Day: February 12, 2016

Categories
GWT Java Maven

HTMLUnit and GWT

After developing on an other aspect of a project, I realized later that all my GWT testcases didn’t work anymore. I got the following strange Exception:

?View Code PLAIN
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java.lang.NoSuchFieldError: FIREFOX_17
	at com.google.gwt.junit.RunStyleHtmlUnit.<clinit>(RunStyleHtmlUnit.java:200)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:264)
	at com.google.gwt.junit.JUnitShell.createRunStyle(JUnitShell.java:1181)
	at com.google.gwt.junit.JUnitShell.doStartup(JUnitShell.java:942)
	at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:982)
	at com.google.gwt.junit.JUnitShell.getUnitTestShell(JUnitShell.java:698)
	at com.google.gwt.junit.JUnitShell.runTest(JUnitShell.java:672)
	at com.google.gwt.junit.client.GWTTestCase.runTest(GWTTestCase.java:421)
	at junit.framework.TestCase.runBare(TestCase.java:141)
	at junit.framework.TestResult$1.protect(TestResult.java:122)
	at junit.framework.TestResult.runProtected(TestResult.java:142)
	at junit.framework.TestResult.run(TestResult.java:125)
	at junit.framework.TestCase.run(TestCase.java:129)
	at com.google.gwt.junit.client.GWTTestCase.run(GWTTestCase.java:247)
	at junit.framework.TestSuite.runTest(TestSuite.java:255)
	at junit.framework.TestSuite.run(TestSuite.java:250)
	at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:84)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
</clinit>

The exception also occurred via Maven and not only in IntelliJ, so I knew it has something to do with my Maven-Project.

After checking the dependencies of my project with mvn dependency:tree, I found a new transitive dependency of a new added dependency. Because I didn’t need the htmlunit-part of this component I excluded the htmlunit-dependency with the following directive in my pom.xml:

?View Code XML
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<dependencies>
....
    <dependency>
        <groupdid>my.dependency
        <artifactid>mydependency
        <exclusions>
            <exclusion>
                <groupid>net.sourceforge.htmlunit</groupid>
                <artifactid>htmlunit</artifactid>
            </exclusion>
        </exclusions>
    </artifactid></groupdid></dependency>
....
</dependencies>

A deeper analysis of the problem shows, that the transitive dependency was too new, because the field FIREFOX_17 is not available any more, but the newer one like FIREFOX_38.