diff --git a/src/main/scala/com/typesafe/sbteclipse/core/Eclipse.scala b/src/main/scala/com/typesafe/sbteclipse/core/Eclipse.scala
index 71355ee..11e8be8 100644
--- a/src/main/scala/com/typesafe/sbteclipse/core/Eclipse.scala
+++ b/src/main/scala/com/typesafe/sbteclipse/core/Eclipse.scala
@@ -25,6 +25,7 @@ import EclipsePlugin.{
   EclipseCreateSrc,
   EclipseProjectFlavor,
   EclipseExecutionEnvironment,
+  EclipseJDTMode,
   EclipseKeys
 }
 import java.io.{ FileWriter, Writer }
@@ -64,6 +65,8 @@ import scalaz.{ Equal, NonEmptyList }
 import scalaz.Scalaz._
 import scalaz.effect.IO
 import com.typesafe.sbteclipse.core.util.ScalaVersion
+import java.io.FileReader
+import java.io.Reader
 
 private object Eclipse extends EclipseSDTConfig {
   val SettingFormat = """-([^:]*):?(.*)""".r
@@ -82,12 +85,16 @@ private object Eclipse extends EclipseSDTConfig {
 
   val JavaNature = "org.eclipse.jdt.core.javanature"
 
+  val JreContainerVersionSelector = """.*/.*/.*-([0-9.]+)""".r
+
   def eclipseCommand(commandName: String): Command =
     Command(commandName)(_ => parser)((state, args) => action(args.toMap, state))
 
   def parser: Parser[Seq[(String, Any)]] = {
     import EclipseOpts._
-    (executionEnvironmentOpt | boolOpt(SkipParents) | boolOpt(WithSource) | boolOpt(WithJavadoc) | boolOpt(WithBundledScalaContainers)).*
+    (executionEnvironmentOpt | jdtModeOpt |
+      boolOpt(SkipParents) | boolOpt(WithSource) | boolOpt(WithJavadoc) |
+      boolOpt(WithBundledScalaContainers)).*
   }
 
   def executionEnvironmentOpt: Parser[(String, EclipseExecutionEnvironment.Value)] = {
@@ -99,11 +106,21 @@ private object Eclipse extends EclipseSDTConfig {
     (Space ~> ExecutionEnvironment ~ ("=" ~> executionEnvironments)) map { case (k, v) => k -> withName(v) }
   }
 
+  def jdtModeOpt: Parser[(String, EclipseJDTMode.Value)] = {
+    import EclipseJDTMode._
+    import EclipseOpts._
+    import sbt.complete.DefaultParsers._
+    val (head :: tail) = valueSeq map (_.toString)
+    val jdtModes = tail.foldLeft(head: Parser[String])(_ | _)
+    (Space ~> JDTMode ~ ("=" ~> jdtModes)) map { case (k, v) => k -> withName(v) }
+  }
+
   def action(args: Map[String, Any], state: State): State = {
     state.log.info("About to create Eclipse project files for your project(s).")
     import EclipseOpts._
     handleProjects(
       (args get ExecutionEnvironment).asInstanceOf[Option[EclipseExecutionEnvironment.Value]],
+      (args get JDTMode).asInstanceOf[Option[EclipseJDTMode.Value]],
       (args get SkipParents).asInstanceOf[Option[Boolean]] getOrElse skipParents(ThisBuild, state),
       (args get WithSource).asInstanceOf[Option[Boolean]],
       (args get WithJavadoc).asInstanceOf[Option[Boolean]],
@@ -112,6 +129,7 @@ private object Eclipse extends EclipseSDTConfig {
 
   def handleProjects(
     executionEnvironmentArg: Option[EclipseExecutionEnvironment.Value],
+    jdtModeArg: Option[EclipseJDTMode.Value],
     skipParents: Boolean,
     withSourceArg: Option[Boolean],
     withJavadocArg: Option[Boolean],
@@ -138,6 +156,7 @@ private object Eclipse extends EclipseSDTConfig {
       applic(
         handleProject(
           jreContainer(executionEnvironmentArg orElse executionEnvironment(ref, state)),
+          jdtModeArg getOrElse jdtMode(ref, state),
           relativizeLibs(ref, state),
           builderAndNatures(projectFlavor(ref, state)),
           state))
@@ -184,6 +203,7 @@ private object Eclipse extends EclipseSDTConfig {
 
