Hi,
I cannot make the log4j2 log4j-jul bridge work, so that that the logs of a
library using JUL logging end up in the Log4j2 output.
My setup:
- java openjdk 11.0.24 2024-07-16 LTS
- Groovy Version: 4.0.22 JVM: 11.0.24 Vendor: Amazon.com Inc. OS: Linux
Maven pom snippet:
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-bom</artifactId>
<version>2.24.1</version>
<scope>import</scope>
<type>pom</type>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.apache.groovy</groupId>
<artifactId>groovy-all</artifactId>
<version>4.0.22</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-iostreams</artifactId>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-jul</artifactId>
</dependency>
</dependencies>
Linux command line for execution:
groovy -cp "../../../target/dependency/*"
-Dlog4j2.configurationFile=../resources/log4j2.xml
-Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager
myscript.groovy
Content of myscript.groovy:
import groovy.transform.Field
import org.apache.logging.log4j.LogManager
import org.apache.logging.log4j.Logger
@Field
static final Logger logger = LogManager.getLogger()
logger.info System.getProperty("java.util.logging.manager")
logger.info "java.util.logging.LogManager.logManager=" +
java.util.logging.LogManager.manager?.getClass()
java.util.logging.Logger.getLogger("jullogger").warning("test jul log")
Script output:
[INFO] org.apache.logging.log4j.jul.LogManager
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.codehaus.groovy.vmplugin.v9.Java9
(file:/mnt/c/pappl/sources/paysafe/ecash-platform/ecash-pipeline-groovy/src/main/groovy/../../../target/dependency/groovy-4.0.22.jar)
to field java.util.logging.LogManager.manager
WARNING: Please consider reporting this to the maintainers of
org.codehaus.groovy.vmplugin.v9.Java9
WARNING: Use --illegal-access=warn to enable warnings of further illegal
reflective access operations
WARNING: All illegal access operations will be denied in a future release
[INFO] java.util.logging.LogManager.logManager=class
java.util.logging.LogManager
Oct 29, 2024 4:11:59 PM org.codehaus.groovy.vmplugin.v8.IndyInterface fromCache
WARNING: test jul log
As you can see java.util.logging.LogManager.logManager is an instance of
java.util.logging.LogManager, but it should be
org.apache.logging.log4j.jul.LogManager as configured on the Groovy command
line via the system property.
You can also see that the “test jul log” output does use the standard JUL
format, as it is not forwarded to the Log4J2 system.
It looks like the code which initializes static final
java.util.logging.LogManager.manager field in a static code block, retrieves
System.getProperty("java.util.logging.manager") as null, and therefore
fallbacks to the default JUL LogManager.
Is this related to the dynamic compilation approach I use here?
I also tried to set the java.util.logging.manager system property through a
compiler configscript on the command line, but it had no positive effect.
I also tried to use -Dlog4j2.debug=true to gather more helpful information, but
there was nothing helpful.
As mentioned above, it must be somehow related to the static initialization and
the system property.
The basically same setup works fine when run through a Groovy run config in
IntelliJ.
Thanks a lot,
Maik
