Question

When running Selenium 2.21.0 build using the webdriver, I get the following error when running against Firefox 12.0 :

org.openqa.selenium.InvalidElementStateException: Cannot perform native interaction: Could not load native events component.
Command duration or timeout: 20.08 seconds
Build info: version: '2.2.1', revision: '16551', time: '2012-04-11 21:42:35'
System info: os.name: 'Windows 7', os.arch: 'x86', os.version: '6.1', java.version: '1.6.0_26'
Driver info: driver.version: RemoteWebDriver
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:175)
    at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:128)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:459)
    at org.openqa.selenium.remote.ExecuteMethod.execute(ExecuteMethod.java:47)
    at org.openqa.selenium.remote.RemoteMouse.mouseMove(RemoteMouse.java:89)
    at org.openqa.selenium.interactions.internal.MouseAction.moveToLocation(MouseAction.java:31)
    at org.openqa.selenium.interactions.ClickAndHoldAction.perform(ClickAndHoldAction.java:39)
    at org.openqa.selenium.interactions.CompositeAction.perform(CompositeAction.java:32)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoCachedMethodSiteNoUnwrapNoCoerce.invoke(PojoMetaMethodSite.java:229)
    at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:52)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:40)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:121)
    at isishelper.ActionHelper.placement_placeSampleOnContainer(ActionHelper.groovy:195)
...

My code in this case is as follows :

List sourceSamples = sourceTable.findElements((By.className("x-grid-row")))
List poolTargets = driver.findElements(By.className("pool-box"))
target = poolTargets[0]    
def source = sourceSamples[0]
// Then drag and drop the sample to target
(new Actions(driver)).dragAndDrop(source, target).perform()

I’m assuming this is missing functionality as Selenium 2.21 was released before Firefox 12.0, rather than an error setting up the driver on my part?

Checking the driver properties :

driver.getCapabilities().asMap().each { 
             index, value -> println("$index : $value") 
}

browserName : firefox
nativeEvents : false
takesScreenshot : true
version : 12.0

But while creating the driver with a profile I get nativeEvents = true :

profile.setEnableNativeEvents(true); 
println profile.getProperties()
driver = new FirefoxDriver(profile)

[enableNativeEvents:true, 
class:class org.openqa.selenium.firefox.FirefoxProfile,
additionalPreferences:org.openqa.selenium.firefox.Preferences@82d37]

Answer 1

Selenium 2.29.0 is released with the support for FF18 (for native events).
Here is the link to update : http://selenium.googlecode.com/git/rb/CHANGES.

May be updating to FF18 and selenium-webdriver (2.29.0) may help you.