Dynamic Web Module 3.0 -- 3.1
Solution 1:
I had similar troubles in eclipse and the only way to fix it for me was to
- Remove the web module
- Apply
- Change the module version
- Add the module
- Configure (Further configuration available link at the bottom of the dialog)
- Apply
Just make sure you configure the web module before applying it as by default it will look for your web files in /WebContent/ and this is not what Maven project structure should be.
EDIT:
Here is a second way in case nothing else helps
- Exit eclipse, go to your project in the file system, then to .settings folder.
- Open the
org.eclipse.wst.common.project.facet.core.xml
, make backup, and remove the web module entry. - You can also modify the web module version there, but again, no guarantees.
Solution 2:
If you want to use version 3.1 you need to use the following schema:
http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd
Note that 3.0 and 3.1 are different: in 3.1 there's no Sun mentioned, so simply changing 3_0.xsd
to 3_1.xsd
won't work.
This is how it should look like:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:web="http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee">
</web-app>
Also, make sure you're depending on the latest versions in your pom.xml
. That is,
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.6</version>
<configuration>
...
</configuration>
</plugin>
and
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
Finally, you should compile with Java 7 or 8:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>