Error: Could not get the Java version. Is Java installed?

Question

我运行 Appium 服务器：

➜  ~  appium    
info: Welcome to Appium v1.3.5 (REV a124a15677e26b33db16e81c4b3b34d9c6b8cac9)
info: Appium REST http interface listener started on 0.0.0.0:4723
info: Console LogLevel: debug
info: --> POST /wd/hub/session {"desiredCapabilities":{"appPackage":"com.grindrapp.android","appActivity":".activity.SplashActivity","platformVersion":"4.4.2","browserName":"","platformName":"Android","deviceName":"10.0.0.9:5555"}}
info: Client User-Agent string: Apache-HttpClient/4.3.4 (java 1.5)
info: [debug] Didn't get app but did get Android package, will attempt to launch it on the device
info: [debug] Creating new appium session 090abe0c-36d9-4f9b-987a-f3b665045928
info: Starting android appium
info: [debug] Getting Java version
info: [debug] Cleaning up android objects
info: [debug] Cleaning up appium session
error: Failed to start an Appium session, err was: Error: Could not get the Java version. Is Java installed?
info: [debug] Error: Could not get the Java version. Is Java installed?
    at /usr/local/lib/node_modules/appium/lib/devices/android/android-common.js:1040:17
    at ChildProcess.exithandler (child_process.js:735:7)
    at ChildProcess.emit (events.js:110:17)
    at maybeClose (child_process.js:1008:16)
    at Socket.<anonymous> (child_process.js:1176:11)
    at Socket.emit (events.js:107:17)
    at Pipe.close (net.js:476:12)
info: [debug] Responding to client with error: {"status":33,"value":{"message":"A new session could not be created. (Original error: Could not get the Java version. Is Java installed?)","origValue":"Could not get the Java version. Is Java installed?"},"sessionId":null}
info: <-- POST /wd/hub/session 500 316.738 ms - 222 


^C
➜  ~  echo $JAVA_HOME 
/Library/Java/JavaVirtualMachines/jdk1.7.0_76.jdk/Contents/Home

我尝试运行将此代码post发送到Appium服务器：

public class AndroidTest {

    private AppiumDriver driver;

    @Before
    public void setUp() throws Exception {
//        File classpathRoot = new File(System.getProperty("user.dir"));
//        File appDir = new File(classpathRoot, "../../../data/app/");
//        File app = new File(appDir, "Facebook.apk");
        DesiredCapabilities capabilities = new DesiredCapabilities();
        capabilities.setCapability(CapabilityType.BROWSER_NAME, "");
        capabilities.setCapability("deviceName","10.0.0.9:5555");
        capabilities.setCapability("platformVersion", "4.4.2");
        capabilities.setCapability("platformName","Android");
        //capabilities.setCapability("app", app.getCanonicalPath());

        capabilities.setCapability("appPackage", "com.grindrapp.android");
        capabilities.setCapability("appActivity", ".activity.SplashActivity");
        driver = new AndroidDriver(new URL("http://127.0.0.1:4723/wd/hub"), capabilities);
    }

但是如您所见，我得到了这个错误：

info: [debug] Error: Could not get the Java version. Is Java installed?

我该如何解决这个问题？

我正在尝试自动打开我从 google play 下载的应用程序，但我没有它的 apk。

Answer 1

文件位于此处：

/usr/local/lib/node_modules/appium/lib/devices/android/android-common.js

我们关注的从第1029行开始的代码是：

androidCommon.getJavaVersion = function (cb) {
    exec("java -version", function (err, stdout, stderr) {
      var javaVersion = null;
      if (err) {
        return cb(new Error("'java -version' failed. " + err));
      } else if (stderr) {
        var firstLine = stderr.split("\n")[0];
        if (new RegExp("java version").test(firstLine)) {
          javaVersion = firstLine.split(" ")[2].replace(/"/g, '');
        }
      }
      if (javaVersion === null) {
        return cb(new Error("Could not get the Java version. Is Java installed?"));
      }
      return cb(null, javaVersion);
    });
};

我无法在我的系统上对此进行测试，但我认为 java -version 的成功执行会 return 它在 stdout 而不是 stderr 上的响应。我会更改代码以提供有关正在发生的事情的更多信息并帮助调试它。

您在清单的末尾收到 JavaVersion = null 消息，这意味着错误中没有任何内容 return 并且 stderr 的解析未设置 JavaVersion。它不会告诉您 stderr 中是否有任何内容，甚至不会查看 stdout。

这是修改后的代码清单。如果输出确实在 stderr 上被 returned，代码现在至少会打印出来，这样你就可以看到什么是 returned。我为 stdout 添加了相同的代码分支，因为它根本没有被检查过。

androidCommon.getJavaVersion = function (cb) {
exec("java -version", function (err, stdout, stderr) {
    var javaVersion = null;
    var firstLine = null;

    if (err) {
      return cb(new Error("'java -version' failed. " + err));
    } else if (stderr) {
        firstLine = stderr.split("\n")[0];

        if (new RegExp("java version").test(firstLine)) {
          javaVersion = firstLine.split(" ")[2].replace(/"/g, '');
        }else{
          return cb(new Error("Java version stderr string parse error: " + stderr));
        }
    } else if(stdout){
            firstLine = stdout.split("\n")[0];

        if (new RegExp("java version").test(firstLine)) {
          javaVersion = firstLine.split(" ")[2].replace(/"/g, '');
        }else{
          return cb(new Error("Java version stdout string parse error: " + stdout));
        }       
    }   

    if (javaVersion === null) {
      return cb(new Error("Could not get the Java version. Is Java installed?"));
    }
      return cb(null, javaVersion);
});
}

所以：

备份 android-commons.js
更改代码并尝试一下。

这可能会像写的那样工作，或者错误消息会告诉您正在编辑什么。return。

Answer 2

我认为这是您问题的最终解决方案。

一如既往，在编辑前备份文件。

编辑文件/usr/local/lib/node_modules/appium/lib/devices/android/android-common.js

else if(stderr) 分支围绕 1034 行：

else if (stderr) {
        var firstLine = stderr.split("\n")[0];
        if (new RegExp("java version").test(firstLine)) {
          javaVersion = firstLine.split(" ")[2].replace(/"/g, '');
        }
      }

替换代码阅读：

else if (stderr){
    if(new RegExp("java version").test(stderr)){
      var regex = "java version \"[0-9]+\.[0-9]+\.[0-9]+";
      var stderrstring = '' + stderr + '';
      var regmatch = stderrstring.match(regex);
      javaVersion = '' + regmatch + ''   //convert object to string
      javaVersion.replace(/"/g,'');
    }
}

该代码应与常规 java 版本响应消息以及您收到的消息一起使用。

Answer 3

android-common.js中的代码在第一行寻找java版本号。我有类似的问题，但我的 java -version returns 结果为

[~]$ java -version
Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF8
java version "1.7.0_76"
Java(TM) SE Runtime Environment (build 1.7.0_76-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.76-b04, mixed mode)

所以我只是将 android-common.js 中的代码更改为拆分第二行而不是第一行

firstLine = stderr.split("\n")[0]; -> firstLine = stderr.split("\n")[1]

Error: Could not get the Java version. Is Java installed?

Error: Could not get the Java version. Is Java installed?

testing

android

ui-automation

appium