Contents

# NativeException wrapper that prints the full nested stack trace of the Java
# exception and all of its causes wrapped by the NativeException.
# NativeException by default reveals only the first cause, which is
# insufficient for tracing cascading.jruby errors into JRuby code or revealing
# underlying Janino expression problems.
module Cascading
  class CascadingException < StandardError
    def initialize(native_exception, message)
      @ne = native_exception
      super("#{message}\n#{trace_causes(@ne, 1)}")
    end

    def cause(depth)
      fetch_cause(@ne, depth)
    end

    private

    def fetch_cause(ne, depth)
      return ne if depth <= 1
      fetch_cause(ne.cause, depth - 1)
    end

    def trace_causes(ne, depth)
      return unless ne
      trace = "Cause #{depth}: #{ne.respond_to?(:java_class) ? ne.java_class : ne.class}: #{ne}\n"
      if ne.respond_to?(:stack_trace)
        trace += "#{ne.stack_trace.map{ |e| "  at #{e.class_name}.#{e.method_name}(#{e.file_name}:#{e.line_number})" }.join("\n")}\n"
      elsif ne.respond_to?(:backtrace)
        trace += "  #{ne.backtrace.join("\n  ")}\n"
      end
      trace += "#{trace_causes(ne.cause, depth + 1)}"
    end
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
cascading.jruby-0.0.6	lib/cascading/cascading_exception.rb
cascading.jruby-0.0.5	lib/cascading/cascading_exception.rb