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• AddAllAttributes method spring mvc

  - by Nick Robertson

  I have two lists List<User> list_of_users=new ArrayList<User>(); List<String> list_of_attributes=new ArrayList<String>(); When i try to use the following lines of code: model.addAttribute("takeattributes",list_of_users); model.addAttribute("takeattributes",list_of_attributes); I realise that it keeps only the second list (list_of_attributes) and the first deleted. I was wondering how to keep both of these two lists in the model.Is this possible to be happened?Is the AddAllAttributes method what i need?If yes can anyone explain me how the AddAllAttributes method is working.I look at the spring mvc documentation but i didn't really understand.

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• Consuming Third Party web services through Spring WebServiceTemplate

  I'm trying to consume a Third Party web service, through a wsdl file provided. I would load the file locally from a Spring-J2EE based project underneath WEB-INF folder. The wsdl might have more than one operation exposed. So I need a way to be able to choose the method to be called. I would also need to make use of a JaxbMarshaller. Can anyone help with a code snippet for the same? Thanks for the help.

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• spring json writes more json then i want

  - by mkoryak

  I am using the json spring view in order to return a simple JSON object from my controller. The problem is that its returning more data then i want. it is returning the validation errors and things inside of my model when all i am doing is this in the controller: Map model = new HashMap() model.put("success", "true"); return new ModelAndView("jsonView", model); If you look at the bottom of this page in the docs it looks like i am getting back data that POST would return. i am not doing a post, i am doing a GET by going directly to the URL with params. How do i get this lib to return just the data in my model?

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• Spring Roo and aspect-oriented programming

  - by marcos

  Hello, i've been running some experiments of my own with Spring Roo and it seems to be pretty cool, but i noticed that this tool makes heavy use of AOP on the model layer. I'm thinking about creating a real project using Roo and what i would like to know is: Why AOP is everywhere? Is That ok? What are advantages and disadvantages of this approach? I'm quite new to aspect-oriented programming and some guidance would be greatly appreciated. Thanks in advance!

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• Spring MVC JSP Parameters

  - by zpinter

  I'm looking to turn off try blocks for a specific JSP page (though turning it off globally would be OK as well). From what I've gathered, it looks something like this: <jsp-param> <param-name>noTryBlocks</param-name> <param-value>true</param-value> </jsp-param> However, everywhere I see that sample it's for a weblogic.xml file. Does anybody know how I can set this JSP parameters for a Spring MVC application? web.xml? Perhaps somewhere near here?: <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean>

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• Spring data mapping problem.

  - by Yashwant Chavan

  Hi, I am using spring and hibernate along with my different components There is date field in DB as contract_end_date as a Date , so my pojo also contains date getter setter for contract_end_date, but when i submit form to Multiaction controller it gives data bindding exception for contract_end_date. It trying to search string getter setter for contract_end_date. So is there is any solution to handle this kind of problem. This is my pojo. after sumitting the form getting data binding exception public class Clnt implements java.io.Serializable { private String clntId; private String clntNm; private String busUnitNm; private String statCd; private String cmntTx; private Date contractEndDt; }

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• OpenId authentication and automatic registration with Spring Security 3.0.2

  - by xlluch

  I'm implementing an app using spring security 3.0.2 with OpenId login and registration. I can login succesfully, but if the user isn't registered i want to do: 1) Get some OpenId attributes like email and name. 2) Show to the user a registration form with just these two fields and the OpenId URI filled. I've been searching a lot but i didn't find an "ellegant" way of doing this. I wonder if some of u can come out with a solution to implement this strategy in my app. Thanks in advance.

