Java Stack Traces

Debugging with Java Stack Traces Daryl Banttari Analytics, Inc.

About Daryl
IT Professional since 1986
ColdFusion since 1997
Java since 2003
Allaire/Macromedia Consulting 2000-2005
Webapper (SeeFusion!)
Current: Analytics, Inc.

Agenda
Java and ColdFusion
What is a "Stack Trace"?
Reading a Stack Trace
Debugging with Stack Traces
Gathering Stack Traces

Java and ColdFusion
ColdFusion is a Java J2EE Application
Servlet Engine (JRun)
ColdFusion (cfmservlet)
Request Threads (your application)

Java Stack Traces
Snapshot in Time
Shows Calls, Not Data
Multiple Needed to Show Motion

"jrpp-352" runnable
at java.lang.Double.parseDouble(Double.java:220)?
at coldfusion.runtime.CFDouble.parseDouble(CFDouble.java:23)?
at coldfusion.runtime.CfJspPage.internalIsBoolean(CfJspPage.java:707)?
at coldfusion.runtime.CfJspPage._compare(CfJspPage.java:273)?
at cfApplication2ecfm726408707._factor5(D:Websites edacted.comApplication.cfm:3)?
at cfApplication2ecfm726408707.runPage(D:Websites edacted.comApplication.cfm:521)?
at coldfusion.runtime.CfJspPage.invoke(CfJspPage.java:147)?
at coldfusion.tagext.lang.IncludeTag.doStartTag(IncludeTag.java:357)?
at coldfusion.filter.CfincludeFilter.invoke(CfincludeFilter.java:62)?
at coldfusion.filter.CfincludeFilter.include(CfincludeFilter.java:30)?
at coldfusion.filter.ApplicationFilter.invoke(ApplicationFilter.java:93)?
at coldfusion.filter.RequestMonitorFilter.invoke(RequestMonitorFilter.java:48)?
at coldfusion.filter.PathFilter.invoke(PathFilter.java:80)?
at coldfusion.filter.ExceptionFilter.invoke(ExceptionFilter.java:47)?
at coldfusion.filter.ClientScopePersistenceFilter.invoke(ClientScopePersistenceFilter.java:28)?
at coldfusion.filter.BrowserFilter.invoke(BrowserFilter.java:35)?
at coldfusion.filter.GlobalsFilter.invoke(GlobalsFilter.java:43)?
at coldfusion.filter.DatasourceFilter.invoke(DatasourceFilter.java:22)?
at coldfusion.CfmServlet.service(CfmServlet.java:105)?
at jrun.servlet.FilterChain.doFilter(FilterChain.java:86)?
at com.seefusion.Filter.doFilter(Filter.java:49)?
at com.seefusion.SeeFusion.doFilter(SeeFusion.java:1494)?
at jrun.servlet.FilterChain.doFilter(FilterChain.java:94)?
at jrun.servlet.FilterChain.service(FilterChain.java:101)?
at jrun.servlet.ServletInvoker.invoke(ServletInvoker.java:91)?
at jrun.servlet.JRunInvokerChain.invokeNext(JRunInvokerChain.java:42)?
at jrun.servlet.JRunRequestDispatcher.invoke(JRunRequestDispatcher.java:249)?
at jrun.servlet.ServletEngineService.dispatch(ServletEngineService.java:527)?
at jrun.servlet.jrpp.JRunProxyService.invokeRunnable(JRunProxyService.java:192)?
at jrunx.scheduler.ThreadPool$DownstreamMetrics.invokeRunnable(ThreadPool.java:348)?
at jrunx.scheduler.ThreadPool$ThreadThrottle.invokeRunnable(ThreadPool.java:451)?
at jrunx.scheduler.ThreadPool$UpstreamMetrics.invokeRunnable(ThreadPool.java:294)?
at jrunx.scheduler.WorkerThread.run(WorkerThread.java:66)?

Debugging with Stack Traces
Examples

Recognizing Stack Elements
Jrun.* - Jrun
Ignore: jrun.servlet.jrpp.ProxyEndpoint.readFully
Suspect: jrun.servlet.jrpp.JrppOutputStream$SpillStream.write
Coldfusion.*
Functions: coldfusion.runtime.CfJspPage.*
Tags: coldfusion.tagext.sql.QueryTag
Probably Innocent Java
java.util.*
java.lang.*
Suspicious Java
java.net.*
java.io.*
Your Code!
cfApplication2ecfm726408707.runPage(D:Websites edacted.comApplication.cfm:577)?

Gathering Stack Traces
SeeFusion / SeeStack
CF8 Enterprise Server Monitor
jstack

Summary
Stack Traces are snapshots of threads
Multiple traces may be needed to diagnose slow/hung threads
Read thread stacks from bottom to top
Look for code line numbers and keywords

Q&A
Daryl Banttari
Analytics, Inc.

Java Stack Traces

by dbanttari on Jan 09, 2009

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Java Stack Traces — Presentation Transcript