java-ee-7 - w3toppers.com

javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL does not work anymore since Java EE 7 / EL 3.0

Fixed with a custom resolver: faces-config.xml: <application> <el-resolver>my.package.EmptyNullStringResolver</el-resolver> </application> EmptyNullStringResolver.java: /** * @author pg */ public class EmptyNullStringResolver extends ELResolver { @Override public Class<?> getCommonPropertyType(ELContext context, Object base) { return String.class; } @Override public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) { return null; } @Override public Class<?> getType(ELContext context, Object base, Object property) { return null; … Read more

Meaning of bean discovery mode annotated in CDI 1.1

When using bean-discovery-mode=”annotated” only classes with a bean defining annotation are discovered. All other classes are ignored. Any scope type is a bean defining annotation. If a scope type is declared on a bean class, then the bean class is said to have a bean defining annotation [spec]. The 1.1 spec is not completely clear … Read more

Notify only specific user(s) through WebSockets, when something is modified in the database

Session? Since it is available when the first handshake request is made, any attribute set to that session afterwards will not be available in the server endpoint i.e. in other words, any session attribute set after a handshake is established will not be available It seems that you got bitten by the ambiguity of the … Read more

Which XML namespace to use with JSF 2.2 and up

Which one is recommended? Go ahead with XML namespaces on xmlns.jcp.org domain. This was newly introduced since Java EE 7 in 2013 (which covers a.o. JSF 2.2, Servlet 3.1, CDI 1.1, etc). Do note that this not only affects Facelets files, but also XML configuration files such as faces-config.xml, web.xml, beans.xml, etc. The old XML … Read more

How to enable Cross domain requests on JAX-RS web services?

I was wondering the same thing, so after a bit of research I found that the easiest way was simply to use a JAX-RS ContainerResponseFilter to add the relevant CORS headers. This way you don’t need to replace the whole web services stack with CXF (Wildfly uses CXF is some form, but it doesn’t look … Read more

Accessing HttpSession from HttpServletRequest in a Web Socket @ServerEndpoint

Update (November 2016): The information provided in this answer is for the JSR356 spec, individual implementations of the spec may vary outside of this information. Other suggestions found in comments and other answers are all implementation specific behaviors outside of the JSR356 spec. If the suggestions in here are causing you problems, upgrade your various … Read more

Real time updates from database using JSF/Java EE

Preface In this answer, I’ll assume the following: You’re not interested in using <p:push> (I’ll leave the exact reason in the middle, you’re at least interested in using the new Java EE 7 / JSR356 WebSocket API). You want an application scoped push (i.e. all users gets the same push message at once; thus you’re … Read more

What is WEB-INF used for in a Java EE web application?

The Servlet 2.4 specification says this about WEB-INF (page 70): A special directory exists within the application hierarchy named WEB-INF. This directory contains all things related to the application that aren’t in the document root of the application. The WEB-INF node is not part of the public document tree of the application. No file contained … Read more