diff --git a/.rubocop.yml b/.rubocop.yml
index b2f2ed1..85ce27e 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -3,9 +3,17 @@ plugins:
   - rubocop-performance
   - rubocop-minitest
 
+inherit_mode:
+  merge:
+    - Exclude
+
 AllCops:
   TargetRubyVersion: 2.6
   NewCops: enable
+  Exclude:
+    - target/**/*
+    - vendor/**/*
+    - tmp/**/*
 
 Metrics:
   Enabled: false
diff --git a/Gemfile b/Gemfile
index 04be930..4685c72 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ source 'https://gem.coop'
 
 gemspec
 
-group :development do 
+group :development do
   gem 'rake', require: false
   gem 'ruby-debug', '~> 0.11', require: false
 
@@ -13,3 +13,8 @@ group :development do
   gem 'rubocop-performance', require: false
   gem 'rubocop-rake', require: false
 end
+
+group :test do
+  gem 'minitest', '~> 5.27'
+  gem 'minitest-mock', '~> 5.27'
+end
diff --git a/Rakefile b/Rakefile
index bf0ce86..a524882 100644
--- a/Rakefile
+++ b/Rakefile
@@ -48,7 +48,7 @@ task :download_jars do
 
     puts "  downloading #{filename}..."
     URI.open(info[:url]) do |remote| # rubocop:disable Security/Open
-      File.open(target, 'wb') { |f| f.write(remote.read) }
+      File.binwrite(target, remote.read)
     end
     verify_checksum(target, info[:sha1])
     puts "  saved: #{target}"
@@ -60,7 +60,7 @@ def verify_checksum(path, expected_sha1)
   return if actual == expected_sha1
 
   File.delete(path)
-  raise "SHA-1 mismatch for #{path}:\n" \
-        "  expected: #{expected_sha1}\n" \
-        "  actual:   #{actual}"
+  raise "SHA-1 mismatch for #{path}:\n  " \
+        "expected: #{expected_sha1}\n  " \
+        "actual:   #{actual}"
 end
diff --git a/jar-dependencies.gemspec b/jar-dependencies.gemspec
index 9532d7b..73c2afc 100644
--- a/jar-dependencies.gemspec
+++ b/jar-dependencies.gemspec
@@ -1,12 +1,17 @@
 # frozen_string_literal: true
 
-require_relative 'lib/jars/version'
-require_relative 'lib/jars/mima/version'
+File.expand_path('lib', File.dirname(__FILE__)).tap do |lib|
+  $LOAD_PATH.unshift lib unless $LOAD_PATH.include?(lib)
+end
+
+require 'jars/version'
+require 'jars/mima/version'
 
 Gem::Specification.new do |s|
   s.name = 'jar-dependencies'
 
   s.version = Jars::VERSION
+  s.platform = 'java'
 
   s.author = 'christian meier'
   s.email = ['mkristian@web.de']
@@ -20,7 +25,7 @@ Gem::Specification.new do |s|
 
   s.files = Dir['{lib}/**/*'] + %w[Mavenfile Rakefile Readme.md jar-dependencies.gemspec MIT-LICENSE]
   # explicitly require the jars
-  s.files += Jars::Mima::JARS.each_key.map {File.join(Jars::Mima::MIMA_DIR, _1)}
+  s.files += Jars::Mima::JARS.each_key.map { File.join(Jars::Mima::MIMA_DIR, _1) }
 
   s.description = <<~TEXT
     manage jar dependencies for gems and keep track which jar was already
@@ -32,7 +37,5 @@ Gem::Specification.new do |s|
 
   s.required_ruby_version = '>= 2.6'
 
-  s.add_development_dependency 'minitest', '~> 5.10'
-
   s.metadata['rubygems_mfa_required'] = 'true'
 end
diff --git a/lib/jar_dependencies.rb b/lib/jar_dependencies.rb
index f8cc5fa..61a7dbd 100644
--- a/lib/jar_dependencies.rb
+++ b/lib/jar_dependencies.rb
@@ -55,8 +55,9 @@ module Jars
   autoload :MavenSettings, 'jars/maven_settings'
   autoload :Mima, 'jars/mima'
 
-  @jars_lock = false
   @jars = {}
+  @jars_lock = false
+  @jars_locked = nil
 
   class JarLoadError < LoadError; end
 
@@ -119,10 +120,15 @@ def quiet?
       @quiet
     end
 
+    # @deprecated
     def no_more_warnings
       @quiet = true
     end
 
+    def locked_jar?(coordinate)
+      @jars_locked&.include?(coordinate)
+    end
+
     def jarfile
       ENV['JARFILE'] || ENV_JAVA['jarfile'] || ENV['JBUNDLER_JARFILE'] || ENV_JAVA['jbundler.jarfile'] || 'Jarfile'
     end
@@ -177,6 +183,7 @@ def reset
       end
       Jars::MavenSettings.reset
       @jars = {}
+      @jars_locked = nil
     end
 
     def maven_local_settings
@@ -209,6 +216,7 @@ def home
 
     def require_jars_lock!(scope = :runtime)
       urls = jars_lock_from_class_loader if to_prop(LOCK).nil?
+      pre_lock_jars = @jars.keys.dup
       if urls && !urls.empty?
         @jars_lock = true
 
