Don't search for NonClasspathClassFinder classes and package during Kotlin resolve

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/KotlinJavaPsiFacade.java

@@ -25,10 +25,7 @@ import com.intellij.openapi.roots.PackageIndex;
 import com.intellij.openapi.util.Pair;
 import com.intellij.openapi.util.text.StringUtil;
 import com.intellij.openapi.vfs.VirtualFile;
-import com.intellij.psi.PsiClass;
-import com.intellij.psi.PsiElementFinder;
-import com.intellij.psi.PsiManager;
-import com.intellij.psi.PsiPackage;
+import com.intellij.psi.*;
 import com.intellij.psi.impl.PsiElementFinderImpl;
 import com.intellij.psi.impl.file.PsiPackageImpl;
 import com.intellij.psi.impl.file.impl.JavaFileManager;
@@ -160,7 +157,7 @@ public class KotlinJavaPsiFacade {
                 getProject().getExtensions(PsiElementFinder.EP_NAME), new Function1<PsiElementFinder, Boolean>() {
                     @Override
                     public Boolean invoke(PsiElementFinder finder) {
-                        return !(finder instanceof KotlinFinderMarker || finder instanceof PsiElementFinderImpl);
+                        return !(finder instanceof NonClasspathClassFinder || finder instanceof KotlinFinderMarker || finder instanceof PsiElementFinderImpl);
                     }
                 });
 

idea/tests/org/jetbrains/kotlin/idea/RegisteredFindersTest.kt

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.idea
+
+import com.intellij.psi.NonClasspathClassFinder
+import com.intellij.psi.PsiElementFinder
+import com.intellij.testFramework.fixtures.LightCodeInsightFixtureTestCase
+import org.jetbrains.kotlin.idea.test.JetLightCodeInsightFixtureTestCase
+import org.jetbrains.kotlin.resolve.jvm.KotlinJavaPsiFacade
+import org.junit.Assert
+
+public class RegisteredFindersTest : JetLightCodeInsightFixtureTestCase() {
+    override fun getProjectDescriptor() = LightCodeInsightFixtureTestCase.JAVA_LATEST
+
+    public fun testKnownNonClasspathFinder() {
+        val expectedFindersNames = setOf("GantClassFinder", "GradleClassFinder").toMutableSet()
+
+        getProject().getExtensions<PsiElementFinder>(PsiElementFinder.EP_NAME).forEach { finder ->
+            if (finder is NonClasspathClassFinder) {
+                val name = finder.javaClass.getSimpleName()
+                val removed = expectedFindersNames.remove(name)
+                Assert.assertTrue("Unknown finder found: $finder, class name: $name, search in $expectedFindersNames.\n" +
+                                  "Consider updating ${javaClass<KotlinJavaPsiFacade>()}",
+                                  removed)
+            }
+        }
+
+        Assert.assertTrue("Some finders wasn't found: $expectedFindersNames", expectedFindersNames.isEmpty())
+    }
+}