# 86.6 在可执行jar运行时提取特定的版本

在一个可执行jar中，为了运行，多数内嵌的库不需要拆包（unpacked），然而有一些库可能会遇到问题。例如，JRuby包含它自己的内嵌jar，它假定`jruby-complete.jar`本身总是能够直接作为文件访问的。

为了处理任何有问题的库，你可以标记那些特定的内嵌jars，让它们在可执行jar第一次运行时自动解压到一个临时文件夹中。例如，为了将JRuby标记为使用Maven插件拆包，你需要添加如下的配置：

```markup
<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <configuration>
                <requiresUnpack>
                    <dependency>
                        <groupId>org.jruby</groupId>
                        <artifactId>jruby-complete</artifactId>
                    </dependency>
                </requiresUnpack>
            </configuration>
        </plugin>
    </plugins>
</build>
```


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