diff --git a/pom.xml b/pom.xml
index 439ad288..f57454e7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,13 +6,19 @@
 
     <groupId>com.ceshiren.appcrawler</groupId>
     <artifactId>appcrawler</artifactId>
-    <version>2.7.2</version>
+    <version>2.7.3</version>
     <name>appcrawler</name>
-    <description>app crawler for automation testing, 全平台遍历测试工具，霍格沃兹测试开发学社出品，交流论坛 https://ceshiren.com/c/opensource/appcrawler</description>
+    <description>
+        -------------------------------------------------
+        appcrawler v2.7.3 全平台自动遍历测试工具
+        Q&amp;A: https://ceshiren.com/c/opensource/appcrawler
+        author: 思寒 seveniruby@霍格沃兹测试开发学社
+        -------------------------------------------------
+    </description>
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <java.version>1.8</java.version>
+        <java.version>8</java.version>
         <junit.platform.version>1.3.1</junit.platform.version>
         <aspectj.version>1.9.2</aspectj.version>
         <allure.version>2.15.1</allure.version>
@@ -390,8 +396,8 @@
                     <artifactId>maven-compiler-plugin</artifactId>
                     <version>3.8.1</version>
                     <configuration>
-                        <source>1.8</source>
-                        <target>1.8</target>
+                        <source>${java.version}</source>
+                        <target>${java.version}</target>
                     </configuration>
                 </plugin>
             </plugins>
diff --git a/src/main/scala/com/ceshiren/appcrawler/Banner.scala b/src/main/scala/com/ceshiren/appcrawler/Banner.scala
index 89129877..1ffc6d6e 100644
--- a/src/main/scala/com/ceshiren/appcrawler/Banner.scala
+++ b/src/main/scala/com/ceshiren/appcrawler/Banner.scala
@@ -4,7 +4,7 @@ object Banner {
   val banner =
     """
       |-------------------------------------------------
-      |appcrawler v2.7.2 全平台自动遍历测试工具
+      |appcrawler v2.7.3 全平台自动遍历测试工具
       |Q&A: https://ceshiren.com/c/opensource/appcrawler
       |author: 思寒 seveniruby@霍格沃兹测试开发学社
       |-------------------------------------------------
diff --git a/src/main/scala/com/ceshiren/appcrawler/core/Crawler.scala b/src/main/scala/com/ceshiren/appcrawler/core/Crawler.scala
index 4b4eeaa9..f12ebd0b 100644
--- a/src/main/scala/com/ceshiren/appcrawler/core/Crawler.scala
+++ b/src/main/scala/com/ceshiren/appcrawler/core/Crawler.scala
@@ -307,18 +307,16 @@ class Crawler {
     //todo: 主要做遍历测试和异常测试. 所以暂不使用selendroid
     log.info(automationName)
     val driver=automationName match {
-      case "selenium" => {
+      case "selenium" =>
         new SeleniumDriver(conf.capability)
-      }
       //todo: 以后使用restful接口支持atx和macaca
       /*      case "macaca" => {
               log.info("use macaca")
               driver = new MacacaDriver(url, conf.capability)
             }*/
-      case "adb" => {
+      case "adb" =>
         log.info("user adb")
         new AdbDriver(conf.capability)
-      }
 
 
       //todo: 把androidDriver与seleniumdriver独立
@@ -335,25 +333,21 @@ class Crawler {
         }
       }*/
 
-      case "uiautomator2server" => {
+      case "uiautomator2server" =>
         log.info("use uiautomator2server")
         new UIAutomator2ServerDriver(conf.capability)
-      }
-      case appium if appium==null || appium.isEmpty || appium.toLowerCase.equals("appium") => {
-        log.info("use AppiumClient")
-        log.info(conf.capability)
-        //fixed: appium 6.0.0 has bug with okhttp
-        //System.setProperty("webdriver.http.factory", "apache")
-        new AppiumClient(conf.capability)
-      }
-      case className => {
+      case className if className.contains(".") =>
         log.info(s"use ${className}")
         val clazz=Class.forName(className)
         log.info(clazz)
         val instance=clazz.getConstructor(classOf[immutable.Map[String, Any]]).newInstance(conf.capability).asInstanceOf[ReactWebDriver]
         log.info(instance)
         instance
-      }
+      case _ =>
+        log.info("use AppiumClient")
+        //fixed: appium 6.0.0 has bug with okhttp
+        //System.setProperty("webdriver.http.factory", "apache")
+        new AppiumClient(conf.capability)
     }
     log.info(driver)
     driver
@@ -1074,7 +1068,8 @@ class Crawler {
       }
       case this.backAppAction => {
         log.info("backApp")
-        driver.launchApp()
+//        driver.launchApp()
+        driver.backApp()
       }
       case this.afterAllAction => {
         if (conf.afterAll != null) {
diff --git a/src/main/scala/com/ceshiren/appcrawler/core/CrawlerConf.scala b/src/main/scala/com/ceshiren/appcrawler/core/CrawlerConf.scala
index dac6eb68..d2092d68 100644
--- a/src/main/scala/com/ceshiren/appcrawler/core/CrawlerConf.scala
+++ b/src/main/scala/com/ceshiren/appcrawler/core/CrawlerConf.scala
@@ -219,7 +219,7 @@ class CrawlerConf {
 
   }
 
-  def toYaml: String = {
+  def toYaml(): String = {
     val mapper = new ObjectMapper(new YAMLFactory())
     mapper.registerModule(DefaultScalaModule)
     mapper.writerWithDefaultPrettyPrinter().writeValueAsString(this)
diff --git a/src/main/scala/com/ceshiren/appcrawler/driver/ReactWebDriver.scala b/src/main/scala/com/ceshiren/appcrawler/driver/ReactWebDriver.scala
index cc6f2de2..74e882b7 100644
--- a/src/main/scala/com/ceshiren/appcrawler/driver/ReactWebDriver.scala
+++ b/src/main/scala/com/ceshiren/appcrawler/driver/ReactWebDriver.scala
@@ -72,7 +72,7 @@ abstract class ReactWebDriver {
 
   def launchApp(): Unit
 
-  def getPageSource: String
+  def getPageSource(): String
 
 
   //todo: 有的时候会出现极少内容的page source