SamBarker commented on code in PR #25445:
URL: https://github.com/apache/flink/pull/25445#discussion_r1794173964


##########
flink-kubernetes/src/main/java/org/apache/flink/kubernetes/KubernetesClusterDescriptor.java:
##########
@@ -214,9 +215,12 @@ public ClusterClientProvider<String> 
deployApplicationCluster(
 
         applicationConfiguration.applyToConfiguration(flinkConfig);
 
-        // No need to do pipelineJars validation if it is a PyFlink job.
+        // No need to do pipelineJars validation if it is a PyFlink job or no 
jars specified in
+        // pipeline.jars (to use jars in system classpath instead).
         if 
(!(PackagedProgramUtils.isPython(applicationConfiguration.getApplicationClassName())
-                || 
PackagedProgramUtils.isPython(applicationConfiguration.getProgramArguments()))) 
{
+                        || PackagedProgramUtils.isPython(
+                                
applicationConfiguration.getProgramArguments()))
+                && flinkConfig.get(PipelineOptions.JARS) != null) {

Review Comment:
   Would it make be useful to push this compound condition to 
`PackageProgramUtils` as something like `hasClasspath` or `usesSystemClasspath` 
(with the implied flip to false)?



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