@@ -223,15 +231,19 @@ def require_jars_lock!(scope = :runtime)
             done << url
           end
         end
-        no_more_warnings
       elsif (jars_lock = Jars.lock_path)
         Jars.debug { "--- load jars from #{jars_lock}" }
         @jars_lock = jars_lock
 
         classpath = Jars::Classpath.new(nil, jars_lock)
         classpath.require(scope)
-        no_more_warnings
       end
+
+      return unless @jars_lock
+
+      @jars_locked = (@jars.keys - pre_lock_jars).freeze
+      return if @jars_locked.empty?
+
       Jars.debug do
         loaded = @jars.collect { |k, v| "#{k}:#{v}" }
         "--- loaded jars ---\n\t#{loaded.join("\n\t")}"
@@ -275,6 +287,13 @@ def require_jar(group_id, artifact_id, *classifier_version)
       end
     end
 
+    def info(msg = nil, newline: true)
+      return if quiet?
+
+      msg = yield if msg.nil? && block_given?
+      Kernel.print("#{msg}#{"\n" if newline}")
+    end
+
     def warn(msg = nil)
       return if quiet? && !debug?
 
@@ -306,9 +325,8 @@ def require_jar_with_block(group_id, artifact_id, *classifier_version)
       version = classifier_version[-1]
       classifier = classifier_version[-2]
 
-      coordinate = +"#{group_id}:#{artifact_id}"
-      coordinate << ":#{classifier}" if classifier
-      if @jars.key? coordinate
+      coordinate = "#{group_id}:#{artifact_id}#{":#{classifier}" if classifier}"
+      if @jars.key?(coordinate)
         if @jars[coordinate] == version
           false
         else
@@ -346,8 +364,8 @@ def to_jar(group_id, artifact_id, version, classifier = nil)
       file
     end
 
-    def do_require(*args)
-      jar = to_jar(*args)
+    def do_require(group_id, artifact_id, version, classifier)
+      jar = to_jar(group_id, artifact_id, version, classifier)
       # use jar from PWD/vendor/jars if exists
       if File.exist?(vendor = File.join(Dir.pwd, 'vendor', 'jars', jar))
         require vendor
@@ -373,15 +391,18 @@ def require_jar(*args, &block)
   return unless Jars.require?
 
   result = Jars.require_jar(*args, &block)
-  if result.is_a? String
+  if result.is_a?(String)
     args << (yield || Jars::UNKNOWN) if args.size == 2 && block
-    Jars.warn do
-      "jar conflict: #{args[0..-2].join(':')} already loaded with version #{result}; " \
-        "skipping requested version #{args[-1]}"
+    coordinate = args[0..-2].join(':')
+    unless Jars.locked_jar?(coordinate)
+      Jars.warn do
+        "jar conflict: #{coordinate} already loaded with version #{result}; " \
+          "skipping requested version #{args[-1]}"
+      end
     end
     Jars.debug("\n\t#{caller.join("\n\t")}") if Jars.debug?
     return false
   end
-  Jars.debug { "jar registration: #{args.inspect}; loaded=#{result == true}" }
+  Jars.debug { "jar registration: #{args.inspect}; loaded=#{result}" }
   result
 end
diff --git a/lib/jars/gemspec_artifacts.rb b/lib/jars/gemspec_artifacts.rb
index 4e84bc0..e3571b3 100644
--- a/lib/jars/gemspec_artifacts.rb
+++ b/lib/jars/gemspec_artifacts.rb
@@ -1,20 +1,14 @@
 # frozen_string_literal: true
 
 module Jars
-  class MavenVersion < String
+  module MavenVersion
     class << self
-      def new(*args)
-        if args.empty? || (args.size == 1 && args[0].nil?)
-          nil
-        else
-          low, high = convert(args[0])
-          low, high = convert(args[1], low, high) if /[=~><]/.match?(args[1])
-          if low == high
-            low
-          else
-            super("#{low || '[0'},#{high || ')'}")
-          end
-        end
+      def resolve(*args)
+        return nil if args.empty? || (args.size == 1 && args[0].nil?)
+
+        low, high = convert(args[0])
+        low, high = convert(args[1], low, high) if /[=~><]/.match?(args[1])
+        (low == high) ? low : "#{low || '[0'},#{high || ')'}"
       end
 
       private
@@ -94,14 +88,19 @@ class Artifact
 
       ALLOWED_TYPES = %w[jar pom].freeze
 
-      def initialize(options, *args)
-        @type, @group_id, @artifact_id, @classifier, @version, @exclusions = *args
+      def initialize(type, group_id, artifact_id, classifier, version, exclusions, **options)
+        @type = type
+        @group_id = group_id
+        @artifact_id = artifact_id
+        @classifier = classifier
+        @version = version
+        @exclusions = exclusions
         options.each do |k, v|
           instance_variable_set(:"@#{k}", v)
         end
       end
 
