java.lang.NoSuchFieldError：运行Appium Android测试时发生INSTANCE异常

Question

I'm working with an Appium Android Test. 我正在使用Appium Android测试。 I didn't have any problems with my test and it was working well. 我的测试没有任何问题，并且运行良好。 After few weeks, I tried to run it again (without any changes) and now I get the following error: 几周后，我尝试再次运行它（没有任何更改），现在出现以下错误：

java.lang.ExceptionInInitializerError
at org.openqa.selenium.remote.internal.HttpClientFactory.getClientConnectionManager(HttpClientFactory.java:71)
at org.openqa.selenium.remote.internal.HttpClientFactory.<init>(HttpClientFactory.java:57)
at org.openqa.selenium.remote.internal.HttpClientFactory.<init>(HttpClientFactory.java:60)
at org.openqa.selenium.remote.internal.ApacheHttpClient$Factory.getDefaultHttpClientFactory(ApacheHttpClient.java:251)
at org.openqa.selenium.remote.internal.ApacheHttpClient$Factory.<init>(ApacheHttpClient.java:228)
at org.openqa.selenium.remote.HttpCommandExecutor.getDefaultClientFactory(HttpCommandExecutor.java:96)
at org.openqa.selenium.remote.HttpCommandExecutor.<init>(HttpCommandExecutor.java:70)
at io.appium.java_client.remote.AppiumCommandExecutor.<init>(AppiumCommandExecutor.java:36)
at io.appium.java_client.AppiumDriver.<init>(AppiumDriver.java:167)
at io.appium.java_client.android.AndroidDriver.<init>(AndroidDriver.java:69)
at QA.Test.setUp(Test.java:52)
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.RunBefores.evaluate(RunBefores.java:24)
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.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:119)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
Caused by: java.lang.RuntimeException: Stub!
at org.apache.http.conn.ssl.AbstractVerifier.<init>(AbstractVerifier.java:5)
at org.apache.http.conn.ssl.AllowAllHostnameVerifier.<init>(AllowAllHostnameVerifier.java:5)
at org.apache.http.conn.ssl.SSLConnectionSocketFactory.<clinit>(SSLConnectionSocketFactory.java:124)
... 39 more

Current POM.xml file dependencies: 当前的POM.xml文件依赖项：

    <dependency>
        <groupId>org.seleniumhq.selenium</groupId>
        <artifactId>selenium-server</artifactId>
        <version>2.48.2</version>
    </dependency>

    <dependency>
        <groupId>nu.pattern</groupId>
        <artifactId>opencv</artifactId>
        <version>2.4.9-7</version>
    </dependency>

    <dependency>
        <groupId>io.appium</groupId>
        <artifactId>java-client</artifactId>
        <version>2.1.0</version>
    </dependency>

Also here's setUp: 另外这里的设置：

DesiredCapabilities capabilities = new DesiredCapabilities();
capabilities.setCapability("appium-version", "1.4.13");
capabilities.setCapability("platformName", "Android");
capabilities.setCapability("deviceName", "Android Emulator");
capabilities.setCapability("platformVersion", "4.3");
capabilities.setCapability("appPackage", "<app_package>");
capabilities.setCapability("appActivity", "<app_activity>");
driver = new AndroidDriver(new URL("http://127.0.0.1:4723/wd/hub"), capabilities);

(I get the error in the last line while debugging) （调试时我在最后一行收到错误）

Once again: I didn't have this error and I didn't change anything. 再一次：我没有这个错误，也没有做任何改动。

Edit: I've upgraded 'java-client' and then I got the following exception: 编辑：我已经升级了'java-client'，然后出现以下异常：

java.lang.NoClassDefFoundError: org/hamcrest/SelfDescribing

And then I've added hamcrest-core jar file to my project. 然后，我将hamcrest-core jar文件添加到我的项目中。 Now I get the following exception: 现在，我得到以下异常：

java.lang.NoSuchFieldError: INSTANCE

at org.apache.http.conn.ssl.SSLConnectionSocketFactory.<clinit>(SSLConnectionSocketFactory.java:144)
at org.openqa.selenium.remote.internal.HttpClientFactory.getClientConnectionManager(HttpClientFactory.java:71)
at org.openqa.selenium.remote.internal.HttpClientFactory.<init>(HttpClientFactory.java:57)
at org.openqa.selenium.remote.internal.HttpClientFactory.<init>(HttpClientFactory.java:60)
at org.openqa.selenium.remote.internal.ApacheHttpClient$Factory.getDefaultHttpClientFactory(ApacheHttpClient.java:251)
at org.openqa.selenium.remote.internal.ApacheHttpClient$Factory.<init>(ApacheHttpClient.java:228)
at io.appium.java_client.remote.AppiumCommandExecutor.<init>(AppiumCommandExecutor.java:50)
at io.appium.java_client.AppiumDriver.<init>(AppiumDriver.java:77)
at io.appium.java_client.android.AndroidDriver.<init>(AndroidDriver.java:67)
at QA.Test.setUp(Test.java:55)
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.RunBefores.evaluate(RunBefores.java:24)
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.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:119)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

java.lang.NullPointerException
at QA.Test.tearDown(Test.java:200)
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.RunAfters.evaluate(RunAfters.java:33)
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.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:119)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

Thank you in advance 先感谢您

Answer 1

This is a dependency issue caused by http request, 这是由http请求引起的依赖性问题，

Two reasons, may be ur referring more than one http-jar in ur class path -remove and keep only one 有两个原因，可能是您在类路径中引用了多个 http- jar-删除并仅保留一个

or there is no http jar to perform http req- add http core jar something like, 或没有HTTP jar执行http请求-添加http core jar之类的东西，

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-core</artifactId>
    <version>3.6.3.Final</version>
</dependency>

Answer 2

I've upgraded java-client and then updated POM.xml I had still same issue but I added http-client and http-core to jar library. 我已经升级了java-client，然后又更新了POM.xml，我仍然遇到同样的问题，但是我在jar库中添加了http-client和http-core。 And it works now. 现在就可以了。 Thank you @karthick23 谢谢@ karthick23

java.lang.NoSuchFieldError：运行Appium Android测试时发生INSTANCE异常

问题描述

2 个解决方案

解决方案1
2 2016-04-04 11:22:36

解决方案2
1 2016-04-04 11:23:00

java.lang.NoSuchFieldError：运行Appium Android测试时发生INSTANCE异常

问题描述

2 个解决方案

解决方案1 2 2016-04-04 11:22:36

解决方案2 1 2016-04-04 11:23:00

解决方案1
2 2016-04-04 11:22:36

解决方案2
1 2016-04-04 11:23:00