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''INFO'': This is not necessary for OpenCms 7.0 or above.

1. in '''WEB-INF/web.xml''' change the Header:
 <nowiki>
   <web-app xmlns="http://java.sun.com/xml/ns/j2ee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
        version="2.4">
 </nowiki>
[[Image:Changing_from_Servlet_2.3_to_Servlet_2.4_web-xml.GIF]]
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2. in '''WEB-INF/opencms.tld''' enable for all TAG-Attributes rtexprvalue:
 <rtexprvalue>true</rtexprvalue>
[[Image:Changing_from_Servlet_2.3_to_Servlet_2.4_opencms-tld.GIF]]
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3. restart tomcat
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4. Replace the OpenCms-Expressions in your Resources <br />
e.g. "${opencms.uri}" into "${'${'}opencms.uri}" or since OpenCms 6.2.3 into "%(opencms.uri)") <br />
[[Image:Changing_from_Servlet_2.3_to_Servlet_2.4_opencmsexpressions.GIF]]
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5. JSTL: Update The Libraries to 1.1.2<br />
[[Image:Changing_from_Servlet_2.3_to_Servlet_2.4_JSTL-LIBS.GIF]]
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6. JSTL: Update TAGS-URI from "http://java.sun.com/jstl/..." to "http://java.sun.com'''/jsp'''/jstl/"<br />
[[Image:Changing_from_Servlet_2.3_to_Servlet_2.4_JSTL-TAG-URIS.GIF]]