[Lift] Re: JSON stack overflow issue
I've been running with this for a day or so and it seems to work fine now (no mo' stack overflows). Thanks, David, for the quick fix! -- Paul O'Rorke http://ororke.com/paul/blog http://linkedin.com/in/paulororke On Feb 16, 2009, at 8:42 AM PST, David Pollak wrote: Folks, The problem was in Scala's rep1sep parser method. It grows stack, about 20 frames per element, and thus bad things happen around 200 elements. I replaced the code with a while loop. Less elegant on the page, more elegant in execution. Thanks, David On Mon, Feb 16, 2009 at 7:38 AM, David Pollak feeder.of.the.be...@gmail.com wrote: Okay... I've issolated the problem. Lots of GC items being sent. This is causing a stack overflow. I've got a test for it and I'll fix the problem today. On Mon, Feb 16, 2009 at 1:33 AM, Tim Perrett he...@timperrett.com wrote: In wireshark you'll be looking to use a normal HTTP rule as the JSON will just be passed as entity body in the request. Doing a filter for HTTP port 80 should be sufficient. Cheers Tim -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Git some: http://github.com/dpp -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Git some: http://github.com/dpp --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: JSON stack overflow issue
In wireshark you'll be looking to use a normal HTTP rule as the JSON will just be passed as entity body in the request. Doing a filter for HTTP port 80 should be sufficient. Cheers Tim --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: JSON stack overflow issue
Okay... I've issolated the problem. Lots of GC items being sent. This is causing a stack overflow. I've got a test for it and I'll fix the problem today. On Mon, Feb 16, 2009 at 1:33 AM, Tim Perrett he...@timperrett.com wrote: In wireshark you'll be looking to use a normal HTTP rule as the JSON will just be passed as entity body in the request. Doing a filter for HTTP port 80 should be sufficient. Cheers Tim -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Git some: http://github.com/dpp --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: JSON stack overflow issue
Hi, David: I'm not using JSON directly myself and when I do a search on json it only shows up on one line in the default.html page: script id=json src=/classpath/json.js type=text/javascript/ Perhaps it is JSON that is being used under the hood? I am using CRUDIFY and the menu items for add, delete, and list operations and the associated pages. I'm also using some ajax checkboxes and textboxes like the ones in lift workshop examples (specifically: the todo example). By the way, the app still seems to work, it just tends to slow down after a while. On Feb 15, 4:01 pm, David Pollak feeder.of.the.be...@gmail.com wrote: Paul, Please provide a sample of the JSON that caused the stack overflow. Thanks, David On Sun, Feb 15, 2009 at 1:24 PM, Paul O'Rorke p...@ororke.com wrote: Something odd has started to happen in the last day or two: I am starting to get stackoverflows in a small app that I use. I have not changed my classes for a week or so and use the app daily. It has been working ok up until today or last night. This seems to happen as soon as it starts up before I even start to use it. I am using Scala 2.7.3 and the following lift version0.11-SNAPSHOT/version [INFO] Starting jetty 6.1.15.rc2 ... 2009-02-15 13:03:37.799::INFO: jetty-6.1.15.rc2 2009-02-15 13:03:37.994::INFO: No Transaction manager found - if your webapp requires one, please configure one. 2009-02-15 13:03:40.506::INFO: Started selectchannelconnec...@0.0.0.0:8080 [INFO] Started Jetty Server [INFO] Starting scanner at interval of 5 seconds. WARN - Request for /ajax_request failed null java.lang.StackOverflowError at net.liftweb.util.JSONParser$$anonfun$string$4$$anonfun$apply$14$ $anonfun$apply$15$$anonfun$apply$16.apply(JSON.scala:46) at net.liftweb.util.JSONParser$$anonfun$string$4$$anonfun$apply$14$ $anonfun$apply$15$$anonfun$apply$16.apply(JSON.scala:46) at scala.util.parsing.combinator.Parsers$$anonfun$not$1.apply (Parsers.scala:703) at scala.util.parsing.combinator.Parsers$$anonfun$not$1.apply (Parsers.scala:702) at scala.util.parsing.combinator.Parsers$$anon$2.apply(Parsers.scala: 188) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$flatMap $1.apply(Parsers.scala:206) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$flatMap $1.apply(Parsers.scala:206) at scala.util.parsing.combinator.Parsers$$anon$2.apply(Parsers.scala: 188) at net.liftweb.util.SafeSeqParser$$anon$1.apply (CombParserHelpers.scala:169) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$append $1.apply(Parsers.scala:214) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$append $1.apply(Parsers.scala:214) at scala.util.parsing.combinator.Parsers$$anon$2.apply(Parsers.scala: 188) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$map$1.apply (Parsers.scala:209) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$map$1.apply (Parsers.scala:209) at scala.util.parsing.combinator.Parsers$$anon$2.apply(Parsers.scala: 188) at scala.util.parsing.combinator.Parsers$$anon$2.apply(Parsers.scala: 188) at scala.util.parsing.combinator.Parsers$Success.flatMapWithNext (Parsers.scala:128) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$flatMap $1.apply(Parsers.scala:206) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$flatMap $1.apply(Parsers.scala:206) at scala.util.parsing.combinator.Parsers$$anon$2.apply(Parsers.scala: 188) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$flatMap $1.apply(Parsers.scala:206) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$flatMap $1.apply(Parsers.scala:206) at scala.util.parsing.combinator.Parsers$$anon$2.apply(Parsers.scala: 188) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$map$1.apply (Parsers.scala:209) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$map$1.apply (Parsers.scala:209) at scala.util.parsing.combinator.Parsers$$anon$2.apply(Parsers.scala: 188) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$append$1$ $anonfun$apply$1.apply(Parsers.scala:214) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$append$1$ $anonfun$apply$1.apply(Parsers.scala:214) at scala.util.parsing.combinator.Parsers$Failure.append(Parsers.scala: 168) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$append $1.apply(Parsers.scala:214) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$append $1.apply(Parsers.scala:214) at scala.util.parsing.combinator.Parsers$$anon$2.apply(Parsers.scala: 188) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$append $1.apply(Parsers.scala:214) at
[Lift] Re: JSON stack overflow issue
Paul, Something is calling JSONParser with a parameter that's causing the stack overflow. You can use Firebug to see what the browser is sending to the server. That's a way to capture the JSON. Wireshark is a way of intercepting the HTTP traffic and you can see what the client is sending to the server. If you can provide me with the String that's causing the JSON parsing failure, I can add it to the test suite and fix the bug. Thanks, David On Sun, Feb 15, 2009 at 5:25 PM, Paul O'Rorke p...@ororke.com wrote: Hi, David: I'm not using JSON directly myself and when I do a search on json it only shows up on one line in the default.html page: script id=json src=/classpath/json.js type=text/javascript/ Perhaps it is JSON that is being used under the hood? I am using CRUDIFY and the menu items for add, delete, and list operations and the associated pages. I'm also using some ajax checkboxes and textboxes like the ones in lift workshop examples (specifically: the todo example). By the way, the app still seems to work, it just tends to slow down after a while. On Feb 15, 4:01 pm, David Pollak feeder.of.the.be...@gmail.com wrote: Paul, Please provide a sample of the JSON that caused the stack overflow. Thanks, David On Sun, Feb 15, 2009 at 1:24 PM, Paul O'Rorke p...@ororke.com wrote: Something odd has started to happen in the last day or two: I am starting to get stackoverflows in a small app that I use. I have not changed my classes for a week or so and use the app daily. It has been working ok up until today or last night. This seems to happen as soon as it starts up before I even start to use it. I am using Scala 2.7.3 and the following lift version0.11-SNAPSHOT/version [INFO] Starting jetty 6.1.15.rc2 ... 2009-02-15 13:03:37.799::INFO: jetty-6.1.15.rc2 2009-02-15 13:03:37.994::INFO: No Transaction manager found - if your webapp requires one, please configure one. 2009-02-15 13:03:40.506::INFO: Started selectchannelconnec...@0.0.0.0:8080 [INFO] Started Jetty Server [INFO] Starting scanner at interval of 5 seconds. WARN - Request for /ajax_request failed null java.lang.StackOverflowError at net.liftweb.util.JSONParser$$anonfun$string$4$$anonfun$apply$14$ $anonfun$apply$15$$anonfun$apply$16.apply(JSON.scala:46) at net.liftweb.util.JSONParser$$anonfun$string$4$$anonfun$apply$14$ $anonfun$apply$15$$anonfun$apply$16.apply(JSON.scala:46) at scala.util.parsing.combinator.Parsers$$anonfun$not$1.apply (Parsers.scala:703) at scala.util.parsing.combinator.Parsers$$anonfun$not$1.apply (Parsers.scala:702) at scala.util.parsing.combinator.Parsers$$anon$2.apply(Parsers.scala: 188) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$flatMap $1.apply(Parsers.scala:206) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$flatMap $1.apply(Parsers.scala:206) at scala.util.parsing.combinator.Parsers$$anon$2.apply(Parsers.scala: 188) at net.liftweb.util.SafeSeqParser$$anon$1.apply (CombParserHelpers.scala:169) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$append $1.apply(Parsers.scala:214) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$append $1.apply(Parsers.scala:214) at scala.util.parsing.combinator.Parsers$$anon$2.apply(Parsers.scala: 188) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$map$1.apply (Parsers.scala:209) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$map$1.apply (Parsers.scala:209) at scala.util.parsing.combinator.Parsers$$anon$2.apply(Parsers.scala: 188) at scala.util.parsing.combinator.Parsers$$anon$2.apply(Parsers.scala: 188) at scala.util.parsing.combinator.Parsers$Success.flatMapWithNext (Parsers.scala:128) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$flatMap $1.apply(Parsers.scala:206) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$flatMap $1.apply(Parsers.scala:206) at scala.util.parsing.combinator.Parsers$$anon$2.apply(Parsers.scala: 188) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$flatMap $1.apply(Parsers.scala:206) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$flatMap $1.apply(Parsers.scala:206) at scala.util.parsing.combinator.Parsers$$anon$2.apply(Parsers.scala: 188) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$map$1.apply (Parsers.scala:209) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$map$1.apply (Parsers.scala:209) at scala.util.parsing.combinator.Parsers$$anon$2.apply(Parsers.scala: 188) at scala.util.parsing.combinator.Parsers$Parser$$anonfun$append$1$
