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Details

Type: Bug
Resolution: Won't Fix
Priority: High
Fix Version/s: None
Affects Version/s: 6.15.10
Component/s: Search - Core
Labels:
None

Support reference count:
1
Symptom Severity:
Severity 2 - Major
Bug Fix Policy:
View Atlassian Server bug fix policy

Description

Issue Summary

Hit the Confluence search box on the top left of the screen there is a spinning wheel and then nothing.

Checking the browser logs (F12 or Developer Tools -> Network tab), it's possible to see a HTTP 500 Error:

Steps to Reproduce

Try to search
It fails

Expected Results

The search works.

Actual Results

The below exception is thrown in the atlassian-confluence.log:

2020-07-17 16:37:45,210 ERROR [ajp-nio-127.0.0.1-8009-exec-208] [[Standalone].[localhost].[/].[file-server]] log Servlet.service() for servlet [file-server] threw exception
 -- referer: https://XXXXXXXX | url: /s/XXXXXXXX-CDN/XX/XXX/XXXXX/XXXXXXX/_/download/contextbatch/js/confluence-search-ui-plugin-main,-_super/batch.js | traceId: XXXXXX | userName: XXXXX

java.lang.StackOverflowError
	at java.util.regex.Pattern$Branch.match(Pattern.java:4618)
	at java.util.regex.Pattern$GroupHead.match(Pattern.java:4672)
	at java.util.regex.Pattern$Branch.match(Pattern.java:4618)
	at java.util.regex.Pattern$GroupHead.match(Pattern.java:4672)
	at java.util.regex.Pattern$Loop.match(Pattern.java:4799)
	at java.util.regex.Pattern$GroupTail.match(Pattern.java:4731)
	at java.util.regex.Pattern$BranchConn.match(Pattern.java:4582)
	at java.util.regex.Pattern$BmpCharProperty.match(Pattern.java:3812)
	at java.util.regex.Pattern$Branch.match(Pattern.java:4618)
	at java.util.regex.Pattern$GroupHead.match(Pattern.java:4672)
	at java.util.regex.Pattern$Loop.match(Pattern.java:4799)
	........

The lines related to java.util.regex.Pattern go on forever for hundred of pages.

This is most likely caused by https://ecosystem.atlassian.net/browse/PLUGWEB-422

Workaround

Increase the Java parameter -Xss to a higher value.

This parameter is the responsible to address the recursive calls made on the Java code, exactly what is happening as shown in the Exception above, therefore increase it can solve the issue at some degree.

More details about this parameter can be found in this discussion:

JVM option -Xss - What does it do exactly?