I wish to remove all model extents from the MDR. I do this 
as follows:
- Use MDRepository.getExtentNames() to get an array of 
extent names from the MDR.
- For each of these extent names I try to get the extent 
using MDRepository.getExtent(String) to get a RefPackage 
object
- On each RefPackage object I execute refDelete()

This works fine on some extents, but throws an exception 
on others. It seems that not all extent names returned 
from getExtentNames() are valid i.e. some of the names are 
stale and have no representation in the underlying MDR 
storage. All extent names have been created somewhere 
earlier in processing, but there may not be any valid java 
references to these extents at the time of exception.
The extents that do delete propertly either have a 
reference within the executing class, or a static 
reference in another class. (Is this a problem with 
garbage collection of extents references?)



Test Code fragment
==================
System.out.println("MdrApmlPackageManager: 
testCleanPackages()");
String[] packageNames = repository.getExtentNames();
for (int i=0;i<packageNames.length; i++) {
  System.out.println("Package Name:" + packageNames[i]);
}
System.out.println("Number of packages to delete: " + 
packageNames.length);
for (int i=0;i<packageNames.length;i++) {
  System.out.println("Deleting package: " + packageNames
[i]);
  repository.getExtent(packageNames[i]).refDelete();
}

Exception raised
================

     [java]     [junit] MdrApmlPackageManager: 
testCleanPackages()
     [java]     [junit] Package Name:testPopulateModel
     [java]     [junit] Package Name:MyModel
     [java]     [junit] Package Name:testCreateModel
     [java]     [junit] Package Name:testModel
     [java]     [junit] Package Name:testGetModel
     [java]     [junit] Package Name:LoadedModel
     [java]     [junit] Number of packages to delete: 6
     [java]     [junit] Deleting package: testPopulateModel
     [java]     [junit] Deleting package: MyModel
     [java]     [junit] 
org.netbeans.mdr.util.DebugException: Exception: No reco
rd exists with key 5E432679-AA6E-11D6-9749-
2264B1C6AA77:0000000000005AE0
     [java]     [junit]         at 
org.netbeans.mdr.storagemodel.StorableFeature
d.read(StorableFeatured.java:217)
     [java]     [junit]         at 
org.netbeans.mdr.storagemodel.StorableObject.
read(StorableObject.java:284)
     [java]     [junit]         at 
org.netbeans.mdr.persistence.btreeimpl.btrees
torage.BtreeDatabase.getRecord(BtreeDatabase.java:969)
     [java]     [junit]         at 
org.netbeans.mdr.persistence.btreeimpl.btrees
torage.BtreeDatabase.getIfExists(BtreeDatabase.java:720)
     [java]     [junit]         at 
org.netbeans.mdr.persistence.btreeimpl.btrees
torage.BtreeDatabase.getIfExists(BtreeDatabase.java:700)
     [java]     [junit]         at 
org.netbeans.mdr.persistence.btreeimpl.btreei
ndex.MOFIDInfo.objectFromBuffer(MOFIDInfo.java:102)
     [java]     [junit]         at 
org.netbeans.mdr.persistence.btreeimpl.btreei
ndex.BtreeListByKey$BtreeListByKeyIterator.getCurrentItem
(BtreeListByKey.java:19
7)
     [java]     [junit]         at 
org.netbeans.mdr.persistence.btreeimpl.btreei
ndex.BtreeListByKey$BtreeListByKeyIterator.next
(BtreeListByKey.java:128)
     [java]     [junit]         at 
java.util.AbstractCollection.toArray(Abstract
Collection.java:170)
     [java]     [junit]         at 
org.netbeans.mdr.storagemodel.IndexImmutSet.t
oArray(IndexImmutSet.java:74)
     [java]     [junit]         at 
java.util.ArrayList.<init>(ArrayList.java:132
)
     [java]     [junit]         at 
org.netbeans.mdr.storagemodel.StorableClass.d
eleteRecursive(StorableClass.java:357)
     [java]     [junit]         at 
org.netbeans.mdr.storagemodel.StorablePackage
.deleteRecursive(StorablePackage.java:165)
     [java]     [junit]         at 
org.netbeans.mdr.storagemodel.StorablePackage
.delete(StorablePackage.java:145)
     [java]     [junit]         at 
org.netbeans.mdr.handlers.PackageProxyHandler
.refDelete(PackageProxyHandler.java:315)
     [java]     [junit]         at 
net.agentis.jmi.apml.mdr.MdrApmlPackageManage
r_Test.testCleanPackages
(MdrApmlPackageManager_Test.java:115)
     [java]     [junit]         at 
sun.reflect.NativeMethodAccessorImpl.invoke0(
Native Method)
     [java]     [junit]         at 
sun.reflect.NativeMethodAccessorImpl.invoke(N
ativeMethodAccessorImpl.java:39)
     [java]     [junit]         at 
sun.reflect.DelegatingMethodAccessorImpl.invo
ke(DelegatingMethodAccessorImpl.java:25)
     [java]     [junit]         at 
java.lang.reflect.Method.invoke(Method.java:3
24)
     [java]     [junit]         at 
junit.framework.TestCase.runTest(TestCase.jav
a:166)
     [java]     [junit]         at 
junit.framework.TestCase.runBare(TestCase.jav
a:140)
     [java]     [junit]         at 
junit.framework.TestResult$1.protect(TestResu
lt.java:106)
     [java]     [junit]         at 
junit.framework.TestResult.runProtected(TestR
esult.java:124)
     [java]     [junit]         at 
junit.framework.TestResult.run(TestResult.jav
a:109)
     [java]     [junit]         at 
junit.framework.TestCase.run(TestCase.java:13
1)
     [java]     [junit]         at 
junit.framework.TestSuite.runTest(TestSuite.j
ava:173)
     [java]     [junit]         at 
junit.framework.TestSuite.run(TestSuite.java:
168)
     [java]     [junit]         at 
org.apache.tools.ant.taskdefs.optional.junit.
JUnitTestRunner.run(JUnitTestRunner.java:231)
     [java]     [junit]         at 
org.apache.tools.ant.taskdefs.optional.junit.
JUnitTask.executeInVM(JUnitTask.java:582)
     [java]     [junit]         at 
org.apache.tools.ant.taskdefs.optional.junit.
JUnitTask.execute(JUnitTask.java:403)
     [java]     [junit]         at 
org.apache.tools.ant.taskdefs.optional.junit.
JUnitTask.execute(JUnitTask.java:380)
     [java]     [junit]         at 
org.apache.tools.ant.Task.perform(Task.java:2
17)
     [java]     [junit]         at 
org.apache.tools.ant.Target.execute(Target.ja
va:184)
     [java]     [junit]         at 
org.apache.tools.ant.Target.performTasks(Targ
et.java:202)
     [java]     [junit]         at 
org.apache.tools.ant.Project.executeTarget(Pr
oject.java:601)
     [java]     [junit]         at 
org.apache.tools.ant.Project.executeTargets(P
roject.java:560)
     [java]     [junit]         at 
org.apache.tools.ant.Main.runBuild(Main.java:
454)
     [java]     [junit]         at 
org.apache.tools.ant.Main.start(Main.java:153
)
     [java]     [junit]         at 
org.apache.tools.ant.Main.main(Main.java:176)

     [java]     [junit] rolled back!