   def handleProject(
     jreContainer: String,
+    jdtMode: EclipseJDTMode.Value,
     relativizeLibs: Boolean,
     builderAndNatures: (String, Seq[String]),
     state: State)(
@@ -217,6 +237,7 @@ private object Eclipse extends EclipseSDTConfig {
       _ <- saveXml(baseDirectory / ".classpath", new RuleTransformer(classpathTransformers: _*)(cp))
       _ <- saveProperties(baseDirectory / ".settings" / "org.eclipse.core.resources.prefs", Seq(("encoding/<project>" -> "UTF-8")))
       _ <- saveProperties(baseDirectory / ".settings" / "org.scala-ide.sdt.core.prefs", scalacOptions ++: compileOrder.map { order => Seq(("compileorder" -> order)) }.getOrElse(Nil))
+      _ <- handleJDTSettings(jdtMode, baseDirectory, jreContainer)
     } yield n
   }
 
@@ -386,6 +407,45 @@ private object Eclipse extends EclipseSDTConfig {
       case None => JreContainer
     }
 
+  def jreContainerToJdtCompilerSettings(jreContainer: String): Seq[(String, String)] = {
+    jreContainer match {
+      case JreContainerVersionSelector(version) =>
+        Seq(
+          "org.eclipse.jdt.core.compiler.codegen.targetPlatform" -> version,
+          "org.eclipse.jdt.core.compiler.compliance" -> version,
+          "org.eclipse.jdt.core.compiler.source" -> version
+        )
+      case _ =>
+        Nil
+    }
+  }
+
+  def handleJDTSettings(
+      mode: EclipseJDTMode.Value,
+      baseDirectory: File,
+      jreContainer: String
+  ): IO[Unit] = {
+    val jdtPrefs = baseDirectory / ".settings" / "org.eclipse.jdt.core.prefs"
+
+    mode match {
+      case EclipseJDTMode.Ignore =>
+        io(())
+      case EclipseJDTMode.Remove =>
+        fileExists(jdtPrefs).flatMap {
+          case false =>
+            io(())
+          case true =>
+            io {
+              jdtPrefs.delete()
+            }
+        }
+      case EclipseJDTMode.Update =>
+        updateProperties(jdtPrefs, jreContainerToJdtCompilerSettings(jreContainer))
+      case EclipseJDTMode.Overwrite =>
+        saveProperties(jdtPrefs, jreContainerToJdtCompilerSettings(jreContainer))
+    }
+  }
+
   def builderAndNatures(projectFlavor: EclipseProjectFlavor.Value) =
     if (projectFlavor.id == EclipseProjectFlavor.ScalaIDE.id)
       ScalaBuilder -> Seq(ScalaNature, JavaNature)
@@ -546,6 +606,9 @@ private object Eclipse extends EclipseSDTConfig {
   def executionEnvironment(ref: Reference, state: State): Option[EclipseExecutionEnvironment.Value] =
     setting((ref / EclipseKeys.executionEnvironment), state)
 
+  def jdtMode(ref: Reference, state: State): EclipseJDTMode.Value =
+    setting((ref / EclipseKeys.jdtMode), state)
+
   def skipParents(ref: Reference, state: State): Boolean =
     setting((ref / EclipseKeys.skipParents), state)
 
@@ -602,6 +665,45 @@ private object Eclipse extends EclipseSDTConfig {
     } else
       io(())
 
+  def updateProperties(file: File, settings: Seq[(String, String)]): IO[Unit] =
+    if (!settings.isEmpty) {
+      fileExists(file).flatMap {
+        case false =>
+          saveProperties(file, settings)
+        case true =>
+          fileReader(file)
+            .bracket(closeReader) { reader =>
+              io {
+                val properties = new Properties
+                properties.load(reader)
+                properties
+              }
+            }
+            .flatMap { properties =>
+              // only write if updates were made
+              val write = (for {
+                (key, value) <- settings
+                update = {
+                  if (properties.getProperty(key) != value) {
+                    properties.setProperty(key, value)
+                    true
+                  } else
+                    false
+                }
+              } yield update).fold(false)(_ || _)
+
+              if (write) {
+                fileWriter(file).bracket(closeWriter) { writer =>
+                  io(properties.store(writer, "Updated by sbteclipse"))
+                }
+              } else {
+                io(())
+              }
+            }
+      }
+    } else
+      io(())
+
   def fileWriter(file: File): IO[FileWriter] =
     io(new FileWriter(file))
 
