Open Source Debugging v1.3.2
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The presentation of my personal favorites in the category of Open Source Debugging tools to the Calgary Java Users Group.
![cURL flags
-X [action]
Selects an HTTP verb (POST,GET, PUT, DELETE).](https://image.slidesharecdn.com/opensourcedebuggingv1-3-2-090615231220-phpapp01/85/Open-Source-Debugging-v1-3-2-23-320.jpg)
![cURL flags
-H [HTTP header]
Set the Accept or Content-Type headers
(e.g. text/xml, or application/json)
Useful, if the web server/service parses them.](https://image.slidesharecdn.com/opensourcedebuggingv1-3-2-090615231220-phpapp01/85/Open-Source-Debugging-v1-3-2-25-320.jpg)
![cURL flags
-d [variable]
or
--data [variable]
Set a data block to transmit to the URL.
Automatically sets the action to POST.](https://image.slidesharecdn.com/opensourcedebuggingv1-3-2-090615231220-phpapp01/85/Open-Source-Debugging-v1-3-2-31-320.jpg)
![h n ame
wit
ST data
PO
curl -d "agent[name]=Ann Banks" http://localhost/agents/1](https://image.slidesharecdn.com/opensourcedebuggingv1-3-2-090615231220-phpapp01/85/Open-Source-Debugging-v1-3-2-32-320.jpg)
![cURL flags
-o [filename]
Output results to a file.
All formatting and encoding intact.](https://image.slidesharecdn.com/opensourcedebuggingv1-3-2-090615231220-phpapp01/85/Open-Source-Debugging-v1-3-2-34-320.jpg)
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Open Source Debugging v1.3.2
- 1. Open Source Debugging Tools m y favorite a pps to ease de bugging pain by Matthew McCullough of Ambient Ideas, LLC
- 2. Matthew
- 3. Quick bits a bout me... -Denver pen source architect -O or of Mave n Refcard -Auth -NF JS speaker -Mentor
- 4. OSS Debug Tools
- 5. Java Network Web Service OSS Debug Tools Filesystem JavaScript
- 6. N ot
- 7. I nst ead
- 8. Wh y open source deb ugging tools?
- 11. Today’s Deal
- 12. - 90 minute investment
- 13. - Hours back in return
- 14. NetworkCentric
- 15. Java Network Web Service OSS Debug Tools Filesystem JavaScript
- 17. We’re having a problem on the web site...web service...whatever you call it.
- 18. It returns the correct <pointy> code stuff for some folks but not others.
- 19. Purpose ‣ Command line URL tasks. ‣ Test web services. ‣ Inspect raw HTML pages.
- 23. cURL flags -X [action] Selects an HTTP verb (POST,GET, PUT, DELETE).
- 25. cURL flags -H [HTTP header] Set the Accept or Content-Type headers (e.g. text/xml, or application/json) Useful, if the web server/service parses them.
- 26. cURL examples sponse Re est XML R equ curl -X GET -H "Accept: text/xml" http://localhost/agents/1
- 27. tion n ac pp cu rl i ils a Gra ting w ith a etec nt d onte vice c ser
- 28. REST
- 29. Cr eate curl -X POST http://localhost/agents/?name=Ben Read curl -X GET http://localhost/agents/1 Up date curl -X PUT http://localhost/agents/1/?name=Benny De lete curl -X DELETE http://localhost/agents/1
- 30. tion n ac pp cu rl i Gra ils a wi th a vice EST ser R
- 31. cURL flags -d [variable] or --data [variable] Set a data block to transmit to the URL. Automatically sets the action to POST.
- 32. h n ame wit ST data PO curl -d "agent[name]=Ann Banks" http://localhost/agents/1
- 33. assin ga cu rl p var iable d ata
- 34. cURL flags -o [filename] Output results to a file. All formatting and encoding intact.
- 35. http is just the beginning
- 36. Supported Protocols ‣ HTTP ‣ HTTPS ‣ FTP ‣ FTPS ‣ TFTP ‣ SCP ‣ SFTP ‣ Telnet ‣ LDAP
- 39. The operations desk called.
