Here is another interesting thing.
If I remove the log4j-1.2-api dependency from the pom, then the when I try
to build the project from Terminal, I get the following failure:
[*ERROR*]
*/Users/desilets/Documents/GitRepositories/SpikeLog4j2Compatibility/src/main/java/org/examples/HelloWorld.java:[3,24]
package org.apache.log4j does not exist*
Which is what I would expect.
But the project builds and runs without problem in intelliJ. This is true
even if I do "Invalidate caches and Restart".
Very strange.
On Wed, Jul 6, 2022 at 7:27 AM Alain Désilets <alaindesile...@gmail.com>
wrote:
> I am trying to use log4j2 through log4j-1.2-api in the context of an
> uber-jar created with the maven shade plugin and am experiencing issues.
>
> I wrote a simple HelloWorld class that illustrates the issue.
>
> When I run this class through intelliJ, everything works fine. But when I
> run it through a terminal, I get
>
> ERROR StatusLogger Reconfiguration failed: No configuration found for
> '55f96302' at 'null' in 'null'
>
>
> In both cases, I invoke the command with
>
> -Dlog4j.configuration=/path/to/my/log4j.properties
>
>
> And the log4j.properties is in the old log4j style (i.e. NOT log4j2 style).
>
> Not sure what I am doing wrong.
>
> One thing I notice is that the class path is different in both situations.
> When running through intelliJ, it contains a great number of jars,
> including:
>
>
> -
>
> .m2/repository/org/apache/logging/log4j/log4j-core/2.17.2/log4j-core-2.17.2.jar
> -
>
> .m2/repository/org/apache/logging/log4j/log4j-api/2.17.2/log4j-api-2.17.2.jar
> -
>
> .m2/repository/org/apache/logging/log4j/log4j-1.2-api/2.17.2/log4j-1.2-api-2.17.2.jar
>
> whereas when I run it from terminal, it just contains my one uber-jar. But
> based on the content of my pom, I expect that the uber jar will contain
> classes from those same log4j jars.
>
> Here are the details of this HelloWorld example.
>
>
> This is the HelloWorld class
>
> package org.examples;
>
> import org.apache.log4j.Logger;
>
> import java.net.URL;
> import java.net.URLClassLoader;
>
> public class HelloWorld {
>
> public static void main(String[] args) {
> printClassPath();
> Logger logger = Logger.getLogger("org.examples.HelloWorld");
> logger.trace("Hello from Logger");
> }
>
> private static void printClassPath() {
> ClassLoader cl = ClassLoader.getSystemClassLoader();
> URL[] urls = ((URLClassLoader)cl).getURLs();
>
> System.out.println("Class path is:");
> for(URL url: urls){
> System.out.println(url.getFile());
> }
> }
> }
>
>
> And here is the pom:
>
> <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>org.examples</groupId>
> <artifactId>log4j2-compatibility</artifactId>
> <version>1.0.0</version>
>
> <properties>
> <log4j.version>2.17.2</log4j.version>
> </properties>
>
> <build>
> <plugins>
> <!-- Use shade plugin to create an uber-jar with all dependencies -->
> <plugin>
> <groupId>org.apache.maven.plugins</groupId>
> <artifactId>maven-shade-plugin</artifactId>
> <version>3.1.0</version>
> <configuration>
> <shadedArtifactAttached>true</shadedArtifactAttached>
> <shadedClassifierName>jar-with-dependencies</shadedClassifierName>
> <filters>
> <filter>
> <artifact>*:*</artifact>
> <excludes>
> <!-- This file may contain some log4j configuration that
> is not in sync with the actual version of log4j we
> use. So we exclude all versions of that file that
> might be inherited from a dependency-->
> <exclude>**/Log4j2Plugins.dat</exclude>
> </excludes>
> </filter>
> </filters>
> </configuration>
> <executions>
> <execution>
> <phase>package</phase>
> <goals>
> <goal>shade</goal>
> </goals>
> </execution>
> </executions>
> </plugin>
> </plugins>
> </build>
>
> <dependencies>
>
> <dependency>
> <groupId>org.apache.logging.log4j</groupId>
> <artifactId>log4j-core</artifactId>
> <version>${log4j.version}</version>
> </dependency>
>
> <dependency>
> <groupId>org.apache.logging.log4j</groupId>
> <artifactId>log4j-1.2-api</artifactId>
> <version>${log4j.version}</version>
> </dependency>
>
> </dependencies>
> </project>
>
>
> And here is the log4.properties file
>
> # Log to stdout only
> log4j.rootLogger=warn, stdout
>
> # Configure the stdout logger
> log4j.appender.stdout=org.apache.log4j.ConsoleAppender
> log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
> log4j.appender.stdout.layout.ConversionPattern =-- %c{2}: %m%n
>
> # Activate some traces
> log4j.logger.org.examples.HelloWorld=trace
>
>
