High CPU due to SunLayoutEngine.getEngine HashMap loops

Solution Verified - Updated 2 Aug 2024

Environment

Java

Issue

We see high CPU in calls like the following:

"http-localhost/127.0.0.1:8080-152" daemon prio=3 tid=0x0000000106217400 nid=0x52647 runnable [0xfffffffde20f8000..0xfffffffde20ff5c0]
   java.lang.Thread.State: RUNNABLE
	at java.util.HashMap.get(HashMap.java:305)
	at sun.font.SunLayoutEngine.getEngine(SunLayoutEngine.java:115)
	at sun.font.GlyphLayout$EngineRecord.init(GlyphLayout.java:642)
	at sun.font.GlyphLayout.nextEngineRecord(GlyphLayout.java:494)
	at sun.font.GlyphLayout.layout(GlyphLayout.java:426)
	at sun.font.ExtendedTextSourceLabel.createGV(ExtendedTextSourceLabel.java:308)
	at sun.font.ExtendedTextSourceLabel.getGV(ExtendedTextSourceLabel.java:294)
	at sun.font.ExtendedTextSourceLabel.createCharinfo(ExtendedTextSourceLabel.java:563)
	at sun.font.ExtendedTextSourceLabel.getCharinfo(ExtendedTextSourceLabel.java:492)
	at sun.font.ExtendedTextSourceLabel.getLineBreakIndex(ExtendedTextSourceLabel.java:438)
	at java.awt.font.TextMeasurer.calcLineBreak(TextMeasurer.java:308)
	at java.awt.font.TextMeasurer.getLineBreakIndex(TextMeasurer.java:544)
	at java.awt.font.LineBreakMeasurer.nextOffset(LineBreakMeasurer.java:340)
	at java.awt.font.LineBreakMeasurer.nextLayout(LineBreakMeasurer.java:422)
	at java.awt.font.LineBreakMeasurer.nextLayout(LineBreakMeasurer.java:395)

Resolution

Update your JDK to acquire a bug fix

Root Cause

SBR

JVM & Diagnostics

Product(s)

Red Hat JBoss Enterprise Application Platform

Components

jbossas

Category

Troubleshoot

Tags

This solution is part of Red Hat’s fast-track publication program, providing a huge library of solutions that Red Hat engineers have created while supporting our customers. To give you the knowledge you need the instant it becomes available, these articles may be presented in a raw and unedited form.