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https://issues.apache.org/jira/browse/SPARK-1520?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Wendell updated SPARK-1520:
-----------------------------------
Component/s: MLlib
> Spark assembly fails with JRE6 for unknown reason
> -------------------------------------------------
>
> Key: SPARK-1520
> URL: https://issues.apache.org/jira/browse/SPARK-1520
> Project: Spark
> Issue Type: Bug
> Components: MLlib
> Reporter: Patrick Wendell
> Priority: Blocker
> Fix For: 1.0.0
>
>
> This is a real doozie - when compiling a Spark assembly with JDK7, the
> produced jar does not work well with JRE6. I confirmed the byte code being
> produced is JDK 6 compatible (major version 50). What happens is that,
> silently, the JRE will not load any class files from the assembled jar.
> {code}
> $> sbt/sbt assembly/assembly
> $> /usr/lib/jvm/java-1.7.0-openjdk-amd64/bin/java -cp
> /home/patrick/Documents/spark/assembly/target/scala-2.10/spark-assembly-1.0.0-SNAPSHOT-hadoop1.0.4.jar
> org.apache.spark.ui.UIWorkloadGenerator
> usage: ./bin/spark-class org.apache.spark.ui.UIWorkloadGenerator [master]
> [FIFO|FAIR]
> $> /usr/lib/jvm/java-1.6.0-openjdk-amd64/bin/java -cp
> /home/patrick/Documents/spark/assembly/target/scala-2.10/spark-assembly-1.0.0-SNAPSHOT-hadoop1.0.4.jar
> org.apache.spark.ui.UIWorkloadGenerator
> Exception in thread "main" java.lang.NoClassDefFoundError:
> org/apache/spark/ui/UIWorkloadGenerator
> Caused by: java.lang.ClassNotFoundException:
> org.apache.spark.ui.UIWorkloadGenerator
> at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
> Could not find the main class: org.apache.spark.ui.UIWorkloadGenerator.
> Program will exit.
> {code}
> I also noticed that if the jar is unzipped, and the classpath set to the
> currently directory, it "just works". Finally, if the assembly jar is
> compiled with JDK6, it also works. The error is seen with any class, not just
> the UIWorkloadGenerator. Also, this error doesn't exist in branch 0.9, only
> in master.
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