throw NPE when copy file from pod to local

[ttbadr]

I got an NPE when I try to copy a file from pod to local, here is my code:

getClient().pods()
        .withName(podName)
        .inContainer(containerName)
        .dir(pathInPod)
        .copy(Paths.get(localPath));

exception:

Aug 07, 2021 12:00:06 AM io.fabric8.kubernetes.client.utils.InputStreamPumper lambda$pump$0
SEVERE: Error while pumping stream.
java.lang.NullPointerException: Cannot invoke "java.io.InputStream.available()" because "this.val$is" is null
	at io.fabric8.kubernetes.client.utils.InputStreamPumper$1.read(InputStreamPumper.java:53)
	at io.fabric8.kubernetes.client.utils.InputStreamPumper.transferTo(InputStreamPumper.java:76)
	at io.fabric8.kubernetes.client.utils.InputStreamPumper.lambda$pump$0(InputStreamPumper.java:89)
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1800)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
	at java.base/java.lang.Thread.run(Thread.java:831)

fabric8 version is 5.6.0

Update:
I tried it again use the same params, I found that the file copied from the pod successfully, but I still got the same NPE

[rohanKanojia]

Are valid values being passed to dir() and copy methods? Do you have some simple reproducer project which we can use?

[shawkins]

If it's possible that there can be no in nor inputPipe, then this npe could occur - the old code wasn't doing an explicit null check before starting the pumper, so there's not one in the new code. This is simply logged, not actually thrown, correct? I'm guessing it was swallowed before.

[ttbadr]

Are valid values being passed to dir() and copy methods? Do you have some simple reproducer project which we can use?

the values are valid I confirmed.
I tried it again use the same params, I found that the file copied from the pod successfully, but I still got the same NPE