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• Binding a select box to a Collection (with Spring)

  - by WiPU

  i have the following problem. I have a form bean and in this bean is a list with objects. List<SomeObjectForm> toDisplay; Now i want map a html select to this list. Something like that: <form:select id="inputGroupFields" path="templateKey" multiple="true"... <form:select id="inputGroupFields" path="templateKey.id" multiple="true"... And this dosnt work of course. Now i have tryed to add different custom Converter like: myConv implements Converter<SomeObjectForm, String> myConv extends StringToObject And this also not work. I'm not sure if this is the right approach or there is a easier way to do that. Some addional Infos: --i'm using spring 3.0.5 --all this happens during a web flow regards and thanks, WiPu

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• Access and modify attributes/objects which are not part of the form backing bean

  - by spa

  I use Spring MVC (via Spring Roo) to build a small web application for administering persons. In the page for creating a person the bean Person is used as form backing object (key "person" in the model map). <form:form action="${form_url}" method="POST" modelAttribute="person"> I would like to add some attributes to the model map which can be altered by the user in the creation form. Basically, I try to add a Boolean, so that I can control which page is displayed next after the user presses the submit button. I try to modify the Boolean (key "myBoolean" in the model map) using a simple checkbox: <form:checkbox id="_myboolean_id" path="myBoolean"/> However, as I am new to Spring MVC I have some difficulties here. The Boolean object is not an attribute of the form backing object. So if I try to access it the following exception is thrown (of course): Invalid property 'myBoolean' of bean class [de.cm.model.Person]: Bean property 'myBoolean' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter? Is there are way to access a value of the model map directly? The only solution I can imagine right now is a kind of wrapper object around the class Person and my additional attributes which is used as a new form backing object. However, this is more work for a IMHO simple task. Do you have a better solution?

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• How do I create a Spring 3 + Tiles 2 webapp using REST-ful URLs?

  - by Ichiro Furusato

  I'm having a heck of a time resolving URLs with Spring 3.0 MVC. I'm just building a HelloWorld to try out how to build a RESTful webapp in Spring, nothing theoretically complicated. All of the examples I've been able to find are based on configurations that pay attention to file extensions ("*.htm" or "*.do"), include an artificial directory name prefix ("/foo") or even prefix paths with a dot (ugly), all approaches that use some artificial regex pattern as a signal to the resolver. For a REST approach I want to avoid all that muck and use only the natural URL patterns of my application. I would assume (perhaps incorrectly) that in web.xml I'd set a url-pattern of "/*" and pass everything to the DispatcherServlet for resolution, then just rely on URL patterns in my controller. I can't reliably get my resolver(s) to catch the URL patterns, and in all my trials this results in a resource not found error, a stack overflow (loop), or some kind of opaque Spring 3 ServletException stack trace — one of my ongoing frustrations with Spring generally is that the error messages are not often very helpful. I want to work with a Tiles 2 resolver. I've located my *.jsp files in WEB-INF/views/ and have a single line index.jsp file at the application root redirecting to the index file set by my layout.xml (the Tiles 2 Configurer). I do all the normal Spring 3 high-level configuration: <mvc:annotation-driven /> <mvc:view-controller path="/" view-name="index"/> <context:component-scan base-package="com.acme.web.controller" /> ...followed by all sorts of combinations and configurations of UrlBasedViewResolver, InternalResourceViewResolver, UrlFilenameViewController, etc. with all manner of variantions in my Tiles 2 configuration file. Then in my controller I've trying to pick up my URL patterns. Problem is, I can't reliably even get the resolver(s) to catch the patterns to send to my controller. This has now stretched to multiple days with no real progress on something I thought would be very simple to implement. I'm perhaps trying to do too much at once, though I would think this should be a simple (almost a default) configuration. I'm just trying to create a simple HelloWorld-type application, I wouldn't expect this is rocket science. Rather than me post my own configurations (which have ranged all over the map), does anyone know of an online example that: shows a simple Spring 3 MVC + Tiles 2 web application that uses REST-ful URLs (i.e., avoiding forced URL patterns such as file extensions, added directory names or dots) and relies solely on Spring 3 code/annotations (i.e., nothing outside of Spring MVC itself) to accomplish this? Is there an easy way to do this? Thanks very much for any help.