-      def self.new(line)
+      def self.parse(line)
         line = line.strip
         index = line.index(/\s/)
         return nil if index.nil?
@@ -151,7 +150,7 @@ def self.new(line)
           warn line
           return nil
         end
-        super(options, type, group_id, artifact_id, classifier, version, exclusions)
+        new(type, group_id, artifact_id, classifier, version, exclusions, **options)
       end
 
       def to_s
@@ -169,18 +168,11 @@ def to_gacv
         args.join(':')
       end
 
-      def to_coord_no_classifier
-        args = [@group_id, @artifact_id]
-        args << @type
-        args << MavenVersion.new(@version)
-        args.join(':')
-      end
-
-      def to_coord
+      def to_coord(classifier: true)
         args = [@group_id, @artifact_id]
-        args << @classifier if @classifier
+        args << @classifier if classifier && @classifier
         args << @type
-        args << MavenVersion.new(@version)
+        args << MavenVersion.resolve(@version)
         args.join(':')
       end
 
@@ -197,9 +189,8 @@ def initialize(spec)
       @artifacts = []
       spec.requirements.each do |req|
         req.split("\n").each do |line|
-          if (a = Artifact.new(line))
-            @artifacts << a
-          end
+          artifact = Artifact.parse(line)
+          @artifacts << artifact if artifact
         end
       end
       @artifacts.freeze
diff --git a/lib/jars/installer.rb b/lib/jars/installer.rb
index d51d279..213f628 100644
--- a/lib/jars/installer.rb
+++ b/lib/jars/installer.rb
@@ -6,23 +6,36 @@
 module Jars
   class Installer
     class Dependency
-      attr_reader :path, :file, :gav, :scope, :type, :coord
+      REG = /:jar:|:pom:|:test:|:compile:|:runtime:|:provided:|:system:/.freeze
+      EMPTY = ""
 
-      def self.new(line)
-        super if /:jar:|:pom:/.match?(line)
-      end
+      def self.parse(line)
+        return unless /:jar:|:pom:/.match?(line)
+
+        line = line.dup
+        # remove ANSI escape sequences and module section (https://issues.apache.org/jira/browse/MDEP-974)
+        line.gsub!(/\e\[\d*m/, EMPTY)
+        line.gsub!(/ -- module.*/, EMPTY)
+        line.strip!
 
-      def setup_type(line)
         if line.index(':pom:')
-          @type = :pom
+          type = :pom
         elsif line.index(':jar:')
-          @type = :jar
+          type = :jar
         end
-      end
-      private :setup_type
 
-      def setup_scope(line)
-        @scope =
+        coord = line.sub(/:[^:]+:([A-Z]:\\)?[^:]+$/, EMPTY)
+        first, second = coord.split(/:#{type}:/)
+        group_id, artifact_id = first.split(':')
+        parts = group_id.split('.')
+        parts << artifact_id
+        parts << second.split(':')[-1]
+        file = line.slice(coord.length, line.length).sub(REG, EMPTY).strip
+        last = file.reverse.index(%r{\\|/})
+        parts << line[-last..]
+        path = File.join(parts).strip
+
+        scope =
           case line
           when /:provided:/
             :provided
@@ -31,34 +44,20 @@ def setup_scope(line)
           else
             :runtime
           end
-      end
-      private :setup_scope
 
-      REG = /:jar:|:pom:|:test:|:compile:|:runtime:|:provided:|:system:/.freeze
-      EMPTY = ''
-      def initialize(line)
-        # remove ANSI escape sequences and module section (https://issues.apache.org/jira/browse/MDEP-974)
-        line = line.gsub(/\e\[\d*m/, '')
-        line = line.gsub(/ -- module.*/, '')
-
-        setup_type(line)
-
-        line.strip!
+        new(type, scope, coord, file, path, !line.index(':system:').nil?)
+      end
 
-        @coord = line.sub(/:[^:]+:([A-Z]:\\)?[^:]+$/, EMPTY)
-        first, second = @coord.split(/:#{type}:/)
-        group_id, artifact_id = first.split(':')
-        parts = group_id.split('.')
-        parts << artifact_id
-        parts << second.split(':')[-1]
-        @file = line.slice(@coord.length, line.length).sub(REG, EMPTY).strip
-        last = @file.reverse.index(%r{\\|/})
-        parts << line[-last..]
-        @path = File.join(parts).strip
+      attr_reader :path, :file, :gav, :scope, :type, :coord
 
-        setup_scope(line)
+      def initialize(type, scope, coord, file, path, system)
+        @type = type
+        @scope = scope
+        @coord = coord
+        @file = file
+        @path = path
 
-        @system = !line.index(':system:').nil?
+        @system = system
         @gav = @coord.sub(REG, ':')
       end
 
@@ -74,7 +73,7 @@ def self.install_jars(write_require_file: false)
     def self.load_from_maven(file)
       result = []
       File.read(file).each_line do |line|
-        dep = Dependency.new(line)
+        dep = Dependency.parse(line)
         result << dep if dep && dep.scope == :runtime
       end
       result
@@ -103,12 +102,11 @@ def self.print_require_jar(file, dep, fallback: false)
     end
 
