exception inference: don't check non-applicable methods (IDEA-178762)

java/java-psi-impl/src/com/intellij/codeInsight/ExceptionUtil.java

@@ -487,13 +487,15 @@ public class ExceptionUtil {
           processor.getResults(), info -> {
             PsiElement element1 = info.getElement();
             if (info instanceof MethodCandidateInfo &&
+                element1 != method && //don't check self
                 MethodSignatureUtil.areSignaturesEqual(method, (PsiMethod)element1) &&
-                !MethodSignatureUtil.isSuperMethod((PsiMethod)element1, method)) {
+                !MethodSignatureUtil.isSuperMethod((PsiMethod)element1, method) &&
+                !(((MethodCandidateInfo)info).isToInferApplicability() && !((MethodCandidateInfo)info).isApplicable())) {
               return Pair.create((PsiMethod)element1, ((MethodCandidateInfo)info).getSubstitutor(false));
             }
             return null;
           });
-        if (candidates.size() > 1) {
+        if (!candidates.isEmpty()) {
           GlobalSearchScope scope = methodCall.getResolveScope();
           final List<PsiClassType> ex = collectSubstituted(substitutor, thrownExceptions, scope);
           for (Pair<PsiMethod, PsiSubstitutor> pair : candidates) {

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/newLambda/ExceptionInferenceForVarargMethods.java

@@ -0,0 +1,18 @@
+
+import java.io.IOException;
+
+@FunctionalInterface
+interface ThrowableRunnable<E extends Exception> {
+    
+    void get() throws E;
+
+    static <E extends Exception> void m(ThrowableRunnable<E> supplier, Object... params) throws E {}
+
+
+    default void getContent() {
+        try {
+            m(() -> { throw new IOException(); });
+        } catch (IOException e) { }
+    }
+
+}

java/java-tests/testSrc/com/intellij/java/codeInsight/daemon/lambda/NewLambdaHighlightingTest.java

@@ -162,6 +162,7 @@ public class NewLambdaHighlightingTest extends LightDaemonAnalyzerTestCase {
   public void testLambdaWithFormalTypeParameters() { doTest(); }
   public void testIDEA174924() { doTest(); }
   public void testVoidValueCompatibilityWithBreakInSwitch() { doTest(); }
+  public void testExceptionInferenceForVarargMethods() { doTest(); }
 
   private void doTest() {
     IdeaTestUtil.setTestVersion(JavaSdkVersion.JDK_1_8, getModule(), getTestRootDisposable());