dominikdorn.com » testing http://dominikdorn.com shit happens ;) Tue, 03 Jan 2012 19:47:31 +0000 en hourly 1 http://wordpress.org/?v=3.3 Maven + JUnit + ClassFormatError: Absent Code attribute in method that is not native or abstract in class file http://dominikdorn.com/2010/05/maven-junit-classformaterror-absent-code-attribute/ http://dominikdorn.com/2010/05/maven-junit-classformaterror-absent-code-attribute/#comments Tue, 11 May 2010 19:39:29 +0000 Dominik Dorn http://dominikdorn.com/?p=294 Once in a while one stumbles upon an error message like this

java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file javax/mail/Session

This happens if your code compiles against incomplete classes, like the JavaEE6 Api and your Unit tests try to access code thats not there. JUnit will simply fail and mark the test as error, printing something like this

Tests in error:
  initializationError(com.dominikdorn.dc.passwordReset.SimplePasswordResetServiceTest)

and the corresponding surefire text file starts like this:

-------------------------------------------------------------------------------
Test set: com.dominikdorn.dc.passwordReset.SimplePasswordResetServiceTest
-------------------------------------------------------------------------------
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.022 sec <<< FAILURE!
initializationError(com.dominikdorn.dc.passwordReset.SimplePasswordResetServiceTest)  Time elapsed: 0.005 sec  <<< ERROR!
java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file javax/mail/Session
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
....

The Solution
You have to compile against real-implementations of the classes. You do that by adding those dependencies before the most generic dependency in your pom.xml

As example, we add javax.mail BEFORE javaee6-api like this

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<project ...>
...
    <dependencies>
 
        <dependency>
            <groupId>javax.mail</groupId>
            <artifactId>mail</artifactId>
            <version>1.4</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>6.0</version>
            <scope>provided</scope>
        </dependency>
</project>

If you are deploying your App on an Appserver like Glassfish or JBoss AS, leave the scope of javax.mail:mail as provided to prevent the inclusion of the jar in the final webapp.

I now list required dependencies for various Absent Code Errors I've encountered and still encountering. This post will be updated every time I solve another of these problems.

JavaMail: javax/mail/Session

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<project ...>
...
    <dependencies>
        <dependency>
            <groupId>javax.mail</groupId>
            <artifactId>mail</artifactId>
            <version>1.4</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>
</project>

Servlet 3.0

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<project ...>
...
    <dependencies>
               <dependency>
                       <groupId>org.glassfish</groupId>
                       <artifactId>javax.servlet</artifactId>
                       <version>3.0</version>
                       <scope>provided</scope>
               </dependency>
...
    </dependencies>
....   
    <repositories>
               <!-- Required until the Servlet 3.0 API can be resolved in Central -->     
               <repository>
                       <id>Glassfish</id>
                       <name>Glassfish Maven2 Repository</name>
                       <url>http://download.java.net/maven/glassfish/</url>
               </repository>
    </repositories>
 </project>

JPA2: javax/persistence/PersistenceException

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<dependencies>...
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>javax.persistence</artifactId>
            <version>2.0.0</version>
            <scope>provided</scope>
        </dependency>
...</dependencies>
..
<repositories>
...
    <repositories>
...
        <repository>
            <id>eclipse</id>
            <name>Eclipse Maven Repository</name>
            <url>http://www.eclipse.org/downloads/download.php?r=1&amp;nf=1&amp;file=/rt/eclipselink/maven.repo</url>
        </repository>
    </repositories>

JAX-RS: javax/ws/rs/core/UriBuilder

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        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-core</artifactId>
            <version>1.1.5</version>
            <scope>provided</scope>
        </dependency>
<!-- for json support -->
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-json</artifactId>
            <version>1.1.5</version>
            <scope>provided</scope>
        </dependency>
<!-- for testing --> 
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-test-framework</artifactId>
            <version>1.1.5.1</version>
            <scope>test</scope>
        </dependency>

more to come soon!

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