     COMMENT = '# this is a generated file, to avoid over-writing it just delete this comment'
-    def self.needs_to_write?(require_filename)
-      require_filename && (!File.exist?(require_filename) || File.read(require_filename).match(COMMENT))
-    end
 
     def self.write_require_jars(deps, require_filename)
-      return unless needs_to_write?(require_filename)
+      return if !require_filename || (
+        File.exist?(require_filename) && !File.read(require_filename).index(COMMENT)
+      )
 
       FileUtils.mkdir_p(File.dirname(require_filename))
       File.open(require_filename, 'w') do |f|
@@ -175,18 +173,15 @@ def ruby_maven_install_options=(options)
     end
 
     def jars?
-      # first look if there are any requirements in the spec
-      # and then if gem depends on jar-dependencies for runtime.
-      # only then install the jars declared in the requirements
       spec = self.spec
-      result = spec && !spec.requirements.empty? &&
-               spec.dependencies.detect { |d| d.name == 'jar-dependencies' && d.type == :runtime }
-      if result && spec.platform.to_s != 'java'
-        Jars.warn "jar-dependencies found on non-java platform gem; skipping jar installation"
-        false
-      else
-        result
-      end
+      return if spec.nil? # rubocop:disable Style/ReturnNilInPredicateMethodDefinition
+      return false unless spec.requirements&.any?
+      return false unless spec.runtime_dependencies.find { |s| s.name == 'jar-dependencies' }
+
+      return true if spec.platform.to_s == 'java'
+
+      Jars.warn "jar-dependencies found on non-java platform gem; skipping jar installation"
+      nil # rubocop:disable Style/ReturnNilInPredicateMethodDefinition
     end
 
     private
@@ -213,8 +208,9 @@ def do_install(vendor_dir, write_require_file)
     def install_dependencies
       deps = File.join(@mvn.basedir, 'deps.lst')
 
-      puts "  jar dependencies for #{spec.spec_name} . . ." unless Jars.quiet?
+      Jars.info("jar dependencies for #{spec.spec_name} ", newline: false)
       @mvn.resolve_dependencies_list(deps)
+      Jars.info("") # newline after progress dots
 
       self.class.load_from_maven(deps)
     ensure
diff --git a/lib/jars/mima.rb b/lib/jars/mima.rb
index aeb8c34..5cab010 100644
--- a/lib/jars/mima.rb
+++ b/lib/jars/mima.rb
@@ -132,18 +132,22 @@ def aether_repository_listener
           when :metadataInvalid
             Jars.debug { "[mima] invalid metadata #{metadata_label(event.getMetadata)}" }
           when :artifactResolving
+            progress_dot
             Jars.debug { "[mima] resolving artifact #{artifact_label(event.getArtifact)}" }
           when :artifactResolved
             Jars.debug { resolved_message('artifact', event) }
           when :metadataResolving
+            progress_dot
             Jars.debug { "[mima] resolving metadata #{metadata_label(event.getMetadata)}" }
           when :metadataResolved
             Jars.debug { resolved_message('metadata', event) }
           when :artifactDownloading
+            progress_dot
             Jars.debug { download_message('artifact', event) }
           when :artifactDownloaded
             Jars.debug { downloaded_message('artifact', event) }
           when :metadataDownloading
+            progress_dot
             Jars.debug { download_message('metadata', event) }
           when :metadataDownloaded
             Jars.debug { downloaded_message('metadata', event) }
@@ -168,6 +172,11 @@ def aether_transfer_listener
         end
       end
 
+      # Emits a single progress dot (no newline) unless in debug mode
+      def progress_dot
+        Jars.info('.', newline: false) unless Jars.debug?
+      end
+
       def resolved_message(kind, event)
         message = +"[mima] resolved #{kind} #{repository_item_label(event)}"
         message << " -> #{event.getFile.getAbsolutePath}" if event.getFile
@@ -251,7 +260,7 @@ def artifacts_to_dependencies(artifacts, all_dependencies: false)
       # @param artifact [Jars::GemspecArtifacts::Artifact]
       # @return [org.eclipse.aether.artifact.DefaultArtifact]
       def build_aether_artifact(artifact)
-        version = Jars::MavenVersion.new(artifact.version) || artifact.version
+        version = Jars::MavenVersion.resolve(artifact.version) || artifact.version
         if artifact.classifier
           org.eclipse.aether.artifact.DefaultArtifact.new(
             artifact.group_id, artifact.artifact_id, artifact.classifier,
diff --git a/specs/dependency_spec.rb b/specs/dependency_spec.rb
index 9b949f2..32d901d 100644
--- a/specs/dependency_spec.rb
+++ b/specs/dependency_spec.rb
@@ -7,13 +7,13 @@
 # rubocop:disable Layout/LineLength
 describe Jars::Installer::Dependency do
   it 'should parse dependency line only if it is jar or pom' do
-    assert_nil Jars::Installer::Dependency.new(+'something')
-    assert Jars::Installer::Dependency.new(+'   org.apache.maven:maven-repository-metadata:jar:3.1.0:compile:/usr/local/repository/org/apache/maven/maven-repository-metadata/3.1.0/maven-repository-metadata-3.1.0.jar')
-    assert Jars::Installer::Dependency.new(+'   org.apache.maven:maven-repository-metadata:pom:3.1.0:compile:/usr/local/repository/org/apache/maven/maven-repository-metadata/3.1.0/maven-repository-metadata-3.1.0.jar')
+    assert_nil Jars::Installer::Dependency.parse(+'something')
+    assert Jars::Installer::Dependency.parse('   org.apache.maven:maven-repository-metadata:jar:3.1.0:compile:/usr/local/repository/org/apache/maven/maven-repository-metadata/3.1.0/maven-repository-metadata-3.1.0.jar')
+    assert Jars::Installer::Dependency.parse('   org.apache.maven:maven-repository-metadata:pom:3.1.0:compile:/usr/local/repository/org/apache/maven/maven-repository-metadata/3.1.0/maven-repository-metadata-3.1.0.jar')
   end
 
