Ist <load-on-startup> für ein Servlet im Deployment-Deskriptor der Java-Webanwendung optional?

Question

Ist das Element <load-on-startup> optional für eine <servlet>-Definition im Implementierungsdeskriptor für die Java-Webanwendung (WEB-INF/web.xml)?

Answer 1

Ja ...

Zum Beispiel sagt http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd

<xsd:element name="load-on-startup" 
     type="j2ee:xsdIntegerType" 
     minOccurs="0"> 
<xsd:annotation> 
    <xsd:documentation> 

    The load-on-startup element indicates that this 
    servlet should be loaded (instantiated and have 
    its init() called) on the startup of the web 
    application. The optional contents of these 
    element must be an integer indicating the order in 
    which the servlet should be loaded. If the value 
    is a negative integer, or the element is not 
    present, the container is free to load the servlet 
    whenever it chooses. If the value is a positive 
    integer or 0, the container must load and 
    initialize the servlet as the application is 
    deployed. The container must guarantee that 
    servlets marked with lower integers are loaded 
    before servlets marked with higher integers. The 
    container may choose the order of loading of 
    servlets with the same load-on-start-up value. 

    </xsd:documentation> 
</xsd:annotation> 
    </xsd:element>