fix bug in getters predicate

Author: wakingrufus

archrules-gradle-plugin-development/src/archRules/java/com/netflix/nebula/archrules/gradleplugins/Predicates.java

@@ -36,7 +36,7 @@ public boolean test(JavaMethod input) {
                 return false;
             }
             if (input.getName().startsWith("get")) {
-                if (Character.isLowerCase(input.getName().charAt(3))) {
+                if (input.getName().length() < 4 || Character.isLowerCase(input.getName().charAt(3))) {
                     return false;
                 }
                 return true;

archrules-gradle-plugin-development/src/archRulesTest/java/com/netflix/nebula/archrules/gradleplugins/PredicatesTest.java

@@ -37,4 +37,17 @@ public void test_annotatedWithFileInputAnnotation() {
                 scan(GradleTaskCacheabilityRuleTest.CacheableTaskWithoutPathSensitive.class).getField("inputFile"))
         ).isTrue();
     }
+
+    @Test
+    public void test_getters_get() {
+        assertThat(Predicates.getters.test(scan(AClass.class).getMethod("get"))).isFalse();
+    }
+
+
+    static class AClass {
+        @SuppressWarnings("unused")
+        public String get() {
+            return "";
+        }
+    }
 }