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From Chris Davis <chr...@biomedcentral.com>
Subject Introspection and Enums
Date Tue, 22 Jul 2003 10:16:16 GMT
Hi,

What I want to do is to populate an object which has a number of simple set
methods taking String, ints etc.
It also has a setStatus(JournalStatusEnum) method which takes an object of a
specific class: in this case a JournalStatusEnum.

The JournalStatusEnum has a private constructor and holds a singleton
instance of each of the different possible status values. These instances
are got using the getInstance(String) method.

I'm encoding this in the source property name as "status.instance", but it
is causing a problem:

java.lang.IllegalArgumentException: Null property value for 'status'
	at
org.apache.commons.beanutils.PropertyUtils.getPropertyDescriptor(PropertyUti
ls.java:864)
	at
org.apache.commons.beanutils.PropertyUtils.isWriteable(PropertyUtils.java:12
88)
	at
org.apache.commons.beanutils.BeanUtils.copyProperties(BeanUtils.java:237)
	at
com.biomedcentral.noddy.integration.oracledao.OracleJournalVolumesDAO.search
ForJournalVolumes(OracleJournalVolumesDAO.java:330)
	at
com.biomedcentral.noddy.integration.oracledao.OracleJournalVolumesDAO.search
(OracleJournalVolumesDAO.java:135)
	at
com.biomedcentral.noddy.datatool.test.bmc.BMCSearchJournalVolumesTest.testSe
archJournalVolumesNormal(BMCSearchJournalVolumesTest.java:48)
	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 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.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRu
nner.java:392)
	at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.
java:276)
	at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner
.java:167)

I'm not actually sure whether this is possible, as I can't find details of
introspection which takes this form.

Any suggestions would be very useful,

Thanks in advance for your help,

Chris

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