> For the complete documentation index, see [llms.txt](https://jack80342.gitbook.io/spring-boot/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jack80342.gitbook.io/spring-boot/x.-appendices/e.-the-executable-jar-format/e.1.-nested-jars.md).

# 附录E.1. 内嵌JARs

Java没有提供任何标准的方式来加载内嵌的jar文件（也就是jar文件自身包含到一个jar中）。如果你需要分发一个在不解压缩的情况下可以从命令行运行的自包含应用，那这将是个问题。

为了解决这个问题，很多开发者使用"影子" jars。一个影子jar将所有jars的类打包进一个单独的"超级jar"。使用影子jars的问题是它很难分辨在你的应用中实际可以使用的库。在多个jars中存在相同的文件名（内容不同）也是一个问题。Spring Boot另辟蹊径，让你能够直接嵌套jars。


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