This is what my action form looks like. You can ignore the LinkedHashMap and
use a regular HashMap. The only difference really is that I use the 'this.'
notation to access the local Map.
Basically, I have a single Map that has accessor methods to get/set
individual properties and I have accessor methods to get/set the whole Map.
ValidatorActionForm
...
protected LinkedHashMap fields = new LinkedHashMap();
...
/**
* Returns the field.
* @return Object
*/
public Object getField(String key) {
return fields.get(key);
}
/**
* Method setField.
* @param key
* @param value
*/
public void setField(String key, Object value) {
this.fields.put(key,value);
}
/**
* Method getFields.
* @return Map
*/
public LinkedHashMap getFields() {
return fields;
}
/**
* Sets the fields.
* @param fields The fields to set
*/
public void setFields(LinkedHashMap fields) {
this.fields = fields;
}
...
My jsp tag property looks like the following:
<html:text property="fields(phoneAreaCode)" size="24"/>
My validation.xml looks like the following:
<form-validation>
<formset>
<form name="/contact/send">
...
<field property="fields(phoneAreaCode)"
depends="integer,minlength">
<arg0 key="${var:field}"
resource="false"/>
<arg1 name="minlength"
key="${var:minlength}"
resource="false"/>
<var>
<var-name>field</var-name>
<var-value>Area Code</var-value>
</var>
<var>
<var-name>minlength</var-name>
<var-value>3</var-value>
</var>
</field>
...
</form>
</formset>
</form-validation>
It works like a champ.
Brandon Goodin
Phase Web and Multimedia
PO Box 85
Whitefish MT 59937
P (406) 862-2245
F (406) 862-0354
[EMAIL PROTECTED]
http://www.phase.ws
-----Original Message-----
From: Ken Boss [mailto:[EMAIL PROTECTED]
Sent: Saturday, February 22, 2003 5:39 PM
To: [EMAIL PROTECTED]
Subject: Using Map in ActionForm (ValidatorForm)
The book forum for "Struts in Action" appears to be down, so thought I'd
try here. Apologies if you don't have the book.
I am attempting to use a map in my form bean to pass data back and forth
from my business tier, as described on pp. 172-173 in "Struts in
Action". The code within the form bean is exactly as shown on p. 172,
excepting that I added a couple of lines to the setValue method so that
it reads:
public void setValue(String key, Object value) {
if (key != null && value != null) {
getMap().put(key,value);
}
}
When retrieving data from the database, the map comes in from the action
and populates the form widgets on my jsp page without difficulty.
However, when I try to submit the page to send the data back, I get a
NullPointerException from the setValue method:
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at
org.apache.commons.beanutils.PropertyUtils.setMappedProperty(PropertyUtils.j
ava:1583)
... >< snip >< ...
Caused by: java.lang.NullPointerException
at
us.mn.state.dnr.fire.FireReportForm.setValue(FireReportForm.java:270)
... 44 more
The line referred to (FireReportForm.java:270) is the
"getMap().put(key,value)" statement.
I've tried another reader's suggestion of changing
private Map map = null;
to
private Map map = new HashMap();
which gets past the NullPointerException, but then triggers a validator
error for a simple "required" field, which actually shows data in the
form.
Can anyone clue me in as to what I might be doing wrong?
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