New J2K: do not merge methods if there are vararg parameters present

nj2k/src/org/jetbrains/kotlin/nj2k/conversions/DefaultArgumentsConversion.kt

@@ -48,6 +48,8 @@ class DefaultArgumentsConversion(context: NewJ2kConverterContext) : RecursiveApp
                 || callee.name != method.name.value
                 || calledMethod.returnType.type != method.returnType.type
                 || call.arguments.arguments.size <= method.parameters.size
+                || call.arguments.arguments.size < calledMethod.parameters.size //calledMethod has varargs param or call expr has errors
+                || calledMethod.parameters.any(JKParameter::isVarArgs)
             ) {
                 continue
             }
@@ -141,7 +143,6 @@ class DefaultArgumentsConversion(context: NewJ2kConverterContext) : RecursiveApp
         }
 
         return recurse(element)
-
     }
 
     private fun areTheSameExpressions(first: JKElement, second: JKElement): Boolean {

nj2k/testData/newJ2k/methodCallExpression/defaultParamsWithVararg.java

@@ -0,0 +1,8 @@
+public final class Test {
+    public static void checkState(boolean condition, String message, Object... args) {
+    }
+
+    public static void checkState(boolean condition) {
+        checkState(condition, "condition not met");
+    }
+}

nj2k/testData/newJ2k/methodCallExpression/defaultParamsWithVararg.kt

@@ -0,0 +1,6 @@
+object Test {
+    fun checkState(condition: Boolean, message: String?, vararg args: Any?) {}
+    fun checkState(condition: Boolean) {
+        checkState(condition, "condition not met")
+    }
+}

nj2k/tests/org/jetbrains/kotlin/nj2k/NewJavaToKotlinConverterSingleFileTestGenerated.java

@@ -3591,6 +3591,11 @@ public class NewJavaToKotlinConverterSingleFileTestGenerated extends AbstractNew
             runTest("nj2k/testData/newJ2k/methodCallExpression/conflictJavaMethodCallWithExplicitImports.java");
         }
 
+        @TestMetadata("defaultParamsWithVararg.java")
+        public void testDefaultParamsWithVararg() throws Exception {
+            runTest("nj2k/testData/newJ2k/methodCallExpression/defaultParamsWithVararg.java");
+        }
+
         @TestMetadata("emptyCall.java")
         public void testEmptyCall() throws Exception {
             runTest("nj2k/testData/newJ2k/methodCallExpression/emptyCall.java");