{"id":115123,"date":"2022-10-23T15:15:00","date_gmt":"2022-10-23T12:15:00","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=115123"},"modified":"2022-10-20T12:37:54","modified_gmt":"2022-10-20T09:37:54","slug":"simulating-troubleshooting-stackoverflowerror-in-scala","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2022\/10\/simulating-troubleshooting-stackoverflowerror-in-scala.html","title":{"rendered":"Simulating & troubleshooting StackOverflowError in Scala"},"content":{"rendered":"

In this series<\/a> of simulating and troubleshooting performance problems in Scala, let\u2019s discuss how to simulate StackOverflowError. StackOverflowError is a runtime error, which is thrown, when a thread\u2019s stack size exceeds its allocated memory limit. <\/p>\n

Sample Program<\/h2>\n

Here is a sample Scala program, which generates the StackOverflowError:<\/p>\n

\n
package com.yc\nclass StackOverflowApp {\n}\nobject StackOverflowApp {\n   def main(args: Array[String]): Unit = {\n       System.out.println(\"hit enter to start the StackOverflowApp\")\n       System.in.read()\n       start()\n   }\n   def start(): Unit = {\n     another()\n   }\n   def another(): Unit = {\n     start()\n   }\n}<\/pre>\n<\/div>\n
You can notice the sample program contains the \u2018StackOverflowApp<\/em>\u2019 class. This program does the following:<\/p>\n
    \n
  1. \u2018main()\u2019<\/em> method of this class invokes \u2018start()\u2019<\/em> method <\/li>\n
  2. \u2018start()\u2019<\/em> method invokes \u2018another()\u2019<\/em> method<\/li>\n
  3. \u2018another()\u2019<\/em> method invokes \u2018start()\u2019<\/em> method once again <\/li>\n<\/ol>\n
    Thus \u2018start()\u2019<\/em> and \u2018another()\u2019<\/em> methods (i.e. #b and #c) call each other recursively for an infinite number of times. <\/p>\n
    As per the implementation, the start()<\/em> method and the another()<\/em> method will be added to the thread\u2019s stack frame an infinite number of times. Thus, after a few thousand iterations, the thread\u2019s stack size limit would be exceeded. Once the stack size limit is exceeded it will result in \u2018StackOverflowError<\/em>\u2019.<\/p>\n
    Execution<\/h2>\n
    When we executed above program, as expected \u2018java.lang.StackOverflowError<\/em>\u2019 was thrown in seconds:<\/p>\n
    \n
    java.lang.StackOverflowError\n        at com.yc.StackOverflowApp$.another(StackOverflowApp.scala:19)\n        at com.yc.StackOverflowApp$.start(StackOverflowApp.scala:15)\n        at com.yc.StackOverflowApp$.another(StackOverflowApp.scala:19)\n        at com.yc.StackOverflowApp$.start(StackOverflowApp.scala:15)\n        at com.yc.StackOverflowApp$.another(StackOverflowApp.scala:19)\n        at com.yc.StackOverflowApp$.start(StackOverflowApp.scala:15)\n        at com.yc.StackOverflowApp$.another(StackOverflowApp.scala:19)\n        at com.yc.StackOverflowApp$.start(StackOverflowApp.scala:15)\n        at com.yc.StackOverflowApp$.another(StackOverflowApp.scala:19)\n        at com.yc.StackOverflowApp$.start(StackOverflowApp.scala:15)\n        at com.yc.StackOverflowApp$.another(StackOverflowApp.scala:19)\n        at com.yc.StackOverflowApp$.start(StackOverflowApp.scala:15)\n        at com.yc.StackOverflowApp$.another(StackOverflowApp.scala:19)\n        at com.yc.StackOverflowApp$.start(StackOverflowApp.scala:15)\n        at com.yc.StackOverflowApp$.another(StackOverflowApp.scala:19)\n        at com.yc.StackOverflowApp$.start(StackOverflowApp.scala:15)\n        at com.yc.StackOverflowApp$.another(StackOverflowApp.scala:19)\n        :\n        :<\/pre>\n<\/div>\n
    How to diagnose \u2018java.lang.StackOverflowError\u2019?<\/h2>\n
    You can diagnose StackOverflowError either through a manual or automated approach. 
     
    <\/div> <\/div><\/p>\n
    Manual approach<\/h2>\n
    When an application experiences \u2018StackOverflowError\u2019 it will be either printed in the application log file or in a standard error stream. From the stacktrace you will be able to figure which line of code causing the infinite looping.<\/p>\n
    Automated approach<\/h2>\n
    On the other hand, you can also use yCrash open source script<\/a>, which would capture 360-degree data (GC log, 3 snapshots of thread dump, heap dump, netstat, iostat, vmstat, top, top -H,\u2026) from your application stack within a minute and generate a bundle zip file. You can then either manually analyze these artifacts or upload it to yCrash server for automated analysis. <\/p>\n
    We used the Automated approach. Once the captured artifacts were uploaded to the yCrash server, it instantly generated the below root cause analysis report highlighting the source of the problem. <\/p>\n
    \n
    \"\"<\/a>
    Fig: yCrash<\/a> highlighting thread may result in StackOverflowError<\/em><\/strong><\/figcaption><\/figure>\n<\/div>\n
    \n
    \"\"<\/a>
    Fig: yCrash<\/a> showing the stack trace of the thread causing StackOverFlowError<\/em><\/strong><\/figcaption><\/figure>\n<\/div>\n
    You can notice the yCrash tool precisely pointing out the thread stack length is greater than 400 lines and it has potential to generate StackOverflowError. The Tool also points out the stack trace of the thread which is going on an infinite loop.\u00a0<\/p>\n
    Using this information from the report, one can easily go ahead and fix the StackOverflowError.<\/p>\n
    \n\n\n\n
    \n
    Published on Java Code Geeks with permission by Ram Lakshmanan, partner at our JCG program<\/a>. See the original article here: Simulating & troubleshooting StackOverflowError in Scala<\/a><\/p>\n
    Opinions expressed by Java Code Geeks contributors are their own.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
    In this series of simulating and troubleshooting performance problems in Scala, let\u2019s discuss how to simulate StackOverflowError. StackOverflowError is a runtime error, which is thrown, when a thread\u2019s stack size exceeds its allocated memory limit.  Sample Program Here is a sample Scala program, which generates the StackOverflowError: package com.yc class StackOverflowApp { } object StackOverflowApp …<\/p>\n","protected":false},"author":101536,"featured_media":227,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[],"class_list":["post-115123","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-scala"],"yoast_head":"\nSimulating & troubleshooting StackOverflowError in Scala - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Interested to learn about StackOverflowError? 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