java - Alternates for System.exit that could send error codes to batch or shell -

i have set of error codes in java application. i'm using system.exit(code); return error codes application external applications. there alternatives of system.exit using bad practice because may shutdown entire jvm.

i have shared experience in past, , tried engineer out system.exit(). 1 possibility leave runtimeexception uncaught , return 1 shell, if want more versatility (and don't want ugly stack-trace polluting output), must have @ least "one" call system.exit().

public class splat {      public static void main(string[] args) {          if (args.length > 0 && "splat".equals(args[0]))             throw new runtimeexception("splat");     } } 

output:

 $ java splat  $ echo $?  > 0  $ java splat splat  > exception in thread "main" java.lang.runtimeexception: splat  >         @ splat.main(splat.java:9)  $ echo $?  > 1 

my reason doing our organisation started using static analysis results sonar kpi , job numbers down. it's terrible reason doing anything, interesting engineering challenge nonetheless ....

an approach tried throwing specific class of runtimeexception, exit-code instance variable, , catching @ outer scope. way can sure when murder vm you're @ tail of stack anyway ...

public class splat {      public static final class exit extends runtimeexception {          private int exitcode;          public exit(int exitcode) {             this.exitcode = exitcode;         }     }      public static void main(string[] args) {          try {              wrappedmain(args);          } catch (exit e) {              system.exit(e.exitcode);         }     }      public static void wrappedmain(string[] args) {          if (args.length > 0 && "splat".equals(args[0])) {              int code = (args.length > 1) ? integer.parseint(args[1]) : 0;              throw new exit(code);         }     } } 

output:

 $ java splat  $ java splat splat  $ echo $?  > 0  $ java splat splat 1  $ echo $?  > 1  > $ java splat splat 2  $ echo $?  > 2  $ java splat splat -1  $ echo $?  > 127 

there caveats approach of course! bit of odd way exit , unfamiliar constraints scratch head. also, if catch (throwable t) later on, wont able exit!!! if working in static analysis ci environment should highlighted more grievous violation!