maltesander commented on PR #11002:
URL: https://github.com/apache/nifi/pull/11002#issuecomment-4150364981
Reproduced on 2.6.0 and stumbled over this independently. Some gateway
communication attempts (25?) and then fails.
```
[...]
2026-03-27 07:43:48,618 DEBUG [Initialize CheckDuplicates]
o.a.nifi.py4j.client.NiFiPythonGateway Beginning method invocation
InvocationBindings[method=public abstract boolean
org.apache.nifi.python.PythonProcessorDetails.isBundledWithDependencies(),
target=p36, args=null]
2026-03-27 07:43:48,618 INFO [python-log-112] py4j.java_gateway Received
command c on object id p36
2026-03-27 07:43:48,618 DEBUG [Initialize CheckDuplicates]
o.a.nifi.py4j.client.NiFiPythonGateway Ending method invocation
InvocationBindings[method=public abstract boolean
org.apache.nifi.python.PythonProcessorDetails.isBundledWithDependencies(),
target=p36, args=null]
2026-03-27 07:43:48,628 DEBUG [Initialize CheckDuplicates]
o.a.n.p.c.PythonProxyInvocationHandler Invoking public abstract
java.lang.String org.apache.nifi.python.PythonController.ping() on
PythonProxy[targetObjectId=t] with args [] using command c
t
ping
e
2026-03-27 07:43:48,628 DEBUG [Initialize CheckDuplicates]
o.a.nifi.py4j.client.NiFiPythonGateway Beginning method invocation
InvocationBindings[method=public abstract java.lang.String
org.apache.nifi.python.PythonController.ping(), target=t, args=null]
2026-03-27 07:43:48,629 DEBUG [Initialize CheckDuplicates]
o.a.nifi.py4j.client.NiFiPythonGateway Ending method invocation
InvocationBindings[method=public abstract java.lang.String
org.apache.nifi.python.PythonController.ping(), target=t, args=null]
2026-03-27 07:43:48,629 DEBUG [Initialize CheckDuplicates]
org.apache.nifi.py4j.PythonProcess Failed to start Py4J Server
py4j.Py4JException: Error while obtaining a new communication channel
at py4j.CallbackClient.getConnectionLock(CallbackClient.java:257)
at py4j.CallbackClient.sendCommand(CallbackClient.java:377)
at py4j.CallbackClient.sendCommand(CallbackClient.java:356)
at
org.apache.nifi.py4j.client.PythonProxyInvocationHandler.invoke(PythonProxyInvocationHandler.java:86)
at jdk.proxy6/jdk.proxy6.$Proxy63.ping(Unknown Source)
at org.apache.nifi.py4j.PythonProcess.start(PythonProcess.java:145)
at
org.apache.nifi.py4j.StandardPythonBridge.getProcessForNextComponent(StandardPythonBridge.java:260)
at
org.apache.nifi.py4j.StandardPythonBridge.createProcessorBridge(StandardPythonBridge.java:137)
at
org.apache.nifi.py4j.StandardPythonBridge.lambda$createProcessor$7(StandardPythonBridge.java:154)
at
org.apache.nifi.python.processor.PythonProcessorProxy.lambda$new$0(PythonProcessorProxy.java:82)
at java.base/java.lang.VirtualThread.run(Unknown Source)
Caused by: java.net.ConnectException: Connection refused
at java.base/sun.nio.ch.Net.pollConnect(Native Method)
at java.base/sun.nio.ch.Net.pollConnectNow(Unknown Source)
at java.base/sun.nio.ch.NioSocketImpl.connect(Unknown Source)
at java.base/java.net.SocksSocketImpl.connect(Unknown Source)
at java.base/java.net.Socket.connect(Unknown Source)
at java.base/java.net.Socket.connect(Unknown Source)
at java.base/java.net.Socket.<init>(Unknown Source)
at java.base/java.net.Socket.<init>(Unknown Source)
at java.base/javax.net.DefaultSocketFactory.createSocket(Unknown Source)
at py4j.CallbackConnection.start(CallbackConnection.java:226)
at py4j.CallbackClient.getConnection(CallbackClient.java:238)
at py4j.CallbackClient.getConnectionLock(CallbackClient.java:250)
... 10 common frames omitted
```
I
This leads to otherwise strange behavior. The basic stuff like Heartbeats,
Leader etc. works, sometimes i could even login into the canvas, which was
greyed out (like in no permissions) and was empty, otherwise just the "Flow is
initializing" error.
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