主类未找到从maven迁移到gradle的错误

Question

我正在将一个maven项目迁移到STS中的gradle。

我的pom.xml是：

    <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.myPack</groupId>
    <artifactId>sdk-devproxy</artifactId>
    <version>0.0.1-RELEASE</version>
    <packaging>jar</packaging>

    <name>sdk-devproxy</name>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-parent</artifactId>
                <version>1.5.10.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-parent</artifactId>
                <version>Edgware.SR3</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-oauth2</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zuul</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-log4j</artifactId>
            <version>1.3.8.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.auth0/java-jwt -->
        <dependency>
            <groupId>com.auth0</groupId>
            <artifactId>java-jwt</artifactId>
            <version>3.3.0</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>sdk-devproxy</finalName>

        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>

        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-resources-plugin</artifactId>
                <version>2.7</version>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <mainClass>com.myPack.devproxy.DevProxyApp</mainClass>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <version>3.1.0</version>
            </plugin>

        </plugins>
    </build>
</project>

我已经使用自动maven来进行分级转换命令"gardle init“，我得到了下面的build.gradle。

    apply plugin: 'java'
apply plugin: 'maven'

group = 'com.myPack'
version = '0.0.1-RELEASE'

description = """sdk-devproxy"""

sourceCompatibility = 1.8
targetCompatibility = 1.8



repositories {

     maven { url "http://repo.maven.apache.org/maven2" }
}
dependencies {
    compile group: 'org.springframework.cloud', name: 'spring-cloud-starter-oauth2', version:'1.2.2.RELEASE'
    compile group: 'org.springframework.cloud', name: 'spring-cloud-starter-zuul', version:'1.4.4.RELEASE'
    compile group: 'org.springframework.boot', name: 'spring-boot-starter-web', version:'1.5.10.RELEASE'
    compile group: 'org.springframework.boot', name: 'spring-boot-starter-log4j', version:'1.3.8.RELEASE'
    compile group: 'com.auth0', name: 'java-jwt', version:'3.3.0'
}

对于这个构建是成功的，但是当我作为spring引导应用运行时，它提供了

    Error: Could not find or load main class com.myPack.mindsphere.devproxy.DevProxyApp

我尝试过更新、重建、更新分级项目等。我还指定了主要类名如下：

    jar {
  manifest {
    attributes(
      'Class-Path': configurations.compile.collect { it.getName() }.join(' '),
      'Main-Class': 'com.myPack.mindsphere.devproxy.DevProxyApp'
    )
  }
}

可能会有什么问题：

• 插件还是包装问题？
• jar兼容性问题？
• 还是别的什么？

Answer 1

你试过使用：

• 生成可执行jar的./gradlew bootRepackage或./gradlew bootJar
• 运行./gradlew bootRun

描述为

https://docs.spring.io/spring-boot/docs/2.0.2.RELEASE/gradle-plugin/reference/html/

如果您使用的是gradle版本，Gradle 3.4或更高版本，根据最新的文档https://spring.io/blog/2017/04/05/spring-boot-s-new-gradle-plugin，它使用bootJar任务代替bootRepackage

用于构建可执行jars和wars的bootRepackage任务已分别替换为bootJar和bootWar任务。这两个任务都扩展了它们等效的标准Gradle jar或war任务，允许您访问所有常见的配置选项和行为。

应用程序的运行配置：

1. 使用以下内容更新您的构建文件：

build.gradle

apply plugin: 'java'
apply plugin: 'maven'
//apply plugin: 'io.spring.dependency-management'

group = 'com.myPack'
version = '0.0.1-RELEASE'

description = """sdk-devproxy"""

sourceCompatibility = 1.8
targetCompatibility = 1.8

buildscript {
    ext {
        springBootVersion = '2.0.1.RELEASE'
    }
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath(
          "org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
    }
}

apply plugin: 'org.springframework.boot'

repositories {

     maven { url "http://repo.maven.apache.org/maven2" }
}
dependencies {
    compile group: 'org.springframework.cloud', name: 'spring-cloud-starter-oauth2', version:'1.2.2.RELEASE'
    compile group: 'org.springframework.cloud', name: 'spring-cloud-starter-zuul', version:'1.4.4.RELEASE'
    compile group: 'org.springframework.boot', name: 'spring-boot-starter-web', version:'1.5.10.RELEASE'
    //compile group: 'org.springframework.boot', name: 'spring-boot-starter-log4j', version:'1.3.8.RELEASE'
    compile group: 'com.auth0', name: 'java-jwt', version:'3.3.0'
}

bootJar {
    mainClassName = 'com.myPack.mindsphere.devproy.DevProxyApp'
}

1. 使用下面的方法构建这个罐子。这将在项目的build/libs目录中生成sdk 0.0.1-RELEASE.jar。 级构建
2. 使用以下方法运行应用程序： gradlew bootRun