JEE
April 1, 2017
JEE

References

web.xml deployment descriptor

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6.0 -> for Java EE 10
5.0 -> for Java EE 9
4.0 -> for Java EE 8
3.1 -> for Java EE 7
3.0 -> for Java EE 6
2.5 -> for Java EE 5
2.4 -> for Java EE 4

Jakarta EE 10 XML schema, namespace is https://jakarta.ee/xml/ns/jakartaee

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<web-app xmlns="https://jakarta.ee/xml/ns/jakartaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_6_0.xsd"
         version="6.0">
</web-app>

Java EE 7 XML schema, namespace is http://xmlns.jcp.org/xml/ns/javaee

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<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 
		    http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
            version="3.1">
</web-app>

Java EE 6 XML schema, namespace is http://java.sun.com/xml/ns/javaee

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<web-app xmlns="http://java.sun.com/xml/ns/javaee"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
            http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
            version="3.0">
</web-app>