diff --git a/README.md b/README.md
index 910bdf6..d2bd3b9 100644
--- a/README.md
+++ b/README.md
@@ -323,6 +323,10 @@ We decided to use Kotlin to develop the Java Wechaty!
 - [Java Wechaty](https://github.com/wechaty/java-wechaty) - Java WeChaty Conversational AI Chatbot SDK for Wechat Individual Accounts (Java)
 - [Scala Wechaty](https://github.com/wechaty/scala-wechaty) - Scala WeChaty Conversational AI Chatbot SDK for WechatyIndividual Accounts (Scala)
 
+## Stargazers over time
+
+[![Stargazers over time](https://starchart.cc/wechaty/java-wechaty.svg)](https://starchart.cc/wechaty/java-wechaty)
+
 ## Badge
 
 [![Wechaty in Kotlin](https://img.shields.io/badge/Wechaty-Kotlin-orange)](https://github.com/wechaty/java-wechaty)
diff --git a/pom.xml b/pom.xml
index 59edf86..05f8401 100644
--- a/pom.xml
+++ b/pom.xml
@@ -180,6 +180,25 @@
 
     <build>
         <plugins>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>build-helper-maven-plugin</artifactId>
+                <version>3.0.0</version>
+
+                <executions>
+                    <execution>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>add-source</goal>
+                        </goals>
+                        <configuration>
+                            <sources>
+                                <source>src/main/kotlin</source>
+                            </sources>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
 <!--            <plugin>-->
 <!--                <groupId>org.apache.maven.plugins</groupId>-->
 <!--                <artifactId>maven-gpg-plugin</artifactId>-->
diff --git a/wechaty-puppet/src/main/kotlin/io/github/wechaty/filebox/FileBox.kt b/wechaty-puppet/src/main/kotlin/io/github/wechaty/filebox/FileBox.kt
index 31f9857..904e8ef 100644
--- a/wechaty-puppet/src/main/kotlin/io/github/wechaty/filebox/FileBox.kt
+++ b/wechaty-puppet/src/main/kotlin/io/github/wechaty/filebox/FileBox.kt
@@ -138,13 +138,13 @@ class FileBox(options: FileBoxOptions) {
     }
 
     fun toJsonString(): String {
-        buffer = toByte(this)
+        buffer = getBufferByte(this)
 
         return JsonUtils.write(this)
 
     }
 
-    fun toByte(fileBox: FileBox): ByteArray? {
+    private fun getBufferByte(fileBox: FileBox): ByteArray? {
         when (fileBox.type()) {
             FileBoxType.File -> {
 
@@ -153,11 +153,12 @@ class FileBox(options: FileBoxOptions) {
                 return FileUtils.readFileToByteArray(file)
 
             }
-
             FileBoxType.Url -> {
                 return null;
             }
-
+            FileBoxType.Base64 -> {
+                return null;
+            }
             else -> {
                 TODO()
             }