Dynamic Tasklist broken with JDK6

Dynamic Tasklist is broken with JDK6. When you return to the page with the tasklist, you receive:

com.thoughtworks.xstream.converters.ConversionException: Invalid final field java.util.Collections$SynchronizedCollection.c

---- Debugging information ----

message : Invalid final field java.util.Collections$SynchronizedCollection.c

line number : 10

path : /com.atlassian.confluence.extra.dynamictasklist.model.TaskList/tasks/java.util.Collections-SynchronizedCollection/default/c

cause-message : Invalid final field java.util.Collections$SynchronizedCollection.c

class : com.atlassian.confluence.extra.dynamictasklist.model.TaskList

cause-exception : com.thoughtworks.xstream.converters.reflection.ObjectAccessException

required-type : java.util.Collections$SynchronizedRandomAccessList

-------------------------------

at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:45)

at com.thoughtworks.xstream.core.ReferenceByXPathUnmarshaller.convertAnother(ReferenceByXPathUnmarshaller.java:39)

at com.thoughtworks.xstream.converters.reflection.ReflectionConverter.unmarshal(ReflectionConverter.java:100)

at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:38)

at com.thoughtworks.xstream.core.ReferenceByXPathUnmarshaller.convertAnother(ReferenceByXPathUnmarshaller.java:39)

at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:99)

at com.thoughtworks.xstream.core.ReferenceByXPathMarshallingStrategy.unmarshal(ReferenceByXPathMarshallingStrategy.java:12)

at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:549)

at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:537)

at com.thoughtworks.xstream.XStream.fromXML(XStream.java:505)

at com.thoughtworks.xstream.XStream.fromXML(XStream.java:496)

at com.atlassian.confluence.extra.dynamictasklist.TaskListManager.getTaskList(TaskListManager.java:33)

at com.atlassian.confluence.extra.dynamictasklist.TaskListAction.getTaskList(TaskListAction.java:124)