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Satisfying Compile-Time and Runtime Dependencies
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If using a container that does not contain a JSF implementation, make sure to include JSF and its required jars in WEB-INF/lib For Sun s JSF implementation, this is jsf-apijar and
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Appendix C:
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Migrating from Struts to Faces
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jsf-impljar Sun s JSF implementation also requires commons-beanutilsjar, commonscollectionsjar, commons-loggingjar, and commons-digesterjar If you plan to use JSTL (and in most cases you will have to do so) the jstljar and standardjar must also be included Finally, incorporate the struts-facesjar in WEB-INF/lib Note that all required taglibs that you must use in a Struts-Faces application are bundled in the preceding jars Therefore, it is not necessary to take any action to place TLD files in any specific place in the system In fact, you don t need TLD files at all if they are all inside the jars
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Declaring the FacesServlet
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As shown in 2, you need to declare the FacesServlet in your webxml:
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<servlet> <servlet-name>FacesServlet</servlet-name> <servlet-class>javaxfaceswebappFacesServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet>
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Note the <load-on-startup> element This is important in order to ensure that the FacesServlet is loaded before the Struts ActionServlet, which must have a load-on-startup value of 2 or higher
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Mapping the FacesServlet
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Again, as in 2, you must map the FacesServlet to the prefix or extension mapping of your choice It is acceptable to use both kinds of mappings:
<servlet-mapping> <servlet-name>FacesServlet</servlet-name> <url-pattern>/faces/*</url-pattern> <url-pattern>*jsf<url-pattern> </servlet-mapping>
Replacing the Standard Struts Request Processor
Modify your application s struts-configxml file to include the appropriate custom RequestProcessor implementation If your application uses tiles, include the following markup:
PART V
<controller> <set-property property="processorClass" value="orgapachestrutsfacesapplicationFacesTilesRequestProcessor"/> </controller>
Otherwise include the markup shown next:
<controller> <set-property property="processorClass" value="orgapachestrutsfacesapplicationFacesRequestProcessor"/> </controller>
The two different RequestProcessor implementations extend TilesRequestProcessor and RequestProcessor, respectively, but are otherwise identical
Part V:
Appendixes
Migrating the JSP Pages
For each JSP page in your Struts application, migrate them to use JSF components instead of the Struts HTML tag library For example, in Struts you might have the following:
<html:radio property="instrument" value="TRUMPET"/>Trumpet <html:radio property="instrument" value="CLARINET"/>Clarinet <html:radio property="instrument" value="SAXOPHONE"/>Saxophone
Whereas, in JSF you would have
<h:selectOneRadio id="instrument" value="#{beaninstruments}" layout="pageDirection" />
where #{beaninstruments} is a method expression that points to a value that is a list of javaxfacesmodelSelectItem instances This migration may be done in a page by page fashion; it doesn t all have to be done at once For example, you could migrate just the store front page at first, and leave the rest for later A vital part of migrating a page is converting the use of a subset of the tags in the Struts HTML tag library that are not present in Faces Such tags are provided in the tags-faces tag library, included in the Struts-Faces distribution This tag library is declared in your application in place of the tags-html tag library For example, using pure Struts you would have
<%@ taglib uri="http://strutsapacheorg/tags-html" prefix="html" %>
However, using the Struts-Faces library you would have the following:
<%@ taglib prefix="s" uri="http://strutsapacheorg/tags-faces" %>
The required taglibs are shown in Table C-3 Note that the tags-logic and tags-bean libraries have been replaced with the jstl/core library It is recommended to use JSTL wherever possible to replace a Struts tag library
Taglib URI in Struts http://strutsapache org/tags-logic http://strutsapache org/tags-tiles ttp://strutsapache org/tags-bean http://strutsapache org/tags-html
Conventional Prefix logic tiles bean html
Taglib URI in Faces http://javasuncom/jsp/jstl/core No direct analog in Faces, though you can use Tiles in Faces as is http://javasuncom/jsp/jstl/core http://javasuncom/jsf/html
Conventional Prefix c tiles c h
TABLE C-3 Struts and Faces JSP Tag Libraries
Appendix C:
Migrating from Struts to Faces
JSF 12 TIP While the recommendation to use JSTL still stands for JSF 11 and 12, some caveats are
necessary for JSF 11 In JSF 11, c:forEach and c:if did not work properly with JSF Unfortunately, neither do their Struts taglib counterparts These problems have been fixed in JSF 12 Not all tags in the Struts tag libraries have analogs in their Faces counterparts Most importantly is the case of the tags-html library For these cases, the Struts Faces distribution provides the tags-faces tag library The URI for this tag library is http://strutsapacheorg/ tags-faces and the common prefix is s Use the following rule when answering the question: What taglib should I use when I m trying to migrate from tags-html to JSF
TIP Look first in the tags-faces tag library for a corresponding tag to the one in tags-html or jsf/
html If there is no tag in tags-faces in either of the tags-html or jsf/html libraries, then just use the tag in jsf/html Most importantly, always use the s:form tag instead of the h:form one The s:form is the key to enabling many of the Struts features and omitting it will essentially break your application Another special case is the html:cancel tag Usages of this tag must be replaced by h:commandButton with the id attribute set to cancel This special id enables Struts to recognize this as a cancel button
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