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• How to access/use custom attribute in spring security based CAS client

  - by Bill Li

  I need send certain attributes(say, human readable user name) from server to client after a successful authentication. Server part was done. Now attribute was sent to client. From log, I can see: 2010-03-28 23:48:56,669 DEBUG Cas20ServiceTicketValidator:185 - Server response: [email protected] <cas:proxyGrantingTicket>PGTIOU-1-QZgcN61oAZcunsC9aKxj-cas</cas:proxyGrantingTicket> <cas:attributes> <cas:FullName>Test account 1</cas:FullName> </cas:attributes> </cas:authenticationSuccess> </cas:serviceResponse> Yet, I don't know how to access the attribute in client(I am using Spring security 2.0.5). In authenticationProvider, a userDetailsService is configured to read db for authenticated principal. <bean id="casAuthenticationProvider" class="org.springframework.security.providers.cas.CasAuthenticationProvider"> <sec:custom-authentication-provider /> <property name="userDetailsService" ref="clerkManager"/> <!-- other stuff goes here --> </bean> Now in my controller, I can easily do this: Clerk currentClerk = (Clerk)SecurityContextHolder.getContext().getAuthentication().getPrincipal(); Ideally, I can fill the attribute to this Clerk object as another property in some way. How to do this? Or what is recommended approach to share attributes across all apps under CAS's centralized nature?

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• Spring MVC and Weblogic integration

  - by Jeune

  I get this error whenever I try to view my tutorial app in the browser WARNING: No mapping found for HTTP request with URI [/HelloWorld.Web] in DispatcherServlet with name 'dispatcher' That just means the request is being received by the dispatcher servlet but it can't forward it to a controller. But I can't seem to know where the problem is. I think I've mapped this correctly: <bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="/HelloWorld.Web">indexController</prop> </props> </property> </bean> <bean id="indexController" class="com.helloworld.controller.IndexController"> <property name="artistDao" ref="artistDao"/> <property name="methodNameResolver"> <bean class="org.springframework.web.servlet.mvc.multiaction.PropertiesMethodNameResolver"> <property name="alwaysUseFullPath" value="true"/> <property name="mappings"> <props> <prop key="/HelloWorld.Web">getAllArtists</prop> </props> </property> </bean> </property> </bean> I am using Spring 2.5.6 and Bea Weblogic Server 9.2

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• Intercepting method with Spring AOP using only annotations

  - by fish

  In my Spring context file I have something like this: <bean id="userCheck" class="a.b.c.UserExistsCheck"/> <aop:config> <aop:aspect ref="userCheck"> <aop:pointcut id="checkUser" expression="execution(* a.b.c.d.*.*(..)) &amp;&amp; args(a.b.c.d.RequestObject)"/> <aop:around pointcut-ref="checkUser" method="checkUser"/> </aop:aspect> </aop:config> a.b.c.UserExistsCheck looks like this: @Aspect public class UserExistsCheck { @Autowired private UserInformation userInformation; public Object checkUser(ProceedingJoinPoint pjp) throws Throwable { int userId = ... //get it from the RequestObject passed as a parameter if (userExists(userId)) { return pjp.proceed(); } else { return new ResponseObject("Invalid user); } } And the class that is being intercepted with this stuff looks like this: public class Klazz { public ResponseObject doSomething(RequestObject request) {...} } This works. UserExistCheck is executed as desired before the call is passed to Klazz. The problem is that this is the only way I got it working. To get this working by using annotations instead of the context file seems to be just too much for my small brain. So... how exactly should I annotate the methods in UserExistsCheck and Klazz? And do I still need something else too? Another class? Still something in the context file?

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• Extending spring based app

  - by pitr

  I have a spring-based Web Service. I now want to build a sort of plugin for it that extends it with beans. What I have now in web.xml is: <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/classes/*-configuration.xml</param-value> </context-param> My core app has main-configuration.xml which declares its beans. My plugin app has plugin-configuration.xml which declares additional beans. Now when I deploy, my build deploys plugin.jar into /WEB-INF/lib/ and copies plugin-configuration.xml into /WEB-INF/classes/ all under main.war. This is all fine (although I think there could be a better solution), but when I develop the plugin, I don't want to have two projects in Eclipse with dependencies. I wish to have main.jar that I include as a library. However, web.xml from main.jar isn't automatically discovered. How can I do this? Bean injection? Bean discovery of some sort? Something else? Note: I expect to have multiple different plugins in production, but development of each of them will be against pure main.jar Thank you.

