avoid completing new HashSet<String><String>();

java/java-impl/src/com/intellij/codeInsight/completion/ConstructorInsertHandler.java

@@ -77,6 +77,19 @@ public class ConstructorInsertHandler implements InsertHandler<LookupElementDeco
                      psiClass.getTypeParameters().length > 0 &&
                      ((PsiTypeLookupItem)delegate).calcGenerics(position, context).isEmpty() &&
                      context.getCompletionChar() != '(';
+
+      if (context.getDocument().getTextLength() > context.getTailOffset() &&
+          context.getDocument().getCharsSequence().charAt(context.getTailOffset()) == '<') {
+        PsiJavaCodeReferenceElement ref = PsiTreeUtil.findElementOfClassAtOffset(context.getFile(), context.getTailOffset(), PsiJavaCodeReferenceElement.class, false);
+        if (ref != null) {
+          PsiReferenceParameterList parameterList = ref.getParameterList();
+          if (parameterList != null && context.getTailOffset() == parameterList.getTextRange().getStartOffset()) {
+            context.getDocument().deleteString(parameterList.getTextRange().getStartOffset(), parameterList.getTextRange().getEndOffset());
+            context.commitDocument();
+          }
+        }
+      }
+
       delegate.handleInsert(context);
       PostprocessReformattingAspect.getInstance(context.getProject()).doPostponedFormatting(context.getFile().getViewProvider());
     }
@@ -85,6 +98,7 @@ public class ConstructorInsertHandler implements InsertHandler<LookupElementDeco
       PsiTypeLookupItem.addImportForItem(context, psiClass);
     }
 
+
     insertParentheses(context, delegate, psiClass, !inAnonymous && isAbstract);
 
     if (inAnonymous) {

java/java-tests/testData/codeInsight/completion/normal/OverwriteGenericsAfterNew.java

@@ -0,0 +1,6 @@
+class Bar {
+  {
+    Koo<String> hs = new Ko<caret><StringX>();
+  }
+}
+class Koo<X> {}

java/java-tests/testData/codeInsight/completion/normal/OverwriteGenericsAfterNew_after.java

@@ -0,0 +1,6 @@
+class Bar {
+  {
+    Koo<String> hs = new Koo<String>()<caret>;
+  }
+}
+class Koo<X> {}

java/java-tests/testSrc/com/intellij/codeInsight/completion/NormalCompletionTest.groovy

@@ -1339,6 +1339,7 @@ public class ListUtils {
   public void testInterfaceImplementationNoCast() { doTest() }
   public void testStaticallyImportedMethodsBeforeExpression() { doTest() }
   public void testInnerChainedReturnType() { doTest() }
+  public void testOverwriteGenericsAfterNew() { doTest('\n') }
 
   private CommonCodeStyleSettings getCodeStyleSettings() {
     return CodeStyleSettingsManager.getSettings(getProject()).getCommonSettings(JavaLanguage.INSTANCE);