ignore unused params in main methods (IDEA-69989)

java/java-impl/src/com/intellij/codeInspection/unusedParameters/UnusedParametersInspection.java

@@ -31,6 +31,7 @@ import com.intellij.codeInspection.*;
 import com.intellij.codeInspection.reference.*;
 import com.intellij.openapi.project.Project;
 import com.intellij.psi.*;
+import com.intellij.psi.impl.PsiClassImplUtil;
 import com.intellij.psi.search.PsiReferenceProcessor;
 import com.intellij.psi.search.PsiReferenceProcessorAdapter;
 import com.intellij.psi.search.PsiSearchHelper;
@@ -71,6 +72,8 @@ public class UnusedParametersInspection extends GlobalJavaInspectionTool {
 
       if (RefUtil.isEntryPoint(refMethod)) return null;
 
+      if (refMethod.isAppMain()) return null;
+
       final ArrayList<RefParameter> unusedParameters = getUnusedParameters(refMethod);
 
       if (unusedParameters.isEmpty()) return null;

java/java-tests/testData/inspection/unusedMethodParameter/appMainUnusedParams/expected.xml

@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<problems></problems>
+

java/java-tests/testData/inspection/unusedMethodParameter/appMainUnusedParams/src/Test.java

@@ -0,0 +1,4 @@
+public class Test {
+  public static void main(String[] args) {
+  }
+}

java/java-tests/testSrc/com/intellij/codeInspection/UnusedMethodParameterTest.java

@@ -41,4 +41,8 @@ public class UnusedMethodParameterTest extends InspectionTestCase {
   public void testEntryPointUnusedParameter() throws Exception {
     doTest("unusedMethodParameter/" + getTestName(true), myTool, true, true);
   }
+
+  public void testAppMainUnusedParams() throws Exception {
+    doTest();
+  }
 }