java-ee

问题 I'm implementing Server-Sent Events using Servlet 3.0's javax.servlet.AsyncContext interface. However I can't understand how I should handle I/O errors like peer disconnect. For a given AsyncContext ac = request.startAsync() , I can call ac.getResponse().getWriter().print(something) and then ac.getResponse.getWriter().flush() and it works fine. However when a client disconnects, I don't get an error - even if I attach a listener, its onError method is not called. I tested it with both Jetty 8

问题 I am using Linux machine, remotely through putty, for deploying our Java EE Application. Inside the Tomcat server folder I need to find a property called bayer.home . I have used the following command: grep bayer.home /home/HHHuser/tomcat to check if the property exists inside the Tomcat folder. Please tell me is this correct or not? If it's incorrect could anybody please tell me where the property names, say bayer.home , most probably would be defined? 回答1: grep 'bayer.home' /home/HHHuser

问题 For my web app I will loading a few details from the static DB tables which I plan to load when the container starts up on a HolderClass in a singleton bean. I will inject this class wherever I wish to use the static data. So basically I want to avoid loading the static data everytime from DB Current Implementation: public Class CountryHolder(){ List<Country> allCountries; public void init(){ this.countries = loadAllCountries; } public List<Country> loadAllCountries(){ // Perform DB select

问题 I am trying to pass a set of JPA entity from the business tier to the presentation tier. All is deployed on the same app server (Glassfish 4). The client is deployed as a .war file, while the Business Tier as an .ear with the ejb reachable trough a Remote interface. For this I have those very simple methods, with absolutely no logic: Client public List<CompletedDesign> selectCompletedDesigns() { try { List<CompletedDesign> designs = customerFacade.selectCompletedDesigns(); return designs; }

问题 I have a few classes that observe some CDI event. Is it possible to declare which class should be used in different cases? For example I have class that produce events: class Producer { @Inject private Event<SomeEvent> event; public void fire() { event.fire(new SomeEvent()); } } And I have two consumer classes: class ConsumerA { public void onEvent(@Observes SomeEvent event); } class ConsumerB { public void onEvent(@Observes SomeEvent event); } How can I use ConsumerA instances in one case

问题 I am getting java.lang.IllegalStateException: getOutputStream() has already been called for this response when user clicks on a download link in my struts2 web application. This exception occurs only when the client has third-party download managers installed in their machines like Internet Download Manager. Without IDM or any other third party download managers, our code runs fine without any exception. Solutions we have tried are : We have observed that IDM sends requests to the server in

问题 I see a lot of how to read the file or locate it, but I've been trying to run Properties.store() and it simple does not modify the file. I can read, get and set properties but store doesn't work. Should it work or is not meant to work? If it doesn't work, how can I modify the file, so when the server restart those properties do not get lost? 回答1: No; it's inside a WAR. Technically you could un-zip it, modify it, zip it back up. But don't. Properties like that should be stored in a DB, in JNDI

问题 I need some placeholders with automatic filling in my resource bundle. An user of my application has two possible configuration, for example "1" and "2". Depending on this configuration, an entry should returned with the correct value. I know, that conditions are possible: currentConfig=The configuration is currently the {0,choice,0#first|1#second} In my faces-config.xml the resource bundle is configured for access in JSF. Now, I want to get this value in JSF without specifying parameters: <h

问题 have a problem that am dealing with since 6 hours but don't get to solve it. Am developping a Dynamic web project using JSF/Tomcat 7/ Maven/Java 7 Everytime I run the project on the server I get this: javax.naming.NameNotFoundException: Name [....ProjectManagement/service] is not bound in this Context. Unable to find [de.hhn.team3.artzpraxismanagement.ProjectManagement]. at org.apache.naming.NamingContext.lookup(NamingContext.java:820) at org.apache.naming.NamingContext.lookup(NamingContext

问题 I'm getting the following error while trying to deploy my app in Glasfish 3.1 org.apache.jasper.JasperException: PWC6033: Error in Javac compilation for JSP PWC6197: An error occurred at line: 16 in the jsp file: /WEB-INF/jsp/signup/signup.jsp PWC6199: Generated servlet error: string:///signup_jsp.java:233: package org.springframework.web.servlet.tags.form does not exist The spring jars are in the lib directory of my webapplication. I'm using: Spring 3.1.3 Glassfish 3.1.1 (started using the