can we confuse container by giving wrolg ltd location for a perticular uri

[Anil Deshpande]

Hi,

This question is just out of curiosity.

This is the myFunction.tld file.

  <?xml version="1.0" encoding="ISO-8859-1"?>

<taglib 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/web-
jsptagligrary_2_0.xsd" version="2.0">

<tlib-version>1.2</tlib-version>

<uri>DiceFunctions</uri>
	
	<function>
		<name>rollIt</name>
		<function-class>foo.DiceRoller</function-class>
		<function-signature>
			int rollDice()
		</function-signature>
	</function>
	
	<function>
		<name>random</name>
		<function-class>foo.RandomNumberGenerator</function-class>
		<function-signature>
			int getRandomNumber()
		</function-signature>
	</function>
	
	
<tag>
	
	<description>random advice</description>
	<name>advice</name>
	<tag-class>foo.AdvisorTagHandler</tag-class>
	<body-content>empty</body-content>
	
	<attribute>
		<name>user</name>
		<required>true</required>
		<rtexprvalue>true</rtexprvalue>
	</attribute>
</tag>

</taglib>  

I am following JSP 2.0 specification So I don't have to give the location of tag in DD.But to just out of curiosityi changed the <laglib-location> no non existing one. Still It worked perfectly fine.

DD looks like as follows

  <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">
	
	<servlet>
		<servlet-name>roll</servlet-name>
		<jsp-file>/TestBean.jsp</jsp-file>
	</servlet>
	
	
	<servlet-mapping>
		<servlet-name>roll</servlet-name>
		<url-pattern>/index.do</url-pattern>	
	</servlet-mapping>
	
	<jsp-config>
		<taglib>
			<taglib-uri>DiceFunctions</taglib-uri>
			<taglib-location>/WEB-INF/myLostFunctions.tld</taglib-location>
		</taglib>
	</jsp-config>

</web-app>  

No exception was thrown. It worked perfectly fine. because I don't have any muLostFunctions.tld file DiceFunctions as uri

Does that mean container doesn't get fooled by explicit declarations in DD. Does it mean it does the implicit background checking for all uri and .tld files and generate the mapping automatically.

[Balu Sadhasivam]

Does that mean container doesn't get fooled by explicit declarations in DD. Does it mean it does the implicit background checking for all uri and .tld files and generate the mapping automatically.

Yes , did you check the app startup log ?

[Anil Deshpande]

This was the startup log:

  Aug 26, 2009 11:54:06 AM org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFO: The Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre1.5.0_14\bin;.;C:\Windows\system32;C:\Windows;C:/Program Files/Java/jre6/bin/client;C:/Program Files/Java/jre6/bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Program Files\Common Files\Roxio Shared\DLLShared\;C:\Program Files\Common Files\Roxio Shared\10.0\DLLShared\;C:\Program Files\Microsoft SQL Server\90\Tools\binn\;C:\Program Files\MySQL\MySQL Server 5.1\bin;;.;C:\Program Files\Java\jdk1.5.0_14\bin;.;C:\wamp\mysql\bin;.;
Aug 26, 2009 11:54:06 AM org.apache.coyote.http11.Http11BaseProtocol init
INFO: Initializing Coyote HTTP/1.1 on http-8080
Aug 26, 2009 11:54:06 AM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 833 ms
Aug 26, 2009 11:54:06 AM org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
Aug 26, 2009 11:54:06 AM org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/5.5.27
Aug 26, 2009 11:54:06 AM org.apache.catalina.core.StandardHost start
INFO: XML validation disabled
Aug 26, 2009 11:54:08 AM org.apache.catalina.core.ApplicationContext log
INFO: org.apache.webapp.balancer.BalancerFilter: init(): ruleChain: [org.apache.webapp.balancer.RuleChain: [org.apache.webapp.balancer.rules.URLStringMatchRule: Target string: News / Redirect URL: http://www.cnn.com], [org.apache.webapp.balancer.rules.RequestParameterRule: Target param name: paramName / Target param value: paramValue / Redirect URL: http://www.yahoo.com], [org.apache.webapp.balancer.rules.AcceptEverythingRule: Redirect URL: http://jakarta.apache.org]]
Aug 26, 2009 11:54:08 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
Aug 26, 2009 11:54:08 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()
Aug 26, 2009 11:54:08 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
Aug 26, 2009 11:54:08 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()
Aug 26, 2009 11:54:08 AM org.apache.coyote.http11.Http11BaseProtocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
Aug 26, 2009 11:54:09 AM org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
Aug 26, 2009 11:54:09 AM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/63  config=null
Aug 26, 2009 11:54:09 AM org.apache.catalina.storeconfig.StoreLoader load
INFO: Find registry server-registry.xml at classpath resource
Aug 26, 2009 11:54:09 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 2921 ms
   

Which one should I look for specifically?

[Balu Sadhasivam]

Ok. I thought that would throw error/warning during startup. Thats not the case now.