Rethrowing exceptions in Java without losing the stack trace

ripper234_11236 0
Viewed 318207

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)?

exception java
9 Answers
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.

Brian_Agnew_129600

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_174730

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_390620

In Java is almost the same:

try
{
   ...
}
catch (Exception e)
{
   if (e instanceof FooException)
     throw e;
}
alves_29450

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

user_831090

something like this

try 
{
  ...
}
catch (FooException e) 
{
  throw e;
}
catch (Exception e)
{
  ...
}
Admin1

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_54497450
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