WARN log level to high for message about overriding type handlers

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Create a GSON object: new GsonBuilder().create(); 
2. Retrotranslate the byte code to jdk 1.4, using Retrotranslator 
http://retrotranslator.sourceforge.net/
3. Run the code.

What is the expected output? What do you see instead?

I would expect no WARNINGs to be logged. However, I see the following output to 
the console:

com.google.gson.ParameterizedTypeHandlerMap register
WARNING: Overriding the existing type handler for interface java.util.Collection

What version of the product are you using? On what operating system?
1.3 and also tested with 1.4 built from trunk.

Please provide any additional information below.

This log message comes from the following line of code:
http://code.google.com/p/google-
gson/source/browse/trunk/gson/src/main/java/com/google/gson/ParameterizedTypeHan
dlerM
ap.java#49


Specifically, it is logged because the 
DefaultTypeAdapters.createDefaultInstanceCreators method 
adds a COLLECTION_TYPE_HANDLER for Collection.class, and then later, a 
Queue.class. 
Because Queue.class is @since 1.5, retrotranslator replaces the class literal 
"java.util.Queue", with 
"java.util.Collection". This causes the Queue type handler to overwrite the 
Collection type 
handler.

    map.register(Map.class, MAP_TYPE_ADAPTER);

    // Add Collection type instance creators
    map.register(Collection.class, COLLECTION_TYPE_ADAPTER);
    map.register(List.class, COLLECTION_TYPE_ADAPTER);
    map.register(Queue.class, COLLECTION_TYPE_ADAPTER);


I'm not sure that a WARNING is needed here, since both Collection and Queue 
have the same 
Collection type handlers. 

Either the WARNING could be removed, or there could be some smarter registering 
of type 
handlers so that the Queue class automatically gets the COLLECTION_TYPE_HANDLER.

Original issue reported on code.google.com by npel...@gmail.com on 27 Aug 2009 at 1:17

[noamsinger]

By code:

private static void logfixInit() {
    {
        // com.google.gson.level = OFF
        try {
            String newLoggingProperties // this is a copy of the original one +
                    = "handlers= java.util.logging.ConsoleHandler\n"
                    + ".level= INFO\n"
                    + "rectory.\n"
                    + "java.util.logging.FileHandler.pattern = %h/java%u.log\n"
                    + "java.util.logging.FileHandler.limit = 50000\n"
                    + "java.util.logging.FileHandler.count = 1\n"
                    + "java.util.logging.FileHandler.formatter = java.util.logging.XMLFormatter\n"
                    + "java.util.logging.ConsoleHandler.level = INFO\n"
                    + "java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter\n"
                    + "com.google.gson.level = OFF\n" // changed to disable gson as per https://github.com/google/gson/issues/151
                    // + "com.xyz.foo.level = SEVERE\n"
                    ;
            LogManager logManager = LogManager.getLogManager();
            logManager.readConfiguration(new ByteArrayInputStream(newLoggingProperties.getBytes()));
        } catch (Exception e) {
            // log error
        }
    }
}