[ci] Fix a few more checkstyle issues

Author: hazendaz

src/main/java/org/apache/ibatis/io/JBoss6VFS.java

@@ -36,7 +36,8 @@ public class JBoss6VFS extends VFS {
   /** A class that mimics a tiny subset of the JBoss VirtualFile class. */
   static class VirtualFile {
     static Class<?> VirtualFile;
-    static Method getPathNameRelativeTo, getChildrenRecursively;
+    static Method getPathNameRelativeTo;
+    static Method getChildrenRecursively;
 
     Object virtualFile;
 
@@ -138,7 +139,7 @@ protected static void checkReturnType(Method method, Class<?> expected) {
 
   /** Mark this {@link VFS} as invalid for the current environment. */
   protected static void setInvalid() {
-    if (JBoss6VFS.valid == Boolean.TRUE) {
+    if (JBoss6VFS.valid.booleanValue()) {
       log.debug("JBoss 6 VFS API is not available in this environment.");
       JBoss6VFS.valid = Boolean.FALSE;
     }

src/main/java/org/apache/ibatis/reflection/MetaClass.java

@@ -116,17 +116,18 @@ private Type getGenericGetterType(String propertyName) {
     try {
       Invoker invoker = reflector.getGetInvoker(propertyName);
       if (invoker instanceof MethodInvoker) {
-        Field _method = MethodInvoker.class.getDeclaredField("method");
-        _method.setAccessible(true);
-        Method method = (Method) _method.get(invoker);
+        Field declaredMethod = MethodInvoker.class.getDeclaredField("method");
+        declaredMethod.setAccessible(true);
+        Method method = (Method) declaredMethod.get(invoker);
         return TypeParameterResolver.resolveReturnType(method, reflector.getType());
       } else if (invoker instanceof GetFieldInvoker) {
-        Field _field = GetFieldInvoker.class.getDeclaredField("field");
-        _field.setAccessible(true);
-        Field field = (Field) _field.get(invoker);
+        Field declaredField = GetFieldInvoker.class.getDeclaredField("field");
+        declaredField.setAccessible(true);
+        Field field = (Field) declaredField.get(invoker);
         return TypeParameterResolver.resolveFieldType(field, reflector.getType());
       }
-    } catch (NoSuchFieldException | IllegalAccessException ignored) {
+    } catch (NoSuchFieldException | IllegalAccessException e) {
+      // Ignored
     }
     return null;
   }