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diff --git a/jni/ruby/lib/rubygems/exceptions.rb b/jni/ruby/lib/rubygems/exceptions.rb
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+# TODO: the documentation in here is terrible.
+#
+# Each exception needs a brief description and the scenarios where it is
+# likely to be raised
+
+##
+# Base exception class for RubyGems.  All exception raised by RubyGems are a
+# subclass of this one.
+class Gem::Exception < RuntimeError
+
+  ##
+  #--
+  # TODO: remove in RubyGems 3, nobody sets this
+
+  attr_accessor :source_exception # :nodoc:
+
+end
+
+class Gem::CommandLineError < Gem::Exception; end
+
+class Gem::DependencyError < Gem::Exception; end
+
+class Gem::DependencyRemovalException < Gem::Exception; end
+
+##
+# Raised by Gem::Resolver when a Gem::Dependency::Conflict reaches the
+# toplevel.  Indicates which dependencies were incompatible through #conflict
+# and #conflicting_dependencies
+
+class Gem::DependencyResolutionError < Gem::DependencyError
+
+  attr_reader :conflict
+
+  def initialize conflict
+    @conflict = conflict
+    a, b = conflicting_dependencies
+
+    super "conflicting dependencies #{a} and #{b}\n#{@conflict.explanation}"
+  end
+
+  def conflicting_dependencies
+    @conflict.conflicting_dependencies
+  end
+
+end
+
+##
+# Raised when attempting to uninstall a gem that isn't in GEM_HOME.
+
+class Gem::GemNotInHomeException < Gem::Exception
+  attr_accessor :spec
+end
+
+class Gem::DocumentError < Gem::Exception; end
+
+##
+# Potentially raised when a specification is validated.
+class Gem::EndOfYAMLException < Gem::Exception; end
+
+##
+# Signals that a file permission error is preventing the user from
+# operating on the given directory.
+
+class Gem::FilePermissionError < Gem::Exception
+
+  attr_reader :directory
+
+  def initialize directory
+    @directory = directory
+
+    super "You don't have write permissions for the #{directory} directory."
+  end
+
+end
+
+##
+# Used to raise parsing and loading errors
+class Gem::FormatException < Gem::Exception
+  attr_accessor :file_path
+end
+
+class Gem::GemNotFoundException < Gem::Exception; end
+
+##
+# Raised by the DependencyInstaller when a specific gem cannot be found
+
+class Gem::SpecificGemNotFoundException < Gem::GemNotFoundException
+
+  ##
+  # Creates a new SpecificGemNotFoundException for a gem with the given +name+
+  # and +version+.  Any +errors+ encountered when attempting to find the gem
+  # are also stored.
+
+  def initialize(name, version, errors=nil)
+    super "Could not find a valid gem '#{name}' (#{version}) locally or in a repository"
+
+    @name = name
+    @version = version
+    @errors = errors
+  end
+
+  ##
+  # The name of the gem that could not be found.
+
+  attr_reader :name
+
+  ##
+  # The version of the gem that could not be found.
+
+  attr_reader :version
+
+  ##
+  # Errors encountered attempting to find the gem.
+
+  attr_reader :errors
+
+end
+
+##
+# Raised by Gem::Resolver when dependencies conflict and create the
+# inability to find a valid possible spec for a request.
+
+class Gem::ImpossibleDependenciesError < Gem::Exception
+
+  attr_reader :conflicts
+  attr_reader :request
+
+  def initialize request, conflicts
+    @request   = request
+    @conflicts = conflicts
+
+    super build_message
+  end
+
+  def build_message # :nodoc:
+    requester  = @request.requester
+    requester  = requester ? requester.spec.full_name : 'The user'
+    dependency = @request.dependency
+
+    message = "#{requester} requires #{dependency} but it conflicted:\n"
+
+    @conflicts.each do |_, conflict|
+      message << conflict.explanation
+    end
+
+    message
+  end
+
+  def dependency
+    @request.dependency
+  end
+
+end
+
+class Gem::InstallError < Gem::Exception; end
+
+##
+# Potentially raised when a specification is validated.
+class Gem::InvalidSpecificationException < Gem::Exception; end
+
+class Gem::OperationNotSupportedError < Gem::Exception; end
+
+##
+# Signals that a remote operation cannot be conducted, probably due to not
+# being connected (or just not finding host).
+#--
+# TODO: create a method that tests connection to the preferred gems server.
+# All code dealing with remote operations will want this.  Failure in that
+# method should raise this error.
+class Gem::RemoteError < Gem::Exception; end
+
+class Gem::RemoteInstallationCancelled < Gem::Exception; end
+
+class Gem::RemoteInstallationSkipped < Gem::Exception; end
+
+##
+# Represents an error communicating via HTTP.
+class Gem::RemoteSourceException < Gem::Exception; end
+
+##
+# Raised when a gem dependencies file specifies a ruby version that does not
+# match the current version.
+
+class Gem::RubyVersionMismatch < Gem::Exception; end
+
+##
+# Raised by Gem::Validator when something is not right in a gem.
+
+class Gem::VerificationError < Gem::Exception; end
+
+##
+# Raised to indicate that a system exit should occur with the specified
+# exit_code
+
+class Gem::SystemExitException < SystemExit
+
+  ##
+  # The exit code for the process
+
+  attr_accessor :exit_code
+
+  ##
+  # Creates a new SystemExitException with the given +exit_code+
+
+  def initialize(exit_code)
+    @exit_code = exit_code
+
+    super "Exiting RubyGems with exit_code #{exit_code}"
+  end
+
+end
+
+##
+# Raised by Resolver when a dependency requests a gem for which
+# there is no spec.
+
+class Gem::UnsatisfiableDependencyError < Gem::DependencyError
+
+  ##
+  # The unsatisfiable dependency.  This is a
+  # Gem::Resolver::DependencyRequest, not a Gem::Dependency
+
+  attr_reader :dependency
+
+  ##
+  # Errors encountered which may have contributed to this exception
+
+  attr_accessor :errors
+
+  ##
+  # Creates a new UnsatisfiableDependencyError for the unsatisfiable
+  # Gem::Resolver::DependencyRequest +dep+
+
+  def initialize dep, platform_mismatch=nil
+    if platform_mismatch and !platform_mismatch.empty?
+      plats = platform_mismatch.map { |x| x.platform.to_s }.sort.uniq
+      super "Unable to resolve dependency: No match for '#{dep}' on this platform. Found: #{plats.join(', ')}"
+    else
+      if dep.explicit?
+        super "Unable to resolve dependency: user requested '#{dep}'"
+      else
+        super "Unable to resolve dependency: '#{dep.request_context}' requires '#{dep}'"
+      end
+    end
+
+    @dependency = dep
+    @errors     = []
+  end
+
+  ##
+  # The name of the unresolved dependency
+
+  def name
+    @dependency.name
+  end
+
+  ##
+  # The Requirement of the unresolved dependency (not Version).
+
+  def version
+    @dependency.requirement
+  end
+
+end
+
+##
+# Backwards compatible typo'd exception class for early RubyGems 2.0.x
+
+Gem::UnsatisfiableDepedencyError = Gem::UnsatisfiableDependencyError # :nodoc:
+