- 40. They say our apps is using too much network bandwidth.
- 41. Can you take a look at the transmitted data?
- 42. What’s being sent over the wire?
- 43. TCPDump Purpose ‣ Output headers of packets from a network. ‣ Filter results with powerful expressions. ‣ Save captured data to a file.
- 44. TCPDump Useful for ‣ Debugging network traffic. ‣ Examining socket communications. ‣ Inspecting web service calls. ‣ Examining network data as a 3rd party
- 45. TCPDump commands tcpdump -i en1
- 46. TCPDump commands tcpdump -i lo0
- 47. TCPDump commands fo in et ck pa d se ea cr In tcpdump -i en1 -v
- 48. TCPDump commands es m na ot ,n rs be m nu rt po tcpdump -i en1 -n
- 49. TCPDump commands ut tp ou I CI AS tcpdump -i en1 -A
- 50. TCPDump commands tu tp ou I CI AS + EX H tcpdump -i en1 -X
- 51. TCPDump commands on si es pr Ex tcpdump -i en1 icmp
- 52. TCPDump commands on si es pr Ex tcpdump -i en1 tcp port 80
- 53. Destination Address Source Address Length DSAP SSAP Control SNAP Data Ethernet Frame, up to 1514 bytes FCS
- 54. TCPDump commands h gt en l ap sn tcpdump -i en1 -s 1514
- 55. TCPDump commands s et ck pa 20 re tu p Ca tcpdump -i en1 -c20
- 57. Wireshark (Cross Platform) Purpose Network protocol analyzer. A GUI on tcpdump
- 58. Wireshark Useful features Online and offline operation. Reading TCPDump data files.
- 59. Wireshark Useful features Logical packet parsing, display. Decryption.
- 60. Wireshark usage Gotcha on Mac OSX At a terminal, upon each boot, type: sudo chown YOURUSERNAME /dev/bpf* Gotcha on Windows Promiscuous mode doesn’t always work.
- 62. Eavesdrop
- 63. Eavesdrop (mac) Purpose -A Mac-specific network packet inspector. -Listens to TCP traffic between machines.
- 66. Why does our app crash whenever we have a lot of users?
- 67. How many?
- 68. Oh, 10... or 1000. Something like that.
- 69. Maybe 10,000.
- 70. JMeter (Cross Platform) Purpose Load test or sequence test HTML, EJBs, SOAP, and many other interfaces.
- 71. JMeter (Cross Platform) Useful For Testing web sites under strain. Finding load-induced problems. Graphing performance metrics.
- 72. Caution!
- 74. JMeter in action
- 75. JMeter in action
- 77. Survey
- 78. StackOverflow.com
- 79. What’s your favorite Open Source Debugging Tool?
- 80. ❸ VisualVM
- 81. ❷ Eclipse
- 82. ❶ System.out.println(brokenobj System.out.println(broke System.out.println(brokenobj); nobj) System.out.println(brokenobj); Sy stem.out.printl n(brokenobj); System.out.prin tln(brokenobj); System.out.println(brokenobj); System.out.println(brokenobj) Syst em.out.println(brokenobj); ystem.out.println(brokenobj); ystem.out.println(broken obj); System.out.println(brokenob System.out.println(brokenobj); System.out.pri ntln(brokenobj) System.out.println(brokenobj);
- 83. buckle up
- 84. Java-Centric Tools
- 85. Java Network Web Service OSS Debug Tools Filesystem JavaScript
- 86. JPS Process List
- 87. What JVM options did we use when we started up the app server?
- 88. I’m gonna need a list of the other java processes running on that box too.
- 89. jps
- 90. jps -l Sh ow fu ll pa ck age na m e
- 91. Sh ow jps -l -v Sh fu ow ll pa JV ck M ag e ar na gu m m en e ts
- 92. Sh ow Sh fu ow ll pa JV ck M ag jps -l -v -m Sh ar e na ow gu m m e m en ts ain () ar gu m en ts
- 93. only local?
- 94. jps 10.15.25.32
- 95. How?
