[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=15656743#comment-15656743
 ] 

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

Hi Gary,

unfortunately I cannot test against a Git master build today.

What I have done for now is to strip my test setting to log4j2 only (no more 
slf4j).

I generated a small test project using log4j2 version 2.7 and junit only:

*pom.xml*
{code:xml}
<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/xsd/maven-4.0.0.xsd";>
  <modelVersion>4.0.0</modelVersion>
  <groupId>my-current-tests</groupId>
  <artifactId>my-current-tests</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>sha-tests</name>
  <description>for testing only</description>
  <build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.3</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
    </plugins>
  </build>
  
  <dependencies>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.7</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.7</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.7</version>
                <type>test-jar</type>
                <scope>test</scope>
        </dependency>
        
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
                <scope>test</scope>
        </dependency>
        
  </dependencies>
  
</project>
{code}

*Test driver*

{code}
package de.stefan.test;


import java.util.Arrays;

import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.spi.ExtendedLogger;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.BlockJUnit4ClassRunner;

@RunWith(BlockJUnit4ClassRunner.class)
public class CheckLog4j2Test {

        /**
         * @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;
        }
        
        @Test
        public void testLog4j2Only() {
                org.apache.logging.log4j.Logger log4JLogger = 
LogManager.getLogger(this.getClass());
                Object[] args = createArray(33);

                
((ExtendedLogger)log4JLogger).logIfEnabled("org.apache.logging.slf4j.Log4jLogger",
 Level.ERROR, null, "test {}", args);
                System.out.println("args " + Arrays.toString(args));
                
                
((ExtendedLogger)log4JLogger).logIfEnabled("org.apache.logging.slf4j.Log4jLogger",
 Level.ERROR, null, "test {}", args);
                System.out.println("args " + Arrays.toString(args));
        }

}
{code}

Executing the test above yields to the following result, where {{args}} are 
still resetted:

{code}
ERROR StatusLogger No log4j2 configuration file found. Using default 
configuration: logging only errors to the console.
11:42:52.307 [main] ERROR de.stefan.test.CheckLog4j2Test - test 0
args [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 
21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32]
11:42:52.308 [main] ERROR de.stefan.test.CheckLog4j2Test - test null
args [null, null, null, null, null, null, null, null, null, null, null, null, 
null, null, null, null, null, null, null, null, null, null, null, null, null, 
null, null, null, null, null, null, null, null]
{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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