diff --git a/jps/jps-builders/src/org/jetbrains/jps/cmdline/BuildSession.java b/jps/jps-builders/src/org/jetbrains/jps/cmdline/BuildSession.java
index a8468ef15d55..b1ffe29b9788 100644
--- a/jps/jps-builders/src/org/jetbrains/jps/cmdline/BuildSession.java
+++ b/jps/jps-builders/src/org/jetbrains/jps/cmdline/BuildSession.java
@@ -139,13 +139,16 @@ final class BuildSession implements Runnable, CanceledStatus {
             CustomBuilderMessage builderMessage = (CustomBuilderMessage)buildMessage;
             response = CmdlineProtoUtil.createCustomBuilderMessage(builderMessage.getBuilderId(), builderMessage.getMessageType(), builderMessage.getMessageText());
           }
-          else {
+          else if (!(buildMessage instanceof BuildingTargetProgressMessage)) {
             float done = -1.0f;
             if (buildMessage instanceof ProgressMessage) {
               done = ((ProgressMessage)buildMessage).getDone();
             }
             response = CmdlineProtoUtil.createCompileProgressMessageResponse(buildMessage.getMessageText(), done);
           }
+          else {
+            response = null;
+          }
           if (response != null) {
             Channels.write(myChannel, CmdlineProtoUtil.toMessage(mySessionId, response));
           }
diff --git a/jps/jps-builders/src/org/jetbrains/jps/incremental/IncProjectBuilder.java b/jps/jps-builders/src/org/jetbrains/jps/incremental/IncProjectBuilder.java
index 2e6a288e900d..bac5deac1608 100644
--- a/jps/jps-builders/src/org/jetbrains/jps/incremental/IncProjectBuilder.java
+++ b/jps/jps-builders/src/org/jetbrains/jps/incremental/IncProjectBuilder.java
@@ -809,6 +809,7 @@ public class IncProjectBuilder {
   private void buildTargetsChunk(CompileContext context, final BuildTargetChunk chunk) throws ProjectBuildException {
     boolean doneSomething;
     try {
+      sendBuildingTargetMessages(chunk.getTargets(), BuildingTargetProgressMessage.Event.STARTED);
       Utils.ERRORS_DETECTED_KEY.set(context, Boolean.FALSE);
 
       for (BuildTarget<?> target : chunk.getTargets()) {
@@ -864,9 +865,14 @@ public class IncProjectBuilder {
       finally {
         Utils.REMOVED_SOURCES_KEY.set(context, null);
       }
+      sendBuildingTargetMessages(chunk.getTargets(), BuildingTargetProgressMessage.Event.FINISHED);
     }
   }
 
+  private void sendBuildingTargetMessages(@NotNull Set<? extends BuildTarget<?>> targets, @NotNull BuildingTargetProgressMessage.Event event) {
+    myMessageDispatcher.processMessage(new BuildingTargetProgressMessage(targets, event));
+  }
+
   private static void createClasspathIndex(final BuildTargetChunk chunk) {
     final Set<File> outputDirs = new THashSet<File>(FileUtil.FILE_HASHING_STRATEGY);
     for (BuildTarget<?> target : chunk.getTargets()) {
@@ -992,6 +998,7 @@ public class IncProjectBuilder {
 
   // return true if changed something, false otherwise
   private boolean runModuleLevelBuilders(final CompileContext context, final ModuleChunk chunk) throws ProjectBuildException, IOException {
+    sendBuildingTargetMessages(chunk.getTargets(), BuildingTargetProgressMessage.Event.STARTED);
     for (BuilderCategory category : BuilderCategory.values()) {
       for (ModuleLevelBuilder builder : myBuilderRegistry.getBuilders(category)) {
         builder.chunkBuildStarted(context, chunk);
@@ -1105,6 +1112,7 @@ public class IncProjectBuilder {
           builder.chunkBuildFinished(context, chunk);
         }
       }
+      sendBuildingTargetMessages(chunk.getTargets(), BuildingTargetProgressMessage.Event.FINISHED);
     }
 
     return doneSomething;
diff --git a/jps/jps-builders/src/org/jetbrains/jps/incremental/messages/BuildingTargetProgressMessage.java b/jps/jps-builders/src/org/jetbrains/jps/incremental/messages/BuildingTargetProgressMessage.java
new file mode 100644
index 000000000000..50399f74baab
--- /dev/null
+++ b/jps/jps-builders/src/org/jetbrains/jps/incremental/messages/BuildingTargetProgressMessage.java
@@ -0,0 +1,47 @@
+package org.jetbrains.jps.incremental.messages;
+
+import com.intellij.openapi.util.text.StringUtil;
+import com.intellij.util.NotNullFunction;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.jps.builders.BuildTarget;
+
+import java.util.Collection;
+
+/**
+ * @author nik
+ */
+public class BuildingTargetProgressMessage extends BuildMessage {
+  private final Collection<? extends BuildTarget<?>> myTargets;
+  @NotNull private final Event myEventType;
+
+  public enum Event {
+    STARTED, FINISHED
+  }
+
+  public BuildingTargetProgressMessage(@NotNull Collection<? extends BuildTarget<?>> targets, @NotNull Event event) {
+    super(composeMessageText(targets, event), Kind.PROGRESS);
+    myTargets = targets;
+    myEventType = event;
+  }
+
+  private static String composeMessageText(Collection<? extends BuildTarget<?>> targets, Event event) {
+    String targetsString = StringUtil.join(targets, new NotNullFunction<BuildTarget<?>, String>() {
+      @NotNull
+      @Override
+      public String fun(BuildTarget<?> dom) {
+        return dom.getPresentableName();
+      }
+    }, ", ");
+    return (event == Event.STARTED ? "Started" : "Finished") + " building " + targetsString;
+  }
+
+  @NotNull
+  public Collection<? extends BuildTarget<?>> getTargets() {
+    return myTargets;
+  }
+
+  @NotNull
+  public Event getEventType() {
+    return myEventType;
+  }
+}
diff --git a/platform/util/src/com/intellij/openapi/util/text/StringUtil.java b/platform/util/src/com/intellij/openapi/util/text/StringUtil.java
index 4c92428e47d4..a1bc3a9b87e1 100644
--- a/platform/util/src/com/intellij/openapi/util/text/StringUtil.java
+++ b/platform/util/src/com/intellij/openapi/util/text/StringUtil.java
@@ -1183,9 +1183,9 @@ public class StringUtil extends StringUtilRt {
   }
 
   @NotNull
-  public static <T> String join(@NotNull Collection<T> items, @NotNull Function<T, String> f, @NotNull @NonNls String separator) {
+  public static <T> String join(@NotNull Collection<? extends T> items, @NotNull Function<? super T, String> f, @NotNull @NonNls String separator) {
     if (items.isEmpty()) return "";
-    return join((Iterable<T>)items, f, separator);
+    return join((Iterable<? extends T>)items, f, separator);
   }
 
   public static String join(@NotNull Iterable<?> items, @NotNull @NonNls String separator) {
@@ -1200,7 +1200,7 @@ public class StringUtil extends StringUtilRt {
   }
 
   @NotNull
-  public static <T> String join(@NotNull Iterable<T> items, @NotNull Function<T, String> f, @NotNull @NonNls String separator) {
+  public static <T> String join(@NotNull Iterable<? extends T> items, @NotNull Function<? super T, String> f, @NotNull @NonNls String separator) {
     final StringBuilder result = new StringBuilder();
     for (T item : items) {
       String string = f.fun(item);