组装WAR的Maven错误：使用纯Java Based Configuration构建SpringMVC项目时不需要webxml属性，也没有xml的 [英] Maven Error assembling WAR: webxml attribute is required when building the SpringMVC project with pure Java Based Configuration and no xml's

问题描述

我正在使用纯Java配置开发Spring MVC项目。我在进行Maven干净安装时收到以下错误。

I am developing a Spring MVC project with pure Java based configuration. I am getting the error below when I do a Maven clean install.

无法执行目标
org.apache.maven。插件：maven-war-plugin：2.2：war（默认战争）on
项目SpringMVC-ShoppingCart：组装WAR时出错：webxml属性需要
（或者预先存在的WEB-INF / web.xml）如果在更新
模式下执行） - > [帮助1]

Failed to execute goal org.apache.maven.plugins:maven-war-plugin:2.2:war (default-war) on project SpringMVC-ShoppingCart: Error assembling WAR: webxml attribute is required (or pre-existing WEB-INF/web.xml if executing in update mode) -> [Help 1]

错误说 web缺少.xml ，但由于我使用的是基于纯Java的配置，因此我没有。

The error says that web.xml is missing, but I did not have one since I used pure Java based configuration.

如何确保项目构建和在没有 web.xml的情况下创建war文件？

How to make sure that the project builds and creates war file without web.xml?

推荐答案

发生此错误是因为 maven-war-plugin <在版本2.6或更低版本中，/ a>默认情况下会在WAR项目中出现 src / main / webapp / web.xml 文件，但它没有找到它。

This error happens because the maven-war-plugin, in version 2.6 or lower, expects by default a src/main/webapp/web.xml file to be present in your WAR project, and it didn't find it.

从插件版本3.0.0开始，存在 web。 xml 默认情况下不再是强制性的：

As of version 3.0.0 of the plugin, the presence of a web.xml is not mandatory by default anymore:

failOnMissingWebXml 的默认值已从<更改code> true 到 false 。

这意味着直接升级插件可以解决问题。您可以在POM中添加以下配置：

This means that upgrading the plugin directly solves the issue. You can add the following configuration in your POM:

<plugin>
  <artifactId>maven-war-plugin</artifactId>
  <version>3.0.0</version>
</plugin>

原因是自Servlet 3.0起， web.xml 文件，可以用注释替换以具有基于Java的配置（ MWAR-262 ）。但是，由于您的项目可能不使用注释来替换此文件，在这种情况下实际上可能缺少 web.xml ，因此在版本3.0.1中添加了一个健全性检查。插件，以确保注释 @WebServlet 位于WAR项目的编译类路径中（ MWAR-396 ）。如果不是，并且项目中没有 web.xml 文件，默认情况下该插件仍会失败。

The reason is that since Servlet 3.0, the web.xml file is no longer needed in a web application, and can be replaced with annotations to have a Java-based configuration (MWAR-262). However, since your project might not use annotations to replace this file, in which case the web.xml could actually be missing, a sanity check was added in version 3.0.1 of the plugin to make sure that the annotation @WebServlet is in the compile classpath of your WAR project (MWAR-396). If it isn't, and there is no web.xml file in your project, the plugin will still fail by default.

如果您只是希望插件明确忽略丢失的 web.xml 文件，无论注释的用法如何，您都可以设置 failOnMissingWebXml 参数为 false 。示例配置为：

If you just want the plugin to explicitly ignore a missing web.xml file, regardless of the usage of annotations, you can set the failOnMissingWebXml parameter to false. A sample configuration would be:

<plugin>
  <artifactId>maven-war-plugin</artifactId>
  <version>2.6</version>
  <configuration>
    <failOnMissingWebXml>false</failOnMissingWebXml>
  </configuration>
</plugin>

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