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From "Sweetland, Jesse" <JSweetl...@talk.com>
Subject [Betwixt] Unmarshalling Collections
Date Thu, 31 Aug 2006 19:17:47 GMT
I'm getting "Could not create instance of type: java.util.Set" errors when I
try to unmarshal an XML document.  Here is the stack trace:

java.lang.InstantiationException: java.util.Set
	at java.lang.Class.newInstance0(Class.java:335)
	at java.lang.Class.newInstance(Class.java:303)
	at
org.apache.commons.betwixt.io.read.ChainedBeanCreatorFactory$2.create(Chaine
dBeanCreatorFactory.java:115)
	at
org.apache.commons.betwixt.io.read.BeanCreationList$ChainWorker.create(BeanC
reationList.java:128)
	at
org.apache.commons.betwixt.io.read.ChainedBeanCreatorFactory$1.create(Chaine
dBeanCreatorFactory.java:62)
	at
org.apache.commons.betwixt.io.read.BeanCreationList$ChainWorker.create(BeanC
reationList.java:128)
	at
org.apache.commons.betwixt.io.read.ChainedBeanCreatorFactory$3.create(Chaine
dBeanCreatorFactory.java:160)
	at
org.apache.commons.betwixt.io.read.BeanCreationList$ChainWorker.create(BeanC
reationList.java:128)
	at
org.apache.commons.betwixt.io.read.BeanCreationList.create(BeanCreationList.
java:68)
	at
org.apache.commons.betwixt.io.read.BeanBindAction.createBean(BeanBindAction.
java:209)
	at
org.apache.commons.betwixt.io.read.BeanBindAction.begin(BeanBindAction.java:
71)
	at
org.apache.commons.betwixt.io.BeanRuleSet$ActionMappingRule.nextAction(BeanR
uleSet.java:286)
	at
org.apache.commons.betwixt.io.BeanRuleSet$ActionMappingRule.begin(BeanRuleSe
t.java:255)
	at
org.apache.commons.digester.Digester.startElement(Digester.java:1273)
	at
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Ab
stractSAXParser.java:533)
	at
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanS
tartElement(XMLDocumentFragmentScannerImpl.java:878)
	at
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$Fragm
entContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1693)
	at
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanD
ocument(XMLDocumentFragmentScannerImpl.java:368)
	at
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Con
figuration.java:834)
	at
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Con
figuration.java:764)
	at
com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:14
8)
	at
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractS
AXParser.java:1242)
	at org.apache.commons.digester.Digester.parse(Digester.java:1586)
	at
com.talk.domain.betwixt.BetwixtHelper.unmarshal(BetwixtHelper.java:70)
	at
com.talk.domain.betwixt.BetwixtHelper.unmarshal(BetwixtHelper.java:49)
	at
com.talk.domain.betwixt.test.CreateOrderRequestTest.unmarshal(CreateOrderReq
uestTest.java:67)
	at
com.talk.domain.betwixt.test.CreateOrderRequestTest.testConsumeCreateOrderRe
quest(CreateOrderRequestTest.java:98)
	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:585)
	at junit.framework.TestCase.runTest(TestCase.java:154)
	at junit.framework.TestCase.runBare(TestCase.java:127)
	at junit.framework.TestResult$1.protect(TestResult.java:106)
	at junit.framework.TestResult.runProtected(TestResult.java:124)
	at junit.framework.TestResult.run(TestResult.java:109)
	at junit.framework.TestCase.run(TestCase.java:118)
	at junit.framework.TestSuite.runTest(TestSuite.java:208)
	at junit.framework.TestSuite.run(TestSuite.java:203)
	at
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRu
nner.java:297)
	at
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTes
tRunner.java:672)
	at
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestR
unner.java:567)

I have an Customer class that contains a java.util.Set of Account classes.
The XML, mappings, and classes look like this

XML:
<cust>
	<accts>
		<acct> ... </acct>
		<acct> ... </acct>
	</accts>
</cust>

Customer.betwixt:
<?xml version="1.0"?>
<info>
	<element name="cust">
		<element name="accts">
			<element name="acct" property="accts"/>
		</element>
	</element>
</info>

Customer.java:
public class Customer {
	private Set<Account> _accounts = new LinkedHashSet<Account>();
	public Set<Account> getAccounts() { return _accounts; }
	public void setAccounts(Set<Account> accounts) { _accounts =
accounts; }
}

I have tried to make a custom bean creation chain that will instantiate
java.util.LinkedHashSet when the bean type is java.util.Set.  The error goes
away, but the collection is not populated.  I looked through the source code
and it looks like isCollective() is never called when reading XML.  Is this
a bug, or am I doing something wrong?

Thanks,

- Jesse

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