Collaborative Editing cannot be enabled in Confluence due to "java.lang.NumberFormatException: For input string" error
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Summary
Problem
Collaborative Editing cannot be enabled. When making the following actions, the UI hangs or loads indefinitely:
Go to Cog → General Configuration → Collaborative editing
Click on Change mode
Set to ON
Or, restart Synchrony
The following appears in the atlassian-confluence.log
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2018-06-10 10:00:33,650 INFO [ListenableFutureAdapter-thread-1] [plugins.synchrony.bootstrap.DefaultSynchronyProcessManager] startup Starting Synchrony and enabling Collaborative Editing
2018-06-10 10:00:33,655 ERROR [Long running task: Restart Synchrony Task] [plugins.synchrony.tasks.AbstractConfigLongRunningTask] runInternal An error occurred when running a Synchrony ConfigLongRunningTask
-- url: /rest/synchrony-interop/restart | referer: http://wiki.confluence.com/admin/confluence-collaborative-editor-plugin/configure.action | traceId: 0c88ade652e9e0 | userName: admin
java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:592)
at java.lang.Integer.parseInt(Integer.java:615)
at com.atlassian.confluence.plugins.synchrony.utils.SynchronyProcessUtil.killRunningSynchronyProcess(SynchronyProcessUtil.java:49)
at com.atlassian.confluence.plugins.synchrony.bootstrap.DefaultSynchronyProcessManager.startup(DefaultSynchronyProcessManager.java:521)
at com.atlassian.confluence.plugins.synchrony.bootstrap.DefaultSynchronyProcessManager.lambda$restart$15(DefaultSynchronyProcessManager.java:734)
at com.atlassian.util.concurrent.Promises$Of$1.apply(Promises.java:263)
at com.atlassian.util.concurrent.Promises$2.onSuccess(Promises.java:185)
at com.google.common.util.concurrent.Futures$6.run(Futures.java:1319)
at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:457)
at com.google.common.util.concurrent.ExecutionList.executeListener(ExecutionList.java:156)
at com.google.common.util.concurrent.ExecutionList.execute(ExecutionList.java:145)
at com.google.common.util.concurrent.JdkFutureAdapters$ListenableFutureAdapter$1.run(JdkFutureAdapters.java:177)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)Diagnosis
Environment
Confluence 6+
Diagnostic Steps
Check if enabling Collaborative editing through REST cause the same error by running this on a terminal:
1curl -X POST --user admin_user:password --header "X-Atlassian-Token: no-check" https://your.confluence.url/rest/synchrony-interop/disableℹ️ Make sure to replace the admin_user:password with your admin credentials, and the Confluence base URL
Check that there is no Synchrony process running
Cause
Confluence tries to kill the Synchrony process, but Synchrony is not currently running or it is unable to stop the process. The error likely comes from a corrupt cache/file.
Solution
Resolution
From the Manage Add-ons page, disable and re-enable the Synchrony Interop plugin
Shutdown Confluence
How to clear the apps (plugins) cache in Confluence Data Center
Remove the /confluence_install/temp/synchrony.pid file
Restart Confluence
Restart Synchrony / Collaborative editing
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