Convert Ruby Exceptions to Java

Ruby JRuby
1

Is anyone aware of a convenient way to convert Ruby exceptions into Java
Throwable? I am trying to use an slf4j logger to log Ruby errors.

Thanks,
Ariel V.
e-mail: [email protected]
website: http://blog.arielvalentin.com
skype: ariel.s.valentin
twitter: arielvalentin
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2

when Ruby exception bubble into Java they are wrapped in instances of
RaiseException, a subclass of RuntimeException. The constructor of
RaiseException takes a RubyException so they should do the job:

T#

On Mon, Aug 4, 2014 at 3:40 PM, Ariel V. [email protected]

3

The code is still executing in the Ruby context. e.g.

Ariel V.
e-mail: [email protected]
website: http://blog.arielvalentin.com
skype: ariel.s.valentin
twitter: arielvalentin
linkedin: Sign Up | LinkedIn

*simplicity *communication
*feedback *courage *respect

4

It occurred to me that Ruby loggers don’t have the same error printing
features of SLF4J, so I think I am heading the route of using a utility
method to do that and just use error(String) for both cases.

Thanks,
Ariel

Sent from my mobile device. Please excuse any errors.

5

you can still emulate ~ wrapping … if you’ve looked at the linked
RaiseException.java there’s a constructor that takes a RubyException :

begin
raise “error”
rescue => e
t = org.jruby.exceptions.RaiseException.new(e)
logger.error(“This doesn’t … but will !”, t)
end

although this might not be ideal, I would consider adding a “Ruby”
logging
method (on each level) to the logger’s class that would format errors
with
their back-traces

K.

On Tue, Aug 5, 2014 at 5:20 AM, Ariel V. [email protected]

6

btw. if you haven’t already written all your slf4j-integration code I
built
a Ruby Logger to SLF4J bridge a few months ago:

it doesn’t have any exception logging feature though, since, as you say,
Ruby’s Logger doesn’t have it. Maybe it wouldn’t be a bad feature to
pass
Ruby exceptions to SLF4J if you pass an exception object instead of a
string as message.

T#

On Tue, Aug 5, 2014 at 12:37 PM, Ariel V.
[email protected]

7

You can also check out log4jruby (GitHub - lenny/log4jruby: Ruby Logger interface for log4j. Use log4j directly from JRuby. Configure logging for your ruby classes with your java.).
We’ve been using it in production for quite some time now for our
Rails/Warbler/Tomcat apps.

-lenny

8

Thanks all! I will look into these options.

Thanks,
Ariel

Sent from my mobile device. Please excuse any errors.