diff --git a/backend/src/main/scala/bloop/BloopClassFileManager.scala b/backend/src/main/scala/bloop/BloopClassFileManager.scala
index e3f8a299a6..3b1d00264e 100644
--- a/backend/src/main/scala/bloop/BloopClassFileManager.scala
+++ b/backend/src/main/scala/bloop/BloopClassFileManager.scala
@@ -154,13 +154,15 @@ final class BloopClassFileManager(
     val toBeBackedUp = (classes ++ invalidatedExtraCompileProducts).filter(c =>
       !movedFiles.contains(c) && !generatedFiles(c)
     )
-    for (c <- toBeBackedUp)
-      if (c.exists)
-        movedFiles.put(c, move(c)).foreach(move)
+    for {
+      c <- toBeBackedUp
+      if c.exists()
+    } movedFiles.put(c, move(c)).foreach(move)
 
-    classes.foreach { f =>
-      if (f.exists()) f.delete()
-    }
+    for {
+      f <- classes
+      if f.exists()
+    } f.delete()
 
     allInvalidatedExtraCompileProducts.++=(invalidatedExtraCompileProducts)
   }
@@ -227,13 +229,12 @@ final class BloopClassFileManager(
        */
       for {
         (orig, tmp) <- movedFiles
+        if tmp.exists
       } {
-        if (tmp.exists) {
-          if (!orig.getParentFile.exists) {
-            Files.createDirectory(orig.getParentFile.toPath())
-          }
-          Files.move(tmp.toPath(), orig.toPath())
+        if (!orig.getParentFile.exists) {
+          Files.createDirectory(orig.getParentFile.toPath())
         }
+        Files.move(tmp.toPath(), orig.toPath())
       }
       backupDir.toFile().delete()
       ()
diff --git a/backend/src/main/scala/bloop/BloopClasspathEntryLookup.scala b/backend/src/main/scala/bloop/BloopClasspathEntryLookup.scala
index a99167c828..b2197c16f2 100644
--- a/backend/src/main/scala/bloop/BloopClasspathEntryLookup.scala
+++ b/backend/src/main/scala/bloop/BloopClasspathEntryLookup.scala
@@ -33,14 +33,15 @@ final class BloopClasspathEntryLookup(
   }
 
   override def definesClass(entry: VirtualFile): DefinesClass = {
-    val file = converter.toPath(entry).toFile()
+    val path = converter.toPath(entry)
+    val file = path.toFile()
     if (!file.exists) FalseDefinesClass
     else {
       classpathHashes.find(fh => fh.file() == file) match {
         case None => FalseDefinesClass
         case Some(entryHash) =>
           def computeDefinesClassForJar = {
-            if (!ClasspathUtil.isArchive(file.toPath(), contentFallback = true)) FalseDefinesClass
+            if (!ClasspathUtil.isArchive(path, contentFallback = true)) FalseDefinesClass
             else new JarDefinesClass(file)
           }
 
diff --git a/backend/src/main/scala/bloop/Compiler.scala b/backend/src/main/scala/bloop/Compiler.scala
index dbbbbc4046..af2e504aeb 100644
--- a/backend/src/main/scala/bloop/Compiler.scala
+++ b/backend/src/main/scala/bloop/Compiler.scala
@@ -287,7 +287,6 @@ object Compiler {
     def getCompilationOptions(inputs: CompileInputs): CompileOptions = {
       // Sources are all files
       val sources = inputs.sources.map(path => converter.toVirtualFile(path.underlying))
-
       val classpath = inputs.classpath.map(path => converter.toVirtualFile(path.underlying))
       val optionsWithoutFatalWarnings = inputs.scalacOptions.flatMap { option =>
         if (option != "-Xfatal-warnings") List(option)
diff --git a/backend/src/main/scala/bloop/CompilerCache.scala b/backend/src/main/scala/bloop/CompilerCache.scala
index 3949f9de8a..4a44f8d638 100644
--- a/backend/src/main/scala/bloop/CompilerCache.scala
+++ b/backend/src/main/scala/bloop/CompilerCache.scala
@@ -206,7 +206,7 @@ final class CompilerCache(
               BloopForkedJavaUtils.launch(
                 javaHome,
                 "javac",
-                sources.map(converter.toPath(_).toFile()),
+                sources.map(converter.toPath(_)),
                 options,
                 log,
                 reporter
@@ -332,7 +332,9 @@ final class CompilerCache(
           zincManager match {
             case m: bloop.BloopClassFileManager => m.invalidatedClassFilesSet
             // Bloop uses it's own classfile manager so this should not happen
-            case _ => new HashSet[File]()
+            case _ => 
+              logger.warn("Could not find BloopClassfileManager that is needed for invaldiation.")
+              new HashSet[File]()
 
