When I create a web application from scratch and add jsf-api-2.2.11.jar and jsf-impl-2.2.11.jar to pom.xml (add them to apps classpath) and deploy it to Tomcat 7, JSf is initializing automatically:
INFO [j.e.r.w.j.config] - Mojarra 2.2.11 ( 20150505-0732 https://svn.java.net/svn/mojarra~svn/tags/2.2.11#14688) ..... initialized.
In older versions I used to start it declarativly by defining it in web.xml (listener+servlet). So I already commented them out and set "metadata-complete" to "true" (does that even stop classpath scanning?), but it is still loading.
In this case I dont want it to load, while leaving the Jars in classpath and i.e. the faces-config.xml in web-inf.
What is still triggering the initialization?
It's loaded via a Servlet 3.0 ServletContainerInitializer implementation in the JSF implementation JAR file (in case of Mojarra, it's the com.sun.faces.config.FacesInitializer). It will auto-register the FacesServlet on the URL patterns *.jsf, *.faces and /faces/* (JSF 2.3 will add *.xhtml to the list of URL patterns). Latest JSF 2.1 implementations and all JSF 2.2 implementations will do it when deployed to a Servlet 3.0 compatible container. For detail about this new Servlet 3.0 ServletContainerInitializer thing, head to this answer: ServletContainerInitializer vs ServletContextListener.
The right way to stop it is removing the JSF implementation from the dependencies (note that you do not need to remove the JSF API as well). You seem to not be making use of it in any way. After all, a properly designed web application should not have any JSF implementation specific dependencies. I only wonder, why exactly would you leave the JSF API in? Using a 3rd party JSF based library for non-JSF purposes? This might indicate and end up in other (architectural) problems.
Another way of stopping it is downgrading your web application to be Servlet 2.5 targeted by editing the <web-app> root declaration in web.xml accordingly to comply that version. But this has many other side effects which may not be desireable when the intent is to develop a Servlet 3.0 compatible web application.
The "listener" you're referring to is actually not necessary, it's only to workaround buggy containers with timing errors in parsing TLD files, such as early GlassFish v3 and Jetty versions. See also a.o. Configuration of com.sun.faces.config.ConfigureListener.
Related
As JSF 2.3, #ManagedBean and other javax.faces.bean.* annotations are deprecated and replaced with JavaEE 6 CDI.
I successfully made a sample JSF project and deployed it to WebLogic using server implementations 'glassfish.jsf.jar' and with no implementation of JSF nor CDI in the WEB-INF/lib.
But I am afraid to be stuck with Server implementation that may be out of date in sometimes + my application behave differently during work in different application servers so I think it would be better if I have control over JSF implementation.
I spent the last 4 days for searching for a way to use a custom JSF implementation (Mojarra or MyFaces) using new CDI annotations or any other DI framework but with no luck.
I got that I must use JavaEE server implementation of JSF and CDI if I want to get rid of #ManagedAnnotations.
My question: is there a way to include my preferred implementation of JSF and CDI in my WAR that will be deployed to different application servers like WebLogic and WildFly.
Note: I found an old question from 2013 with No as an answer but I want to know is this answer still valid
Edit 02/11/2018:
I successfully install a project with embedded JSF (Mojarra) and CDI (Weld) without any problem on Tomcat Server. I think it's because Tomcat is Servlet Container so there are no conflicts.
I think my problem because of the conflict between my embedded CDI and Server implementation version of Weld. I can not find a solution to make my application is as blackbox.
I used this weblogic.xml
false
<prefer-application-packages>
<package-name>!javax.servlet.*</package-name>
</prefer-application-packages>
<prefer-application-resources>
<resource-name>!javax.servlet.*</resource-name>
</prefer-application-resources>
The other answer is sort of still valid. But there are sort of other (better) options
1 Also provide the full java-ee container as part of your app.
2 Require a minimal version of specific app servers
3 Tell customers they need at least specific versions of certain libraries
I'm reviewing a current JSF project where the web.xml configuration contains:
the FacesServlet (configured on *.xhtml)
the com.sun.faces.config.ConfigureListener
I'm using JSF 2.2 and Mojarra implementation.
I'm confused about the ConfigureListener. Is this class needed in the configuration? What is the goal of this class? I couldn't find any information and the class has almost no javadoc.
If I remove this configuration, everything seem to work the same way. Thus I guess that the ConfigureListener could or should be removed but I am not sure.
The ConfigureListener is normally automatically registered via /META-INF/jsf_core.tld file of Mojarra implementation JAR file. Additionally, the ConfigureListener is explicitly registered via a Servlet 3.0 ServletContainerInitializer in order to workaround an old GlassFish v3 bug (note: v3, not 3.0.x, thus really that one first GF3 version ever).
There exist situations wherein the auto-registration via .tld file is insufficient. The well known one is when the webapp is deployed to Jetty. This is explained in detail in this Q&A: could not find Factory: javax.faces.context.FacesContextFactory.
Also, as mentioned before and in that detailed answer, GlassFish v3 has a bug wherein the TLD file is scanned too late and thus JSF couldn't do its necessary initialization thing at the right moment. You'd then need to explicitly register the ConfigureListener in webapp's web.xml.
