Not Specifying --class for spark-submit

[jgarrett <jo...@noblis-nsp.com>]

Hey all,

I am trying to run spark-submit on a Jar file without specifying the --class
parameter so that it will load the jar's main class.  Using the following
command:

spark-submit MyJar.jar

I get this error:

Error: Cannot load main class from JAR: file:/MyJar.jar

After digging into the issue, it seems that the problem occurs on this line:
https://github.com/apache/spark/blob/2f54543815c0905dc958d444ad638c23a29507c6/core/src/main/scala/org/apache/spark/deploy/SparkSubmitArguments.scala#L127

The JarFile constructor does not like the "file:/" that was prepended to the
file name.

I tried opening up the scala console and trying it out myself and confirmed
that 'new JarFile("file:/MyJar.jar")' does throw a FileNotFoundException,
while 'new JarFile("MyJar.jar")' works as expected.

Has anyone encountered this issue or know of a way around it?  I would like
to avoid specifying the --class parameter if possible.

Thanks,
- Johnathan Garrett



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