java - Compound class names are not supported error in WebDriver

Question

I have a method to count the number of elements in divs and to return their number.

 public int getNumberOfOpenBets() {

     openBetsSlip = driver.findElement(By.id("form_open_bets"));
     openBets = openBetsSlip.findElements(By.className(" cashout_noCash"));
     return openBets.size();
 }

That's the page source

<form id="form_open_bets" method="post" name="form_open_bets">
    <input type="hidden" value="" name="action">
    <input type="hidden" value="" name="bet_id">
    <input type="hidden" value="" name="cashout_price">
    <input id="target_page" type="hidden" value="" name="target_page">
    <div id="By.id" class="slipWrapper ">
        <div id="openBets_header"></div>
        <div id="cashout_1626" class=" cashout_noCash">
            <div id="cashout_1625" class=" cashout_noCash">
                <div id="cashout_1615" class=" cashout_noCash">
                    <div id="cashout_1614" class=" cashout_noCash">
                        <div id="cashout_1613" class=" cashout_noCash">
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</form>

WebDriver is throwing the following error: Compound class names are not supported. Consider searching for one class name and filtering the results or use CSS selectors.

org.openqa.selenium.InvalidSelectorException: Compound class names are not supported. Consider searching for one class name and filtering the results or use CSS selectors.
For documentation on this error, please visit: http://seleniumhq.org/exceptions/invalid_selector_exception.html
Build info: version: '2.31.0', revision: '1bd294d185a80fa4206dfeab80ba773c04ac33c0', time: '2013-02-27 13:51:26'
System info: os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.7.0_17'
Driver info: driver.version: unknown
    at org.openqa.selenium.By.className(By.java:131)
    at elements.betslip.Betslip.getNumberOfOpenBets(Betslip.java:136)
    at testSomething(SomethingTest.java:117)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

EDIT:

As it turned out WerbDriver doesn't support spaces in the class names, omg.

Could you guys please help me to use CSS selector in this situation in order to find the elements?

Answer 1

This is exactly as expected. If your class name includes a space, WebDriver will see it as a "compound selector". You can either remove the space in your By.className() locator, which should still find the elements you're looking for; or you can move to finding by CSS selectors, using something like By.cssSelector(".cashout_noCash"), which offer far more flexibility for similar functionality. This is exactly what the exception message says.