@@ -614,6 +716,15 @@ private object Eclipse extends EclipseSDTConfig {
   def closeWriter(writer: Writer): IO[Unit] =
     io(writer.close())
 
+  def fileExists(file: File): IO[Boolean] =
+    io(file.exists())
+
+  def fileReader(file: File): IO[FileReader] =
+    io(new FileReader(file))
+
+  def closeReader(reader: Reader): IO[Unit] =
+    io(reader.close())
+
   private def io[T](t: => T): IO[T] = scalaz.effect.IO(t)
 
   // Utilities
diff --git a/src/main/scala/com/typesafe/sbteclipse/core/EclipseOpts.scala b/src/main/scala/com/typesafe/sbteclipse/core/EclipseOpts.scala
index 8a9be5b..4364d4f 100644
--- a/src/main/scala/com/typesafe/sbteclipse/core/EclipseOpts.scala
+++ b/src/main/scala/com/typesafe/sbteclipse/core/EclipseOpts.scala
@@ -22,6 +22,8 @@ private object EclipseOpts {
 
   val ExecutionEnvironment = "execution-environment"
 
+  val JDTMode = "jdt-mode"
+
   val SkipParents = "skip-parents"
 
   val WithSource = "with-source"
diff --git a/src/main/scala/com/typesafe/sbteclipse/core/EclipsePlugin.scala b/src/main/scala/com/typesafe/sbteclipse/core/EclipsePlugin.scala
index 9dca61b..47e039b 100644
--- a/src/main/scala/com/typesafe/sbteclipse/core/EclipsePlugin.scala
+++ b/src/main/scala/com/typesafe/sbteclipse/core/EclipsePlugin.scala
@@ -72,6 +72,7 @@ object EclipsePlugin {
       withSource := true,
       withJavadoc := true,
       projectFlavor := EclipseProjectFlavor.ScalaIDE,
+      jdtMode := EclipseJDTMode.Ignore,
       createSrc := EclipseCreateSrc.Default,
       eclipseOutput := None,
       relativizeLibs := true)
@@ -175,6 +176,10 @@ object EclipsePlugin {
       prefix("project-flavor"),
       "The flavor of project (Scala or Java) to build.")
 
+    val jdtMode: SettingKey[EclipseJDTMode.Value] = SettingKey(
+      prefix("jdt-mode"),
+      "How to handle setting Java compiler target in org.eclipse.jdt.core.prefs (Ignore, Remove, Update, Overwrite).")
+
     val eclipseOutput: SettingKey[Option[String]] = SettingKey(
       prefix("eclipse-output"),
       "The optional output for Eclipse.")
@@ -333,6 +338,37 @@ object EclipsePlugin {
     def createTransformer(ref: ProjectRef, state: State): Validation[A]
   }
 
+  object EclipseJDTMode extends Enumeration {
+
+    /**
+     * Do not touch the the .prefs file at all.
+     */
+    val Ignore = Value
+
+    /**
+     * If the file exists, remove it.
+     * Allows cleansing all JDT settings that got written by e.g. the LSP.
+     */
+    val Remove = Value
+
+    /**
+     * Write the Java compiler target settings, but maintain any other settings.
+     */
+    val Update = Value
+
+    /**
+     * Write a new file with only the Java compiler target settings.
+     * In a VSCode context, this makes the compiler settings work correctly but
+     * protects against e.g. outdated formatter settings (which the LSP injects)
+     * persisting.
+     * After LSP restart formatter settings will return, but are refreshed from
+     * the xml profile instead.
+     */
+    val Overwrite = Value
+
+    val valueSeq: Seq[Value] =  Ignore :: Remove :: Update :: Overwrite :: Nil
+  }
+
   object EclipseClasspathEntryTransformerFactory {
 
