“webxml attribute is required” error in Maven

问题

I am getting the following error:

Error assembling WAR: webxml attribute is required (or pre-existing WEB-INF/web.xml if executing in update mode)

I have got web.xml in right place which is projectname\src\main\webapp\WEB-INF\web.xml

What could be causing this?

回答1:

It would be helpful if you can provide a code snippet of your maven-war-plugin. Looks like the web.xml is at right place, still you can try and give the location explicitly

<plugin>            
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-war-plugin</artifactId>
  <configuration>
    <webXml>src\main\webapp\WEB-INF\web.xml</webXml>        
  </configuration>
</plugin>

回答2:

<plugin>
    <artifactId>maven-war-plugin</artifactId>
    <version>2.4</version>
    <configuration>
        <failOnMissingWebXml>false</failOnMissingWebXml>
    </configuration>
</plugin>

This solution works for me(I was using 2.2 before). Also, I am using Java Based Configuration for Servlet 3.0 and no need to have web.xml file.

回答3:

It works perfectly for me too.

<project>

.....

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <configuration>
                    <webXml>WebContent\WEB-INF\web.xml</webXml>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

回答4:

This is because you have not included web.xml in your web project and trying to build war using maven. To resolve this error, you need to set the failOnMissingWebXml to false in pom.xml file.

For example:

<properties>
    <failOnMissingWebXml>false</failOnMissingWebXml>   
</properties>

Please see the blog for more details: https://ankurjain26.blogspot.in/2017/05/error-assembling-war-webxml-attribute.html

回答5:

If you are migrating from XML-based to Java-based configuration and you have removed the need for web.xml by implementing WebApplicationInitializer, simply remove the requirement for the web.xml file to be present.

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-war-plugin</artifactId>
    <version>2.6</version>
    <configuration>
        <failOnMissingWebXml>false</failOnMissingWebXml>
        ... 
    </configuration>

回答6:

The value of my webXml tag needed to look like this in order to work:

<webXml>${project.basedir}\src\main\webapp\WEB-INF\web.xml</webXml>

回答7:

I had the exact same problem and i solved it like this :

Make a new folder named WEB-INF under src/main/webbapp then

Right Click on your Project -> Java EE Tools -> Generate Deployment Descriptor Stub

This should generate your web.xml

I hope this helps by solving your problem :D

回答8:

It does look like you have web.xml in the right location, but even so, this error is often caused by the directory structure not matching what Maven expects to see. For example, if you start out with an Eclipse webapp that you are trying to build with Maven.

If that is the issue, a quick fix is to create a
src/main/java and a
src/main/webapp directory (and other directories if you need them) and just move your files.

Here is an overview of the maven directory layout: http://maven.apache.org/guides/introduction/introduction-to-the-standard-directory-layout.html

回答9:

If you change the default project path, you must specify the location of the web.xml file, for example:

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-war-plugin</artifactId>
            <version>2.5</version>
            <configuration>
                <webXml>src\main\web\WEB-INF\web.xml</webXml>
            </configuration>
        </plugin>

回答10:

As per the documentation, it says : Whether or not to fail the build if the web.xml file is missing. Set to false if you want you WAR built without a web.xml file. This may be useful if you are building an overlay that has no web.xml file. Default value is: true. User property is: failOnMissingWebXml.

<plugin>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.1.1</version>
                <extensions>false</extensions>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>            </plugin>

Hope it makes more clear

回答11:

It worked for me too.

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-war-plugin</artifactId>
            <configuration>
                <webXml>WebContent\WEB-INF\web.xml</webXml>
            </configuration>
        </plugin>

回答12:

mvn-war-plugin 2.3 fixes this:

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-war-plugin</artifactId>
            <version>2.3</version>
        </plugin>
        ...

回答13:

I have had the same error on the test server but not in local. After a few minutes, I discovered that the IDE wasn't synchronized with the pom.xml. Here is how I solve it:

Re-Generate the deployment descriptor with Eclipse

Right click on your project folder
In the contextual menu, choose "Java EE Tools" then "Generate Deployment Descriptor Stub"
It will create the web.xml.

Re-Generate the deployment descriptor with IntelliJ

Right click on your project folder
In the contextual menu, choose "Open Module Settings", then click on the + to add the web deployment descriptor.
Then your can change the path to your descriptor or the Web Ressource Directoriesand the on the right side.
Then you will get something like:

回答14:

Make sure pom.xml is placed properly in Project folder. and not inside target folder or any where else.

Looks like pom.xml is not relatively aligned.

回答15:

Was your folder structure altered so the file is no-longer at /src/main/webapp/WEB-INF/web.xml ?

To resolve this issue, I gave my web folder the name webapp and placed it inside the src/main. Maven seems to look for web.xml by default at /src/main/webapp/WEB-INF/web.xml. If you do this then you don't need to explicitly tell maven where web.xml is. And if you've altered your folder structure and your build recently stopped working, this could be why.

Note: This is an old post but the posted solutions don't point out why a working build would suddenly stop working.

回答16:

There are many answers and most of them will work, but I'll add one more point, which, I think, has no less importance.
According to your log message, you're using maven. Maven is a project management-build tool which is based on some conventions. It builds the project, creates proper directory structure and places files into corresponding directories which is compliant to Sun Microsystems Directory Structure Standard for Java EE/Web applications.

You may incorporate many things, including maven plugins, changing/reconfiguring project root directory, etc., but there is one simple step you can do and your project should be fine. Just place your web.xml under src\main\webapp\WEB-INF\ and try to build the project with mvn package.

I hope this adds a little bit more light to this problem.

回答17:

This error occurs because you tell to Maven to pakage files to war.

<packaging>war</packaging>

Do you really need war? If not, put jar there. Here is full code:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>
    <version>1.0-SNAPSHOT</version>

    <groupId>com.your.groupid</groupId>
    <artifactId>artifactid</artifactId>
    <packaging>jar</packaging>

来源：https://stackoverflow.com/questions/5351948/webxml-attribute-is-required-error-in-maven

标签

maven

war