Moving from Maven 3.2.5 or older to Maven 3.3.1 or newer breaks maven-antrun-plugin

[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building Cobertura Merge test 1.12-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ cobertura-report ---
[INFO] Deleting C:\IBXProjects\SUE\git\discovery\src\java\cobertura\target
[INFO] 
[INFO] --- maven-antrun-plugin:1.8:run (cobertura-merge-base) @ cobertura-report ---
[INFO] Executing tasks

main:
[cobertura-merge] Cobertura 2.1.1 - GNU GPL License (NO WARRANTY) - See COPYRIGHT file
[cobertura-merge] Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
[cobertura-merge] 	at net.sourceforge.cobertura.util.CommandLineBuilder.<clinit>(CommandLineBuilder.java:73)
[cobertura-merge] 	at net.sourceforge.cobertura.merge.MergeMain.merge(MergeMain.java:66)
[cobertura-merge] 	at net.sourceforge.cobertura.merge.MergeMain.main(MergeMain.java:77)
[cobertura-merge] Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
[cobertura-merge] 	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
[cobertura-merge] 	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
[cobertura-merge] 	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
[cobertura-merge] 	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
[cobertura-merge] 	... 3 more
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.265 s
[INFO] Finished at: 2016-05-31T18:59:31+03:00
[INFO] Final Memory: 9M/119M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-antrun-plugin:1.8:run (cobertura-merge-base) on project cobertura-report: An Ant BuildException has occured: Error running reports. See messages above.
[ERROR] around Ant part ...<cobertura-merge datafile="C:\.......\cobertura\target/cobertura/cobertura.ser">... @ 5:114 in C:\..........\cobertura\target\antrun\build-main.xml
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

<?xml version="1.0" encoding="UTF-8"?>
<project
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
	xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	<modelVersion>4.0.0</modelVersion>
	<properties>
		<cobertura.version>2.1.1</cobertura.version>
	</properties>

	<groupId>org.tests</groupId>
	<artifactId>cobertura-report</artifactId>
	<version>1.12-SNAPSHOT</version>
	<name>Cobertura Merge test</name>
	<packaging>pom</packaging>

	<build>
		<finalName>cobertura-report</finalName>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-antrun-plugin</artifactId>
				<version>1.8</version>
				<dependencies>
					<dependency>
						<groupId>org.slf4j</groupId>
						<artifactId>slf4j-api</artifactId>
						<version>1.7.5</version>
					</dependency>
					<dependency>
						<groupId>net.sourceforge.cobertura</groupId>
						<artifactId>cobertura</artifactId>
						<version>${cobertura.version}</version>
					</dependency>
				</dependencies>
				<executions>
					<!-- restart the wildfly servers at the beginning-->
					<execution>
						<id>cobertura-merge-base</id>
						<phase>package</phase>
						<goals>
							<goal>run</goal>
						</goals>
						<configuration>
							<target>
								<taskdef name="cobertura-merge" classname="net.sourceforge.cobertura.ant.MergeTask" classpathref="maven.plugin.classpath"/>
								<cobertura-merge datafile="${project.build.directory}/cobertura/cobertura.ser">
									<fileset dir="${project.basedir}/../">
										<include name="*.ser"/>
									</fileset>
								</cobertura-merge>
							</target>
						</configuration>
					</execution>
				</executions>
			</plugin>
		</plugins>
	</build>
</project>