[MASSEMBLY-858] use plugin classloader instead of thread classloader fixes issues caused by MNG-6209 fix: but currently, every m-assembly-p from 2.2 to 3.0.0 using descriptor from classloader will fail with Maven 3.5.1...
maven/plugins/trunk/maven-assembly-plugin/src/main/java/org/apache/maven/plugins/assembly/io/DefaultAssemblyReader.java