[Bug] [REMOTESHELL] remote shell task error in v3.4.1

[BilgeKaanGencdogan]

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• I had searched in the issues and found no similar issues.

What happened

Dolphinscheduler 3.4.1 Pseudo-Cluster installation. The error is remote shell task error. Similar issues exist like #16376, however this still exists.

I am gonna provide the worker-server log. When the remoteshell is executed, related error is thrown.

[WI-0][TI-3] - 2026-04-29 09:26:50.557 ERROR [exclusive-task-executor-container-worker-0] o.a.d.p.t.r.RemoteShellTask:[108] - shell task error
org.apache.dolphinscheduler.plugin.task.api.TaskException: Remote shell task error
	at org.apache.dolphinscheduler.plugin.task.remoteshell.RemoteExecutor.run(RemoteExecutor.java:105)
	at org.apache.dolphinscheduler.plugin.task.remoteshell.RemoteShellTask.handle(RemoteShellTask.java:104)
	at org.apache.dolphinscheduler.server.worker.executor.PhysicalTaskExecutor.doTriggerTaskPlugin(PhysicalTaskExecutor.java:77)
	at org.apache.dolphinscheduler.task.executor.AbstractTaskExecutor.start(AbstractTaskExecutor.java:81)
	at org.apache.dolphinscheduler.task.executor.worker.TaskExecutorWorker.start(TaskExecutorWorker.java:65)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: java.lang.NullPointerException: null
	at java.base/java.io.Reader.<init>(Reader.java:167)
	at java.base/java.io.InputStreamReader.<init>(InputStreamReader.java:109)
	at org.apache.dolphinscheduler.plugin.task.remoteshell.RemoteExecutor.runRemoteAndProcessLines(RemoteExecutor.java:243)
	at org.apache.dolphinscheduler.plugin.task.remoteshell.RemoteExecutor.runRemote(RemoteExecutor.java:231)
	at org.apache.dolphinscheduler.plugin.task.remoteshell.RemoteExecutor.getTaskPid(RemoteExecutor.java:207)
	at org.apache.dolphinscheduler.plugin.task.remoteshell.RemoteExecutor.run(RemoteExecutor.java:95)
	... 9 common frames omitted
[WI-0][TI-3] - 2026-04-29 09:26:50.558 ERROR [exclusive-task-executor-container-worker-0] o.a.d.t.e.w.TaskExecutorWorker:[75] - PhysicalTaskExecutor{id=3, name=test-remote-shell, stat=RUNNING} execute failed
org.apache.dolphinscheduler.plugin.task.api.TaskException: Execute shell task error
	at org.apache.dolphinscheduler.plugin.task.remoteshell.RemoteShellTask.handle(RemoteShellTask.java:110)
	at org.apache.dolphinscheduler.server.worker.executor.PhysicalTaskExecutor.doTriggerTaskPlugin(PhysicalTaskExecutor.java:77)
	at org.apache.dolphinscheduler.task.executor.AbstractTaskExecutor.start(AbstractTaskExecutor.java:81)
	at org.apache.dolphinscheduler.task.executor.worker.TaskExecutorWorker.start(TaskExecutorWorker.java:65)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: org.apache.dolphinscheduler.plugin.task.api.TaskException: Remote shell task error
	at org.apache.dolphinscheduler.plugin.task.remoteshell.RemoteExecutor.run(RemoteExecutor.java:105)
	at org.apache.dolphinscheduler.plugin.task.remoteshell.RemoteShellTask.handle(RemoteShellTask.java:104)
	... 8 common frames omitted
Caused by: java.lang.NullPointerException: null
	at java.base/java.io.Reader.<init>(Reader.java:167)
	at java.base/java.io.InputStreamReader.<init>(InputStreamReader.java:109)
	at org.apache.dolphinscheduler.plugin.task.remoteshell.RemoteExecutor.runRemoteAndProcessLines(RemoteExecutor.java:243)
	at org.apache.dolphinscheduler.plugin.task.remoteshell.RemoteExecutor.runRemote(RemoteExecutor.java:231)
	at org.apache.dolphinscheduler.plugin.task.remoteshell.RemoteExecutor.getTaskPid(RemoteExecutor.java:207)
	at org.apache.dolphinscheduler.plugin.task.remoteshell.RemoteExecutor.run(RemoteExecutor.java:95)
	... 9 common frames omitted

What you expected to happen

We have upgraded the dolphinscheduler form 3.2.0 to 3.4.1. This plugin works in v3.2.0

How to reproduce

You should create shell DataSource in the dolphin(click DataSource tab at the top), and fill the remote server info(port, ip address, username), then create test workflow which contains remoteshell plugin and select that dataSource in the remoteshell plugin screen and then start that workflow, while doing that observe the latest worker-server log.

Anything else

This problem occurs every remoteshell steps on the workflow. We can use shell plugin however we have lots of workflows that contain remoteshell plugin.

Version

3.4.1

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct