Hi All,
I have a weird error on a Listing JSP that's had me stumped for several hours.
I have a POJO named "Product" and have built associated ProductDao,
ProductDaoHibernate, ProductManager, ProductManagerImpl
and ProductAction classes, as well as tests for Dao, Manager and Action.
I have a ProductList.jsp and I believe I've correctly configured all the "glue"
bits (bean defninitions in applicationContext.xml, action
definitions in struts.xml etc.).
All tests pass OK and the web app starts up (Jetty + HSQLDB).
However, when I go to view my products list, I get a blank page and the
following error:
[myapp] WARN [btpool0-1] LookupUtil.<init>(99) | Exception: [.LookupUtil] Error
looking up property "id" in object type
"java.lang.String". Cause: Unknown property 'id'
java.lang.NoSuchMethodException: Unknown property 'id'
at
org.apache.commons.beanutils.PropertyUtilsBean.getSimpleProperty(PropertyUtilsBean.java:1122)
at
org.apache.commons.beanutils.PropertyUtils.getSimpleProperty(PropertyUtils.java:408)
at org.displaytag.util.LookupUtil.getProperty(LookupUtil.java:271)
at org.displaytag.util.LookupUtil.getBeanProperty(LookupUtil.java:129)
at org.displaytag.model.Column.getValue(Column.java:124)
at
org.displaytag.model.Column.createChoppedAndLinkedValue(Column.java:201)
at org.displaytag.model.Column.initialize(Column.java:178)
at
org.displaytag.render.TableWriterTemplate.writeTableBody(TableWriterTemplate.java:313)
at
org.displaytag.render.TableWriterTemplate.writeTable(TableWriterTemplate.java:138)
at
org.displaytag.render.HtmlTableWriter.writeTable(HtmlTableWriter.java:643)
at org.displaytag.tags.TableTag.writeHTMLData(TableTag.java:1557)
at org.displaytag.tags.TableTag.doEndTag(TableTag.java:1206)
at
org.apache.jsp.WEB_002dINF.pages.admin.productList_jsp._jspService(org.apache.jsp.WEB_002dINF.pages.admin.productList_jsp:
206)
<.. lots more ..>
Unfortunately, at no point does the stacktrace drop into any of my own classes,
nor do any of my debug messages appear.
The following snippet is from my ProductList.jsp:
<c:set var="products" value="products" scope="request"/>
<display:table name="products" class="table" requestURI="" id="productList"
export="true" pagesize="25">
<display:column property="id" sortable="true" href="editProduct.html"
media="html"
paramId="id" paramProperty="id" titleKey="product.id"/>
<display:column property="id" media="csv excel xml pdf"
titleKey="product.id"/>
<display:column property="name" sortable="true"
titleKey="product.name"/>
<.. lots more ..>
My initial interpretation of the error message is that the "products" list
being returned by the c:set line in the jsp is actually coming in as
a list of strings and the server is complaining that the first String doesn't
contain an ID (which it wouldn't of course). However, I've been
back through my classes and the relevant methods are definitely returning
List<Product>.
The first line of my ProductAction.list() method is a log.debug call that never
prints to the log so I'm at a loss to figure out what's going
on.
Has anyone else seen anything like this before? Any thoughts on what might be
causing this problem, or where I should look?
TIA,
Rob Hills
Waikiki, Western Australia
Mobile +61 (412) 904-357
Fax: +61 (8) 9529-2137
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