I am getting this error when running the jetty-maven-plugin:
[INFO] --- jetty-maven-plugin:7.6.1.v20120215:start (start-jetty) @ rest ---
log4j:WARN No appenders could be found for logger (org.eclipse.jetty.util.log).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
The project is a war which contains log4j.properties in WEB-INF/classes
.
I am also passing in the following properties to the plugin, just for the sake of seeing what's going on (that particular log4j.properties file exists in the location below as well):
<!-- Log4J settings -->
<systemProperty>
<name>log4j.configuration</name>
<value>file://${project.build.testOutputDirectory}/log4j.properties</value>
</systemProperty>
<systemProperty>
<name>log4j.debug</name>
</systemProperty>
The logging in the webapp works fine. However, I am baffled by the error.
I have these dependencies in the project:
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-core</artifactId>
</dependency>
In addition, when the tests (which need Jetty) start running, I do see the following output:
log4j: Using URL [file:/project/foo/rest/target/test-classes/log4j.properties] for automatic log4j configuration.
log4j: Reading configuration from URL file:/project/foo/rest/target/test-classes/log4j.properties
log4j: Parsing for [root] with value=[ERROR, console].
log4j: Level token is [ERROR].
log4j: Category root set to ERROR
log4j: Parsing appender named "console".
log4j: Parsing layout options for "console".
log4j: Setting property [conversionPattern] to [%d %p %c - %m%n].
log4j: End of parsing for "console".
log4j: Parsed "console" options.
log4j: Parsing for [project.foo] with value=[DEBUG].
log4j: Level token is [DEBUG].
log4j: Category project.foo set to DEBUG
log4j: Handling log4j.additivity.project.foo=[null]
log4j: Finished configuring.
Could somebody tell me why Jetty is unhappy?
Another alternative is to use "file:///" style url for log4j.properties as follows :
<plugin>
<groupId>org.mortbay.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>8.1.10.v20130312</version>
<configuration>
<systemProperties>
<systemProperty>
<name>log4j.configuration</name>
<!-- have to use file:/// url since -->
<!-- Jetty is using classloader -->
<!-- before the webapp classloader is ready -->
<value>file:///${basedir}/src/main/resources/log4j.properties</value>
</systemProperty>
<configuration>
<dependencies>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.6.6</version>
</dependency>
</dependencies>
</plugin>
I had the same problem where Jetty was looking for the log4j.properties file using a classloader that didn't include my project's source code. SO it kept complaining "log4j:WARN No appenders could be found for logger (org.eclipse.jetty.util.log).". But this workaround solved it and I'm able to see the log message and control them through log4j.