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.

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

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)

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

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)?

"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

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)?

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

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

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.

Daryl Banttari

Analytics, Inc.