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Trystan commented on FLINK-29288: --------------------------------- With this change, what is the correct procedure to put job jars on the classpath in Application mode with the k8s operator? # Is *jarURI* absolutely required? # Will classes be loaded once, or multiple times? # How does this relate to the flink docs around classloading? [https://nightlies.apache.org/flink/flink-docs-release-1.16/docs/ops/debugging/debugging_classloading/#avoiding-dynamic-classloading-for-user-code] > Can't start a job with a jar in the system classpath > ---------------------------------------------------- > > Key: FLINK-29288 > URL: https://issues.apache.org/jira/browse/FLINK-29288 > Project: Flink > Issue Type: Bug > Components: Kubernetes Operator > Affects Versions: kubernetes-operator-1.1.0 > Reporter: Yaroslav Tkachenko > Priority: Major > Labels: pull-request-available > Fix For: kubernetes-operator-1.2.0 > > > I'm using the latest (unreleased) version of the Kubernetes operator. > It looks like currently, it's impossible to use it with a job jar file in the > system classpath (/opt/flink/lib). *jarURI* is required and it's always > passed as a *pipeline.jars* parameter to the Flink process. In practice, it > means that the same class is loaded twice: once by the system classloader and > another time by the user classloader. This leads to exceptions like this: > {quote}java.lang.LinkageError: loader constraint violation: when resolving > method 'XXX' the class loader org.apache.flink.util.ChildFirstClassLoader > @47a5b70d of the current class, YYY, and the class loader 'app' for the > method's defining class, ZZZ, have different Class objects for the type AAA > used in the signature > {quote} > In my opinion, jarURI must be made optional even for the application mode. In > this case, it's assumed that it's already available in the system classpath. -- This message was sent by Atlassian Jira (v8.20.10#820010)