Hi William,
On Wed, 2005-01-19 at 02:49 -0600, William Fuller wrote:
> Hello, I'm new to Digester, Tomcat, Servlet, Velocity, and even Java...
> Yup, one of those.
No worries, we've all been there..
>
> I am running into a spot of bother while using Digester to parse my XML file
> that I will ultimately pluck from Derby. The file starts out like this:
>
>
> <Screen>
> <ScreenID>3220D03D-59F7-49ca-86AE-E97B7427BA7B</ScreenID>
> <Lifetime_ms>20000</Lifetime_ms>
> <BugItem>
> <ImageURL>cnn001.jpg</ImageURL>
> ...
>
> It is a rather large file with many Vectors and I parse it just fine so long
> as all the setMethods are of type String. I am using XML Rules and my file
> looks like this:
>
> <?xml version="1.0"?>
>
> <digester-rules>
> <pattern value="Screen">
> <object-create-rule classname="com.synergy.screendoc.ScreenDocument"
> />
> <call-method-rule pattern="ScreenID" methodname="setScreenID"
> paramcount="0" />
> <call-method-rule pattern="Lifetime_ms" methodname="setLifetime_ms"
> paramcount="0" />
> ...
>
> My Java bean for the first level looks like this:
>
> public class ScreenDocument
> {
> public String ScreenID;
> public String Lifetime_ms;
> public Vector BugItem;
> public Vector StaticTextItem;
> public Vector DynamicTextItem;
>
> public ScreenDocument()
> {
> BugItem = new Vector();
> StaticTextItem = new Vector();
> DynamicTextItem = new Vector();
> }
>
> public String getScreenID() { return ScreenID; }
> public void setScreenID( String rhs ) { this.ScreenID = rhs; }
> public String getLifetime_ms() { return Lifetime_ms; }
> public void setLifetime_ms( String rhs ) { this.Lifetime_ms = rhs; }
> ...
If I understand your problem, your issue is that this works when
property Lifetime_ms is a String, but you want it to be an int or
Integer?
Well, this should just work. Digester uses BeanUtils to access
properties of a Java object, and this automatically does type
conversions. From inspection of the target ScreenDocument class,
BeanUtils should see that there is a setScreenID(int rhs) method, and so
automatically convert String->int before invoking that method. If the
getter/setter deal in Integer rather than int, then that should work
too.
A few suggestions:
(a) Did you change the prototype of the getScreenID method to return the
same datatype as the setScreenID takes as a parameter? This is required
by the JavaBean standard...
(b) If you're still having problems then you can try enabling debugging
in Digester. See http://wiki.apache.org/jakarta-commons/Digester/FAQ
section 1.4.
>
> The problem that I am encountering is that if I try to use
> bean-property-setter-rule like this:
>
> <?xml version="1.0"?>
>
> <digester-rules>
> <pattern value="Screen">
> <object-create-rule classname="com.synergy.screendoc.ScreenDocument"
> />
> <set-properties-rule/>
> <bean-property-setter-rule pattern="ScreenID"/>
> <bean-property-setter-rule pattern="Lifetime_ms"/>
>
> I get the Digester exception that the bean has no property ScreenID.
>
> Having a method that works I would normally just blow this off, but I don't
> really want Lifetime_ms to be a String, I want it to be an "int". I would
> be happy with it being a java.lang.Integer, but when I do something like
> this:
>
> <?xml version="1.0"?>
>
> <digester-rules>
> <pattern value="Screen">
> <object-create-rule classname="com.synergy.screendoc.ScreenDocument"
> />
> <call-method-rule pattern="ScreenID" methodname="setScreenID"
> paramcount="0" />
> <pattern value="Lifetime_ms">
> <call-method-rule methodname="setLifetime_ms" paramcount="1"/>
> <object-param-rule paramnumber='0' type="java.lang.Integer" />
> </pattern>
> ...
>
> And change the bean to have Lifetime_ms defined, set, and returned as type
> Integer, Digester throws and exception and complains that setLifetime_ms is
> not defined in my class.
>
> I am at a loss for understanding why I am having this problem and suspect I
> am doing something really dumb.
>
> Can anyone please set me staight?
I'm puzzled as well. It should all work. The only thing that I can think
of is that you failed to change the getter method [as described in (a)
above].
If this isn't the case, then please enable debugging and have a look at
the output. If this still doesn't help, then post the debug output to
this list and maybe I (or someone else) can help further.
Regards,
Simon
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