- 97. Allow-all policy
- 98. y lic Po ur Yo jstatd -J-Djava.security.policy=allowall.pol
- 99. grant codebase "file:${java.home}/../lib/tools.jar" { permission java.security.AllPermission; };
- 100. Another port besides 1099?
- 101. y lic Po ur rt Yo Po jstatd -J-Djava.security.policy=your.pol -p 1099
- 102. jps 10.15.25.32
- 103. jstat process info
- 104. jstat -options
- 105. Sh ow ga rb ag e jstat -gcutil <pid> co lle ct io n
- 106. es pl m sa n ee sn tw io tit be pe s re m jstat -gcutil <pid> 500 999
- 107. es lin X y er ev er ad he ow Sh jstat -gcutil -h5 <pid> 500 999
- 108. jmap memory MAPs
- 109. Heap Dump
- 111. Histogram
- 112. jmap -histo <pid>
- 113. jstack stack dumps
- 114. jstack <pid>
- 115. jhat Heap Analysis
- 116. jhat <heapfile>
- 118. Javap Class File Disassembler
- 119. We added a new method to a class.
- 120. Is it on the server-deployed copy of the app?
- 121. javap classfile
- 122. e os rb Ve javap -v classfile
- 123. Ve rb os In e te rn al ty pe javap -v -s classfile si gn at ur es
- 124. Ve rb In os te e Di rna sp l t la yp y e va ria sign bl at e javap -v -s -l classfile ur ta es bl es
- 125. Ve rb In os te e rn Di sp al la ty y pe va si Sh ria gn bl atu ow e Pr ta res bl iva es te m et ho ds javap -v -s -l -private classfile
- 127. We’re having, um some “problems” with the app in production.
- 128. You’ll need to figure it out on the live production app.
- 129. No, you can’t restart the app!
- 130. No, you can’t put Eclipse on the production box!!
- 131. Purpose Deeply inspect many metrics of Java processes.
- 132. Useful for ‣ Discovering the GC cycles of your app.
- 133. Useful for ‣ Discovering the GC cycles of your app. ‣ Finding the largest memory usage culprits.
- 134. Useful for ‣ Discovering the GC cycles of your app. ‣ Finding the largest memory usage culprits. ‣ Diffing memory snapshots.
- 135. Useful for ‣ Discovering the GC cycles of your app. ‣ Finding the largest memory usage culprits. ‣ Diffing memory snapshots. ‣ Injecting btrace code.
- 136. Useful for ‣ Discovering the GC cycles of your app. ‣ Finding the largest memory usage culprits. ‣ Diffing memory snapshots. ‣ Injecting btrace code. ‣ Snapping heapdumps.
- 137. VisualVM in action
- 138. Gotcha Download version 1.1.1 even if your JDK includes 1.0. Standalone version always ahead of JVM version.
- 139. JStatd Daemon
- 140. We don’t have screens on our servers.
- 141. Can you run these VisualVeeeEmmmms remotely?
- 142. y lic Po ur Yo jstatd -J-Djava.security.policy=your.pol
- 143. Remotely ‣ Attach VisualVM ‣ Run any VisualVM debugging tool ‣ Run JPS
- 144. SerialVer Hash
- 145. Is the deployed version of the bean compatible with the copy we are about to release?
- 146. Yeah, we don’t set serialVersionUID
- 147. serialver classname
- 148. MyBean: static final long serialVersionUID = -4193605393175618625L;
- 149. serialver -show
- 151. Eclipse Memory Analyzer (MAT)
- 152. Find out what objects are using so much memory in the app!
- 153. EclipseMemoryAnalyzer Purpose ‣ Visually investigate memory usage inside a heap dump.
- 154. EclipseMemoryAnalyzer Purpose Investigate memory usage. Useful for Visualizing memory footprint. Finding memory leaks. Querying through (OQL) allocated memory. Discovering heavy memory allocation sources.
- 155. EclipseMemoryAnalyzer Gotcha Doesn’t create heap dumps, just analyzes. Available as a plugin or standalone RCP app.
- 157. ObjectQueryLanguage
- 159. Retained Size Graphs
- 162. Can you put a few debugging “sysouts” into that running app not he server?
