diff --git a/src/main/java/org/redkale/convert/json/JsonBytesWriter.java b/src/main/java/org/redkale/convert/json/JsonBytesWriter.java
index 7856f4815..7090f9712 100644
--- a/src/main/java/org/redkale/convert/json/JsonBytesWriter.java
+++ b/src/main/java/org/redkale/convert/json/JsonBytesWriter.java
@@ -43,7 +43,7 @@ public class JsonBytesWriter extends JsonWriter implements ByteTuple {
     private byte[] content;
 
     public JsonBytesWriter() {
-        this(defaultSize);
+        this(DEFAULT_SIZE);
     }
 
     public JsonBytesWriter(int size) {
@@ -76,8 +76,8 @@ public class JsonBytesWriter extends JsonWriter implements ByteTuple {
     public boolean recycle() {
         super.recycle();
         this.count = 0;
-        if (this.content != null && this.content.length > defaultSize * 100) {
-            this.content = new byte[defaultSize];
+        if (this.content != null && this.content.length > DEFAULT_SIZE * 100) {
+            this.content = new byte[DEFAULT_SIZE];
         }
         return true;
     }
diff --git a/src/main/java/org/redkale/convert/json/JsonWriter.java b/src/main/java/org/redkale/convert/json/JsonWriter.java
index d3f899673..82afdffdc 100644
--- a/src/main/java/org/redkale/convert/json/JsonWriter.java
+++ b/src/main/java/org/redkale/convert/json/JsonWriter.java
@@ -19,7 +19,7 @@ import org.redkale.convert.*;
  */
 public abstract class JsonWriter extends Writer {
 
-    protected static final int defaultSize = Integer.getInteger("redkale.convert.json.writer.buffer.defsize", Integer.getInteger("redkale.convert.writer.buffer.defsize", 1024));
+    protected static final int DEFAULT_SIZE = Integer.getInteger("redkale.convert.json.writer.buffer.defsize", Integer.getInteger("redkale.convert.writer.buffer.defsize", 1024));
 
     protected JsonWriter() {
         this.features = JsonFactory.root().getFeatures();
diff --git a/src/main/java/org/redkale/source/FilterKey.java b/src/main/java/org/redkale/source/FilterKey.java
index 37ed81ba7..a2190325e 100644
--- a/src/main/java/org/redkale/source/FilterKey.java
+++ b/src/main/java/org/redkale/source/FilterKey.java
@@ -7,6 +7,7 @@ package org.redkale.source;
 
 import java.util.Objects;
 import org.redkale.annotation.ConstructorParameters;
+import org.redkale.convert.ConvertColumn;
 
 /**
  * FilterKey主要用于自身字段间的表达式, 如： a.recordid = a.parentid , a.parentid就需要FilterKey来表示 new FilterKey("parentid")
@@ -20,6 +21,7 @@ import org.redkale.annotation.ConstructorParameters;
  */
 public class FilterKey implements java.io.Serializable {
 
+    @ConvertColumn(index = 1)
     private final String column;
 
     @ConstructorParameters({"column"})
diff --git a/src/main/java/org/redkale/util/Copier.java b/src/main/java/org/redkale/util/Copier.java
index 0a849bdcf..3c8175cd4 100644
--- a/src/main/java/org/redkale/util/Copier.java
+++ b/src/main/java/org/redkale/util/Copier.java
@@ -697,6 +697,7 @@ public interface Copier<S, D> extends BiFunction<S, D, D> {
             Class clz = RedkaleClassLoader.findDynClass(newDynName.replace('/', '.'));
             return (Copier) (clz == null ? loader.loadClass(newDynName.replace('/', '.')) : clz).getDeclaredConstructor().newInstance();
         } catch (Throwable ex) {
+            //do nothing
         }
 
         // ------------------------------------------------------------------------------
diff --git a/src/main/java/org/redkale/util/Inners.java b/src/main/java/org/redkale/util/Inners.java
index 135af98c4..2476da37c 100644
--- a/src/main/java/org/redkale/util/Inners.java
+++ b/src/main/java/org/redkale/util/Inners.java
@@ -35,6 +35,9 @@ class Inners {
 
         static final IntFunction<String[]> stringFuncArray = x -> new String[x];
 
+        private CreatorInner() {
+        }
+
         static {
             creatorCacheMap.put(Object.class, p -> new Object());
             creatorCacheMap.put(ArrayList.class, p -> new ArrayList<>());
@@ -187,6 +190,7 @@ class Inners {
                             field = cz.getDeclaredField(names[i]);
                             break;
                         } catch (NoSuchFieldException nsfe) {
+                            //do nothing
                         }
                     }
                     if (field == null) {
@@ -225,6 +229,7 @@ class Inners {
                 Class clz = RedkaleClassLoader.findDynClass(newDynName.replace('/', '.'));
                 return (IntFunction) (clz == null ? loader.loadClass(newDynName.replace('/', '.')) : clz).getDeclaredConstructor().newInstance();
             } catch (Throwable ex) {
+                //do nothing
             }
 
             //-------------------------------------------------------------
@@ -289,6 +294,9 @@ class Inners {
 
         static final ConcurrentHashMap<Class, ConcurrentHashMap<Integer, ConcurrentHashMap<Class, ConcurrentHashMap<Class, Function>>>> copierFuncListTwoCaches = new ConcurrentHashMap();
 
+        private CopierInner() {
+        }
+
         public static void clearCopierCache() {
             copierOneCaches.clear();
             copierTwoCaches.clear();
@@ -303,5 +311,7 @@ class Inners {
 
         static final ConcurrentHashMap<Class, ConcurrentHashMap<Method, Invoker>> invokerCaches = new ConcurrentHashMap();
 
