Spring-MVC forms on GAE

Question

I am trying to create a form using the Spring Framework, but according to this (http://groups.google.com/group/google-appengine-java/ browse_thread/thread/d93fd7385bf85bf7), I need to override initBinder. Well, I think I did that and it still doesn't work.

My jsp (priceincreasejsp):

<%@ page contentType="text/html;charset=UTF-8" language="java"
isELIgnored="false" session="false" %>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/
form" %>
<form:form method="post" commandName="priceIncrease">
   Increase (%): <form:input path="percentage"/>
  <input type="submit" value="Execute">
</form:form>

myapp-servlet.xml has the following:

<bean name="/priceincrease.htm"
class="myapp.web.PriceIncreaseFormController">
   <property name="sessionForm" value="true"/>
   <property name="commandName" value="priceIncrease"/>
   <property name="commandClass" value="myapp.service.PriceIncrease"/
>
   <property name="validator">
       <bean class="myapp.service.PriceIncreaseValidator"/>
   </property>
   <property name="formView" value="priceincrease"/>
   <property name="successView" value="success.htm"/>
   <property name="productManager" ref="productManager" />
</bean>

PriceIncrease.java:

public class PriceIncrease implements Serializable {
    private Integer percentage;

    public void setPercentage(Integer i) {
        percentage = i;
    }

    public Integer getPercentage() {
        return percentage;
    }
}

PriceIncreaseFormController.java:

public class PriceIncreaseFormController extends SimpleFormController
{
   private ProductManager productManager;

   public ModelAndView onSubmit(Object command)  throws
ServletException {
       PriceIncrease priceIncrease = (PriceIncrease) command;
       Integer increase = priceIncrease.getPercentage();
       productManager.increasePrice(increase);
       return new ModelAndView(new RedirectView(getSuccessView()));
   }

   public void initBinder(WebDataBinder binder, WebRequest request)
{
       binder.registerCustomEditor(PriceIncrease.class, new
PriceIncreaseEditor());
       binder.registerCustomEditor(Integer.class, 
           new CustomNumberEditor(Integer.class, true)); // use this instead?
   }

   public void setProductManager() {...}
   public ProductManager getProductManager {...}
}

Finally, PriceIncreaseEditor.java: (this is probably wrong..)

public class PriceIncreaseEditor extends PropertyEditorSupport{

   @Override
   public void setAsText(String text) throws IllegalArgumentException
{
       Integer increase = new Integer(text);
       super.setValue(increase);
   }
}

Stack trace:

org.springframework.web.servlet.tags.RequestContextAwareTag
doStartTag: access denied (java.lang.RuntimePermission getClassLoader)
java.security.AccessControlException: access denied
(java.lang.RuntimePermission getClassLoader)
       at
java.security.AccessControlContext.checkPermission(AccessControlContext.java:
355)
       at
java.security.AccessController.checkPermission(AccessController.java:
567)
       at java.lang.SecurityManager.checkPermission(SecurityManager.java:
549)
       at
com.google.apphosting.runtime.security.CustomSecurityManager.checkPermission(CustomSecurityManager.java:
45)
       at java.lang.ClassLoader.getSystemClassLoader(ClassLoader.java:1311)
       at
org.springframework.beans.BeanUtils.findEditorByConvention(BeanUtils.java:
368)
       at
org.springframework.validation.AbstractPropertyBindingResult.getCustomEditor(AbstractPropertyBindingResult.java:
110)
       at
org.springframework.validation.AbstractPropertyBindingResult.formatFieldValue(AbstractPropertyBindingResult.java:
87)
       at
org.springframework.validation.AbstractBindingResult.getFieldValue(AbstractBindingResult.java:
230)
       at
org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:
120)
       at
org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:
172)
       at
org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:
192)
       at
org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:
158)
       at
org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.autogenerateId(AbstractDataBoundFormElementTag.java:
145)
       at
org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.resolveId(AbstractDataBoundFormElementTag.java:
136)
       at
org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes(AbstractDataBoundFormElementTag.java:
120)
       at
org.springframework.web.servlet.tags.form.AbstractHtmlElementTag.writeDefaultAttributes(AbstractHtmlElementTag.java:
379)
       at
org.springframework.web.servlet.tags.form.InputTag.writeTagContent(InputTag.java:
139)
       at
org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:
90)
       at
org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:
77)
       at
org.apache.jsp.WEB_002dINF.jsp.priceincrease_jsp._jspx_meth_form_005finput_005f0(priceincrease_jsp.java:
149)
       at
org.apache.jsp.WEB_002dINF.jsp.priceincrease_jsp._jspService(priceincrease_jsp.java:
82)
       at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
       at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
511)
       at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
390)
       at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
216)
       at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
182)
       at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
765)
       at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
418)
       at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:327)
       at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)
       at
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:
240)
       at
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:
258)
       at
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:
1174)
       at
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:
901)
       at
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:
809)
       at
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:
571)
       at
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:
501)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
       at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
511)
       at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1166)
       at
com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:
97)
       at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
       at
com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:
35)
       at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
       at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:
43)
       at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
       at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
388)
       at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
216)
       at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
182)
       at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
765)
       at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
418)
       at
com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:
238)
       at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
       at org.mortbay.jetty.Server.handle(Server.java:326)
       at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
542)
       at org.mortbay.jetty.HttpConnection
$RequestHandler.headerComplete(HttpConnection.java:923)
       at
com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:
76)
       at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
       at
com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:
135)
       at
com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:
261)
       at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$6.handleBlockingRequest(RuntimePb.java:8495)
       at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$6.handleBlockingRequest(RuntimePb.java:8493)
       at
com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest(BlockingApplicationHandler.java:
24)
       at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:
435)
       at com.google.net.rpc.impl.Server$RpcTask.runInContext(Server.java:
572)
       at com.google.tracing.TraceContext$TraceContextRunnable
$1.run(TraceContext.java:448)
       at com.google.tracing.TraceContext.runInContext(TraceContext.java:
688)
       at com.google.tracing.TraceContext
$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:
326)
       at com.google.tracing.TraceContext
$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:
318)
       at com.google.tracing.TraceContext
$TraceContextRunnable.run(TraceContext.java:446)
       at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:
1110)
       at java.util.concurrent.ThreadPoolExecutor
$Worker.run(ThreadPoolExecutor.java:603)
       at java.lang.Thread.run(Thread.java:636)

I've been pretty stuck for a while now... Any ideas?

Answer 1

SimpleFormController.initBinder() takes (HttpServletRequest request, ServletRequestDataBinder binder) while your initBinder() takes arguments in the opposite order.

So you haven't overridden it. Try switching the order of your arguments. And whenever you intend to override anything, put @Override on it so that the compiler can catch mistakes like this one for you.