     object Identity extends EclipseTransformerFactory[Seq[EclipseClasspathEntry] => Seq[EclipseClasspathEntry]] {
diff --git a/src/sbt-test/sbteclipse/08-jdt-settings/.gitignore b/src/sbt-test/sbteclipse/08-jdt-settings/.gitignore
new file mode 100644
index 0000000..5fcbd56
--- /dev/null
+++ b/src/sbt-test/sbteclipse/08-jdt-settings/.gitignore
@@ -0,0 +1 @@
+!.settings
diff --git a/src/sbt-test/sbteclipse/08-jdt-settings/b/expected b/src/sbt-test/sbteclipse/08-jdt-settings/b/expected
new file mode 100644
index 0000000..f736ce2
--- /dev/null
+++ b/src/sbt-test/sbteclipse/08-jdt-settings/b/expected
@@ -0,0 +1,3 @@
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.source=1.8
+org.eclipse.jdt.core.compiler.compliance=1.8
diff --git a/src/sbt-test/sbteclipse/08-jdt-settings/build.sbt b/src/sbt-test/sbteclipse/08-jdt-settings/build.sbt
new file mode 100644
index 0000000..77bcea7
--- /dev/null
+++ b/src/sbt-test/sbteclipse/08-jdt-settings/build.sbt
@@ -0,0 +1,92 @@
+
+val check = TaskKey[Unit]("check") := {
+  import java.util.Properties
+  import java.io.FileInputStream
+  import scala.collection.JavaConverters._
+
+  val s: TaskStreams = streams.value
+  val expectedFile = baseDirectory.value / "expected"
+  val resultFile = baseDirectory.value / ".settings" / "org.eclipse.jdt.core.prefs"
+
+  if (expectedFile.exists()) {
+    val expectedIn = new FileInputStream(expectedFile)
+    val expected =
+      try {
+        val prop = new Properties()
+        prop.load(expectedIn)
+        prop.asScala.toMap
+      } finally {
+        expectedIn.close()
+      }
+
+    val resultIn = new FileInputStream(resultFile)
+    val result =
+      try {
+        val prop = new Properties()
+        prop.load(resultIn)
+        prop.asScala.toMap
+      } finally {
+        resultIn.close()
+      }
+
+    if (expected == result)
+      s.log.info(s"correct data: ${resultFile}")
+    else
+      sys.error("Expected settings to be '%s', but was '%s'!".format(expected, result))
+  }
+}
+
+// ensure org.eclipse.core.resources.prefs will always be generated
+ThisBuild / scalacOptions ++= Seq("-encoding", "utf-8")
+
+// check that no JDT file is generated (default ignore, no runtime defined)
+lazy val projectA = (project in file("a"))
+  .settings(
+    check
+  )
+
+// check that a new and correct JDT file is generated
+lazy val projectB = (project in file("b"))
+  .settings(
+    EclipseKeys.executionEnvironment := Some(EclipseExecutionEnvironment.JavaSE18),
+    EclipseKeys.jdtMode := EclipseJDTMode.Update,
+    check
+  )
+
+// check that a correct JDT file is is not updated
+lazy val projectC = (project in file("c"))
+  .settings(
+    EclipseKeys.executionEnvironment := Some(EclipseExecutionEnvironment.JavaSE11),
+    EclipseKeys.jdtMode := EclipseJDTMode.Update,
+    check
+  )
+
+// check that an outdated JDT file is selectively updated
+lazy val projectD = (project in file("d"))
+  .settings(
+    EclipseKeys.executionEnvironment := Some(EclipseExecutionEnvironment.JavaSE_17),
+    EclipseKeys.jdtMode := EclipseJDTMode.Update,
+    check
+  )
+
+// check that a JDT file is overwritten
+lazy val projectE = (project in file("e"))
+  .settings(
+    EclipseKeys.executionEnvironment := Some(EclipseExecutionEnvironment.JavaSE11),
+    EclipseKeys.jdtMode := EclipseJDTMode.Overwrite,
+    check
+  )
+
+// check that an JDT file is removed
+lazy val projectF = (project in file("f"))
+  .settings(
+    EclipseKeys.jdtMode := EclipseJDTMode.Remove,
+    check
+  )
+