But if it works for you when it's not explicitly registered in web.xml, then just keep it out. Less noise in web.xml is better. But if you happen to possibly deploy to a container sensitive to the mentioned problem (so when your webapp is actually a publicly distributed one and you have no control over choice of target container), then you'd better keep it in "for the case that".
Update: It appears that Tomcat 8.x shows buggy behavior when this entry is enabled in web.xml: this listener will actually be executed twice instead of only once. The consequence is disastrous: among others, all JSF event listeners will be registered twice and component libraries will be loaded twice. This leads only to conflicts during runtime. In other words, when deploying to Tomcat, make sure that this entry is removed from web.xml.
I have a Spring 4.1.1, JSF 2.2.3, Primefaces 5.1 web application that run on Java 8 and Tomcat 8.
Everything worked perfectly until my colleague added the javaee-api-7.0 as a dependency for javax for ActiveMQ.
With this jar in, every ajax call doesn't submit data to the backend. For example filters on primefaces datadatable would always pass an empty value, ajax refresh wouldn't take into account processed fields, etc. If I remove the jar, everything start to work again.
Unfortunately the logs don't show any error, the output is exactly the same of when the jar is not included. I'm not sure also with which component the conflict is, I would assume JSF but I have no clue and I can't find any documentation online.
Everything worked perfectly until my colleague added the javaee-api-7.0 as a dependency for javax for ActiveMQ.
You're indeed not supposed to have that JAR in webapp's runtime classpath. This kind of library is supposed to be already provided by the target Java EE container. Examples of Java EE containers are WildFly, GlassFish, Liberty, TomEE, etc. You've there however Tomcat, which is a barebones servletcontainer supporting from the huge Java EE API only JSP, Servlet and EL APIs, on which you have to manually install every other Java EE artifact, such as JSF and JMS.
The javaee-api.jar contains ALL Java EE APIs, including the JSF API (which is of 2.2.0 version). In your case, this one apparently got precedence in classloading over the JSF API version which you already had in /WEB-INF/lib. This will only result in "odd" behavior, because the loaded JSF impl version doesn't match the loaded JSF API version.
You need to solve it differently. You need to install JMS in its own API/impl JAR files, exactly like as you already did for JSF, and thus absolutely not via a "global" javaee-api.jar file. In case of ActiveMQ, the JMS API is available in activemq-all.jar. Use that one instead. It covers everything needed in order to get ActiveMQ to run on Tomcat.
See also:
how to include javax.jms.* in eclipse?
How do I import the javax.servlet API in my Eclipse project?
I'm reviewing a current JSF project where the web.xml configuration contains:
the FacesServlet (configured on *.xhtml)
the com.sun.faces.config.ConfigureListener
I'm using JSF 2.2 and Mojarra implementation.
I'm confused about the ConfigureListener. Is this class needed in the configuration? What is the goal of this class? I couldn't find any information and the class has almost no javadoc.
If I remove this configuration, everything seem to work the same way. Thus I guess that the ConfigureListener could or should be removed but I am not sure.
The ConfigureListener is normally automatically registered via /META-INF/jsf_core.tld file of Mojarra implementation JAR file. Additionally, the ConfigureListener is explicitly registered via a Servlet 3.0 ServletContainerInitializer in order to workaround an old GlassFish v3 bug (note: v3, not 3.0.x, thus really that one first GF3 version ever).
There exist situations wherein the auto-registration via .tld file is insufficient. The well known one is when the webapp is deployed to Jetty. This is explained in detail in this Q&A: could not find Factory: javax.faces.context.FacesContextFactory.
Also, as mentioned before and in that detailed answer, GlassFish v3 has a bug wherein the TLD file is scanned too late and thus JSF couldn't do its necessary initialization thing at the right moment. You'd then need to explicitly register the ConfigureListener in webapp's web.xml.
But if it works for you when it's not explicitly registered in web.xml, then just keep it out. Less noise in web.xml is better. But if you happen to possibly deploy to a container sensitive to the mentioned problem (so when your webapp is actually a publicly distributed one and you have no control over choice of target container), then you'd better keep it in "for the case that".
Update: It appears that Tomcat 8.x shows buggy behavior when this entry is enabled in web.xml: this listener will actually be executed twice instead of only once. The consequence is disastrous: among others, all JSF event listeners will be registered twice and component libraries will be loaded twice. This leads only to conflicts during runtime. In other words, when deploying to Tomcat, make sure that this entry is removed from web.xml.
Is there any other way to tell Java EE 6 app server that project is going to use JSF than having an empty faces-config.xml?
I'd love to do this somehow using annotations or maybe initialization code on appcontext. Having an empty faces-config.xml looks namely really ugly to me. I'm pretty okay with default configuration, just wondering if it's possible to drop the physical faces-config.xml file somehow.
Currently I already don't have any web.xml and I'm quite ok with that, so registering the FacesServlet manually is not what I'm looking for.
This is only supported in JSF 2.1 and above, not in JSF 2.0. So you have to upgrade your JSF 2.0 libraries to JSF 2.1 or to target an apsperver which bundles JSF 2.1.
Yes you can remove it,in JSF 2 you dont need a faces-config.xml file unless you want to declare message resources,converters,validators,el resolvers etc.