Java 运行 spring boot jar 时找不到或加载主类
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Could not find or load main class, when running spring boot jar
提问by J. Zhang
I Have issues running a jar that was created through 'mvn package'. I tried various solutions with no success.
我在运行通过“mvn 包”创建的 jar 时遇到问题。我尝试了各种解决方案，但没有成功。
pom.xml
pom.xml
<groupId>org.springframework</groupId>
<artifactId>rest-service</artifactId>
<version>0.1.0</version>
<packaging>jar</packaging>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.4.RELEASE</version>
</parent>
...
<properties>
<java.version>1.8</java.version>
<start-class>ves.sfdc.Application</start-class>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.0.0</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
projectroot\src\main\java\ves\sfdc\application.java
projectroot\src\main\java\ves\sfdc\application.java
@SpringBootApplication
@Configuration
@ComponentScan
@EnableAsync
@EnableScheduling
@EnableAutoConfiguration
public class Application{
@Autowired
JdbcTemplate jdbcTemplate;
@Autowired
AccountService accountService;
@Autowired
static
SfdcUtil sfdcUtil= new SfdcUtil();
@Autowired
NamedParameterJdbcTemplate jdbcTemplate2;
public static void main(String[] args) throws SecurityException, IOException {
SpringApplication.run(Application.class, args);
}
}
This project works fine in Eclipse, and when I do mvn spring-boot:run
这个项目在 Eclipse 中运行良好，当我执行mvn spring-boot:run 时
I Wonder if I'm missing something here?
我想知道我是否在这里遗漏了什么？
回答by Amit Gujarathi
The problem in this case is with maven . The dependencies you have downloaded not having the required version. Some dependencies work in bulk with each other and some times they only match up with particular version of other jars.
在这种情况下，问题出在 maven 上。您下载的依赖项没有所需的版本。一些依赖项彼此批量工作，有时它们只与其他 jar 的特定版本匹配。
Solution:- It will take some time but clear .m2 and rebuild maven to download all dependencies again. or you are having two version of same dependencies. So check all maven jars and remove jars having common names.
Solution:- It will take some time but clear .m2 and rebuild maven to download all dependencies again. or you are having two version of same dependencies. So check all maven jars and remove jars having common names.
回答by dunni
With Spring Boot you don't need the maven-shade-plugin. Spring Boot will take care of the necessary packaging.
使用 Spring Boot，您不需要 maven-shade-plugin。Spring Boot 将负责必要的包装。
If you have multiple classes with main methods, you can configure the spring-boot-maven-plugin with the correct one:
如果您有多个具有 main 方法的类，您可以使用正确的一个来配置 spring-boot-maven-plugin：
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<mainClass>ves.sfdc.Application</mainClass>
</configuration>
</plugin>
You can find a list of possible configurations in the documentation of the maven plugin: http://docs.spring.io/spring-boot/docs/1.5.3.RELEASE/maven-plugin/repackage-mojo.html
您可以在 maven 插件的文档中找到可能的配置列表：http: //docs.spring.io/spring-boot/docs/1.5.3.RELEASE/maven-plugin/repackage-mojo.html
回答by SatyaRajC
In my case it is the incorrect/improper dependency.
Found in markers > problemsis highlighting
.pomis not valid archive.
在我的情况下，这是不正确/不正确的依赖。在标记中找到> 问题是突出显示
.pom无效存档。
compile group: 'org.apache.httpcomponents', name: 'httpcomponents-client', version: '4.5.6', ext: 'pom'
compile group: 'org.apache.httpcomponents', name: 'httpcomponents-client', version: '4.5.6', ext: 'pom'
Changed this to
将此更改为
`compile group: 'org.apache.httpcomponents', name: 'httpclient', version: '4.5.6'`