+// check that an JDT file is default ignored, but written on command
+lazy val projectG = (project in file("g"))
+  .settings(
+    EclipseKeys.executionEnvironment := Some(EclipseExecutionEnvironment.JavaSE18),
+    check
+  )
diff --git a/src/sbt-test/sbteclipse/08-jdt-settings/c/.settings/org.eclipse.jdt.core.prefs b/src/sbt-test/sbteclipse/08-jdt-settings/c/.settings/org.eclipse.jdt.core.prefs
new file mode 100644
index 0000000..7fc5c6f
--- /dev/null
+++ b/src/sbt-test/sbteclipse/08-jdt-settings/c/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1,4 @@
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=11
+org.eclipse.jdt.core.compiler.source=11
+org.eclipse.jdt.core.compiler.compliance=11
+dummy.key=abc
diff --git a/src/sbt-test/sbteclipse/08-jdt-settings/c/expected b/src/sbt-test/sbteclipse/08-jdt-settings/c/expected
new file mode 100644
index 0000000..7fc5c6f
--- /dev/null
+++ b/src/sbt-test/sbteclipse/08-jdt-settings/c/expected
@@ -0,0 +1,4 @@
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=11
+org.eclipse.jdt.core.compiler.source=11
+org.eclipse.jdt.core.compiler.compliance=11
+dummy.key=abc
diff --git a/src/sbt-test/sbteclipse/08-jdt-settings/d/.settings/org.eclipse.jdt.core.prefs b/src/sbt-test/sbteclipse/08-jdt-settings/d/.settings/org.eclipse.jdt.core.prefs
new file mode 100644
index 0000000..7fc5c6f
--- /dev/null
+++ b/src/sbt-test/sbteclipse/08-jdt-settings/d/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1,4 @@
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=11
+org.eclipse.jdt.core.compiler.source=11
+org.eclipse.jdt.core.compiler.compliance=11
+dummy.key=abc
diff --git a/src/sbt-test/sbteclipse/08-jdt-settings/d/expected b/src/sbt-test/sbteclipse/08-jdt-settings/d/expected
new file mode 100644
index 0000000..23a0c69
--- /dev/null
+++ b/src/sbt-test/sbteclipse/08-jdt-settings/d/expected
@@ -0,0 +1,4 @@
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=17
+org.eclipse.jdt.core.compiler.source=17
+org.eclipse.jdt.core.compiler.compliance=17
+dummy.key=abc
diff --git a/src/sbt-test/sbteclipse/08-jdt-settings/e/.settings/org.eclipse.jdt.core.prefs b/src/sbt-test/sbteclipse/08-jdt-settings/e/.settings/org.eclipse.jdt.core.prefs
new file mode 100644
index 0000000..7fc5c6f
--- /dev/null
+++ b/src/sbt-test/sbteclipse/08-jdt-settings/e/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1,4 @@
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=11
+org.eclipse.jdt.core.compiler.source=11
+org.eclipse.jdt.core.compiler.compliance=11
+dummy.key=abc
diff --git a/src/sbt-test/sbteclipse/08-jdt-settings/e/expected b/src/sbt-test/sbteclipse/08-jdt-settings/e/expected
new file mode 100644
index 0000000..3bc34e2
--- /dev/null
+++ b/src/sbt-test/sbteclipse/08-jdt-settings/e/expected
@@ -0,0 +1,3 @@
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=11
+org.eclipse.jdt.core.compiler.source=11
+org.eclipse.jdt.core.compiler.compliance=11
diff --git a/src/sbt-test/sbteclipse/08-jdt-settings/f/.settings/org.eclipse.jdt.core.prefs b/src/sbt-test/sbteclipse/08-jdt-settings/f/.settings/org.eclipse.jdt.core.prefs
new file mode 100644
index 0000000..7fc5c6f
--- /dev/null
+++ b/src/sbt-test/sbteclipse/08-jdt-settings/f/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1,4 @@
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=11
+org.eclipse.jdt.core.compiler.source=11
+org.eclipse.jdt.core.compiler.compliance=11
+dummy.key=abc
diff --git a/src/sbt-test/sbteclipse/08-jdt-settings/g/.settings/org.eclipse.jdt.core.prefs b/src/sbt-test/sbteclipse/08-jdt-settings/g/.settings/org.eclipse.jdt.core.prefs
