How do you deal with StackOverflowError in java ?

By -
Problem statement: what is StackOverflowError and how do you deal with this ?
  • Constructor of StackOverflowError class:
  1. StackOverflowError():creates an object of StackOverflowError class, with no details message.
  2. StackOverflowError(String s):creates an object of StackOverflowError class, with the specified detail message.
  • Hierarchies of StackOverflowError class: 
  1. StackOverflowError extends VirtualMachineError: it indicates JVM is broken
  2. VirtualMachineError extends Error: it indicates serious problem that an application should not catch.
  3. Error extends Throwable and furthermore Throwable extends Object.
  • What is StackOverflowError: Stack overflow means exactly - a stack overflows. Usually there's a one stack in the program that contains local-scope variables and addresses where to return when execution of a programs ends. That stack tends to be a fixed memory range somewhere in the memory, therefore it's limited how much it can contain values.
  • If the stack is empty you can't pop, if you do you'll get stack underflow error.
  • If the stack is full you can't push, if you do you'll get stack overflow error.
  • So stack overflow appears where you allocate too much into the stack.
  • what is the cause of StackOverflowError ?
  1. when recursive function does not have the correct termination condition, then it ends up calling itself forever and leads to StackOverflowError.
  2. If you are calling library function that indirectly cause function to be called.
  • How do you deal with StackOverflowError?
  1. Inspect the stack trace and detect the repeating pattern of line numbers. 
  2. these line numbers indicates code being recursively called.
  3. once you detect these lines, inspect your code and understand why recursion never terminates.
  4. if code is terminating the recursion correctly, then increase the thread stack's size, in order to allow large number of invocations.
  5. default thread stack size is equal to 1MB.
  6. thread stack size can be increase using -Xss flag
  7. -Xss flag can be specified either via project's configuration, or via command line.
  8. value can be set like -Xss2048k or -Xss2M don't use = operator like -Xss=2048k
  1. public class StackOverFlowErrorExe {
  2. public static void recursiveCall(int num) {

  4. System.out.println("Number: " + num);

  6. if (num == 0) {
  7. return;
  8. }else {
  9. recursiveCall(++num);
  10. }
  11. }

  13. public static void main(String[] args) {
  14. StackOverFlowErrorExe.recursiveCall(1);
  15. }
  16. }
Output: Exception in thread "main" java.lang.StackOverflowError.
  • How to configure -Xss flag in eclipse:


Comments

Post a Comment

Popular posts from this blog

Today Walkin 14th-Sept

By -
Image
14th Sept 2017 ( GO Through all List) Read Walkin details properly , Try to call company before attending if possible !!! ==================================== 1. Myntra through fresherworld (Call Based , Venue shared to shortlisted candidates) _____________________________ 2. Magna : Hiring for Client Harman : C++
Read more

Spring Elasticsearch Operations

By -
Elasticsearch Operations Spring Data Elasticsearch uses two interfaces to define the operations that can be called against an Elasticsearch index. These are ElasticsearchOperations and ReactiveElasticsearchOperations. Whereas the first is used with the classic synchronous implementations, the second one uses reactive infrastructure. The default implementations of the interfaces offer: Read/Write mapping support for domain types. A rich query and criteria api. Resource management and Exception translation. ElasticsearchTemplate The ElasticsearchTemplate is an implementation of the ElasticsearchOperations interface using the Transport Client. @Configuration public class TransportClientConfig extends ElasticsearchConfigurationSupport {   @Bean   public Client elasticsearchClient() throws UnknownHostException {                      Settings settings = Settings.builder().put("cluster.name", "elasticsearch")....
Read more

Hibernate Search - Elasticsearch with JSON manipulation

By -
Elasticsearch with JSON manipulation Elasticsearch ships with many features. It is possible that at some point, one feature you need will not be exposed by the Search DSL. To work around such limitations, Hibernate Search provides ways to: Transform the HTTP request sent to Elasticsearch for search queries. Read the raw JSON of the HTTP response received from Elasticsearch for search queries. Direct changes to the HTTP request may conflict with Hibernate Search features and be supported differently by different versions of Elasticsearch. Similarly, the content of the HTTP response may change depending on the version of Elasticsearch, depending on which Hibernate Search features are used, and even depending on how Hibernate Search features are implemented. Thus, features relying on direct access to HTTP requests or responses cannot be guaranteed to continue to work when upgrading Hibernate Search, even for micro upgrades (x.y.z to x.y.(z+1)). Use this at your own risk....
Read more