An error occurred while running JavaScript in Selenium WebDriver

 static WebDriver driver = new  FirefoxDriver();
    public static void main(String[] args) throws IOException, InterruptedException {
        // TODO code application logic here
        BufferedReader br= new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Enter base url....!!!");
        String baseurl = br.readLine();
        connection c= new connection();
        c.makeConnection(driver,baseurl);
       JavascriptExecutor js;
      if (driver instanceof JavascriptExecutor) {
    js = (JavascriptExecutor)driver;
    js.executeScript("alert('hello world');");
  }

An error message is displayed as follows:

Exception in thread "main" org.openqa.selenium.UnhandledAlertException: Modal dialog present: hello world
Build info: version: '2.39.0', revision: 'ff23eac', time: '2013-12-16 16:11:15'
System info: host: 'comp74', ip: '192.168.0.74', os.name: 'Windows 7', os.arch: 'x86', os.version: '6.1', java.version: '1.7.0_17'
Session ID: f6ba3a2b-87d4-4192-ad1a-94cf260d8f6e
Driver info: org.openqa.selenium.firefox.FirefoxDriver
Capabilities [{platform=XP, acceptSslCerts=true, javascriptEnabled=true, cssSelectorsEnabled=true, databaseEnabled=true, browserName=firefox, handlesAlerts=true, browserConnectionEnabled=true, webStorageEnabled=true, nativeEvents=true, rotatable=false, locationContextEnabled=true, applicationCacheEnabled=true, takesScreenshot=true, version=26.0}]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:193)
    at org.openqa.selenium.remote.ErrorHandler.createUnhandledAlertException(ErrorHandler.java:174)
    at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:141)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:554)
    at org.openqa.selenium.remote.RemoteWebDriver.findElements(RemoteWebDriver.java:332)
    at org.openqa.selenium.remote.RemoteWebDriver.findElementsByXPath(RemoteWebDriver.java:408)
    at org.openqa.selenium.By$ByXPath.findElements(By.java:358)
    at org.openqa.selenium.remote.RemoteWebDriver.findElements(RemoteWebDriver.java:295)
    at javaapplication4.count.linkCount(count.java:27)
    at javaapplication4.JavaApplication4.main(JavaApplication4.java:34)
javajavascriptselenium

Answer №1

Based on my understanding, when an alert is executed and any other operation is attempted on the page where the alert already exists, this error occurs. Have you provided the actual code?

The exception is thrown at javaapplication4.count.linkCount(count.java:27)
at javaapplication4.JavaApplication4.main(JavaApplication4.java:34)

According to the above stack trace, something is being done in linkCount. If there is any code after 

.executeScript("alert('hello world'
line, please comment them out and then check.

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