http://bugzilla.slf4j.org/show_bug.cgi?id=184
Summary: Log array contents if only one parameter is specified in
log string
Product: SLF4J
Version: unspecified
Platform: PC
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P3
Component: Core API
AssignedTo: [email protected]
ReportedBy: [email protected]
Hello,
When using Java5 var-args which are represented as an array, slf4j logs only
the first item in the array (which is correct as per documentation, just that
it's not very intuitive).
Example:
void getFilteredData(String... filterValues) {
log.debug("Getting data, filtering using the following settings: {}",
filterValues);
return dao.doSomething();
}
What happens is that only the first item is logged, insted of all the items
being logged. The current work-around for this is to have the following method
call:
log.debug(".... {} {}", "", myArray); // note the first empty log parameter
I would suggest enhancing the framework to automatically log the array content
if only ONE {} parameter is specified in the log string. In this case:
log.debug("... {}", myArray); // logs full array content, not only first
item
log.debug("... {}={}"); // logs as per current algorithm - first two items
I believe it is safe to assume that people will use the log.debug(array) method
only when they have more than two parameters to show, thus - if only one
parameter is used, it's only reasonable that the FULL content of the passed
object is logged, no matter the type.
Thanks,
Dima
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