(DEPRECATED) Apache Flink User Mailing List archive. - Re: Flink Stateful Function: The program's entry point class not found in the jar file

(DEPRECATED) Apache Flink User Mailing List archive.

Re: Flink Stateful Function: The program's entry point class not found in the jar file

Posted by Igal Shilman on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/Flink-Stateful-Function-The-program-s-entry-point-class-not-found-in-the-jar-file-tp40269p40335.html

Hi Le,

Indeed you have added the dependency correctly. But the resulting artifact doesn't contain the dependencies. You need to create a jar with dependencies ( via [1] or [2])

Take a look at [3] for a usage example of the maven shade plugin.

I hope this helps,

Igal.

[1] https://maven.apache.org/plugins/maven-assembly-plugin/usage.html

[2] https://maven.apache.org/plugins/maven-shade-plugin/

[3] https://github.com/apache/flink-statefun/blob/master/statefun-flink/statefun-flink-distribution/pom.xml#L126,L199

On Sat, Dec 26, 2020 at 11:52 PM Le Xu <[hidden email]> wrote:

Thanks Igal! I might be missing something here. I did place statefun-flink-distribution as part of my dependency in the pom (see line 46 at [1]). Is there a correct way to include the jar? I'm having the same problem across many examples I'm running.

[1] https://gist.github.com/flint-stone/059f00832d8b99af433a446771f4f740#file-pom-xml-L64

Thanks!

On Sat, Dec 26, 2020 at 2:23 PM Igal Shilman <[hidden email]> wrote:

Hello :-)

It seems like in your attached pom you are not bundling the dependencies. Check out the docs here [1].

[1] https://ci.apache.org/projects/flink/flink-statefun-docs-release-2.2/deployment-and-operations/packaging.html#flink-jar

On Wed, Dec 23, 2020 at 3:07 AM Le Xu <[hidden email]> wrote:

Hello!

I'm trying to deploy a Flink stateful function as a flink jar and I followed the instruction here. However I'm getting the error saying that the program entry point class was not found in the jar even after I added the dependency in my pom.

Running:

bin/flink run -c org.apache.flink.statefun.flink.core.StatefulFunctionsJob flink-statefun/statefun-examples/statefun-greeter-example/target/statefun-greeter-example-2.3-SNAPSHOT.jar

Producing the following error:

org.apache.flink.client.program.ProgramInvocationException: The program's entry point class 'org.apache.flink.statefun.flink.core.StatefulFunctionsJob' was not found in the jar file.
    at org.apache.flink.client.program.PackagedProgram.loadMainClass(PackagedProgram.java:389)
    at org.apache.flink.client.program.PackagedProgram.<init>(PackagedProgram.java:139)
    at org.apache.flink.client.program.PackagedProgram.<init>(PackagedProgram.java:61)
    at org.apache.flink.client.program.PackagedProgram$Builder.build(PackagedProgram.java:557)
    at org.apache.flink.client.cli.CliFrontend.buildProgram(CliFrontend.java:726)
    at org.apache.flink.client.cli.CliFrontend.getPackagedProgram(CliFrontend.java:242)
    at org.apache.flink.client.cli.CliFrontend.run(CliFrontend.java:223)
    at org.apache.flink.client.cli.CliFrontend.parseParameters(CliFrontend.java:916)
    at org.apache.flink.client.cli.CliFrontend.lambda$main$10(CliFrontend.java:992)
    at org.apache.flink.runtime.security.contexts.NoOpSecurityContext.runSecured(NoOpSecurityContext.java:30)
    at org.apache.flink.client.cli.CliFrontend.main(CliFrontend.java:992)
Caused by: java.lang.ClassNotFoundException: org.apache.flink.statefun.flink.core.StatefulFunctionsJob
    at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
    at org.apache.flink.util.FlinkUserCodeClassLoader.loadClassWithoutExceptionHandling(FlinkUserCodeClassLoader.java:61)
    at org.apache.flink.util.ChildFirstClassLoader.loadClassWithoutExceptionHandling(ChildFirstClassLoader.java:65)
    at org.apache.flink.util.FlinkUserCodeClassLoader.loadClass(FlinkUserCodeClassLoader.java:48)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at org.apache.flink.client.program.PackagedProgram.loadMainClass(PackagedProgram.java:387)
    ... 10 more

Here is my modified pom.xml. The original version of the pom file can be found here here. It seems that adding the extra dependency of statefun-flink-distribution has no effect. Any suggestions?

Thanks!

Le