Spring Boot-如何指定备用启动类? (多个入口点) [英] Spring Boot - How to specify an alternate start-class? (Multiple Entry Points)

问题描述

我想在我的Spring-Boot应用程序中添加一个替代入口点.我希望将其保留为肥罐.这可能吗?

I want to add an alternate entry point to my Spring-Boot application. I would prefer to keep this as a fat jar. Is this possible?

根据其文档 ，属性loader.main指定要启动的主类的名称.

According to their documentation, the property loader.main specifies the name of the main class to launch.

我尝试了java -jar MyJar.jar --loader.main=com.mycompany.AlternateMain，但pom.xml中指定的起始类仍在运行(如果我从pom.xml中删除了该类，则在包装过程中会出错).

I tried java -jar MyJar.jar --loader.main=com.mycompany.AlternateMain but the start-class specified in my pom.xml was still run (and if I remove this from the pom.xml then I error during the packaging).

或者，我尝试了java -cp MyJar.jar com.mycompany.AlternateMain，但是我不知道一种将所有嵌套jar添加到类路径的好方法.

Alternatively, I tried java -cp MyJar.jar com.mycompany.AlternateMain but I don't know of a good way to add all the nested jars to the classpath.

有什么建议吗?

这是我使用的解决方案

按照jst的建议，我将启动器更改为使用PropertiesLauncher.我通过修改spring-boot-maven-plugin的配置来做到这一点.

As jst suggested, I changed my launcher to use the PropertiesLauncher. I did this by modifying the configuration of my spring-boot-maven-plugin.

<plugin>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-maven-plugin</artifactId>
  <configuration>
    <mainClass>${start-class}</mainClass>
    <layout>ZIP</layout>
    ...

<layout>ZIP</layout> 触发Spring Boot以使用PropertiesLauncher .

我创建了我的胖子罐(mvn包)，然后像这样称呼备用主罐:

I created my fat jar (mvn package) then called the alternate main like this:

java -jar -Dloader.main=com.mycompany.AlternateMain MyJar.jar

感谢您的帮助！

推荐答案

我不认为该属性适用于您的情况.有3种不同的启动程序"(回到文档中查看).如果要构建jar，则它将使用JarLauncher类.如果将其切换到PropertiesLauncher，则loader.main将很有用.

I don't believe that property would apply in your case. There are 3 different "Launchers" (go back to the docs and see). If you are building a jar it uses the JarLauncher class. If you switch it to PropertiesLauncher then loader.main would be useful.

META-INF/MANIFEST.MF

META-INF/MANIFEST.MF

Main-Class: org.springframework.boot.loader.PropertiesLauncher

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