Karol B. created LOG4J2-2242:
--------------------------------
Summary: Log4j2 - logger overrides another logger's message
Key: LOG4J2-2242
URL: https://issues.apache.org/jira/browse/LOG4J2-2242
Project: Log4j 2
Issue Type: Bug
Affects Versions: 2.10.0
Reporter: Karol B.
We are trying to migrate our application from slf4j with log4j to log4j2
(2.10.0). We noticed a problem:
1) We call
LOGGER.warn("Message: object value is {}", object)
from class A
2) Object overrides toString method invoking static method from other class B
3) Method that generates String representation of object use logger :
LOGGER.warn( "Used ObjectsToStringGenerator for class: {}", o.getClass() )
We expect logs to looks like:
{code:java}
2018-02-05 06:07:25.233 [main] WARN MainClass - Message: object values is
[object string]
2018-02-05 06:07:25.233 [main] WARN ExampleObject - Used
ObjectsToStringGenerator for class: class ExampleObject{code}
But we get this:
{code:java}
2018-02-05 15:01:43.359 [main] WARN MainClass - Used ObjectsToStringGenerator
for class: class ExampleObject[object string]
2018-02-05 15:01:43.373 [main] WARN ObjectsToStringGenerator -
ObjectsToStringGenerator for class: ExampleObject{code}
If we explicity invoke toString method:
LOGGER.warn("Message: object value is {}", object.toString() )
everything is working as expected, but of course, we would like to avoid
explicite use of object.toString(). We tried also using sync loggers/appendrs
but we got error:
main ERROR Recursive call to appender CONSOLE.
Below example code/logger configuration:
MainClass.java:
{code:java}
public class MainClass
{
private static final Logger LOGGER = LogManager.getLogger( MainClass.class
);
public static void main(String[] args) throws InterruptedException {
//...
LOGGER.warn( "Message: object value is {}", new ExampleObject() );
//...
}
}
{code}
ExampleObject.java:
{code:java}
public class ExampleObject
{
@Override
public String toString()
{
return ObjectsToStringGenerator.getStringValue( this );
}
}
{code}
ObjectsToStringGenerator.java:
{code:java}
public class ObjectsToStringGenerator
{
private static final Logger LOGGER = LogManager.getLogger(
ObjectsToStringGenerator.class );
public static String getStringValue(Object o){
LOGGER.warn( "Used ObjectsToStringGenerator for class: {}", o.getClass() );
return "[object string]";
}
}
{code}
The configuration file (we tested this also in RollingFile appender and our
custom implementation with the same result):
{code:java}
<?xml version="1.0" encoding="UTF-8"?>
<Configuration>
<Appenders>
<Console name="CONSOLE" target="SYSTEM_OUT">
<PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS}[%t] %p %c{2}- %m%n" />
</Console>
</Appenders>
<Loggers>
<Root level="debug">
<AppenderRef ref="CONSOLE" />
</Root>
</Loggers>
</Configuration>
{code}
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