diff --git a/weixin-graal/src/main/java/cn/binarywang/wx/graal/GraalProcessor.java b/weixin-graal/src/main/java/cn/binarywang/wx/graal/GraalProcessor.java
index 2cf569187..4eaddadf2 100644
--- a/weixin-graal/src/main/java/cn/binarywang/wx/graal/GraalProcessor.java
+++ b/weixin-graal/src/main/java/cn/binarywang/wx/graal/GraalProcessor.java
@@ -1,6 +1,7 @@
 package cn.binarywang.wx.graal;
 
 import lombok.Data;
+import lombok.extern.slf4j.Slf4j;
 
 import javax.annotation.processing.AbstractProcessor;
 import javax.annotation.processing.RoundEnvironment;
@@ -25,7 +26,6 @@ import java.util.TreeSet;
  *
  * @author outersky
  */
-
 @SupportedAnnotationTypes("lombok.Data")
 @SupportedSourceVersion(SourceVersion.RELEASE_7)
 public class GraalProcessor extends AbstractProcessor {
@@ -38,7 +38,6 @@ public class GraalProcessor extends AbstractProcessor {
   @Override
   public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
     for (TypeElement annotatedClass : ElementFilter.typesIn(roundEnv.getElementsAnnotatedWith(Data.class))) {
-
       registerClass(annotatedClass.getQualifiedName().toString());
       handleSuperClass(annotatedClass);
     }
@@ -108,29 +107,29 @@ public class GraalProcessor extends AbstractProcessor {
     String propsFile = path + NATIVE_IMAGE_PROPERTIES;
     try {
       FileObject fileObject = processingEnv.getFiler().createResource(StandardLocation.CLASS_OUTPUT, "", propsFile);
-      Writer writer = fileObject.openWriter();
-      writer.append("Args = -H:ReflectionConfigurationResources=${.}/" + REFLECTION_CONFIG_JSON);
-      writer.close();
+      try (Writer writer = fileObject.openWriter();) {
+        writer.append("Args = -H:ReflectionConfigurationResources=${.}/" + REFLECTION_CONFIG_JSON);
+      }
     } catch (IOException e) {
       e.printStackTrace();
     }
 
     try {
       FileObject fileObject = processingEnv.getFiler().createResource(StandardLocation.CLASS_OUTPUT, "", reflectFile);
-      Writer writer = fileObject.openWriter();
-      writer.write("[\n");
-      boolean first = true;
-      for (String name : classSet) {
-        if (first) {
-          first = false;
-        } else {
-          writer.write(",");
+      try (Writer writer = fileObject.openWriter();) {
+        writer.write("[\n");
+        boolean first = true;
+        for (String name : classSet) {
+          if (first) {
+            first = false;
+          } else {
+            writer.write(",");
+          }
+          writer.write(assetGraalJsonElement(name));
+          writer.append('\n');
         }
-        writer.write(assetGraalJsonElement(name));
-        writer.append('\n');
+        writer.write("]");
       }
-      writer.write("]");
-      writer.close();
     } catch (IOException e) {
       e.printStackTrace();
     }
diff --git a/weixin-java-common/src/main/java/me/chanjar/weixin/common/session/StandardSessionManager.java b/weixin-java-common/src/main/java/me/chanjar/weixin/common/session/StandardSessionManager.java
index 2472cb44b..591b7025d 100644
--- a/weixin-java-common/src/main/java/me/chanjar/weixin/common/session/StandardSessionManager.java
+++ b/weixin-java-common/src/main/java/me/chanjar/weixin/common/session/StandardSessionManager.java
@@ -1,21 +1,19 @@
 package me.chanjar.weixin.common.session;
 
+import me.chanjar.weixin.common.util.res.StringManager;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.atomic.AtomicBoolean;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import me.chanjar.weixin.common.util.res.StringManager;
-
 /**
  * 基于内存的session manager.
  *
  * @author Daniel Qian
  */
 public class StandardSessionManager implements WxSessionManager, InternalSessionManager {
-
   protected static final StringManager SM = StringManager.getManager(Constants.PACKAGE);
   /**
    * The descriptive name of this Manager implementation (for logging).
@@ -51,7 +49,9 @@ public class StandardSessionManager implements WxSessionManager, InternalSession
    */
   protected int maxInactiveInterval = 30 * 60;
 
-  // Number of sessions created by this manager
+  /**
+   * Number of sessions created by this manager
+   */
   protected long sessionCounter = 0;
 
   protected volatile int maxActive = 0;
@@ -154,12 +154,10 @@ public class StandardSessionManager implements WxSessionManager, InternalSession
     session.setValid(true);
     session.setCreationTime(System.currentTimeMillis());
     session.setMaxInactiveInterval(this.maxInactiveInterval);
-    String id = sessionId;
-    session.setId(id);
+    session.setId(sessionId);
     this.sessionCounter++;
 
-    return (session);
-
+    return session;
   }
 
 
@@ -181,10 +179,8 @@ public class StandardSessionManager implements WxSessionManager, InternalSession
     return new StandardSession(this);
   }
 
-
   @Override
   public void add(InternalSession session) {
-
     // 当第一次有session创建的时候，开启session清理线程
     if (!this.backgroundProcessStarted.getAndSet(true)) {
       Thread t = new Thread(new Runnable() {