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I was trying to run various web drivers (ChromeDriver and HtmlUnitDriver) in my maven Java project, but I encountered errors which I suspect to be maven dependency issues. I am seeing if anybody could help me spot the source of the error?

Below are the error messages:

(For ChromeDriver)

Exception in thread "main" java.lang.IllegalStateException: The path to the driver executable must be set by the webdriver.chrome.driver system property; for more information, see http://code.google.com/p/selenium/wiki/ChromeDriver. The latest version can be downloaded from http://chromedriver.storage.googleapis.com/index.html
at com.google.common.base.Preconditions.checkState(Preconditions.java:197)
at org.openqa.selenium.remote.service.DriverService.findExecutable(DriverService.java:105)
at org.openqa.selenium.chrome.ChromeDriverService.createDefaultService(ChromeDriverService.java:89)
at org.openqa.selenium.chrome.ChromeDriver.<init>(ChromeDriver.java:117)
...etc...

(For HTMLUnitDriver)

Exception in thread "main" java.lang.VerifyError: Cannot inherit from final class
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at com.gargoylesoftware.htmlunit.HttpWebConnection.createHttpClient(HttpWebConnection.java:542)
at com.gargoylesoftware.htmlunit.HttpWebConnection.getHttpClient(HttpWebConnection.java:506)
at com.gargoylesoftware.htmlunit.HttpWebConnection.getResponse(HttpWebConnection.java:150)
at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseFromWebConnection(WebClient.java:1281)
at com.gargoylesoftware.htmlunit.WebClient.loadWebResponse(WebClient.java:1198)
at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:307)
at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:376)
at org.openqa.selenium.htmlunit.HtmlUnitDriver.get(HtmlUnitDriver.java:474)
at org.openqa.selenium.htmlunit.HtmlUnitDriver.get(HtmlUnitDriver.java:463)
...etc...

I have examined my pom.xml file (relevant section as below) and I am still not sure where the problem lies.

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.ret</groupId>
<artifactId>inventory</artifactId>
<version>1.0</version>
<name>inventory</name>
<description>Core inventory modules to support plugins and batch reports.</description>
<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<repositories>
    <repository>
        <id>ret</id>
        <url>https://dev2.ret.com/snapshots</url>
    </repository>
    <repository>
        <id>sonatype</id>
        <url>http://oss.sonatype.org/content/repositories/releases/</url>
    </repository>
</repositories>
<distributionManagement>
    <snapshotRepository>
        <id>maven3-snapshot-repository</id>
        <name>Maven3 Snapshot Repository</name>
        <url>scp://dev.ret.com/snapshots/</url>
        <uniqueVersion>false</uniqueVersion>
    </snapshotRepository>
</distributionManagement>
<dependencies>
    <dependency>
        <groupId>com.ret</groupId>
        <artifactId>common</artifactId>
        <version>1.0.0-SNAPSHOT</version>
        <exclusions>
            <exclusion>  <!-- declare the exclusion here -->
                <groupId>javax.servlet</groupId>
                <artifactId>javax.servlet-api</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.seleniumhq.selenium</groupId>
        <artifactId>selenium-htmlunit-driver</artifactId>
        <version>2.37.1</version>
    </dependency>
    <dependency>
        <groupId>org.seleniumhq.selenium</groupId>
        <artifactId>selenium-chrome-driver</artifactId>
        <version>2.37.1</version>
    </dependency>
    <dependency>
        <groupId>com.ret</groupId>
        <artifactId>crawl</artifactId>
        <version>1.0.0</version>
    </dependency>
    <dependency>
        <groupId>com.ret</groupId>
        <artifactId>plugin</artifactId>
        <version>1.0.0-SNAPSHOT</version>
    </dependency>
    <dependency>
        <groupId>postgresql</groupId>
        <artifactId>postgresql</artifactId>
        <version>9.1-901.jdbc4</version>
        <type>jar</type>
        <optional>false</optional>
    </dependency>


</dependencies>
<build>
    <plugins>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>1.7</source>
                <target>1.7</target>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>2.2</version>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                    <configuration>
                        <artifactSet>
                            <excludes>
                                <exclude>junit:junit</exclude>
                                <exclude>org.apache.maven:lib:tests</exclude>
                                <exclude>crawl*:jar</exclude>
                            </excludes>
                        </artifactSet>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
    <extensions>
        <extension>
            <groupId>org.apache.maven.wagon</groupId>
            <artifactId>wagon-ssh</artifactId>
            <version>1.0</version>
        </extension>
    </extensions>
</build>

And here is the test class on which I am running the web drivers.

 import org.openqa.selenium.WebDriver;
 import org.openqa.selenium.chrome.ChromeDriver;
 import org.openqa.selenium.htmlunit.HtmlUnitDriver;

 public class TestClass {

     public static void main(String[] args){

         WebDriver driver = new HtmlUnitDriver();
         driver.get("http://www.google.com");

         System.setProperty("webdriver.chrome.driver",  "/Users/tank/Documents/workspace/chromedriver");
         WebDriver webDriver = new ChromeDriver();
         webDriver.get("http://www.google.com");

     }
}

Any form of help/feedback on the possible sources of errors will be appreciated :) Thank you!

  • It tells you the error, "Cannot inherit from final class." Are you trying to extend a class that has been declared as final somewhere in your program? – Zarwan Aug 31 '15 at 18:14
  • No. I am just trying to declare new instances of HtmlUnitDriver and ChromeDriver. What you see under 'TestClass' is all I have in my program. – ks-uppercut Aug 31 '15 at 18:20

2 Answers2

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  1. For ChromeDriver, you must install another executable as hinted here, the simplest way is to download it and add it to your PATH.
  2. For HtmlUnitDriver, you are mixing versions of selenium-htmlunit-driver, selenium-chrome-driver and selenium-java, all of them should be exact match, so you don't have conflicting dependencies. Also, you shouldn't explicitly add commons-httpclient, since it may conflict with an already defined dependency.

    I would just depend on selenium-chrome-driver and selenium-htmlunit-driver in your case, without anything else.
Ahmed Ashour
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  • Hi, I understand about the additional executable for Chrome driver. I have updated the code shown above. However, I removed all dependencies except for `selenium-chrome-driver` and `selenium-htmlunit-driver` and the same error messages still show? – ks-uppercut Aug 31 '15 at 22:12
  • With the same versions? If yes, please use latest version, and update your question with the full POM. – Ahmed Ashour Aug 31 '15 at 22:17
  • I have updated my question with the full pom. Something else which I also tried - I included just `selenium-java` version `2.45.0` and no other selenium related dependencies, and still getting the same error – ks-uppercut Aug 31 '15 at 22:50
  • I retested with a new project, and removed all `com.ret` dependencies, and the test works fine for both Chrome and HtmlUnit. – Ahmed Ashour Aug 31 '15 at 23:36
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Try to find where the problem really lays, debug the code without maven. and then proceed forward.