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• spring3.0 mvc problem(The requested resource is not Available)

  - by Daniel

  Hi, I am a newbie for Spring MVC 3.0 and trying to write a sample webapp to get the feels of it. I am able to get url to invoke my associated controller, but not able to foward the request from which to my jsp resource as indicated by the output on the browser: The requested resource (/Spring30HelloWorld/helloworldcontroller) is not available. A word of suggestion on fixing the issue would be appreciated!! Please refer below for my code set up. Thanks in advance! web.xml (location: /WebContent) <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>Spring30HelloWorld</display-name> <servlet> <servlet-name>A</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>A</servlet-name> <url-pattern>*.htm</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.htm</welcome-file> </welcome-file-list> </web-app> A-servlet.xml (location: /WebContent/WEB-INF/) <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> <context:component-scan base-package="com.controller" /> </beans> HelloWorldController.java (location: /src/com/controller) package com.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.portlet.ModelAndView; @Controller public class HelloWorldController { @RequestMapping("/helloWorld" ) public ModelAndView sayHello() { System.out.println("hello!"); //return new ModelAndView("helloworld.jsp", "hello", "hello"); return new ModelAndView("helloworld.jsp"); } } helloworld.jsp (location: /WebContent/) <html> <head> <title>Hello World</title> </head> <body> <h1>Simple Spring 3.0 Web App</h1> <p></p> </body> </html>

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• Strage character encoding problem with Eclipse / Spring / Tomcat 6

  - by Czar

  Hi, I have been trying things all da but can't get a proper solution. My problem is: I am developing a Spring MVC based app in my local Tomcat. My MYSQl database has UTF-8 encoding set, all content in there displays properly when using phpMyAdmin. Also the output in LOG files using log4j in catalina.out works fine. My JSP pages are configured by <!-- encoding --> <%@ page contentType="text/html; charset=UTF-8" %> <%@ page pageEncoding="UTF-8" %> Also showing data on my JSP works fine. I can also send data from my Controller without any DB intereference using special chars, e.g. String str = "UTF-8 Test: Ä Ö Ü ß è é â"; logger.debug(str); mav.addObject("utftest", str); That displays correctly in log and on jsp page in browser. BUT: When having special chars directly in my JSP file, e.g. for text in headers, this does not work. FF and Google Chrome display strange chars but report the page to be UTF-8. When switching to Latin, the chars just get more and more strange. Same problem when showing text tokens from my messages.properties file, although Eclipse says when right-clicking that UTF-8 will be used. I am a little it lost and don't know where to check now. Summary: DB storage is fine DB output on JSP is fine Output on JSP directly form controller is fine even reading in form forms is fine .properties files and JSP text is not fine !!! Any ideas? I really appreciate and tips.

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• application-context.xml problem for Spring ActionScript

  - by jiri

  content of The application-content.xml is <?xml version="1.0" encoding="utf-8"?> <objects xmlns="http://www.springactionscript.org/schema/objects" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springactionscript.org/schema/objects http://www.springactionscript.org/schema/objects/spring-actionscript-objects-1.0.xsd"> <property file="strings.properties" /> <object id="string1" class="String"/> <object id="string2" class="String"/> <object id="nlslzf" class="com.sgb.model.MyClass"/> </objects> content of strings.properties is: s1=Firststring s2=Secondstring but error: Main Thread (Suspended: Error: An object definition for 'string1' was not found.) org.springextensions.actionscript.ioc.factory.support::AbstractObjectFactory/getObject SpringActionScript/test SpringActionScript/onCreationComplete SpringActionScript/___SpringActionScript_Application1_creationComplete flash.events::EventDispatcher/dispatchEventFunction [no source] mx.core::UIComponent/dispatchEvent mx.core::UIComponent/set initialized mx.managers::LayoutManager/doPhasedInstantiation Function/http://adobe.com/AS3/2006/builtin::apply [no source] mx.core::UIComponent/callLaterDispatcher2 mx.core::UIComponent/callLaterDispatcher2 mx.core::UIComponent/callLaterDispatcher i can run normal if removed the '' why it is? springactionscript bug?