           }
         }
diff --git a/backend/src/main/scala/sbt/internal/inc/BloopComponentCompiler.scala b/backend/src/main/scala/sbt/internal/inc/BloopComponentCompiler.scala
index 87b1399eb2..7fd2438a55 100644
--- a/backend/src/main/scala/sbt/internal/inc/BloopComponentCompiler.scala
+++ b/backend/src/main/scala/sbt/internal/inc/BloopComponentCompiler.scala
@@ -63,10 +63,8 @@ object BloopComponentCompiler {
     }
 
     val (isDotty, organization, version) = scalaInstance match {
-      case instance: BloopScalaInstance =>
-        if (instance.isDotty) (true, instance.organization, instance.version)
-        else (false, "org.scala-sbt", latestVersion)
-      case instance: ScalaInstance => (false, "org.scala-sbt", latestVersion)
+      case instance: BloopScalaInstance if instance.isDotty => (true, instance.organization, instance.version)
+      case _ => (false, "org.scala-sbt", latestVersion)
     }
 
     val bridgeId = compilerBridgeId(scalaInstance.version)
@@ -375,13 +373,13 @@ private[inc] class BloopComponentCompiler(
 
           logger.debug(s"Sources from bloop bridge: $regularSourceContents")
 
-          val mergedJar = Files.createTempFile(HydraSupport.bridgeNamePrefix, "merged").toFile
+          val mergedJar = Files.createTempFile(HydraSupport.bridgeNamePrefix, "merged")
           logger.debug(s"Merged jar destination: $mergedJar")
           val allSourceContents =
             (hydraSourceContents ++ regularSourceContents).map(s => s -> relativize(tempDir, s).get)
 
-          zip(allSourceContents.toSeq, mergedJar, time = None)
-          Right(Vector(mergedJar.toPath()))
+          zip(allSourceContents.toSeq, mergedJar.toFile(), time = None)
+          Right(Vector(mergedJar))
         }
 
       case Right(Seq()) =>
diff --git a/backend/src/main/scala/sbt/internal/inc/javac/BloopForkedJavaUtils.scala b/backend/src/main/scala/sbt/internal/inc/javac/BloopForkedJavaUtils.scala
index 178ed3225f..f86d78ef6c 100644
--- a/backend/src/main/scala/sbt/internal/inc/javac/BloopForkedJavaUtils.scala
+++ b/backend/src/main/scala/sbt/internal/inc/javac/BloopForkedJavaUtils.scala
@@ -3,12 +3,13 @@ package sbt.internal.inc.javac
 import java.io.File
 import xsbti.Logger
 import xsbti.Reporter
+import java.nio.file.Path
 
 object BloopForkedJavaUtils {
   def launch(
       javac: Option[File],
       binaryName: String,
-      sources: Seq[File],
+      sources: Seq[Path],
       options: Seq[String],
       log: Logger,
       reporter: Reporter
@@ -16,7 +17,7 @@ object BloopForkedJavaUtils {
     def normalizeSlash(s: String) = s.replace(File.separatorChar, '/')
 
     val (jArgs, nonJArgs) = options.partition(_.startsWith("-J"))
-    val allArguments = nonJArgs ++ sources.map(_.getAbsolutePath)
+    val allArguments = nonJArgs ++ sources.map(_.toAbsolutePath().toString())
 
     val exe = javac match {
       case None => binaryName