   it 'should parse dependency line test scope' do
-    dep = Jars::Installer::Dependency.new(+'   org.apache.maven:maven-repository-metadata:jar:3.1.0:test:/usr/local/repository/org/apache/maven/maven-repository-metadata/3.1.0/maven-repository-metadata-3.1.0.jar')
+    dep = Jars::Installer::Dependency.parse('   org.apache.maven:maven-repository-metadata:jar:3.1.0:test:/usr/local/repository/org/apache/maven/maven-repository-metadata/3.1.0/maven-repository-metadata-3.1.0.jar')
     _(dep.type).must_equal :jar
     _(dep.scope).must_equal :test
     _(dep.gav).must_equal 'org.apache.maven:maven-repository-metadata:3.1.0'
@@ -23,7 +23,7 @@
   end
 
   it 'should parse dependency line provided scope' do
-    dep = Jars::Installer::Dependency.new(+'   org.apache.maven:maven-repository-metadata:jar:3.1.0:provided:/usr/local/repository/org/apache/maven/maven-repository-metadata/3.1.0/maven-repository-metadata-3.1.0.jar')
+    dep = Jars::Installer::Dependency.parse('   org.apache.maven:maven-repository-metadata:jar:3.1.0:provided:/usr/local/repository/org/apache/maven/maven-repository-metadata/3.1.0/maven-repository-metadata-3.1.0.jar')
     _(dep.type).must_equal :jar
     _(dep.scope).must_equal :provided
     _(dep.gav).must_equal 'org.apache.maven:maven-repository-metadata:3.1.0'
@@ -33,7 +33,7 @@
   end
 
   it 'should parse dependency line runtim scope' do
-    dep = Jars::Installer::Dependency.new(+'   org.apache.maven:maven-repository-metadata:jar:3.1.0:compile:/usr/local/repository/org/apache/maven/maven-repository-metadata/3.1.0/maven-repository-metadata-3.1.0.jar')
+    dep = Jars::Installer::Dependency.parse(+'   org.apache.maven:maven-repository-metadata:jar:3.1.0:compile:/usr/local/repository/org/apache/maven/maven-repository-metadata/3.1.0/maven-repository-metadata-3.1.0.jar')
     _(dep.type).must_equal :jar
     _(dep.scope).must_equal :runtime
     _(dep.gav).must_equal 'org.apache.maven:maven-repository-metadata:3.1.0'
@@ -41,7 +41,7 @@
     _(dep.path).must_equal 'org/apache/maven/maven-repository-metadata/3.1.0/maven-repository-metadata-3.1.0.jar'
     _(dep.file).must_equal '/usr/local/repository/org/apache/maven/maven-repository-metadata/3.1.0/maven-repository-metadata-3.1.0.jar'
 
-    dep = Jars::Installer::Dependency.new(+'   org.apache.maven:maven-repository-metadata:jar:3.1.0:runtime:/usr/local/repository/org/apache/maven/maven-repository-metadata/3.1.0/maven-repository-metadata-3.1.0.jar')
+    dep = Jars::Installer::Dependency.parse(+'   org.apache.maven:maven-repository-metadata:jar:3.1.0:runtime:/usr/local/repository/org/apache/maven/maven-repository-metadata/3.1.0/maven-repository-metadata-3.1.0.jar')
     _(dep.type).must_equal :jar
     _(dep.scope).must_equal :runtime
     _(dep.gav).must_equal 'org.apache.maven:maven-repository-metadata:3.1.0'
@@ -51,7 +51,7 @@
   end
 
   it 'should parse pom dependency' do
-    dep = Jars::Installer::Dependency.new(+'   org.apache.maven:maven-repository-metadata:pom:3.1.0:compile:/usr/local/repository/org/apache/maven/maven-repository-metadata/3.1.0/maven-repository-metadata-3.1.0.pom')
+    dep = Jars::Installer::Dependency.parse(+'   org.apache.maven:maven-repository-metadata:pom:3.1.0:compile:/usr/local/repository/org/apache/maven/maven-repository-metadata/3.1.0/maven-repository-metadata-3.1.0.pom')
     _(dep.type).must_equal :pom
     _(dep.scope).must_equal :runtime
     _(dep.gav).must_equal 'org.apache.maven:maven-repository-metadata:3.1.0'
@@ -61,7 +61,7 @@
   end
 
