Fixed bug when checking native methods

git-svn-id: https://pmd.svn.sourceforge.net/svnroot/pmd/trunk@545 51baf565-9d33-0410-a72c-fc3788e3496d

pmd/src/net/sourceforge/pmd/rules/UnusedFormalParameterRule.java

@@ -43,7 +43,7 @@ public class UnusedFormalParameterRule extends AbstractRule {
     }
 
     public Object visit(ASTMethodDeclaration node, Object data) {
-        if (node.isPrivate()) {
+        if (node.isPrivate() && ! node.isNative()) {  //make sure it's a private method and not a native method
             SimpleNode md = (SimpleNode)node.jjtGetChild(1);
             SimpleNode formalParams = (SimpleNode)md.jjtGetChild(0);
             int paramCount = formalParams.jjtGetNumChildren();

pmd/test-data/UnusedFormalParam1.java

@@ -2,9 +2,11 @@
 
 class UnusedFormalParam1 {
     private void testMethod(String param1) {
-
+        //System.out.println(param1);
     }
 
+    private native int testNativeMethod(String param1);
+
     private void t2(){
 
     }