Is it a good practice to use intern() in all ids ?

[smallufo]

I am using a profiler to analyze an OOM heap-dump file , and find tons of
duplicated Strings .
These strings are mostly IDs of wicket components or PropertyModel's
expression ...
I wonder if it a good practice to "intern()" all these Strings ?

such as :

private final static String TIME_STR = "time".intern();
add(new Label(TIME_STR , foobar));