new file mode 100644
index 0000000..ccb0942
--- /dev/null
+++ b/src/sbt-test/sbteclipse/08-jdt-settings/g/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1 @@
+dummy.key=abc
diff --git a/src/sbt-test/sbteclipse/08-jdt-settings/g/expected b/src/sbt-test/sbteclipse/08-jdt-settings/g/expected
new file mode 100644
index 0000000..ccb0942
--- /dev/null
+++ b/src/sbt-test/sbteclipse/08-jdt-settings/g/expected
@@ -0,0 +1 @@
+dummy.key=abc
diff --git a/src/sbt-test/sbteclipse/08-jdt-settings/project/plugins.sbt b/src/sbt-test/sbteclipse/08-jdt-settings/project/plugins.sbt
new file mode 100644
index 0000000..542d181
--- /dev/null
+++ b/src/sbt-test/sbteclipse/08-jdt-settings/project/plugins.sbt
@@ -0,0 +1,7 @@
+{
+  val pluginVersion = System.getProperty("plugin.version")
+  if(pluginVersion == null)
+    throw new RuntimeException("""|The system property 'plugin.version' is not defined.
+                                  |Specify this property using the scriptedLaunchOpts -D.""".stripMargin)
+  else addSbtPlugin("com.github.sbt" % "sbt-eclipse" % pluginVersion)
+}
diff --git a/src/sbt-test/sbteclipse/08-jdt-settings/test b/src/sbt-test/sbteclipse/08-jdt-settings/test
new file mode 100644
index 0000000..2e764ee
--- /dev/null
+++ b/src/sbt-test/sbteclipse/08-jdt-settings/test
@@ -0,0 +1,62 @@
+# timestamp marker file 
+$ touch marker
+
+$ exists f/.settings/org.eclipse.jdt.core.prefs
+
+> eclipse
+
+> check
+
+$ exists a/.settings/org.eclipse.core.resources.prefs
+-$ exists a/.settings/org.eclipse.jdt.core.prefs
+
+$ exists b/.settings/org.eclipse.jdt.core.prefs
+$ newer b/.settings/org.eclipse.jdt.core.prefs marker
+
+$ exists c/.settings/org.eclipse.jdt.core.prefs
+$ newer marker c/.settings/org.eclipse.jdt.core.prefs
+
+$ exists d/.settings/org.eclipse.jdt.core.prefs
+$ newer d/.settings/org.eclipse.jdt.core.prefs marker
+
+$ exists e/.settings/org.eclipse.jdt.core.prefs
+$ newer e/.settings/org.eclipse.jdt.core.prefs marker
+
+$ exists f/.settings/org.eclipse.core.resources.prefs
+-$ exists f/.settings/org.eclipse.jdt.core.prefs
+
+$ exists g/.settings/org.eclipse.jdt.core.prefs
+$ newer marker g/.settings/org.eclipse.jdt.core.prefs
+
+# test overwrite mode via command arg
+$ touch marker
+> eclipse jdt-mode=Overwrite
+# no runtime defined for a
+-$ exists a/.settings/org.eclipse.jdt.core.prefs
+$ newer b/.settings/org.eclipse.jdt.core.prefs marker
+$ newer c/.settings/org.eclipse.jdt.core.prefs marker
+$ newer d/.settings/org.eclipse.jdt.core.prefs marker
+$ newer e/.settings/org.eclipse.jdt.core.prefs marker
+-$ exists f/.settings/org.eclipse.jdt.core.prefs
+$ newer g/.settings/org.eclipse.jdt.core.prefs marker
+
+# test ignore mode via command arg
+$ touch marker
+> eclipse jdt-mode=Ignore
+-$ exists a/.settings/org.eclipse.jdt.core.prefs
+$ newer marker b/.settings/org.eclipse.jdt.core.prefs
+$ newer marker c/.settings/org.eclipse.jdt.core.prefs
+$ newer marker d/.settings/org.eclipse.jdt.core.prefs
+$ newer marker e/.settings/org.eclipse.jdt.core.prefs
+-$ exists f/.settings/org.eclipse.jdt.core.prefs
+$ newer marker g/.settings/org.eclipse.jdt.core.prefs
+
+# test remove mode via command arg
+> eclipse jdt-mode=Remove
+-$ exists a/.settings/org.eclipse.jdt.core.prefs
+-$ exists b/.settings/org.eclipse.jdt.core.prefs
+-$ exists c/.settings/org.eclipse.jdt.core.prefs
+-$ exists d/.settings/org.eclipse.jdt.core.prefs
+-$ exists e/.settings/org.eclipse.jdt.core.prefs
+-$ exists f/.settings/org.eclipse.jdt.core.prefs
+-$ exists g/.settings/org.eclipse.jdt.core.prefs