Flex :: Query Execution Using Spring And HIbernate Together?
Nov 5, 2010
I'm going to be using Flex 4 with Spring and Hibernate.Everything is configured and working. I know this as I can do simple queries, like listing all values in a table.Problem is when I try to perform a 'select' query, then I get all the values, as I was getting before, and not the specific attributes through Select query.I'm a beginner, so kindly overlook my lack of more technically sound words..but I don use them as I don wanna mis-quote.This is class used to store data coming from the MySQL database--
I try to start JEE, so after studying the frameworks avalaible for this architecture, i choose to use the following one: Flex, BlazeDS, Spring, Hibernate, mysql. i will work with eclipse or STS.The problem is that, after trying different project all over web tutorial, i wasn't able to create an architecture that gather all the last versions off technologies i choose.SO, can someone send me a links which refer a tutorial where it's preferable that the source code is available to download, and it gives the explanation about what is done.
I am developing a IT Monitoring Dashboard for the company I work at. The system will primarily perform monitoring of files, databases and servers. There will be a small part of the system which will allow the users to configure static data about the system eg: file locations, server names etc...
So as the app. will be a dashboard a lot of the application will consist of publishing data to the flex client to update all the monitoring views. So there will be limited database activity ie: insert/update/deletes.
I'm trying to implement a simple application which uses Flex on the front end and a Spring/Hibernate application on the back end, with communication between the two going over a BlazeDS channel.
I'm seeking direction as to the best and/or simplest way to approach this. I have the UI set up in such a way that the user is presented with a file chooser in which they pick the image file they want to upload. When this is chosen and submitted (as a form submission) then the server side should receive the image file data as well as some related metadata such as a description and date, then populate a Hibernate entity/POJO with the image file data and related metadata, and then persist the entity/POJO into the database.
I have found some examples of how you would do a file upload and download using servlets here and the FileReference class (here and here) but these don't appear to address the problem in a way which leverages BlazeDS and/or Spring/Hibernate. I want to put the image file data and related metadata (description, capture date, etc.) into a value object within the Flex application and then send this over BlazeDS to a service provided by my Spring/Hibernate application running on Tomcat. In this service I want to extract the image data (both the actual JPG/PNG/GIF data and the related metadata such as description, etc.) from the value object sent from the Flex app into an entity/POJO which is then persisted via Hibernate in my database.
Can this be done, and if so what's the best way to go about it? Am I mistaken in assuming that if I use BlazeDS then I am somehow bypassing the need to provide HTTP-based services such as servlets on the server side and instead I can use my Java services as "RemoteObjects"? Is there necessarily a one-to-one mapping between Java POJO/entity class and the Flex value object class when making this sort of transfer? If so is there a tool which creates corresponding Flex value objects from Java POJOs or vice versa.
Update: Some code to make this more clear:I have this as my value object in Flex:
When I set a breakpoint in the method above and look at the image variable it looks to be empty, so I'm assuming that the transformation from the Flex value object to the Java POJO did not go as expected and that there's more to it than just adding a RemoteClass alias in the Flex value object class.
I'm working on a project where we use Flex, Spring, Hibernate and Blazeds,all working on a Weblogic server.Everything works fine and we call services at the server side from the flex app without problems,but now we need to limit the time who spent the execution of the services to 2 seconds, if any service takes more than 2 seconds the server must return a timeout to the flex app.I've been searching for a way to do this with the blazeds configuration, but it looks that it's not possible.Is there any way to achieve this? I've thought in add a filter to the blazeds requests so it can control the timeout... But I can't find any example and I don't have enough knowledge of filter.
I tried asking this on the Spring forums ([URL]) but did not get a response. I'm working on a web application that has an (end user) user interface built in Flex and a management user interface built using Spring MVC. I'm trying to secure both interfaces and can get each one working separately, but not together. I'm using a snapshot build of spring-flex-core 1.5.0 with Spring Security 3.1RC1 and Spring 3.1M1
I'm obviously missing something but while the Spring Flex documentation describes how to configure a hybrid MVC+Flex application at the servlet level it appears to only consider security from the perspective of a flex-only application.
I have a situation where i have relations like this:A person has one or more addresses.A customer has one or more addresses.Person,customers and addresses are separate tables.I used to do this with the @OneToMany relations.This is giving me problems since our flex client is sending me objects wich are created in the client ad have to be created in the DB.If the client sends me a person and customer which reference to the same address hibernate will create two address objects since the two address object are not the same java objects (not the same pointers).This is a problem which is caused by BlazeDS and Dozer which will create new objects when they are send to the server.So what i would like to have is the address id in the person and customer object without an relation so hibernate does not create the objects. But when i read a person object i would like to fill a transient address object based on the stored address id.
I need to be able to tell when the os has came back from sleep/hibernate/standby.Problem I'm having is that I have a timer that needs to fire at certain time. The delay is calculated so that it will fire on certain hour:min:sec. Problem is when the os goes to sleep, the timer is "paused," which caused the timer to fire on wrong time. I would like to be able to update the timer delay when the os comes back from sleep but there doesn't seem to be a way to do this...
I create a Flex application that works with a browser using a database with the MySQL server that I can create, modify and delete data from a database. The problem I encounter now is that I want to see my program with Adobe AIR (virtual machine). At the display that does not pose a problem. The problem is that air can not reach the database server is located in the MySQ. the error message displayed is as follows: "Error : client.Error.MessageSend - Channel.connect.failed error tConnection.Call.Failled : HTTP: Status 404:url:'[URL]"
I am preparing a document for a project. The project's backend is developed in Java, frontend is adobe flex. I am not sure about the correct way of describe the project in Model-View-Controller way.