   it 'should parse dependency where artifact_id has dots' do
-    dep = Jars::Installer::Dependency.new(+'   org.eclipse.sisu:org.eclipse.sisu.plexus:jar:0.0.0.M2a:compile:/usr/local/repository/org/eclipse/sisu/org.eclipse.sisu.plexus/0.0.0.M2a/org.eclipse.sisu.plexus-0.0.0.M2a.jar')
+    dep = Jars::Installer::Dependency.parse(+'   org.eclipse.sisu:org.eclipse.sisu.plexus:jar:0.0.0.M2a:compile:/usr/local/repository/org/eclipse/sisu/org.eclipse.sisu.plexus/0.0.0.M2a/org.eclipse.sisu.plexus-0.0.0.M2a.jar')
     _(dep.type).must_equal :jar
     _(dep.scope).must_equal :runtime
     _(dep.gav).must_equal 'org.eclipse.sisu:org.eclipse.sisu.plexus:0.0.0.M2a'
@@ -71,7 +71,7 @@
   end
 
   it 'should parse dependency with classifier' do
-    dep = Jars::Installer::Dependency.new(+'   org.sonatype.sisu:sisu-guice:jar:no_aop:3.1.0:compile:/usr/local/repository/org/sonatype/sisu/sisu-guice/3.1.0/sisu-guice-3.1.0-no_aop.jar')
+    dep = Jars::Installer::Dependency.parse(+'   org.sonatype.sisu:sisu-guice:jar:no_aop:3.1.0:compile:/usr/local/repository/org/sonatype/sisu/sisu-guice/3.1.0/sisu-guice-3.1.0-no_aop.jar')
     _(dep.type).must_equal :jar
     _(dep.scope).must_equal :runtime
     _(dep.gav).must_equal 'org.sonatype.sisu:sisu-guice:no_aop:3.1.0'
@@ -81,7 +81,7 @@
   end
 
   it 'should parse dependency on windows' do
-    dep = Jars::Installer::Dependency.new(+'   org.sonatype.sisu:sisu-guice:jar:no_aop:3.1.0:compile:C:\\Users\\Local\\repository\\org\\sonatype\\sisu\\sisu-guice\\3.1.0\\sisu-guice-3.1.0-no_aop.jar')
+    dep = Jars::Installer::Dependency.parse(+'   org.sonatype.sisu:sisu-guice:jar:no_aop:3.1.0:compile:C:\\Users\\Local\\repository\\org\\sonatype\\sisu\\sisu-guice\\3.1.0\\sisu-guice-3.1.0-no_aop.jar')
     _(dep.type).must_equal :jar
     _(dep.scope).must_equal :runtime
     _(dep.gav).must_equal 'org.sonatype.sisu:sisu-guice:no_aop:3.1.0'
@@ -93,7 +93,7 @@
   # these next two combine every possible oddity to try to cover all combinations (classifier, windows path, ANSI and module)
 
   it 'should parse dependency with module section' do
-    dep = Jars::Installer::Dependency.new(+'   org.eclipse.sisu:org.eclipse.sisu.plexus:jar:no_aop:0.0.0.M2a:compile:C:\\Users\\Local\\repository\\org\\sonatype\\sisu\\org.eclipse.sisu.plexus\\0.0.0.M2a\\org.eclipse.sisu.plexus-0.0.0.M2a-no_aop.jar -- module org.sonatype.sisu.sisu-guice')
+    dep = Jars::Installer::Dependency.parse(+'   org.eclipse.sisu:org.eclipse.sisu.plexus:jar:no_aop:0.0.0.M2a:compile:C:\\Users\\Local\\repository\\org\\sonatype\\sisu\\org.eclipse.sisu.plexus\\0.0.0.M2a\\org.eclipse.sisu.plexus-0.0.0.M2a-no_aop.jar -- module org.sonatype.sisu.sisu-guice')
     _(dep.type).must_equal :jar
     _(dep.scope).must_equal :runtime
     _(dep.gav).must_equal 'org.eclipse.sisu:org.eclipse.sisu.plexus:no_aop:0.0.0.M2a'
@@ -103,7 +103,7 @@
   end
 
   it 'should parse dependency with ANSI-colored module section' do
-    dep = Jars::Installer::Dependency.new(+"   org.eclipse.sisu:org.eclipse.sisu.plexus:jar:no_aop:0.0.0.M2a:compile:C:\\Users\\Local\\repository\\org\\sonatype\\sisu\\org.eclipse.sisu.plexus\\0.0.0.M2a\\org.eclipse.sisu.plexus-0.0.0.M2a-no_aop.jar\e[31m -- module org.sonatype.sisu.sisu-guice\e[m")
+    dep = Jars::Installer::Dependency.parse(+"   org.eclipse.sisu:org.eclipse.sisu.plexus:jar:no_aop:0.0.0.M2a:compile:C:\\Users\\Local\\repository\\org\\sonatype\\sisu\\org.eclipse.sisu.plexus\\0.0.0.M2a\\org.eclipse.sisu.plexus-0.0.0.M2a-no_aop.jar\e[31m -- module org.sonatype.sisu.sisu-guice\e[m")
     _(dep.type).must_equal :jar
     _(dep.scope).must_equal :runtime
     _(dep.gav).must_equal 'org.eclipse.sisu:org.eclipse.sisu.plexus:no_aop:0.0.0.M2a'
diff --git a/specs/gemspec_artifacts_spec.rb b/specs/gemspec_artifacts_spec.rb
index f2ba2b3..2035e90 100644
--- a/specs/gemspec_artifacts_spec.rb
+++ b/specs/gemspec_artifacts_spec.rb
@@ -56,140 +56,140 @@
 
