ScalaTest - java.lang.IncompatibleClassChangeError: Implementing class

Question

I'm getting IncompatibleClassChangeError when run test as ScalaTest from eclipse, the flowing is the full stack trace of the errors. Can anyone give me some advise? Thanks in advance!

An exception or error caused a run to abort. This may have been caused by a problematic custom reporter.
    java.lang.IncompatibleClassChangeError: Implementing class
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$100(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$100(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at org.scalatest.tools.Runner$$anonfun$35.apply(Runner.scala:2438)
        at org.scalatest.tools.Runner$$anonfun$35.apply(Runner.scala:2436)
        at scala.collection.TraversableLike$$anonfun$filter$1.apply(TraversableLike.scala:264)
        at scala.collection.immutable.List.foreach(List.scala:318)
        at scala.collection.TraversableLike$class.filter(TraversableLike.scala:263)
        at scala.collection.AbstractTraversable.filter(Traversable.scala:105)
        at org.scalatest.tools.Runner$.doRunRunRunDaDoRunRun(Runner.scala:2436)
        at org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1044)
        at org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1043)
        at org.scalatest.tools.Runner$.withClassLoaderAndDispatchReporter(Runner.scala:2722)
        at org.scalatest.tools.Runner$.runOptionallyWithPassFailReporter(Runner.scala:1043)
        at org.scalatest.tools.Runner$.main(Runner.scala:860)
        at org.scalatest.tools.Runner.main(Runner.scala)
        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 scala.tools.eclipse.scalatest.launching.ScalaTestLauncher$.main(ScalaTestLauncher.scala:20)
        at scala.tools.eclipse.scalatest.launching.ScalaTestLauncher.main(ScalaTestLauncher.scala)

Jar dependency and maven plugins are like below:

<build>
    <pluginManagement>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-resources-plugin</artifactId>
                <version>2.6</version>
            </plugin>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>build-helper-maven-plugin</artifactId>
                <version>1.8</version>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-clean-plugin</artifactId>
                <version>2.5</version>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-deploy-plugin</artifactId>
                <version>2.7</version>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-install-plugin</artifactId>
                <version>2.4</version>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-project-info-reports-plugin</artifactId>
                <version>2.6</version>
            </plugin>
        </plugins>
    </pluginManagement>

    <plugins>
        <plugin>
            <groupId>net.alchim31.maven</groupId>
            <artifactId>scala-maven-plugin</artifactId>
            <version>3.2.0</version>
            <executions>
                <execution>
                    <goals>
                        <goal>compile</goal>
                        <goal>testCompile</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
            <configuration>
                <source>1.7</source>
                <target>1.7</target>
                <showWarnings>true</showWarnings>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <version>2.4</version>
        </plugin>
    </plugins>
</build>

<dependencies>
    <dependency>
        <groupId>org.scala-lang</groupId>
        <artifactId>scala-library</artifactId>
        <version>2.10.5</version>
    </dependency>
    <dependency>
        <groupId>org.scalatest</groupId>
        <artifactId>scalatest_2.10</artifactId>
        <version>2.2.4</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>
</dependencies>

Hi @kukido, Source code is just a simple assertion, nothing special. For the dependency, is anything wrong? — dereck, Oct 27 '15 at 07:57
I have the same error, appeared when I moved project from Scala 2.11.7 to 2.11.8. — postfuturist, May 16 '16 at 20:19
Possible duplicate of [java.lang.IncompatibleClassChangeError: Implementing class with ScalaCheck and ScalaTest](http://stackoverflow.com/questions/35312410/java-lang-incompatibleclasschangeerror-implementing-class-with-scalacheck-and-s) — postfuturist, May 16 '16 at 21:13

score 1 · Answer 1 · answered Mar 23 '17 at 13:54

1

I was having a similar problem. The issue was that the test class had the same name as the tested file, and was in the same package. If that's your case, a simple rename would be enough.

Hope it helps someone!

answered Mar 23 '17 at 13:54

Agus Arias

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ScalaTest - java.lang.IncompatibleClassChangeError: Implementing class

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