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Type: Bug
Resolution: Fixed
Priority: Minor
Component/s: bitbucket-branch-source-plugin
Labels:
None
Environment:
Bitbucket DC (standalone): 9.4.3 LTS
Jenkins: 2.492.1 LTS
Bitbucket Branch Source Plugin (cloudbees-bitbucket-branch-source): 935.1.3

Released As:
936.0.0

After updating Bitbucket, Jenkins and plugins we have started to get random connection errors when Bitbucket branch Source plugins tries to connect to Bitbucket.
We updated:
Bitbucket 8.19.13 LTS → 9.4.3 LTS
Jenkins: 2.479.2 LTS → 2.492.1 LTS
Bitbucket Branch Source Plugin (cloudbees-bitbucket-branch-source): 933.0.2 → 935.0.0 → 935.1.3 (we updated yesterday to the latest version, and still have issues)
...and tens of Jenkins plugins as usual.

This happens randomly. Usually re-run build works OK.
Before the updates, we didn't have the issue.

The error in Jenkins build log:

 [Bitbucket] Notifying commit build result
 ERROR: Could not send notifications
 java.io.IOException: Communication error for url: POST https://<bitbucket_dc_address>/rest/api/1.0/projects/<project>/repos/<repository>/commits/<commit_id>/builds HTTP/1.1
 	at PluginClassLoader for cloudbees-bitbucket-branch-source//com.cloudbees.jenkins.plugins.bitbucket.impl.client.AbstractBitbucketApi.doRequest(AbstractBitbucketApi.java:243)
 	at PluginClassLoader for cloudbees-bitbucket-branch-source//com.cloudbees.jenkins.plugins.bitbucket.impl.client.AbstractBitbucketApi.doRequest(AbstractBitbucketApi.java:250)
 	at PluginClassLoader for cloudbees-bitbucket-branch-source//com.cloudbees.jenkins.plugins.bitbucket.impl.client.AbstractBitbucketApi.postRequest(AbstractBitbucketApi.java:304)
 	at PluginClassLoader for cloudbees-bitbucket-branch-source//com.cloudbees.jenkins.plugins.bitbucket.server.client.BitbucketServerAPIClient.postBuildStatus(BitbucketServerAPIClient.java:511)
 	at PluginClassLoader for cloudbees-bitbucket-branch-source//com.cloudbees.jenkins.plugins.bitbucket.impl.notifier.BitbucketDefaulNotifier.notifyBuildStatus(BitbucketDefaulNotifier.java:51)
 	at PluginClassLoader for cloudbees-bitbucket-branch-source//com.cloudbees.jenkins.plugins.bitbucket.impl.notifier.BitbucketBuildStatusNotifications.createStatus(BitbucketBuildStatusNotifications.java:190)
 	at PluginClassLoader for cloudbees-bitbucket-branch-source//com.cloudbees.jenkins.plugins.bitbucket.impl.notifier.BitbucketBuildStatusNotifications.sendNotifications(BitbucketBuildStatusNotifications.java:271)
 	at PluginClassLoader for cloudbees-bitbucket-branch-source//com.cloudbees.jenkins.plugins.bitbucket.impl.notifier.BitbucketBuildStatusNotifications$JobCompletedListener.onCompleted(BitbucketBuildStatusNotifications.java:354)
 	at hudson.model.listeners.RunListener.lambda$fireCompleted$0(RunListener.java:223)
 	at jenkins.util.Listeners.lambda$notify$0(Listeners.java:59)
 	at jenkins.util.Listeners.notify(Listeners.java:67)
 	at hudson.model.listeners.RunListener.fireCompleted(RunListener.java:221)
 	at PluginClassLoader for workflow-job//org.jenkinsci.plugins.workflow.job.WorkflowRun.finish(WorkflowRun.java:666)
 	at PluginClassLoader for workflow-job//org.jenkinsci.plugins.workflow.job.WorkflowRun$GraphL.onNewHead(WorkflowRun.java:1082)
 	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.notifyListeners(CpsFlowExecution.java:1545)
 	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$3.run(CpsThreadGroup.java:521)
 	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService.lambda$wrap$2(CpsVmExecutorService.java:85)
 	at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:139)
 	at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
 	at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:68)
 	at jenkins.util.ErrorLoggingExecutorService.lambda$wrap$0(ErrorLoggingExecutorService.java:51)
 	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
 	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
 	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
 	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
 	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$1.call(CpsVmExecutorService.java:53)
 	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$1.call(CpsVmExecutorService.java:50)
 	at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:136)
 	at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:275)
 	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService.lambda$categoryThreadFactory$0(CpsVmExecutorService.java:50)
 	at java.base/java.lang.Thread.run(Thread.java:840)
 Caused by: org.apache.http.NoHttpResponseException: <bitbucket_dc_address>:443 failed to respond
 	at PluginClassLoader for apache-httpcomponents-client-4-api//org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:141)
 	at PluginClassLoader for apache-httpcomponents-client-4-api//org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:56)
 	at PluginClassLoader for apache-httpcomponents-client-4-api//org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:259)
 	at PluginClassLoader for apache-httpcomponents-client-4-api//org.apache.http.impl.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:163)
 	at PluginClassLoader for apache-httpcomponents-client-4-api//org.apache.http.impl.conn.CPoolProxy.receiveResponseHeader(CPoolProxy.java:157)
 	at PluginClassLoader for apache-httpcomponents-client-4-api//org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:273)
 	at PluginClassLoader for apache-httpcomponents-client-4-api//org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:125)
 	at PluginClassLoader for apache-httpcomponents-client-4-api//org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:272)
 	at PluginClassLoader for apache-httpcomponents-client-4-api//org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186)
 	at PluginClassLoader for apache-httpcomponents-client-4-api//org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
 	at PluginClassLoader for apache-httpcomponents-client-4-api//org.apache.http.impl.execchain.ServiceUnavailableRetryExec.execute(ServiceUnavailableRetryExec.java:85)
 	at PluginClassLoader for apache-httpcomponents-client-4-api//org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
 	at PluginClassLoader for apache-httpcomponents-client-4-api//org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
 	at PluginClassLoader for apache-httpcomponents-client-4-api//org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
 	at PluginClassLoader for cloudbees-bitbucket-branch-source//com.cloudbees.jenkins.plugins.bitbucket.impl.client.AbstractBitbucketApi.executeMethod(AbstractBitbucketApi.java:216)
 	at PluginClassLoader for cloudbees-bitbucket-branch-source//com.cloudbees.jenkins.plugins.bitbucket.impl.client.AbstractBitbucketApi.doRequest(AbstractBitbucketApi.java:224)
 	... 30 more

The load on Bitbucket & Jenkins seems to be normal. The network connection between the services is stabile.
Any idea what could cause this?
Any ideas and instructions to debug the issue deeper?

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