 describe Jars::GemspecArtifacts::Artifact do
   it 'ignore unknow type' do
-    _(Jars::GemspecArtifacts::Artifact.new('bla')).must_be_nil
-    _(Jars::GemspecArtifacts::Artifact.new(' _(bla')).must_be_nil
-    _(Jars::GemspecArtifacts::Artifact.new('bla bla _(bla')).must_be_nil
+    _(Jars::GemspecArtifacts::Artifact.parse('bla')).must_be_nil
+    _(Jars::GemspecArtifacts::Artifact.parse(' _(bla')).must_be_nil
+    _(Jars::GemspecArtifacts::Artifact.parse('bla bla _(bla')).must_be_nil
   end
 
   %i[jar pom].each do |type|
     it "parse and to_s of simple GAV #{type}" do
       expected = "#{type} g:a, 1"
-      a = Jars::GemspecArtifacts::Artifact.new(expected)
+      a = Jars::GemspecArtifacts::Artifact.parse(expected)
       _(a.to_s).must_equal expected
       line = "#{type} 'g:a', '1'"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
       line = "#{type} g,a,1"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
       line = "#{type} 'g',\"a\", 1"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
       line = "#{type} g:a:1"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
       line = "#{type} 'g:a:1'"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
     end
 
     it "parse and to_s of simple GAV #{type} with range" do
       expected = "#{type} g:a, [1, 2)"
-      a = Jars::GemspecArtifacts::Artifact.new(expected)
+      a = Jars::GemspecArtifacts::Artifact.parse(expected)
       _(a.to_s).must_equal expected
       line = "#{type} g:a:[1, 2)"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
       line = "#{type} g:a,'[1, 2)'"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
       line = "#{type} 'g', \"a\", ' [1, 2) '"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
     end
 
     it "parse and to_s of simple GAV #{type} with one exclusion" do
       expected = "#{type} g:a, 1, [a:b]"
-      a = Jars::GemspecArtifacts::Artifact.new(expected)
+      a = Jars::GemspecArtifacts::Artifact.parse(expected)
       _(a.to_s).must_equal expected
       line = "#{type} 'g:a', '1', '[a:b]'"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
       line = "#{type} 'g:a', '1', ['a:b']"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
       line = "#{type} g,a,1,[a:b]"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
     end
 
     it "parse and to_s of simple GAV #{type} with exclusions" do
       expected = "#{type} g:a, 1, [a:b, c:d]"
-      a = Jars::GemspecArtifacts::Artifact.new(expected)
+      a = Jars::GemspecArtifacts::Artifact.parse(expected)
       _(a.to_s).must_equal expected
       line = "#{type} 'g:a', '1', ['a:b', 'c:d']'"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
       line = "#{type} g,a,1,[a:b,c:d]"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
     end
 
     it "parse and to_s of simple GAV #{type} with exclusions and range" do
       expected = "#{type} g:a, (1, 2], [a:b, c:d]"
-      a = Jars::GemspecArtifacts::Artifact.new(expected)
+      a = Jars::GemspecArtifacts::Artifact.parse(expected)
       _(a.to_s).must_equal expected
       line = "#{type} 'g:a', '(1,2]', ['a:b', 'c:d']'"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
       line = "#{type} g,a,(1,2],[a:b,c:d]"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
       line = "#{type} g,a,(1,2],  :exclusions : [a:b,c:d]"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
     end
 
     it "parse and to_s of simple GACV #{type}" do
       expected = "#{type} g:a, c, 1"
-      a = Jars::GemspecArtifacts::Artifact.new(expected)
+      a = Jars::GemspecArtifacts::Artifact.parse(expected)
       _(a.to_s).must_equal expected
       line = "#{type} 'g:a', 'c', '1'"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
       line = "#{type} g,a,\"c\",1"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
       line = "#{type}  g,a, 1  ,:classifier : c"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
     end
 
     it "parse and to_s of simple GACV #{type} with range" do
       expected = "#{type} g:a, c, [1, 2)"
-      a = Jars::GemspecArtifacts::Artifact.new(expected)
+      a = Jars::GemspecArtifacts::Artifact.parse(expected)
       _(a.to_s).must_equal expected
       _(a.scope).must_be_nil
       line = "#{type} g:a:c:[1, 2),:scope=>:runtime"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
       _(a.scope).must_equal 'runtime'
       line = "#{type} g:a:c,'[1, 2)'"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
       line = "#{type} 'g', \"a\", 'c', ' [1, 2) '"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
       line = "#{type}  g,a,[1,  2),:classifier => c"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
     end
 