For Model layer: Using Hibernate Java beans to implement all the business logic and persistence? For View Layer: Using Adobe flex send post or get request to Controller layer, and get respond in XML format. For Controller Layer: Using Java servlet to handle requests from Flex client?
I'm developing a web application (client in Flash Builder 4, server in Eclipse 3.6 + Tomcat 7 + Spring 3 Framework). How do I make the Flex client automatically deploy in the Tomcat server and use BlazeDS messaging and remoting more seamlessly?
Flex with add-ons such as BlazeDs to integrate with Spring. I have no experience using Flex, I just read some articles and tutorial about it, but I really would like to learn something new :-) Google Web Toolkit, maybe with something like gwt-ext. No experience, but I really like to learn. It's plenty of support out there if I need, but I think I will struggle to maintain Spring MVC and GWT in the same project, I read that it's not so easy but there are a couple of patterns to follow.
Some background: I have a Flex app embedded in an HTML page and am using Flex to send a soap request to my Java backend that does some authentication depending on the username and password entered in the Flex form. If I enter the correct login everything works fine and the Flex app can continue making further requests. But with an incorrect username/password, an "Authentication Required" dialog box pops up in my Browser and my Flex app won't respond with its proper handler until I click cancel. I'd like to get rid of the dialog box somehow,
I have been trying to upgrade spring-flex 1.0.3 to 1.5.2 in order to check new features, i.e. Hibernate lazy fetching support in BlazeDS 4. I downloaded all necessary packages, changed dependencies in Maven for Spring (to 3.0.7), Hibernate (to 3.6.9) and Spring flex core (to 1.5.2). When I try to build and deploy application, I got NullPointerException which indicates cause in my domain class (at the end of stack trace):
We have a Flex-BlazeDS-Spring-JMS application. The issue is sometimes we get a Blazeds error: NoSuchMethodException. It is not able to find the Java service. The weird issue with this it does not happen all the item...1 time it goes through and returns the result, the 2nd time it fails, 3rd time fails and so on. Also not all methods fail, only 2 method calls fail.
I've got the Spring Security preauthentication sample configured and working with JBoss. The next step is to somehow get the user information into a flex client GUI. What are some methods that will let me get the Authentication or UserDetails object that's created by spring-security on http access into the flex client? Since I'm logging in externally, I can't use channelset.login(), right? All the examples I've seen so far assume that the user logs in manually through the flex client, but the requirement is for container-based authentication. Using flex3, spring 3.0.4, spring-security-3.0.3
The reference doc ( here ) tells us to download the sample application: Included in the project distribution is a collection of samples called the Spring BlazeDS Integration Test Drive. This samples project is set up to be built with Maven and then imported into Eclipse for running the application via WTP.
The samples in question, must either be spring-flex-testdrive-spring3.zip which is linked to in the document or spring-flex-testdrive-spring3.zip based on the notion that this is release 1.5.0.M1 (docs and samples).After I configure maven as described with the proper environment variable:
I have a typical Flex-based application that was written to use a Java/Hibernate/MySQL backend. The client changed the requirements - now they want to distribute it on a CD where the user can just run the app without any installation or a network connection.
To do this, I certainly need to eliminate the web server and the database server and adapt my application (with as few changes as possible, of course) to a stand-alone application that will fit on a CD/DVD. I've managed to export the data to XML and read it into Flex, but I'm wondering if there's a way to recreate the Hibernate data structures in Flex so I could change as little code as possible. Failing that, is there any way to keep the existing Java/Hibernate external to the Flex code but retrievable without installing Apache Tomcat or MySQL?
The Spring BlazeDS integration (in our cases 1.0.5M1) allows us to define MessageInterceptor instances and register them in the message broker. what this mechanism should or shouldn't be used for?
From the API documentation I can see that the framework itself uses interceptors for Spring Security integration. We were thinking of using these interceptors as a way of enforcing our own special kind of security (we track our users using our own services in the application context), where a condition is evaluated every time a message is sent across the wire.
I'm trying to figure out the best way to leverage a vanilla HttpServlet from a Spring-Flex (with BlazeDS) project I'm working on. My team has an HttpServlet that they've used in the past (that some other team built) that processes a request given some key/value pairs passed over HTTP GET. I want to use this HttpServlet class to do the same work, but I want to call it in Java, when my Flex client invokes a method on a Service. Ideally, the class invoking the HttpServlet can use the standard @Service and @RemotingDestination annotations (see here).
So, this is the HttpServlet: import java.io.IOException; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.net.HttpURLConnection; import java.net.URL; [Code] .....
How to write my @Service class. I've tried going down a few different roads, but haven't had much luck. So far, I've considered and come up with secondary questions on the matter (but I've yet to work out the solution): Do I need a @Controller for this sort of work? Do I need a Servlet Factory? Can the HttpServlet be a Spring managed bean, and call the ASP page another way? (I like this idea least) Should I call the HttpServlet from Flex, and leverage logging and data the Servlet needs with a Remote Object? The reason for my stubbornness in wanting to do this from Java is that I want to do some logging, and maybe leverage some other Singleton beans in the scope of the @Service class. However I work this out, I want to be as close to "Best Practices" as possible.
I have a spring BlazeDS integration application. I would like to log all the request.I planned to use Filter. In my filter when I check the request parameter. It does not contain anything related to the client request. If I change the order of my filter(I have spring Security), then it prints some thing related to spring security.I am unable to log the user request.