JasonMathison opened a new issue, #144:
URL: https://github.com/apache/maven-jar-plugin/issues/144

   ### Affected version
   
   3.4.2
   
   ### Bug description
   
   Sorry if am sending this bug report to the wrong place.  While there are 
MJAR tickets in Jira, I couldn't create a ticket against that project, so 
sending it here.
   
   We have been dealing with an intermittent problem where occasionally one of 
the jar files in our build would be non-functional. It turned out that the file 
was < 10KB, only containing the immediate project output, wtih no dependencies 
included.
   
   It appears that this could be an issue with the maven JAR plugin when maven 
is run with -T 3
   
   An example of the JAR file being correctly build looks like this:
   09:00:55  [INFO] --- maven-jar-plugin:3.4.2:jar (default-jar) @ 
maestro-ocelot-log-level-lambda ---
   09:00:55  [INFO] Building jar: 
/var/build/workspace/build-maestro/maestro-ocelot-log-level-lambda/target/maestro-ocelot-log-level-lambda.jar
   09:00:55  [INFO] 
   09:00:55  [INFO] --- maven-shade-plugin:3.6.0:shade (default) @ 
maestro-ocelot-log-level-lambda ---
   09:00:55  [INFO] 
   09:00:55  [INFO] -------------------------------------------------------
   09:00:55  [INFO]  T E S T S
   09:00:55  [INFO] -------------------------------------------------------
   09:00:55  [INFO] Including com.amazonaws:aws-lambda-java-core:jar:1.2.3 in 
the shaded jar.
   
   followed by lots of shade output and a functional zip file of ~ 55 MBs.
   
   An example of a build that results in a JAR file missing dependences looks 
like this:
   
   0:35:26  [INFO] --- maven-jar-plugin:3.4.2:jar (default-jar) @ 
maestro-ocelot-log-level-lambda ---
   10:35:26  [INFO] Building jar: 
/var/build/workspace/build-maestro/maestro-ocelot-log-level-lambda/target/maestro-ocelot-log-level-lambda.jar
   10:35:26  [INFO] Building jar: 
/var/build/workspace/build-maestro/maestro-contracts/target/maestro-contracts-0.0.1.3455-tests.jar
   10:35:26  [INFO] 
   10:35:26  [INFO] --- maven-shade-plugin:3.6.0:shade (default) @ 
maestro-ocelot-log-level-lambda ---
   10:35:26  [INFO] 
   10:35:26  [INFO] --- maven-install-plugin:3.1.4:install-file (default) @ 
maestro-contracts ---
   10:35:26  [INFO] No artifact matching filter 
net.logstash.logback:logstash-logback-encoder
   10:35:26  [INFO] No artifact matching filter 
com.inin.messages:inin-messages-events
   10:35:26  [INFO] Replacing original artifact with shaded artifact.
   10:35:26  [INFO] Replacing 
/var/build/workspace/build-maestro/maestro-ocelot-log-level-lambda/target/maestro-ocelot-log-level-lambda.jar
 with 
/var/build/workspace/build-maestro/maestro-ocelot-log-level-lambda/target/maestro-ocelot-log-level-lambda-0.0.1.3455-shaded.jar
   
   Notice that the shade plugin did not do any work, which I assume means that 
the JAR file didn't have any dependencies for it to clean up. The JAR file 
ended up being < 10 KBs.
   
   I found three examples of this issue. Every time that the zip file did not 
contain any dependencies the log file showed that 2 JAR files were being 
generated at the same time.
   
   Does this give enough to go on or would there be any tracing that I could 
enable to help troubleshoot this issue?


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