapping, disable cache for template, enable live reload -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>


        <dependency>
            <groupId>org.hsqldb</groupId>
            <artifactId>hsqldb</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Camden.SR5</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>               
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                        <configuration>
                            <mainClass>${spring.boot.mainclass}</mainClass>
                         </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>


</project>

但我仍然遇到这个错误：

[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.5.2.RELEASE:repackage (default) on project bookcloud: Execution default of goal org.springframework.boot:spring-boot-maven-plugin:1.5.2.RELEASE:repackage failed: Unable to find a single main class from the following candidates [com.bookcloud.iot.BookCloudApplication, com.bookcloud.iot.BookCloudApplicationWar] -> [Help 1]

BookCloudApplication.java

@Profile("!war")
@SpringBootApplication
@Import({SecurityConfig.class ,PersistenceConfig.class, ServiceConfig.class})
public class BookCloudApplication {

    public static void main(String[] args) {
        SpringApplication.run(BookCloudApplication.class, args);
    }
}

BookCloudApplicationWar.java

@Profile("war")
@Import({SecurityConfig.class ,PersistenceConfig.class})
@SpringBootApplication
public class BookCloudApplicationWar extends SpringBootServletInitializer {

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(BookCloudApplicationWar.class);
    }

    public static void main(String[] args) throws Exception {
        SpringApplication.run(BookCloudApplicationWar.class, args);
    }

}

Answer 1

Maven 配置文件和 Spring 配置文件是两个不同的概念。

您还应该运行 Maven 使用 war 配置文件，以便 spring.boot.mainclass 属性设置正确的匹配值。

将 -Pwar 添加到命令行以激活 war Maven 配置文件。

mvn clean package -DskipTests -Pwar -Dspring.profiles.active=pebloc,war -DAPPKEY=pebloc

Answer 2

Maven 个个人资料与 Spring 个个人资料无关。

您有两个 Maven 配置文件：jar，war

您可以使用：

mvn clean package -Pjar

或

mvn clean package -Pwar

您在构建工件时遇到错误，因为 pom 需要：

<start-class>your.app.entry.point.Main</start-class>

在属性元素内。

无论 Maven 配置文件如何，我建议只开始 class。

类似于：

pom.xml:

...
<modelVersion>4.0.0</modelVersion>
<groupId>com.asimio.cloud</groupId>
<artifactId>zuul-server</artifactId>
<version>0-SNAPSHOT</version>
<packaging>${packaging.type}</packaging>
...
<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>your.app.entry.point.Main</start-class>
  <packaging.type>jar</packaging.type>
...
<profiles>
  <profile>
    <id>war</id>
    <properties>
      <packaging.type>war</packaging.type>
    </properties>
    <dependencies>
      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
        <scope>provided</scope>
      </dependency>
    </dependencies>
...
  </profile>
</profiles>
...

Main.java:

package your.app.entry.point;
...
@SpringBootApplication
@Import({SecurityConfig.class ,PersistenceConfig.class, ServiceConfig.class})
public class App extends SpringBootServletInitializer {

  @Override
  protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
    return builder.sources(App.class);
  }

  public static void main(String[] args) {
    SpringApplication.run(App.class, args);
  }
}

不需要 Spring 个配置文件。现在可以使用 Maven 配置文件构建此工件，并将运行使用：

java -jar .....

将此工件构建为 jar 时

或

当使用 -Pwar Maven 配置文件构建时，作为部署到 servlet 容器的 war 文件。

SpringBoot：在 pom.xml 文件中定义主 class

SpringBoot: Defining the main class in pom.xml file

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