diff --git a/src/main/scala/coursier/ShadingPlugin.scala b/src/main/scala/coursier/ShadingPlugin.scala
index 6000e3a..7e64a3f 100644
--- a/src/main/scala/coursier/ShadingPlugin.scala
+++ b/src/main/scala/coursier/ShadingPlugin.scala
@@ -4,8 +4,8 @@ import java.io.File
 import java.nio.charset.StandardCharsets
 import java.nio.file.Files
 import java.util.zip.ZipFile
-
 import com.eed3si9n.jarjar.Rule
+import com.eed3si9n.jarjar.misplaced.MisplacedClassProcessorFactory
 import com.eed3si9n.jarjar.util.CoursierJarProcessor
 import sbt._
 import sbt.Keys._
@@ -215,9 +215,8 @@ object ShadingPlugin extends AutoPlugin {
       val dest = orig.getParentFile / s"${orig.getName.stripSuffix(".jar")}-shading.jar"
       if (!dest.exists() || dest.lastModified() < orig.lastModified()) {
         import com.eed3si9n.jarjar.JJProcessor
-        import com.eed3si9n.jarjar.util.StandaloneJarProcessor
-        val processor = JJProcessor(rules, verbose, false)
-        CoursierJarProcessor.run((orig +: shadedJars0).toArray, dest, processor.proc, true)
+        val processor = new JJProcessor(rules, verbose, false, MisplacedClassProcessorFactory.Strategy.FATAL.toString)
+        CoursierJarProcessor.run((orig +: shadedJars0).toArray, dest, processor, true)
       }
       def isValid(entry: String): Boolean = 
         validEntries.contains(entry) || 
diff --git a/src/main/scala/org/pantsbuild/jarjar/JJProcessor.scala b/src/main/scala/org/pantsbuild/jarjar/JJProcessor.scala
deleted file mode 100644
index b856e19..0000000
--- a/src/main/scala/org/pantsbuild/jarjar/JJProcessor.scala
+++ /dev/null
@@ -1,33 +0,0 @@
-package com.eed3si9n.jarjar
-
-// from https://github.com/sbt/sbt-assembly/blob/17786404117889e5a8225c97b9b7639160fb91e8/src/main/scala/org/pantsbuild/jarjar/JJProcessor.scala
-
-import com.eed3si9n.jarjar.util.{EntryStruct, JarProcessor}
-
-import scala.collection.JavaConverters._
-
-class JJProcessor(val proc: JarProcessor) {
-
-  def process(entry: EntryStruct): Boolean = proc.process(entry)
-
-  def getExcludes(): Set[String] = {
-    val field = proc.getClass().getDeclaredField("kp")
-    field.setAccessible(true)
-    val keepProcessor = field.get(proc)
-
-    if (keepProcessor == null) Set()
-    else {
-      val method = proc.getClass().getDeclaredMethod("getExcludes")
-      method.setAccessible(true)
-      method.invoke(proc).asInstanceOf[java.util.Set[String]].asScala.toSet
-    }
-  }
-
-}
-
-object JJProcessor {
-
-  def apply(patterns: Seq[PatternElement], verbose: Boolean, skipManifest: Boolean): JJProcessor =
-    new JJProcessor(new MainProcessor(patterns.asJava, verbose, skipManifest))
-
-}