trying to get a Collection from my jsp

[KID]

Hi,
I try to get a collection from my jsp to my form bean. This is my code:

<nested:iterate property="prestationsComptage" >
<tr>
   <td>
        <nested:hidden property="idPrest" />
   </td>
   <td>
        <nested:write property="libellePrestationComptage"/>
    </td>
    <td>
        <nested:text property="nbUnites" />
    </td>
                                
</tr>
</nested:iterate>

and in my form bean:

private List prestationsComptage;

public List getPrestationsComptage() {
        return prestationsComptage;
}

        
public void setPrestationsComptage(List prestationsComptage) {
        this.prestationsComptage = prestationsComptage;
}

Each element of my list is an object with the 3 properties (idPrest,
libellePrestationComptage,  nbUnites).

when I try to get the collection, an exception is occured :

javax.servlet.ServletException: BeanUtils.populate
        at
net.sf.acegisecurity.intercept.web.SecurityEnforcementFilter.doFilter(SecurityEnforcementFilter.java:214)
        at
net.sf.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:303)
        at
net.sf.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:153)
        at
net.sf.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:303)
        at
net.sf.acegisecurity.wrapper.ContextHolderAwareRequestFilter.doFilter(ContextHolderAwareRequestFilter.java:50)
        at
net.sf.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:303)
        at
net.sf.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:226)
        at
net.sf.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:303)
        at
net.sf.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java:173)
        at
net.sf.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:125)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)

....

thank you for your assistance.
Kid


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