[jira] [Created] (FELIX-5400) Can't override default configuration type list value using an empty list

[Pierre De Rop (JIRA)]

Pierre De Rop created FELIX-5400:
------------------------------------

             Summary: Can't override default configuration type list value 
using an empty list
                 Key: FELIX-5400
                 URL: https://issues.apache.org/jira/browse/FELIX-5400
             Project: Felix
          Issue Type: Bug
          Components: Dependency Manager
    Affects Versions: org.apache.felix.dependencymanager-r8
            Reporter: Pierre De Rop
            Assignee: Pierre De Rop
            Priority: Minor
             Fix For: org.apache.felix.dependencymanager-r9


Assume you are using the following configuration type:

{code}
    public interface MyConfig {
        public default List<String> getList() { 
                return Arrays.asList("a", "b");
        }        
    }
{code}

So, you can then declare the following values in the actual configuration 
dictionary for the "list" key:

{code}
list=[a,b]

or

list.0=a
list.1=b
{code}

But assuming that you now want to register in config admin a configuration 
dictionary with an empty list (you really want an empty list []): then it is 
not currently possible, because if you don't declare any values for the "list" 
key, then the default value of the configuration type will be returned (see 
FELIX5399).

And if you declare the following value for the "list" key:

list=[]

then it does not work too  (an empty list won't be returned) because the 
"toCollection" method in the Configurable.java class calls: 

{code}
Arrays.asList(str.split("\\s*,\\s*"))
{code}

which then returns an array of size=1, instead of returning an array of zero 
size.




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