Replace deprecated Class#newInstance calls

Author: matthiasblaesing

CHANGES.md

@@ -9,6 +9,7 @@ Features
 --------
 * [#1029](https://github.com/java-native-access/jna/issues/1029): Add `statvfs` to `c.s.j.platform.linux.LibC` - [@dbwiddis](https://github.com/dbwiddis).
 * [#1032](https://github.com/java-native-access/jna/pull/1032): Deprecate `c.s.j.platform.win32.COM.util.annotation.ComEventCallback` in favour of `c.s.j.platform.win32.COM.util.annotation.ComMethod` - [@matthiasblaesing](https://github.com/matthiasblaesing).
+* [#1033](https://github.com/java-native-access/jna/pull/1033): Replace deprecated Class#newInstance calls
 
 Bug Fixes
 ---------

contrib/platform/test/com/sun/jna/platform/win32/WinspoolTest.java

@@ -118,7 +118,7 @@ public void testCorrectDeclarationOfMembers() throws InstantiationException, Ill
             if(Structure.class.isAssignableFrom(klass)) {
                 boolean writeWorked = false;
                 try {
-                    Structure struct = (Structure) klass.newInstance();
+                    Structure struct = Structure.newInstance((Class<? extends Structure>) klass);
                     struct.write();
                     writeWorked = true;
                 } catch (java.lang.Throwable ex) {

test/com/sun/jna/StructureTest.java

@@ -390,7 +390,7 @@ private void testAlignStruct(String prefix,int index) {
             IntByReference offset = new IntByReference();
             LongByReference value = new LongByReference();
             Class<?> cls = Class.forName(getClass().getName() + "$" + prefix + "TestStructure" + index);
-            Structure s = (Structure)cls.newInstance();
+            Structure s = Structure.newInstance((Class<? extends Structure>) cls);
             int result = lib.testStructureAlignment(s, index, offset, value);
             assertEquals("Wrong native value at field " + result
                          + "=0x" + Long.toHexString(value.getValue())

test/com/sun/jna/WebStartTest.java

@@ -417,7 +417,7 @@ private static void sendResults(Throwable t, int port) throws IOException {
     }
 
     private static Throwable runTestCaseTest(String testClass, String method, int port) throws Exception {
-        TestCase test = (TestCase)Class.forName(testClass).newInstance();
+        TestCase test = (TestCase)Class.forName(testClass).getConstructor().newInstance();
         test.setName(method);
         TestResult result = new TestResult();
         test.run(result);