Logback prints only String

Question

Connected via dependency SLF4j-api and Logback. Inside the class I write

private static final Logger log = LoggerFactory.getLogger(Printer.class);

then there is a method

 public static void collectionPrint(ArrayList list) { Iterator iterator = list.iterator(); while (iterator.hasNext()) { log.info("Printer ",iterator.next()); } }

It should display the collection, through System.out.println it displays everything correctly.
And in the logger writes

20: 57: 02.527 [main] INFO com.epam.as.coffeevan.service.BeverageFinder - Printer

How can this be fixed?

Nofate ♦ Nofate 32.6k 13 gold signs 57 silver marks 86 bronze marks · Accepted Answer · 2016-10-13T15:12:57

The first parameter of the logging methods in SLF4J is the string pattern . You must use the {} macro in places where you want to perform substitution. For example:

 logger.debug("Result={}, time={}", result, time);

Accordingly, in your case it will be:

 log.info("Printer {}", iterator.next());

Be sure to read the FAQ about parameterized logging .

Logback prints only String

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