Java 构建 WAR 包时出现 Maven 错误（缺少 web.xml ..？）
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Maven error while building WAR package (web.xml missing..?)
提问by jwaliszko
While executing mvn install, I'm getting following error:
执行时mvn install，我收到以下错误：
Error assembling WAR: webxml attribute is required (or pre-existing WEB-INF/web.xml if executing in update mode)
组装 WAR 时出错：需要 webxml 属性（如果在更新模式下执行，则需要预先存在的 WEB-INF/web.xml）
My web application structure tree is like that:
我的 Web 应用程序结构树是这样的：
my-app
|-- pom.xml
|-- src
|-- ...
|-- WebContent
|-- ...
|-- META-INF
|-- WEB-INF
|-- classes
|-- ...
|-- lib
|-- **web.xml**
My POM file looks like that:
我的 POM 文件如下所示：
<project>
<modelVersion>4.0.0</modelVersion>
<groupId>masters.traffic</groupId>
<artifactId>traffic_web</artifactId>
<packaging>war</packaging>
<name>traffic_web</name>
<version>0.1.0</version>
<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
</build>
...
</project>
How to properly fix that issue ?
如何正确解决该问题？
Regards
问候
采纳答案by Pascal Thivent
I stronglyrecommend to use Maven's standard layout:
我强烈建议使用Maven 的标准布局：
- put the Java sources in
src/main/java(and remove thesourceDirectoryelement) - put the Web application sources in
src/main/webapp - remove the
classesandlibdirectories underWEB-INF
- 放入 Java 源代码
src/main/java（并删除sourceDirectory元素） - 将 Web 应用程序源放入
src/main/webapp - 删除下的
classes和lib目录WEB-INF
Sure, you can customize the layout but this is IMO more troubles and useless efforts than benefits. Just follow the conventions.
当然，您可以自定义布局，但这对 IMO 来说是麻烦和无用的努力，而不是好处。只需遵守约定即可。
回答by Ben J
Take a look at this comment:
看看这个评论：
Maven: Including a META-INF folder in the classes folder
I believe Maven expects a folder called "webapp", not "WebContent".
我相信 Maven 需要一个名为“webapp”的文件夹，而不是“WebContent”。
回答by Lauri Lehtinen
My guess is that maven-war-pluginis looking for src/main/webapp/WEB-INF/web.xml, but can't find it, and wants you to specify the (non-maven-standard) location explicitly. If you can't rename WebContentto webappand move it under src/main/(recommended), you could try adding something like this to your <build>
我的猜测是maven-war-plugin正在寻找src/main/webapp/WEB-INF/web.xml，但找不到它，并希望您明确指定（非 Maven 标准）位置。如果您无法重命名并将WebContent其webapp移动到src/main/（推荐）下，您可以尝试将这样的内容添加到您的<build>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<configuration>
<webXml>${basedir}/src/WebContent/WEB-INF/web.xml</webXml>
<warSourceDirectory>${basedir}/src/WebContent</warSourceDirectory>
</configuration>
</plugin>
回答by Ben Siver
I ran into this issue recently and the problem was that my resource class was not specifying an initial path at the top of the class. Each method specifed a path, but there was nothing specifying the initial path.
我最近遇到了这个问题，问题是我的资源类没有在类的顶部指定初始路径。每个方法都指定了一个路径，但没有指定初始路径。
Example:
例子：
@Path("/")
public class MyResource {
@GET
@Produces("text/html")
public String foo() {
return "foo";
}
@GET
@Path("pt")
@Produces("text/html")
public String bar() {
return "bar";
}
Will work just fine. But,
会工作得很好。但，
public class MyResource {
@GET
@Produces("text/html")
public String foo() {
return "foo";
}
@GET
@Path("pt")
@Produces("text/html")
public String bar() {
return "bar";
}
will not
将不会
回答by Ben Siver
If you're using eclispe, make sure to right click the project and create a Maven "project." You can compile as a batch from command line with updates using mvn generate:archetype -B -cpu but you might have to manually structure a few things. With this it will run as a web application or a client application. Add this code to pom.xml.
如果您使用的是 eclispe，请确保右键单击该项目并创建一个 Maven“项目”。您可以使用 mvn generate:archetype -B -cpu 从命令行编译为批处理，但您可能需要手动构建一些内容。有了它，它将作为 Web 应用程序或客户端应用程序运行。将此代码添加到 pom.xml。
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.6</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
</plugins>
