Change By: Sebastian Fischer (13/Feb/15 3:23 PM)
Description: When I run a maven multi module build there are frequent warnings in the console log.

[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ com.acme.prod.sto ---
[WARNING] Failed to notify spy hudson.maven.Maven3Builder$JenkinsEventSpy: org.apache.commons.io.IOUtils.lineIterator(Ljava/io/InputStream;Ljava/nio/charset/Charset;)Lorg/apache/commons/io/LineIterator;
[INFO] 
[INFO] --- build-helper-maven-plugin:1.9.1:add-source (add-source) @ com.acme.prod.sto ---
[INFO] Source directory: E:\Jenkins\workspace\
vCDM_Server_TRUNK prod \com.acme.prod.sto\sto added.
[WARNING] Failed to notify spy hudson.maven.Maven3Builder$JenkinsEventSpy: org.apache.commons.io.IOUtils.lineIterator(Ljava/io/InputStream;Ljava/nio/charset/Charset;)Lorg/apache/commons/io/LineIterator;
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ com.acme.prod.sto ---
[INFO] Using 'Cp1252' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory E:\Jenkins\workspace\
vCDM_Server_TRUNK prod \com.acme.prod.sto\src\main\resources
[INFO] skip non existing resourceDirectory E:\Jenkins\workspace\
vCDM_Server_TRUNK prod \com.acme.prod.sto\src\main\java
[WARNING] Failed to notify spy hudson.maven.Maven3Builder$JenkinsEventSpy: org.apache.commons.io.IOUtils.lineIterator(Ljava/io/InputStream;Ljava/nio/charset/Charset;)Lorg/apache/commons/io/LineIterator;
[INFO] 
[INFO] --- maven-compiler-plugin:3.2:compile (default-compile) @ com.acme.prod.sto ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 132 source files to E:\Jenkins\workspace\
vCDM_Server_TRUNK prod \com.acme.prod.sto\target\classes
[WARNING] Failed to notify spy hudson.maven.Maven3Builder$JenkinsEventSpy: org.apache.commons.io.IOUtils.lineIterator(Ljava/io/InputStream;Ljava/nio/charset/Charset;)Lorg/apache/commons/io/LineIterator;
[INFO] 
[INFO] --- maven-checkstyle-plugin:2.13:checkstyle (default) @ com.acme.prod.sto ---
[INFO] 
[WARNING] Failed to notify spy hudson.maven.Maven3Builder$JenkinsEventSpy: org.apache.commons.io.IOUtils.lineIterator(Ljava/io/InputStream;Ljava/nio/charset/Charset;)Lorg/apache/commons/io/LineIterator;
[INFO] 
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ com.acme.prod.sto ---
[INFO] Using 'Cp1252' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory E:\Jenkins\workspace\
vCDM_Server_TRUNK prod \com.acme.prod.sto\src\test\resources
[INFO] skip non existing resourceDirectory E:\Jenkins\workspace\
vCDM_Server_TRUNK prod \com.acme.prod.sto\src\test\java
[WARNING] Failed to notify spy hudson.maven.Maven3Builder$JenkinsEventSpy: org.apache.commons.io.IOUtils.lineIterator(Ljava/io/InputStream;Ljava/nio/charset/Charset;)Lorg/apache/commons/io/LineIterator;
[INFO] 
[INFO] --- maven-compiler-plugin:3.2:testCompile (default-testCompile) @ com.acme.prod.sto ---
[INFO] No sources to compile
[WARNING] Failed to notify spy hudson.maven.Maven3Builder$JenkinsEventSpy: org.apache.commons.io.IOUtils.lineIterator(Ljava/io/InputStream;Ljava/nio/charset/Charset;)Lorg/apache/commons/io/LineIterator;
[INFO] 
[INFO] --- maven-surefire-plugin:2.18.1:test (default-test) @ com.acme.prod.sto ---
[INFO] Tests are skipped.
[WARNING] Failed to notify spy hudson.maven.Maven3Builder$JenkinsEventSpy: org.apache.commons.io.IOUtils.lineIterator(Ljava/io/InputStream;Ljava/nio/charset/Charset;)Lorg/apache/commons/io/LineIterator;
[INFO] 
[INFO] --- maven-jar-plugin:2.5:jar (default-jar) @ com.acme.prod.sto ---
[INFO] Building jar: E:\Jenkins\workspace\
vCDM_Server_TRUNK prod \com.acme.prod.sto\target\com.acme.prod.sto-5.4.2-SNAPSHOT.jar
[WARNING] Failed to notify spy hudson.maven.Maven3Builder$JenkinsEventSpy: org.apache.commons.io.IOUtils.lineIterator(Ljava/io/InputStream;Ljava/nio/charset/Charset;)Lorg/apache/commons/io/LineIterator;
[INFO] 
[INFO] --- maven-install-plugin:2.4:install (default-install) @ com.acme.prod.sto ---
[INFO] Installing E:\Jenkins\workspace\
vCDM_Server_TRUNK prod \com.acme.prod.sto\target\com.acme.prod.sto-5.4.2-SNAPSHOT.jar to E:\MavenRepository\com\acme\collab\common\com.acme.prod.sto\5.4.2-SNAPSHOT\com.acme.prod.sto-5.4.2-SNAPSHOT.jar
[INFO] Installing E:\Jenkins\workspace\
vCDM_Server_TRUNK prod \com.acme.prod.sto\pom.xml to E:\MavenRepository\com\acme\collab\common\com.acme.prod.sto\5.4.2-SNAPSHOT\com.acme.prod.sto-5.4.2-SNAPSHOT.pom
[WARNING] Failed to notify spy hudson.maven.Maven3Builder$JenkinsEventSpy: org.apache.commons.io.IOUtils.lineIterator(Ljava/io/InputStream;Ljava/nio/charset/Charset;)Lorg/apache/commons/io/LineIterator;
[INFO] 
[INFO] --- maven-checkstyle-plugin:2.13:checkstyle (default-cli) @ com.acme.prod.sto ---
[INFO] 
[WARNING] Failed to notify spy hudson.maven.Maven3Builder$JenkinsEventSpy: org.apache.commons.io.IOUtils.lineIterator(Ljava/io/InputStream;Ljava/nio/charset/Charset;)Lorg/apache/commons/io/LineIterator;
[INFO] 
[INFO] --- javancss-maven-plugin:2.1:report (default-cli) @ com.acme.prod.sto ---
[INFO] Running JavaNCSS 33.54
[WARNING] Failed to notify spy hudson.maven.Maven3Builder$JenkinsEventSpy: org.apache.commons.io.IOUtils.lineIterator(Ljava/io/InputStream;Ljava/nio/charset/Charset;)Lorg/apache/commons/io/LineIterator;


I assume there are multiple versions of commons-io lib in the classpath.
The method signature org.apache.commons.io.IOUtils.lineIterator(Ljava/io/InputStream;Ljava/nio/charset/Charset;)Lorg/apache/commons/io/LineIterator; seems to be new in commons-io 2.4.

Edit:
I have disabled all post build setting -> the warnings disappeared.
If I re-enable the Checkstyle post build setting (Publish checkstyle analysis) the warning are displayed, but only under the checkstyle goal in the log.
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