java - 从Main迁移到Gradle时未发现主类错误

Question

我正在将一个Maven项目迁移到STS中。

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来转换命令“gardle init”，并且得到了以下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 boot app运行时

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

我已经尝试过刷新，重建，更新gradle项目等。我还指定了如下的主类名称:

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

可能是什么问题:

插件或包装问题？

jar兼容性问题？

还是其他？

Answer 1

您是否尝试过使用:

./gradlew bootRepackage或./gradlew bootJar生成可执行的jar

./gradlew bootRun运行

按照描述

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，则根据最新文档https://spring.io/blog/2017/04/05/spring-boot-s-new-gradle-plugin使用bootJar任务代替bootRepackage

The bootRepackage task has been replaced with bootJar and bootWar tasks for building executable jars and wars respectively. Both tasks extend their equivalent standard Gradle jar or war task, giving you access to all of the usual configuration options and behaviour.

您应用的运行配置:

使用以下命令更新您的构建文件:

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'
}

使用以下命令构建jar。这将在项目的build / libs目录中生成sdk-devproxy-0.0.1-RELEASE.jar。

gradle构建

使用以下命令运行应用程序:

gradlew引导运行