[jira] [Commented] (LOG4J2-1688) Multiple loggings of arguments are setting these arguments to null

[Stefan Hammelbeck (JIRA)]

    [ 
https://issues.apache.org/jira/browse/LOG4J2-1688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15654263#comment-15654263
 ] 

Stefan Hammelbeck commented on LOG4J2-1688:
-------------------------------------------

*Example code:*

{code}
package de.deutschepost.rs.zd.tv.model;

import java.util.Arrays;

import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.BlockJUnit4ClassRunner;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Bug description:
 * 
 * We are using SLF4J over Log4j Version 2.7.
 * 
 * Calling <code>org.slf4j.Logger.error(someFormat, args)</code> <b>twice</b> 
with an <code>Object[] args</code> causes all elements
 * of <code>args</code> to be set to <code>null</code>.
 * 
 */
@RunWith(BlockJUnit4ClassRunner.class)
public class CheckLog4j2Test {

        @Test
        public void testLog4j2() {

                // Argument-array creation
                int limit = 33;
                Object[] args = createArray(limit);
                Object[] originalArgs = Arrays.copyOf(args, args.length);

                System.out.println("args " + Arrays.toString(args));

                // Logger definition
                String someFormat = "test {}";
                Logger logger = LoggerFactory.getLogger(this.getClass());

                // First logging of args
                logger.error(someFormat, args); // Only the first element 
(args[0]) of args will be logged - why?
                Assert.assertArrayEquals(originalArgs, args);
                System.out.println("args are still ok: " + 
Arrays.toString(args));

                // Bug: The second logging of args sets all elements of args to 
null
                logger.error(someFormat, args);
                System.out.println("args " + Arrays.toString(args));
                Assert.assertArrayEquals(originalArgs, args);
        }

        /**
         * @param size
         * @return
         */
        private static Object[] createArray(int size) {
                Object[] args = new Object[size];
                for (int i = 0; i < args.length; i++) {
                        args[i] = i;
                }
                return args;
        }
}
{code}

> Multiple loggings of arguments are setting these arguments to null
> ------------------------------------------------------------------
>
>                 Key: LOG4J2-1688
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1688
>             Project: Log4j 2
>          Issue Type: Bug
>    Affects Versions: 2.7
>            Reporter: Stefan Hammelbeck
>
> We are using SLF4J over log4j Version 2.7.
> Calling {{org.slf4j.Logger.error(someFormat, args)}} *twice* with an 
> {{Object[] args}}  causes all elements of {{args}} to be set to {{null}}.



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