Hello,
I have implemented a custom component to display (Blob) images. While it
works without a problem inside BeanEditForm and BeanDisplay, inside a Grid a
NullPointerException occurs while trying to pass a property of the actual
object (row) at the grid as a parameter to the component.
The relevant parts of the code:
Image.java (component)
******************
public class Image
{
...
@Parameter
private Blob data;
public Link getSrc()
{
return resources.createEventLink("displayImage", new Object[]{});
}
StreamResponse onDisplayImage()
{
return new StreamResponse() {
public String getContentType()
{
return "image/jpeg";
}
public InputStream getStream() throws IOException
{
try {
return data.getBinaryStream();
}
catch (SQLException e) {
throw new IllegalArgumentException(e);
}
}
public void prepareResponse(Response response)
{
}
};
}
}
Image.tml
*******
<html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";>
< img ... src="${src}"...>
</html>
Edit.tml (page)
***********
...
<t:beaneditform t:id="BookEdit" object="book" model="model"
...
<t:parameter name="mediumImage">
<t:image id="literal:book-image-register"
t:alt="literal:bookImage"
t:data="book.mediumImage"/>
</t:parameter>
...
</t:beaneditform>
...
In this page (Edit.tml) there is no problem, and the mediumImage of the book
is passed successfully to the Image component, and displayed. However,
below...
Search.tml (page)
*************
...
<t:grid t:id="BookEdit" t:source="books" row="book" model="model"
...
<t:parameter name="smallImageCell">
<t:image id="literal:book-image-register"
t:alt="literal:bookImage"
t:data="book.smallImage"/>
</t:parameter>
<t:parameter name="titleCell">
<t:pageLink t:page="detail"
context="book.id">${book.title}</t:pageLink>
</t:parameter>
<t:parameter name="authorsCell">
<t:loop source="book.authors" value="author">
<div>* ${author.name}</div>
</t:loop>
</t:parameter>
</t:grid>
...
Here (Search.tml), inside the Grid, always NullPointerException is thrown
with the message: "Property 'book' is null in (book.smallImage)". While
there is no problem with the "book.id", "book.title", "book.authors"...
Might this be somehow a problem in tapestry, or am I missing sth. (which is
perhaps more probable)?
Thanks a lot,
iren
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