Github user mateiz commented on the pull request:

    https://github.com/apache/spark/pull/1929#issuecomment-53361512
  
    Actually, one follow-up: It seems that the patch *works* if you try to use 
the new class before calling `:cp` and fail to find it, but fails if you just 
call `:cp` first and then try to use the class. Here's a session that worked 
for me:
    ```
    scala> import test.Test
    <console>:10: error: not found: value test
           import test.Test
                  ^
    
    scala> :cp /Users/matei/workspace/jar-test/simple-jar-v1.jar
    Added '/Users/matei/workspace/jar-test/simple-jar-v1.jar'.  Your new 
classpath is:
    
"/Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home/jre/lib/JObjC.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Ho
 
me/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/System/Library/Java/Extensions/MRJToolkit.jar:/System/Library/Java/Extensions/QTJava.zip:/Users/matei/workspace/apache-spark/conf:/Users/matei/workspace/apache-spark/assembly/target/scala-2.10/spark-assembly-1.1.0-SNAPSHOT-hadoop1.0.4.jar:/Users/matei/workspace/jar-test/simple-jar-v1.jar"
    
    scala> import test.Test
    import test.Test
    
    scala> new Test
    res0: test.Test = Test2
    ```


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