Rethrowing exceptions in Java without losing the stack trace

Question

In C   I can use the throw  statement to rethrow an exception while preserving the stack trace   try            catch  Exception e       if  e is FooException       throw      Is there something like this in Java  that doesn t lose the original stack trace

User · Answer

In Java  you just throw the exception you caught  so throw e rather than just throw  Java maintains the stack trace

User · Answer

catch  WhateverException e        throw e      will simply rethrow the exception you ve caught  obviously the surrounding method has to permit this via its signature etc    The exception will maintain the original stack trace

User · Answer

I would prefer   try             catch  FooException fe      throw fe    catch  Exception e           Note  don t catch all exceptions like this unless you know what you        are doing

User · Answer

something like this  try            catch  FooException e       throw e    catch  Exception e

User · Answer

I was just having a similar situation in which my code potentially throws a number of different exceptions that I just wanted to rethrow  The solution described above was not working for me  because Eclipse told me that throw e  leads to an unhandeled exception  so I just did this   try         catch  NoSuchMethodException   SecurityException   IllegalAccessException e                            throw new RuntimeException e getClass   getName            e getMessage       n    e getStackTrace   toString         Worked for me

User · Answer

You can also wrap the exception in another one AND keep the original stack trace by passing in the Exception as a Throwable as the cause parameter   try            catch  Exception e         throw new YourOwnException e

User · Answer

In Java is almost the same   try            catch  Exception e       if  e instanceof FooException       throw e

User · Answer

public int read byte   a  throws IOException       try           return in read a         catch  final Throwable t               can do something here  like  in null              throw t            This is a concrete example where the method throws an IOException  The final means t can only hold an exception thrown from the try block  Additional reading material can be found here and here

User · Answer

Stack trace is prserved if you wrap the catched excetion into an other exception  to provide more info  or if you just rethrow the catched excetion   try           catch  FooException e        throw new BarException  Some usefull info   e

[java] Rethrowing exceptions in Java without losing the stack trace

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