When using "new FirefoxDriver()" I am always getting a "NoSuchMethodError: org.apache.xpath.XPathContext"

Question

When using new FirefoxDriver() I am always getting a

NoSuchMethodError: org.apache.xpath.XPathContext

(Exception in thread "main" java.lang.NoSuchMethodError: org.apache.xpath.XPathContext.(Z)V at org.apache.xpath.jaxp.XPathExpressionImpl.eval(XPathExpressionImpl.java:115) at org.apache.xpath.jaxp.XPathExpressionImpl.eval(XPathExpressionImpl.java:99) at org.apache.xpath.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.java:184) at org.openqa.selenium.firefox.internal.FileExtension.readIdFromInstallRdf(FileExtension.java:120) at org.openqa.selenium.firefox.internal.FileExtension.writeTo(FileExtension.java:60) at org.openqa.selenium.firefox.internal.ClasspathExtension.writeTo(ClasspathExtension.java:63) at org.openqa.selenium.firefox.FirefoxProfile.installExtensions(FirefoxProfile.java:464) at org.openqa.selenium.firefox.FirefoxProfile.layoutOnDisk(FirefoxProfile.java:442) at org.openqa.selenium.firefox.internal.NewProfileExtensionConnection.start(NewProfileExtensionConnection.java:79) at org.openqa.selenium.firefox.FirefoxDriver.startClient(FirefoxDriver.java:250) at org.openqa.selenium.remote.RemoteWebDriver.(RemoteWebDriver.java:110) at org.openqa.selenium.firefox.FirefoxDriver.(FirefoxDriver.java:195) at org.openqa.selenium.firefox.FirefoxDriver.(FirefoxDriver.java:190) at org.openqa.selenium.firefox.FirefoxDriver.(FirefoxDriver.java:107) at test.PerfTest.main(PerfTest.java:35) )

Answer 1

It is probably xalan.jar causing this. Check if you have different versions of xalan in your classpath and try checking if webdriver is referencing the correct jar. You can try

System.out.println(new XPathContext().getClass().getProtectionDomain().getCodeSource().getLocation());

to check which jar it is using.