Problem

JIRA UI just hangs when try to open the view issue screen and accessing the view issue screen through search issue navigator

• Only happens on client side as in the browser will hangs and CPU utilization increased to 100%
• Server side does not shows any utilization issue or spikes
• Same for all browser
• Seems to be rendering issue 

The following appears in the atlassian-jira.log

2015-07-27 10:51:45,134 ajp-apr-8009-exec-9 ERROR slongo 651x9x7 1bvqlbd 172.16.10.128 /secure/Dashboard.jspa [jira.template.velocity.VelocityEngineFactory$Default] Exception initialising Velocity: org.apache.velocity.exception.VelocityException: Velocimacro : Error using VM library : templates/email/macros.vm
org.apache.velocity.exception.VelocityException: Velocimacro : Error using VM library : templates/email/macros.vm
	at org.apache.velocity.runtime.VelocimacroFactory.initVelocimacro(VelocimacroFactory.java:219)
	at org.apache.velocity.runtime.RuntimeInstance.init(RuntimeInstance.java:261)
	at org.apache.velocity.runtime.RuntimeInstance.init(RuntimeInstance.java:589)
	at org.apache.velocity.app.VelocityEngine.init(VelocityEngine.java:135)
	at com.atlassian.jira.template.velocity.VelocityEngineFactory$Default.initialise(VelocityEngineFactory.java:69)
	at com.atlassian.jira.template.velocity.VelocityEngineFactory$Default.access$000(VelocityEngineFactory.java:23)
	at com.atlassian.jira.template.velocity.VelocityEngineFactory$Default$1.create(VelocityEngineFactory.java:34)
	at com.atlassian.jira.template.velocity.VelocityEngineFactory$Default$1.create(VelocityEngineFactory.java:29)
	at com.atlassian.util.concurrent.LazyReference$Sync.run(LazyReference.java:325)
	at com.atlassian.util.concurrent.LazyReference.getInterruptibly(LazyReference.java:143)

Diagnosis

Environment

• Tested on all browser, ensure that this is impacting all browser and not a browser issue

Diagnostic Steps

• Verify  from the logs, on modified files section, VM files has been modified previously etc.

•      Modified Files                                : templates/email/text/issueassigned.vm, templates/email/html/includes/fields/worklog.vm, templates/email/html/includes/fields/labels.vm, templates/email/text/issuedeleted.vm, templates/email/html/includes/emailconstants.vm, templates/email/html/issuementioned.vm, templates/email/text/issueworklogdeleted.vm, templates/email/html/issueresolved.vm, templates/email/text/issuecommentedited.vm, templates/email/html/includes/fields/comment.vm, templates/email/text/filtersubscription.vm, templates/email/html/includes/fields/worklogchanges.vm, templates/email/html/includes/header.vm, templates/email/html/includes/fields/issuekeysummary.vm, log4j.properties, templates/email/html/issuecommentedited.vm, templates/email/html/usercreated-nopassword.vm, templates/email/html/issueclosed.vm, templates/email/html/filtersubscription.vm, templates/email/html/issuecommented.vm, templates/email/html/includes/fields/attachments.vm, templates/email/html/issuereopened.vm, templates/email/text/contactadministrator.vm, templates/email/html/issuemoved.vm, templates/email/html/issuegenericevent.vm, templates/email/macros.vm, templates/email/text/issueupdated.vm, templates/email/html/contactadministrator.vm, templates/email/html/issuedeleted.vm, templates/email/text/includes/footer.vm, templates/email/html/issueworkstarted.vm, templates/email/text/issueworklogupdated.vm, templates/email/html/includes/fields/timetracking.vm, templates/email/text/forgotpassword.vm, templates/email/text/includes/issuesummary.vm, templates/email/html/includes/fields/affectsversions.vm, templates/email/html/includes/fields/status.vm, templates/email/html/includes/footer.vm, jira-application.properties, templates/email/html/issuenotify.vm, templates/email/html/includes/fields/description.vm, templates/email/html/includes/fields/assignee.vm, templates/email/text/issueresolved.vm, templates/email/text/issueworkstopped.vm, templates/email/html/issueassigned.vm, templates/email/html/issueworklogdeleted.vm, templates/email/html/includes/fields/reporter.vm, templates/email/text/issuecreated.vm, templates/email/html/includes/fields/components.vm, templates/email/text/issuegenericevent.vm, templates/email/html/includes/userdetails.vm, templates/email/html/includes/fields/createddate.vm, templates/email/html/issueupdated.vm, templates/email/html/includes/fields/issuekey.vm, velocity.properties, templates/email/text/issuereopened.vm, templates/email/text/issueclosed.vm, templates/email/text/issuementioned.vm, templates/email/html/includes/fields/fixversions.vm, templates/email/html/includes/fields/resolveddate.vm, templates/email/html/includes/summary-topleft.vm, templates/email/html/includes/fields/securitylevel.vm, templates/email/html/includes/fields/project.vm, templates/email/html/includes/fields/duedate.vm, templates/email/html/includes/fields/environment.vm, templates/email/text/issueworklogged.vm, templates/email/html/issueworklogupdated.vm, templates/email/html/includes/fields/issuetype.vm, templates/email/html/includes/fields/changelog.vm, templates/email/text/issuemoved.vm, templates/email/html/includes/fields/priority.vm, templates/email/html/issuecreated.vm, templates/email/html/usercreated.vm, templates/email/text/issuecommented.vm, templates/email/html/issueworkstopped.vm, seraph-config.xml, templates/email/html/issueworklogged.vm, templates/email/text/issueworkstarted.vm

Cause

• From the logs, this is caused by macros.vm

• These files have been modified and will not able to work properly

  : Error using VM library : templates/email/macros.vm

Resolution

• Replacing the file with a default file from a vanilla instance will fix it
• Replace any further file that is impacted shown in logs if needed