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• Spring security with GAE

  - by xybrek

  I'm trying to implement Spring security for my GAE application however I'm getting this error: No bean named 'springSecurityFilterChain' is defined I added this configuration on my application web.xml: <filter> <filter-name>springSecurityFilterChain</filter-name> <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class> </filter> <filter-mapping> <filter-name>springSecurityFilterChain</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> And in the servlet-context: <!-- Configure security --> <security:http auto-config="true"> <security:intercept-url pattern="/**" access="ROLE_USER" /> </security:http> <security:authentication-manager alias="authenticationManager"> <security:authentication-provider> <security:user-service> <security:user name="jimi" password="jimi" authorities="ROLE_USER, ROLE_ADMIN" /> <security:user name="bob" password="bob" authorities="ROLE_USER" /> </security:user-service> </security:authentication-provider> </security:authentication-manager> What could be causing the error?

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• Spring security and authentication provider

  - by Pascal

  I'm trying to implement Spring 3 Security in a project, but I can not get rid of the following error: org.springframework.beans.factory.BeanCreationException: Error creating bean with name '_authenticationManager': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: No authentication providers were found in the application context This seems weird, as I did provide an authentication provider! I've added these lines to web. <filter> <filter-name>springSecurityFilterChain</filter-name> <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class> </filter> <filter-mapping> <filter-name>springSecurityFilterChain</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> And this is my applicationContext-security.xml: <http auto-config="false"> <intercept-url pattern="/**" access="ROLE_USER" /> <http-basic /> </http> <authentication-manager alias="authenticationManager"> <authentication-provider> <user-service> <user name="jimi" password="jimispassword" authorities="ROLE_USER, ROLE_ADMIN"/> <user name="bob" password="bobspassword" authorities="ROLE_USER"/> </user-service> </authentication-provider> </authentication-manager> Google couldn't help me much further, nor could the official documentation.

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• Spring MVC + Hibernate encoding problem

  - by Bar

  I work on Spring MVC + Hibernate application, use MySQL (ver. 5.0.51a) with the InnoDB engine. The problem appears when I am sending a form with cyrillic characters. As the result, database contains senseless chars in unknown encoding. All the JSP pages, database (+ tables and fields) created using UTF-8. Hibernate config also contains property which sets encoding to UTF-8. I had solved this by creating filter which encodes request content with UTF-8. Exemplary code: … encoding = "UTF-8"; request.setCharacterEncoding(encoding); chain.doFilter(request, response); … But it visibly slows down the app. The interesting thing is that executing insert query directly from the app (i.e. running from Eclipse as Java Application) works perfect. Any suggestions are welcome. TIA, Michael.

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• Spring URL mapping question

  - by es11

  I am using Java with Spring framework. Given the following url: www.mydomain.com/contentitem/234 I need to map all requests that come to /contentitem/{numeric value} mapped to a given controller with the "numeric value" passed as a parameter to the controller. Right now in my servlet container xml I have simple mappings similar to the following: ... <entry key="/index.html"> <ref bean="homeController" /> </entry> ... I am just wondering what I need to add to the mapping in order to achieve what I described? Edit: I unaccepted the answer temporarily because I can't seem to figure out how to do the mapping in my web.xml (I am using annotations as described in axtavt's answer below). How do I add a proper <url-pattern>..</url-pattern> in my <servlet-mapping> so that the request for "/contentitem/{numeric_value}" gets properly picked up? Thanks!

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• How to manually set an authenticated user in Spring Security / SpringMVC

  - by David Parks

  After a new user submits a 'New account' form, I want to manually log that user in so they don't have to login on the subsequent page. The normal form login page going through the spring security interceptor works just fine. In the new-account-form controller I am creating a UsernamePasswordAuthenticationToken and setting it in the SecurityContext manually: SecurityContextHolder.getContext().setAuthentication(authentication); On that same page I later check that the user is logged in with: SecurityContextHolder.getContext().getAuthentication().getAuthorities(); This returns the authorities I set earlier in the authentication. All is well. But when this same code is called on the very next page I load, the authentication token is just UserAnonymous. I'm not clear why it did not keep the authentication I set on the previous request. Any thoughts? Could it have to do with session ID's not being set up correctly? Is there something that is possibly overwriting my authentication somehow? Perhaps I just need another step to save the authentication? Or is there something I need to do to declare the authentication across the whole session rather than a single request somehow? Just looking for some thoughts that might help me see what's happening here.

