Log4j warning while using axis2-wsdl2code-maven-plugin to generate SOAP client - soap

Question

I am using axis2-wsdl2code-maven-plugin to generate my SOAP service client. The plugin itself works correctly and it generates a correct SOAP client, but I get following warning in console with every build:
log4j:WARN No appenders could be found for logger (org.apache.axiom.locator.DefaultOMMetaFactoryLocator).
log4j:WARN Please initialize the log4j system properly.
I know I need to configure Log4j properties, but I haven't found any functional way to do this in context of axis2-wsdl2code-maven-plugin...
This is my pom.xml file:
<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>
<artifactId>powerauth-java-client-axis</artifactId>
<version>0.13.0</version>
<name>powerauth-java-client-axis</name>
<description>PowerAuth 2.0 Service Client - Axis</description>
<parent>
<groupId>io.getlime.security</groupId>
<artifactId>powerauth-parent</artifactId>
<version>0.13.0</version>
<relativePath>../pom.xml</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.apache.axis2</groupId>
<artifactId>axis2</artifactId>
<version>1.6.3</version>
</dependency>
<dependency>
<groupId>org.apache.axis2</groupId>
<artifactId>axis2-adb</artifactId>
<version>1.6.3</version>
</dependency>
<dependency>
<groupId>org.apache.axis2</groupId>
<artifactId>axis2-transport-http</artifactId>
<version>1.6.3</version>
</dependency>
<dependency>
<groupId>org.apache.axis2</groupId>
<artifactId>axis2-transport-local</artifactId>
<version>1.6.3</version>
</dependency>
<dependency>
<groupId>org.apache.ws.commons.axiom</groupId>
<artifactId>axiom-api</artifactId>
<version>1.2.20</version>
</dependency>
<dependency>
<groupId>org.apache.ws.commons.axiom</groupId>
<artifactId>axiom-impl</artifactId>
<version>1.2.20</version>
</dependency>
<dependency>
<groupId>org.apache.ws.security</groupId>
<artifactId>wss4j</artifactId>
<version>1.6.19</version>
</dependency>
<dependency>
<groupId>wsdl4j</groupId>
<artifactId>wsdl4j</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<!-- tag::wsdl[] -->
<plugin>
<groupId>org.apache.axis2</groupId>
<artifactId>axis2-wsdl2code-maven-plugin</artifactId>
<version>1.6.4</version>
<executions>
<execution>
<goals>
<goal>wsdl2code</goal>
</goals>
<configuration>
<packageName>io.getlime.powerauth.soap</packageName>
<wsdlFile>${basedir}/src/main/resources/soap/wsdl/service.wsdl</wsdlFile>
</configuration>
</execution>
</executions>
</plugin>
<!-- end::wsdl[] -->
</plugins>
</build>
</project>

Answer 1

This is actually a bug. The fix for AXIS2-5364 added a dependency on log4j to axis2-wsdl2code-maven-plugin. The problem is that some of the code executed by the plugin uses Commons Logging and therefore started to use log4j. That generates the warning you have seen because in a Maven environment, log4j isn't configured.
What the plugin should do is to redirect logs to SLF4J, because that API is supported by recent Maven versions. The -X option (which enables debug logging on the Maven command line) then works for these logs as well.
This problem will be addressed in AXIS2-5827.