Maven战争在两个地方都有META-INF文件夹 [英] Maven war has META-INF folder in two places

问题描述

我正在一个使用JAAS的项目中，不幸的是，Tomcat要求将文件放在战争根源的META-INF文件夹中

app.war
  |__META-INF
  |    |___context.xml
 ...

我认为这已经很奇怪了，因为WAR的默认META-INF位置在classes文件夹中.

app.war
  |__WEB-INF
  |    |__classes
  |         |__META-INF
 ...

所以我正在使用Maven，它指出src/main/resources/META-INF中的所有内容都将被复制到适当的位置.奇怪的是，它还在文件结构的根目录中创建了一个META-INF文件夹，只剩下2个META-INF文件夹.

项目结构

app
  |__src/main/java
  |__src/main/resources
  |       |__META-INF
  |             |__context.xml
 ...

mvn打包后

 app
  |__META-INF [1]
  |__WEB-INF
  |     |__classes
  |           |__META-INF [2]
  |                  |__context.xml
 ...

因此，如果战争标准规定META-INF应该位于classes文件夹下(如#2)，那么为什么maven war创建了#1文件夹.并有一种方法可以使它将文件复制到该文件夹​​中，而不是#2?

致谢

解决方案

所以我发现了这一点:

两个Meta-Inf文件夹-正常结构?

指出拥有2个META-INF文件夹不是问题.挖了一点我发现:

JAR文件规范

说明META-INF文件夹:

JAR文件本质上是一个zip文件，其中包含一个可选的META-INF目录. ...如果有META-INF目录，它用于存储软件包和扩展程序配置数据，包括安全性，版本控制，扩展程序和服务.

和这个:

JSR-000315 JavaTM Servlet 3.0

在10.6节中说明了WAR文件的结构:

打包成这种格式后，将显示一个META-INF目录，该目录 包含对Java存档工具有用的信息. 此目录不能直接 容器作为响应Web客户端请求的内容充当内容，尽管 内容通过getResource和getResourceAsStream对Servlet代码可见 .此外，任何访问META-INF中资源的请求 目录必须返回SC_NOT_FOUND(404)响应.

因此，从WAR规范中来说，正确的位置是WEB-INF/classes/META-INF.但是，由于war是一个特殊的jar文件，所以将/META-INF作为扩展点很有意义.可以在JPA persistence.xml和Tomcat context.xml文件中看到这种不同的用法:前者应放在WEB-INF/classes/META-INF中，而后者应放在/META-INF中.

I'm working on a project which uses JAAS and unfortunately for me Tomcat requires a file to be put in a META-INF folder in the root of the war

app.war
  |__META-INF
  |    |___context.xml
 ...

I think that it's already weird since the default META-INF location for WAR's is in the classes folders.

app.war
  |__WEB-INF
  |    |__classes
  |         |__META-INF
 ...

So I'm using Maven, which states that anything in src/main/resources/META-INF will be copied to the appropriate place, which it does. The weird thing is that it is also creating a META-INF folder in the root of the file structure leaving me with 2 META-INF folders.

Project Structure

app
  |__src/main/java
  |__src/main/resources
  |       |__META-INF
  |             |__context.xml
 ...

After mvn package

 app
  |__META-INF [1]
  |__WEB-INF
  |     |__classes
  |           |__META-INF [2]
  |                  |__context.xml
 ...

So, if the war standard states that META-INF should be under classes folder, as in #2, why maven war creates the #1 folder. And is there a way to make it copy files into that folder instead of #2?

Regards

解决方案

So I found this:

Two Meta-Inf folders - normal structure?

which states that having 2 META-INF folders is not a problem. Digging a little I found:

JAR File Specification

which states about the META-INF folder:

A JAR file is essentially a zip file that contains an optional META-INF directory. ...The META-INF directory, if it exists, is used to store package and extension configuration data, including security, versioning, extension and services.

and this:

JSR-000315 JavaTM Servlet 3.0

which, on section 10.6, states about the WAR file structure:

When packaged into such a form, a META-INF directory will be present which contains information useful to Java archive tools. This directory must not be directly served as content by the container in response to a Web client’s request, though its contents are visible to servlet code via the getResource and getResourceAsStream calls on the ServletContext. Also, any requests to access the resources in META-INF directory must be returned with a SC_NOT_FOUND(404) response.

So from the WAR spec the right place is WEB-INF/classes/META-INF. Yet, since war is a special jar file, it makes sense to have /META-INF as a point for extensions. One can see such different uses in JPA persistence.xml vs. Tomcat context.xml files: the former should be placed in WEB-INF/classes/META-INF while the latter in /META-INF.

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