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• upgrading to spring 3.0 problem with interceptorNames

  - by mkoryak

  I am trying to upgrade to Spring 3.0 and i have the following issues: Finding the dependencies. People recommend using maven, but id rather not try to learn how to use maven/install it if the jars are available somewhere for download. The following bean declaration is now longer valid but i dont know how to fix it: <bean id="service" class="org.springframework.aop.framework.ProxyFactoryBean"> <property name="proxyInterfaces" value="com.service.SomeService" /> <property name="target"> <bean class="com.service.SomeServiceImpl"> </bean> </property> <property name="interceptorNames"> <list> <value>hibernateInterceptor</value> </list> </property> </bean> The complaint is that <property name="interceptorNames"> is no longer supported and should be done some other way

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• Spring 3 MVC validation BindingResult doesn't contain any errors

  - by Travelsized

  I'm attempting to get a Spring 3.0.2 WebMVC project running with the new annotated validation support. I have a Hibernate entity annotated like this: @Entity @Table(name = "client") public class Client implements Serializable { private static final long serialVersionUID = 1L; @Id @Basic(optional = false) @Column(name = "clientId", nullable = false) @NotEmpty private Integer clientId; @Basic(optional = false) @Column(name = "firstname", nullable = false, length = 45) @NotEmpty @Size(min=2, max=45) private String firstname; ... more fields, getters and setters } I've turned on mvc annotation support in my applicationContext.xml file: <mvc:annotation-driven /> And I have a method in my controller that responds to a form submission: @RequestMapping(value="/addClient.htm") public String addClient(@ModelAttribute("client") @Valid Client client, BindingResult result) { if(result.hasErrors()) { return "addClient"; } service.storeClient(client); return "clientResult"; } When my app loads in the server, I can see in the server log file that it loads a validator: 15 [http-8084-2] INFO org.hibernate.validator.util.Version - Hibernate Validator 4.0.2.GA The problem I'm having is that the validator doesn't seem to kick in. I turned on the debugger, and when I get into the controller method, the BindingResult contains 0 errors after I submit an empty form. (The BindingResult does show that it contains the Client object as a target.) It then proceeds to insert a record without an Id and throws an exception. If I fill out an Id but leave the name blank, it creates a record with the Id and empty fields. What steps am I missing to get the validation working?

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• How to collect and inject all beans of a given type in Spring XML configuration

  - by GrzegorzOledzki

  One of the strongest accents of the Spring framework is the Dependency Injection concept. I understand one of the advices behind that is to separate general high-level mechanism from low-level details (as announced by Dependency Inversion Principle). Technically, that boils down to having a bean implementation to know as little as possible about a bean being injected as a dependency, e.g. public class PrintOutBean { private LogicBean logicBean; public void action() { System.out.println(logicBean.humanReadableDetails()); } //... } <bean class="PrintOutBean"> <property name="loginBean" ref="ShoppingCartBean"/> </bean> But what if I wanted to a have a high-level mechanism operating on multiple dependent beans? public class MenuManagementBean { private Collection<Option> options; public void printOut() { for (Option option:options) { // do something for option } //... } } I know one solution would be to use @Autowired annotation in the singleton bean, that is... @Autowired private Collection<Option> options; But doesn't it violate the separation principle? Why do I have to specify what dependents to take in the very same place I use them (i.e. MenuManagementBean class in my example)? Is there a way to inject collections of beans in the XML configuration like this (without any annotation in the MMB class)? <bean class="MenuManagementBean"> <property name="options"> <xxx:autowire by-type="MyOptionImpl"/> </property> </bean>

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