diff --git a/java/compiler/impl/src/com/intellij/compiler/CompilerConfigurationImpl.java b/java/compiler/impl/src/com/intellij/compiler/CompilerConfigurationImpl.java
index 5c57b8383f66..cbbcb7ac3002 100644
--- a/java/compiler/impl/src/com/intellij/compiler/CompilerConfigurationImpl.java
+++ b/java/compiler/impl/src/com/intellij/compiler/CompilerConfigurationImpl.java
@@ -29,6 +29,7 @@ import com.intellij.compiler.impl.javaCompiler.eclipse.EclipseCompiler;
 import com.intellij.compiler.impl.javaCompiler.eclipse.EclipseEmbeddedCompiler;
 import com.intellij.compiler.impl.javaCompiler.javac.JavacCompiler;
 import com.intellij.compiler.impl.javaCompiler.jikes.JikesCompiler;
+import com.intellij.compiler.server.BuildManager;
 import com.intellij.openapi.application.ApplicationManager;
 import com.intellij.openapi.application.ApplicationNamesInfo;
 import com.intellij.openapi.application.ex.ApplicationManagerEx;
@@ -59,6 +60,7 @@ import org.jetbrains.annotations.NonNls;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import javax.swing.*;
 import java.io.File;
 import java.util.*;
 
@@ -169,6 +171,27 @@ public class CompilerConfigurationImpl extends CompilerConfiguration implements
     return myModuleBytecodeTarget;
   }
 
+  public void setBytecodeTargetLevel(Module module, String level) {
+    final String previous;
+    if (StringUtil.isEmpty(level)) {
+      previous = myModuleBytecodeTarget.remove(module.getName());
+    }
+    else {
+      previous = myModuleBytecodeTarget.put(module.getName(), level);
+    }
+    if (!Comparing.equal(previous, level)) {
+      final Project project = module.getProject();
+      SwingUtilities.invokeLater(new Runnable() {
+        public void run() {
+          if (!project.isDisposed()) {
+            CompileServerManager.getInstance().sendReloadRequest(project);
+            BuildManager.getInstance().clearState(project);
+          }
+        }
+      });
+    }
+  }
+
   @Override
   @Nullable
   public String getBytecodeTargetLevel(Module module) {
diff --git a/java/compiler/openapi/src/com/intellij/compiler/CompilerConfiguration.java b/java/compiler/openapi/src/com/intellij/compiler/CompilerConfiguration.java
index f2b8d46c24ea..12e5d3354995 100644
--- a/java/compiler/openapi/src/com/intellij/compiler/CompilerConfiguration.java
+++ b/java/compiler/openapi/src/com/intellij/compiler/CompilerConfiguration.java
@@ -33,6 +33,8 @@ public abstract class CompilerConfiguration {
   @Nullable
   public abstract String getBytecodeTargetLevel(Module module);
 
+  public abstract void setBytecodeTargetLevel(Module module, String level);
+
   public static CompilerConfiguration getInstance(Project project) {
     return project.getComponent(CompilerConfiguration.class);
   }
@@ -72,5 +74,4 @@ public abstract class CompilerConfiguration {
   public abstract boolean isAnnotationProcessingEnabled(Module module);
 
   public abstract String getGeneratedSourceDirName(Module module);
-
 }
\ No newline at end of file