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https://issues.apache.org/jira/browse/TAP5-818?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thiago H. de Paula Figueiredo closed TAP5-818.
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Resolution: Won't Fix
Tapestry's prop binding uses class creation, not reflection, to get and set
values. As the type of T is not known until runtime, all Tapestry know is that
T is Object.
> JDK5 Generic is not supported by property chain
> -----------------------------------------------
>
> Key: TAP5-818
> URL: https://issues.apache.org/jira/browse/TAP5-818
> Project: Tapestry 5
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.1.0.5
> Environment: Tapestry 5.1.0.5
> JDK5
> Reporter: maxyu
>
> Below is the example
> KeyedObject.java:used to store string keyed object
> import java.util.*;
> import java.util.Map.Entry;
> public class KeyedObject<T> {
> private String key;
> private T value;
> public String getKey() {
> return key;
> }
> public void setKey(String key) {
> this.key = key;
> }
> public T getValue() {
> return value;
> }
> public void setValue(T value) {
> this.value = value;
> }
> }
> page java class:dbpools simply put BasicDataSource and its key name into a
> KeyObject list
> import java.util.Iterator;
> import java.util.LinkedList;
> import java.util.List;
> import java.util.Map;
> import java.util.Map.Entry;
> import org.apache.commons.dbcp.BasicDataSource;
> import org.apache.tapestry5.annotations.Property;
> import org.apache.tapestry5.ioc.annotations.Inject;
> import com.elite.predictob.EliteOBManagerProxy;
> import com.elite.predictob.KeyedObject;
> public class dbpools {
> @Inject
> private EliteOBManagerProxy proxy;
>
> @Property
> private KeyedObject<BasicDataSource> datasource;
>
> public List<KeyedObject<BasicDataSource>> getDatasources()
> {
> Map dbmap=proxy.getManager().getDataSources();
> synchronized (dbmap) {
> List<KeyedObject<BasicDataSource>> list=new
> LinkedList<KeyedObject<BasicDataSource>>();
> Iterator<Entry<String,BasicDataSource>>
> it=dbmap.entrySet().iterator();
> while(it.hasNext()){
> Entry<String,BasicDataSource> entry=it.next();
> KeyedObject<BasicDataSource> obj=new
> KeyedObject<BasicDataSource>();
> obj.setKey(entry.getKey());
> obj.setValue(entry.getValue());
> list.add(obj);
> }
> return list;
> }
> }
> }
> page template:
> <html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd";
> xmlns:p="tapestry:parameter"
> xmlns:cl="cl">
> <head>
> <t:elite.cachecontrol.cachecontrol/>
> <title>${message:dbpoolconfig}</title>
> </head>
> <body>
> <table border="1">
> <tr t:type="loop" t:element="tr" t:source="datasources"
> value="datasource">
>
> <td>${datasource.key}</td><td>${datasource.value.numActive}</td>
> </tr>
> </table>
> </body>
> </html>
> ${datasource.value.numActive} will cause following error:
> Could not convert 'datasource.value.numActive' into a component parameter
> binding: Class java.lang.Object does not contain a property named 'numActive'
> (within property expression 'datasource.value.numActive'). Available
> properties: class.
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