使用Docker和Maven的Spring Boot - JAR中缺少清单

Question

我目前正尝试在Docker中运行带有多个pom文件的Java Spring Boot项目。我有以下项目结构：

.
├── application1
|   |── src
│   └── pom.xml
|── application2
|   |── src
│   └── pom.xml
|── shared 
|   └── src
|   └── pom.xml
|
└── pom.xml

我的目标是为application1和application2运行Docker容器。这两个应用程序都依赖于共享模块，该模块通过pom.xml文件作为依赖项包含在内。

根目录中的Pom.xml文件：

<?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.parent</groupId>
    <artifactId>com-example-parent</artifactId>
    <packaging>pom</packaging>
    <version>1.0</version>

    <!-- sub modules -->
    <modules>
        <module>application1</module>
        <module>application2</module>
        <module>shared</module>
    </modules>

    <properties>
        <java.version>1.8</java.version>
        <maven.plugins.version>2.22.1</maven.plugins.version>
    </properties>

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

    <dependencyManagement>
        <dependencies>
            <dependency>
                <!-- Import dependency management from Spring Boot -->
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.1.4.RELEASE</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>
                            <classifier>exec</classifier>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-failsafe-plugin</artifactId>
                <version>${maven.plugins.version}</version>
                <configuration>
                    <useSystemClassLoader>false</useSystemClassLoader>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>${maven.plugins.version}</version>
                <configuration>
                    <useSystemClassLoader>false</useSystemClassLoader>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

共享目录中的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>

    <parent>
        <groupId>com.example.parent</groupId>
        <artifactId>com-example-parent</artifactId>
        <version>1.0</version>
    </parent>

    <groupId>com.example.shared</groupId>
    <artifactId>com-example-shared</artifactId>
    <packaging>jar</packaging>
    <version>1.0</version>

</project>

application1目录中的Pom.xml文件：

<?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>

    <parent>
        <groupId>com.example.parent</groupId>
        <artifactId>com-example-parent</artifactId>
        <version>1.0</version>
    </parent>

    <groupId>com.example.application1</groupId>
    <artifactId>com-example-application1</artifactId>
    <packaging>jar</packaging>
    <version>1.0</version>

    <dependencies>
        <dependency>
            <groupId>com.example.shared</groupId>
            <artifactId>com-example-shared</artifactId>
            <version>1.0</version>
        </dependency>
    </dependencies>

</project>

我的Dockerfile：

FROM maven:3-jdk-8 as builder

WORKDIR /app
ADD ./ /app
RUN mvn install -pl application1 -am

FROM openjdk:8-jre-alpine AS runtime
COPY --from=builder /app/application1/target .
ENTRYPOINT ["java", "-jar", "com-example-application1-1.0.jar"]

构建图像没有任何问题。但是，当我尝试执行docker run来启动容器时，我收到一个错误：no main manifest attribute, in com-example-application1-1.0.jar。有谁知道我做错了什么？我应该在Dockerfile中运行不同的mvn命令还是pom.xml文件中有问题？ （full example project on Github）

Answer 1

在@khmarbaise的帮助下，我设法让它运转起来。我对问题中的代码执行了以下操作：

• 从root pom.xml中删除了failsafe和surefire插件
• 将Spring Boot maven构建插件移动到application1和application2。不应在根目录的pom.xml中使用Maven插件
• 将Dockerfile的入口点更改为：ENTRYPOINT ["java", "-jar", "com-example-application1-1.0-exec.jar"]