+        private InvokerInner() {
+        }
     }
 }
diff --git a/src/main/java/org/redkale/util/RedkaleClassLoader.java b/src/main/java/org/redkale/util/RedkaleClassLoader.java
index 2ec5e0a01..6004602e9 100644
--- a/src/main/java/org/redkale/util/RedkaleClassLoader.java
+++ b/src/main/java/org/redkale/util/RedkaleClassLoader.java
@@ -34,6 +34,7 @@ public class RedkaleClassLoader extends URLClassLoader {
         try {
             url = URI.create("file://redkale/uri").toURL(); //不能是jar结尾，否则会视为jar文件url
         } catch (MalformedURLException e) {
+            //do nothing
         }
         URL_NONE = url;
     }
@@ -42,16 +43,26 @@ public class RedkaleClassLoader extends URLClassLoader {
 
     private static final String[] buildPackages = {
         "org.redkaledyn", //所有动态生成类的根package
-        "org.redkale.annotation", "org.redkale.asm",
-        "org.redkale.boot", "org.redkale.boot.watch",
-        "org.redkale.cluster", "org.redkale.convert",
-        "org.redkale.convert.bson", "org.redkale.convert.ext",
-        "org.redkale.convert.json", "org.redkale.convert.protobuf",
-        "org.redkale.mq", "org.redkale.net",
-        "org.redkale.net.client", "org.redkale.net.http",
-        "org.redkale.net.sncp", "org.redkale.persistence",
-        "org.redkale.service", "org.redkale.source",
-        "org.redkale.util", "org.redkale.watch"
+        "org.redkale.annotation",
+        "org.redkale.asm",
+        "org.redkale.boot",
+        "org.redkale.boot.watch",
+        "org.redkale.cluster",
+        "org.redkale.convert",
+        "org.redkale.convert.bson",
+        "org.redkale.convert.ext",
+        "org.redkale.convert.json",
+        "org.redkale.convert.protobuf",
+        "org.redkale.mq",
+        "org.redkale.net",
+        "org.redkale.net.client",
+        "org.redkale.net.http",
+        "org.redkale.net.sncp",
+        "org.redkale.persistence",
+        "org.redkale.service",
+        "org.redkale.source",
+        "org.redkale.util",
+        "org.redkale.watch"
     };
 
     //redkale里所有使用动态字节码生成的类都需要存于此处
@@ -473,6 +484,7 @@ public class RedkaleClassLoader extends URLClassLoader {
                 try {
                     set.add(Paths.get(path.replace("&&", "://").replace("##", ":\\")).toRealPath().toFile().toURI().toURL());
                 } catch (Exception e) {
+                    //do nothing
                 }
             }
         }
@@ -497,6 +509,7 @@ public class RedkaleClassLoader extends URLClassLoader {
                         ucp = field.get(loader);
                         break;
                     } catch (Throwable e) {
+                        //do nothing
                     }
                 } while ((loaderClazz = loaderClazz.getSuperclass()) != Object.class);
                 if (ucp != null) { //URLClassPath
@@ -505,6 +518,7 @@ public class RedkaleClassLoader extends URLClassLoader {
                         Method method = ucp.getClass().getMethod("getURLs");
                         urls = (URL[]) method.invoke(ucp);
                     } catch (Exception e) {
+                        //do nothing
                     }
                     if (urls != null) {
                         for (URL url : urls) {
diff --git a/src/main/java/org/redkale/util/TypeToken.java b/src/main/java/org/redkale/util/TypeToken.java
index a710f5b5d..44bb19399 100644
--- a/src/main/java/org/redkale/util/TypeToken.java
+++ b/src/main/java/org/redkale/util/TypeToken.java
@@ -43,7 +43,7 @@ public abstract class TypeToken<T> {
      *
      * @return 是否可反解析
      */
-    public final static boolean isClassType(final Type type) {
+    public static final boolean isClassType(final Type type) {
         if (type instanceof Class) {
             return true;
         }
@@ -74,7 +74,7 @@ public abstract class TypeToken<T> {
         return true;
     }
 
-    public final static boolean containsUnknownType(final Type type) {
+    public static final boolean containsUnknownType(final Type type) {
         if (type == null) {
             return false;
         }
@@ -111,7 +111,7 @@ public abstract class TypeToken<T> {
         return true;
     }
 
-    public final static Class typeToClass(final Type type) {
+    public static final Class typeToClass(final Type type) {
         if (type instanceof Class) {
             return (Class) type;
         }
@@ -133,7 +133,7 @@ public abstract class TypeToken<T> {
         return typeToClass(raw != null ? raw : owner);
     }
 
-    public final static Class typeToClassOrElse(final Type type, final Class defClass) {
+    public static final Class typeToClassOrElse(final Type type, final Class defClass) {
         Class clazz = typeToClass(type);
         return clazz == null ? defClass : clazz;
     }
diff --git a/src/main/java/org/redkale/util/XmlReader.java b/src/main/java/org/redkale/util/XmlReader.java
index 1439d1e82..ed6c3c130 100644
--- a/src/main/java/org/redkale/util/XmlReader.java
+++ b/src/main/java/org/redkale/util/XmlReader.java
@@ -189,7 +189,9 @@ public class XmlReader {
                     throw newException("illegal character " + ch);
                 }
             } else if (ch >= 'a' && ch <= 'z') {
+                //do nothing
             } else if (ch >= 'A' && ch <= 'Z') {
+                //do nothing
             } else if (ch == '.' || ch == '-' || ch == '_' || ch == ':') {
                 if (first) {
                     throw newException("illegal character " + ch);