Not marking entry points as unused.

idea/src/org/jetbrains/kotlin/idea/inspections/UnusedSymbolInspection.kt

@@ -29,8 +29,12 @@ import org.jetbrains.kotlin.idea.search.usagesSearch.UsagesSearch
 import com.intellij.util.Processor
 import org.jetbrains.kotlin.idea.JetBundle
 import com.intellij.codeInspection.ProblemHighlightType
+import com.intellij.codeInspection.deadCode.UnusedDeclarationInspection
+import org.jetbrains.kotlin.asJava.LightClassUtil
 
 public class UnusedSymbolInspection : AbstractKotlinInspection() {
+    private val javaInspection = UnusedDeclarationInspection()
+
     override fun runForWholeFile() = true
 
     override fun buildVisitor(holder: ProblemsHolder, isOnTheFly: Boolean, session: LocalInspectionToolSession): PsiElementVisitor {
@@ -38,6 +42,9 @@ public class UnusedSymbolInspection : AbstractKotlinInspection() {
             override fun visitClass(klass: JetClass) {
                 if (klass.getName() == null) return
 
+                val lightClass = LightClassUtil.getPsiClass(klass)
+                if (lightClass != null && javaInspection.isEntryPoint(lightClass)) return
+
                 val usagesSearchHelper = KotlinClassFindUsagesOptions(holder.getProject()).toClassHelper()
                 val request = usagesSearchHelper.newRequest(UsagesSearchTarget(klass, klass.getUseScope()))
                 val query = UsagesSearch.search(request)

idea/testData/inspections/unusedSymbol/class/unusedButEntryPointApplet.kt

@@ -0,0 +1,5 @@
+
+// WITH_RUNTIME
+open class A: java.applet.Applet()
+
+class B: A()

idea/testData/inspections/unusedSymbol/class/unusedButEntryPointMain.kt

@@ -0,0 +1,5 @@
+object EntryPoint {
+    fun main(args: Array<String>) {
+
+    }
+}