Android 9 can't get system bars

The problem

There is a problem in java-client-7.2.0 。The return type of HasAndroidDeviceDetails.getSystemBars,but actually is Map<String, Map<String,String>>。The response data is : {statusBar={visible=true, x=0, y=0, width=1080, height=89}, navigationBar={visible=true, x=0, y=0,width=1080, height=130}} 。Errors are reported as follows：
java.lang.ClassCastException: com.google.common.collect.Maps$TransformedEntriesMap cannot be cast to java.lang.String

Environment

• Appium version (or git revision) that exhibits the issue:7.2.0
• Last Appium version that did not exhibit the issue (if applicable):
• Desktop OS/version used to run Appium:windows 7
• Node.js version (unless using Appium.app|exe): 12.9.1
• Npm or Yarn package manager:npm
• Mobile platform/version under test: android 9
• Real device or emulator/simulator:Real device MI8
• Appium CLI or Appium.app|exe:

Code To Reproduce Issue [ Good To Have ]

	Map<String,String> bars= driver.getSystemBars();
	for(Entry<String, String> entry: bars.entrySet())
	{
		System.out.println("key:"+entry.getKey()+",value:"+entry.getValue());

            }

##error log
java.lang.ClassCastException: com.google.common.collect.Maps$TransformedEntriesMap cannot be cast to java.lang.String
at com.liu.jointt.test.HelloTest.testApi(HelloTest.java:432)
at com.liu.jointt.test.HelloTest.testAll(HelloTest.java:62)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:89)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:541)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209)

service log

[debug] [UiAutomator2] Getting session details from server to mix in
[debug] [WD Proxy] Matched '/' to command name 'getSession'
[debug] [WD Proxy] Proxying [GET /] to [GET http://localhost:8200/wd/hub/session
/b3d59c58-4570-426a-90c8-ec6742b53472] with body: {}
[debug] [WD Proxy] Got response with status 200: "{"sessionId":"b3d59c58-4570
-426a-90c8-ec6742b53472","status":0,"value":{}}"
[debug] [W3C (7f8e0ffa)] Responding to client with driver.getSession() result: {
"platform":"LINUX","webStorageEnabled":false,"takesScreenshot":true,"javascriptE
nabled":true,"databaseEnabled":false,"networkConnectionEnabled":true,"locationCo
ntextEnabled":false,"warnings":{},"desired":{"browserName":"","platformName":"an
droid","sessionOverride":true,"unicodekeyboard":"true","app":"E:\workspace_andr
iod\prototype\app\KPI.apk","deviceName":"dff48a9d","platformVersion":"9","res
etKeyboard":true},"browserName":"","platformName":"android","sessionOverride":tr
ue,"unicodekeyboard":"true","app":"E:\workspace_andriod\prototype\app\KPI.ap
k","deviceName":"dff48a9d","platformVersion":"9","resetKeyboard":true,"deviceUDI
D":"dff48a9d","appPackage":"com.jointt.myapp","deviceApiLevel":28,"deviceScreenS
ize":"1080x2248","deviceScreenDensity":440,"deviceModel":"MI 8","deviceManufactu
rer":"Xiaomi","pixelRatio":2.75,"statBarHeight":89,"viewportRect":{"left":0,"top
":89,"width":1080,"height":1940}}
[HTTP] <-- GET /wd/hub/session/7f8e0ffa-df5f-404b-a20d-c69fc5c2cc48 200 25 ms -
924
[HTTP]
[HTTP] --> GET /wd/hub/session/7f8e0ffa-df5f-404b-a20d-c69fc5c2cc48/appium/devic
e/system_bars
[HTTP] {}
[debug] [W3C (7f8e0ffa)] Calling AppiumDriver.getSystemBars() with args: ["7f8e0
ffa-df5f-404b-a20d-c69fc5c2cc48"]
[debug] [ADB] Running 'C:\Program Files\Andriod\android-sdk\platform-tools\adb.e
xe -P 5037 -s dff48a9d shell dumpsys window windows'
[debug] [W3C (7f8e0ffa)] Responding to client with driver.getSystemBars() result
: {"statusBar":{"visible":true,"x":0,"y":0,"width":1080,"height":89},"navigation
Bar":{"visible":true,"x":0,"y":0,"width":1080,"height":130}}
[HTTP] <-- GET /wd/hub/session/7f8e0ffa-df5f-404b-a20d-c69fc5c2cc48/appium/devic
e/system_bars 200 98 ms - 148
[HTTP]
[HTTP] --> DELETE /wd/hub/session/7f8e0ffa-df5f-404b-a20d-c69fc5c2cc48
[HTTP] {}
[debug] [W3C (7f8e0ffa)] Calling AppiumDriver.deleteSession() with args: ["7f8e0
ffa-df5f-404b-a20d-c69fc5c2cc48"]

Start at the HasAndroidDeviceDetails.getSystemBars() API and compare its declared return type with the nested response shown from /appium/device/system_bars. Reproduce the ClassCastException with driver.getSystemBars(), then inspect the related Java client tests or API definitions. Done means the returned system-bar data can be consumed without the reported cast failure.