Chris asked me to file this. On line 178 of cas/workflow/structs/TaskJobInput.java, you the following:
for (String key: fileProps.stringPropertyNames())
stringPropertyNames() is not a part of the java specs of java.util.Properties until 1.6. If compatibility with 1.5 is desirable, we'll probably need to use propertyNames(), but there may be issues with doing that (as 1.6 propertyNames throws an exception but 1.5 does not, which makes me wonder if they're not doing the same thing...?).
Talk amongst yourselves.