- 163. BTrace Tracing Origins DTrace on Sun Solaris Ported to other UNIX platforms Now available as BTrace for Java
- 164. BTrace Tracing Production-time Operates on deployed code Runtime injection of tracing statements Ken Sipe, contributing
- 165. BTrace Tracing Code Tracing written in Java. Doesn’t have to be compiled.
- 166. BTrace Tracing Console It’s core strength. Original target.
- 167. BTrace Tracing GUI Tightly integrated with VisualVM
- 168. BTrace in action
- 169. Omniscient Debuggers
- 171. WebServiceCentric
- 172. Java Network Web Service OSS Debug Tools Filesystem JavaScript
- 174. SOAPUI Purpose ‣ Test, mock, and visualize web services.
- 175. SOAPUI Useful for ‣ Testing your app against a stub web service. ‣ Testing a public web service via a GUI.
- 176. SOAPUI in action
- 177. JavaScriptCentric
- 178. Java Network Web Service OSS Debug Tools Filesystem JavaScript
- 180. FireBug Purpose Visually inspect an entire HTML DOM. Useful for Testing HTML and CSS changes. Making realtime changes to the DOM. Monitoring network traffic. Debuging JavaScript.
- 181. FireBug in action
- 182. FireBug in action
- 183. FireBug in action
- 184. FilesystemCentric
- 185. Java Network Web Service OSS Debug Tools Filesystem JavaScript
- 186. fs_usage
- 187. fs_usage (Mac, Linux) Purpose Shows file activity. Useful for Examining which files are being written. Discovering what component is disk bound.
- 188. fs_usage params er e lt m fi na fo d an in e/ m m od Co M fs_usage -f filesys java
- 189. lsof
- 190. lsof (Mac, Linux) Purpose Shows open files. Useful for Finding what PID is holding a file open.
- 191. lsof params Find all files lsof o pen
- 192. lsof params Find hing eryt as ev r ID h be t his P m ag pen nu o fl D D PI PI lsof -p 4347
- 193. lsof (Mac, Linux) Purpose #2 Shows open network ports and PIDs. Useful for Finding what PID is holding a port open.
- 194. lsof params W ait! thou ght I you said files?
- 195. lsof params ol oc ot rt Po Pr lsof -iTCP:8080
- 197. ProcessMonitor (windows) Purpose Shows open files. Enumerates network TCP handles. Shows registry read/writes. Useful for Discovering network and disk activity causes.
- 199. An open source alternative
- 201. What Else?
- 202. Source Code search engines for examples
- 206. ‣ http://google.com/codesearch ‣ http://www.jexamples.com/ ‣ http://www.codefetch.com/ ‣ http://www.krugle.com/ ‣ http://codesearch.developer.emc.com/ ‣ http://www.codase.com/ ‣ http://www.koders.com/
- 209. Twitter @matthewmccull Matthew Blog http://www.ambientideas.com/blog sidebar has all my social media links Email [email protected] GitHub http://github.com/matthewmccullough
- 211. Resources Apache JMeter http://jakarta.apache.org/jmeter/ JMeter Groovy Plugin http://code.google.com/p/jmeter-groovy-sampler/
- 212. Resources VisualVM https://visualvm.dev.java.net/ GCHisto https://gchisto.dev.java.net/ Eclipse Memory Analyzer http://www.eclipse.org/mat/ BTrace https://btrace.dev.java.net/ DTrace, XRay, Instruments http://en.wikipedia.org/wiki/DTrace
- 214. Image Credits ‣ http://www.ambientideasphotography.com ‣ http://upload.wikimedia.org/wikipedia/commons/a/a4/ BernardMadoff.jpg ‣ http://flickr.com/photos/triller/2226679393/ ‣ http://flickr.com/photos/ektogamat/2687444500/ ‣ http://flickr.com/photos/bfionline/2380398799/ ‣ http://flickr.com/photos/symphoney/76513801/ ‣ http://flickr.com/photos/foxypar4/2124673642/ ‣ http://flickr.com/photos/morberg/3146874095/ ‣ http://flickr.com/photos/triller/2226679393/