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Following is the DOCTYPE definition for JSF version 10 configuration files that makes use of the 10 DTD:
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<!DOCTYPE faces-config PUBLIC "-//Sun Microsystems, Inc//DTD JavaServer Faces Config 10//EN" "http://javasuncom/dtd/web-facesconfig_1_0dtd"> <faces-config> <!-- Configuration file contents go here --> </faces-config>
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Next is the DOCTYPE definition for JSF version 11 configuration files:
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<!DOCTYPE faces-config PUBLIC "-//Sun Microsystems, Inc//DTD JavaServer Faces Config 11//EN" "http://javasuncom/dtd/web-facesconfig_1_1dtd"> <faces-config> <!-- Configuration file contents go here --> </faces-config>
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The definition shown next specifies the XML schema for JSF version 12 configuration files:
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<faces-config xmlns="http://javasuncom/xml/ns/javaee" xmlns:xsi="http://wwww3org/2001/XMLSchema-instance" xsi:schemaLocation= "http://javasuncom/xml/ns/javaee/web-facesconfig_1_2xsd" version="12"> <!-- Configuration file contents go here --> </faces-config>
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Finally, the following definition specifies the XML schema for JSF version 20 configuration files:
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<faces-config xmlns="http://javasuncom/xml/ns/javaee" xmlns:xsi="http://wwww3org/2001/XMLSchema-instance" xsi:schemaLocation= "http://javasuncom/xml/ns/javaee/web-facesconfig_2_0xsd" version="20"> <!-- Configuration file contents go here --> </faces-config>
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Notice that for XML schema there is no DOCTYPE declaration The XML schema being used is defined via the xmlns:xsi and xsi:schemaLocation attributes of the root element (<faces-config>) of the configuration file Also note that all of the other Java EE config files, such as webxml, and Tag Library Descriptors (TLDs) are now governed by XML schema instead of DTDs as of Java EE version 5 When JSF reads a configuration file, its XML parser uses the DOCTYPE definition to determine the DTD or schema with which the XML file must conform If configured to do so, the XML parser will validate the XML file s conformance to the DTD or XML schema and prevent application startup if an error occurs, such as out of order elements, or poorly formed XML markup
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15:
Configuring JavaServer Faces Applications
Understanding XML Schemas
XML Schema was developed by W3C and made an official recommendation in 2001 XML Schema was developed to solve some problems with DTDs, such as providing an XML syntax for describing the document itself, rather than the different, non-XML notation of the DTD, and providing a way to associate concrete data types with markup elements Unfortunately, W3C XML Schema ended up being very obtuse and difficult to understand, and went way beyond solving just these problems Nevertheless, it is the standard chosen for describing XML documents in Java EE 5, so it s important to understand how it works Thankfully, most modern IDEs, including NetBeans, have support for visual editing of XML schema files XML schemas specify a set of elements and attributes that make up a specific XML document type along with specifying the order in which elements must be placed in the file, and the relationship between elements Additionally, XML schemas define which element attributes are required and which are optional The main difference between a DTD and an XML schema is that XML schemas are themselves XML documents Because of this, XML schemas offer a much richer format for defining an XML document type This allows for a more specific definition of the format that an XML document type must have
PART III
Understanding How Configuration Files Are Processed
At Web application startup, JSF implementations use a standardized algorithm for locating and loading configuration files The locating and loading of configuration files is completed before any requests can be processed by the Web application If any of the configuration files being loaded causes an XML parsing error, the application startup process will be aborted and the application will not be accessible Following is the process and order in which configuration files are located and loaded: Check for the existence of a /META-INF/faces-configxml file in each jar file accessible by the servlet context class loader and load it if it exists JSF 20 also will load any file in META-INF that ends in faces-configxml, for example META-INF/ myfaces-configxml This means all jar files in the WEB-INF/lib directory will be scanned, and this is how custom JSF components can declare themselves to the JSF runtime (See 10 for more on building a self-contained JSF component library jar) The drop your jar into WEB-INF/lib and it will automatically be configured and loaded feature has been a part of JSF since its first release Check for the existence of a javaxfacesCONFIG_FILES context parameter in the application s webxml deployment descriptor and, if it exists, load the list of comma-delimited files it specifies The following example configuration file illustrates the use of the javaxfacesCONFIG_FILES context parameter:
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc//DTD Web Application 23//EN" "http://javasuncom/dtd/web-app_2_3dtd"> <web-app> <display-name>Example</display-name> <description>Example Application</description> <context-param> <param-name>javaxfacesCONFIG_FILES</param-name> <param-value>
Part III:
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