如何将模块声明注入JAR？ [英] How to inject module declaration into JAR?

问题描述

假设我有一些库 lib.jar 我没有源代码（或者它是用一些不知道模块的非Java语言编写的）。 lib.jar 没有 module-info.class ，我不想将它用作自动模块，所以我想将 module-info.class 注入其中。

Suppose I have some library lib.jar for which I do not have the source code (or it is written in some non-Java language which is unaware of modules yet). lib.jar does not have module-info.class and I do not want to use it as an automatic module, so I would like to inject module-info.class into it.

我首先生成 module-info.java ，使用以下命令：

I first generate module-info.java with the following command:

jdeps --generate-module-info . lib.jar

假设生成类似的东西：

module lib {
    exports package1;
    exports package2;
}

然后我尝试编译它但是 javac 失败，因为包 package1 和 package2 不存在：

Then I try to compile it but javac fails because the packages package1 and package2 do not exist:

> javac module-info.java
module-info.java:4: error: package is empty or does not exist: package1

当然，我可以创建目录 package1 和 package2 ，其中包含虚拟类，但是有更好的方法吗？

Of course, I can create directories package1 and package2 with dummy classes in them, but is there some better approach?

推荐答案

是的，这可以通过 - 补丁模块实现选项。此选项最常用于运行时，但它也可以在编译时使用：

Yes, this is possible with the --patch-module option. This option is most often used at runtime, but it also works at compile time:

javac --patch-module <module name>=<path to jar> module-info.java

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