     it "parse and to_s of simple GACV #{type} with exclusions and range" do
       expected = "#{type} g:a, c, (1, 2], [a:b, c:d]"
-      a = Jars::GemspecArtifacts::Artifact.new(expected)
+      a = Jars::GemspecArtifacts::Artifact.parse(expected)
       _(a.to_s).must_equal expected
       _(a.scope).must_be_nil
       line = "#{type} 'g:a:c', '(1,2]', ['a:b', 'c:d']'"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
       _(a.scope).must_be_nil
       line = "#{type} g,a,c,(1,2],[a:b,c:d], :scope => :compile"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
       _(a.scope).must_equal 'compile'
       line = "#{type}  g,a,(1,2],:classifier => c,:exclusions => [a:b,c:d]"
-      a = Jars::GemspecArtifacts::Artifact.new(line)
+      a = Jars::GemspecArtifacts::Artifact.parse(line)
       _(a.to_s).must_equal expected
     end
   end
@@ -230,7 +230,7 @@
     _(artifacts[5].exclusions).must_be_nil
 
     artifacts.each do |a|
-      _(a.to_s).must_equal Jars::GemspecArtifacts::Artifact.new(a.to_s).to_s
+      _(a.to_s).must_equal Jars::GemspecArtifacts::Artifact.parse(a.to_s).to_s
     end
 
     _(artifacts.size).must_equal 7
diff --git a/specs/jar_installer_spec.rb b/specs/jar_installer_spec.rb
index d522142..5040afa 100644
--- a/specs/jar_installer_spec.rb
+++ b/specs/jar_installer_spec.rb
@@ -60,10 +60,8 @@ def do_install(vendor, write)
   it 'just skips install_jars and vendor_jars if there are no requirements' do
     jar = Jars::Installer.new
     jar.install_jars
-    # vendor method is a mocked method
-    _(jar.vendor).must_be_nil
+    _(jar.vendor).must_be_nil # vendor method is a mocked method
     jar.vendor_jars
-    # vendor method is a mocked method
     _(jar.vendor).must_be_nil
   end
 
@@ -72,30 +70,24 @@ def do_install(vendor, write)
     spec.platform = 'ruby'
     jar = Jars::Installer.new(spec)
     jar.install_jars
-    # vendor method is a mocked method
-    _(jar.vendor).must_be_nil
+    _(jar.vendor).must_be_nil # vendor method is a mocked method
     jar.vendor_jars
-    # vendor method is a mocked method
-    _(jar.vendor).must_be_nil
+    _(jar.vendor).must_be_nil # vendor method is a mocked method
   end
 
   it 'does install_jars and vendor_jars' do
     ENV['JARS_VENDOR'] = nil
     jar = Jars::Installer.new(example_spec)
     jar.install_jars
-    # vendor method is a mocked method
-    assert_nil jar.vendor
+    assert_nil jar.vendor # vendor method is a mocked method
     ENV['JARS_VENDOR'] = 'false'
     jar.vendor_jars
-    # vendor method is a mocked method
     assert_nil jar.vendor
     ENV['JARS_VENDOR'] = 'true'
     jar.vendor_jars
-    # vendor method is a mocked method
     _(jar.vendor).must_equal 'lib'
     java.lang.System.set_property('jars.vendor', 'false')
     jar.vendor_jars
-    # vendor method is a mocked method
     assert_nil jar.vendor
   end
 
diff --git a/specs/jars_spec.rb b/specs/jars_spec.rb
index 3514ded..9334c99 100644
--- a/specs/jars_spec.rb
+++ b/specs/jars_spec.rb
@@ -1,12 +1,13 @@
 # frozen_string_literal: true
 
 require File.expand_path('setup', File.dirname(__FILE__))
+require 'minitest/mock'
 
 require 'stringio'
+
 describe Jars do
   before do
-    @env = ENV.to_h
-    # helpful when debugging
+    @env = ENV.to_h # helpful when debugging
     Jars.reset
   end
 
@@ -122,7 +123,7 @@
     Jars.reset
 
     fake = Object.new
-    def fake.lock_down(_vendor_dir = nil, **_kwargs)
+    def fake.lock_down(...)
       [Jars.debug?, Jars.verbose?, ENV['JARS_SKIP_LOCK']]
     end
 
@@ -364,4 +365,37 @@ def fake.lock_down(_vendor_dir = nil, **_kwargs)
     Jars.setup jars_lock: 'Jars_no_jline.lock'
     _(Jars.lock).must_equal 'Jars_no_jline.lock'
   end
+
+  it 'only suppresses version conflict warnings for jars in the lockfile' do
+    lock_file = File.join(Dir.pwd, 'Jars_test_46.lock')
+    File.write(lock_file, "org.slf4j:slf4j-simple:1.6.6:compile:\n")
+    ENV['JARS_HOME'] = File.join('specs', 'repo')
+    ENV['JARS_LOCK'] = lock_file
+    Jars.instance_variable_set(:@jars_lock, false)
+    Jars.reset
+
+    # trigger lock file loading
+    $stderr = StringIO.new
+    require_jar('org.slf4j', 'slf4j-simple', '1.6.6')
+
+    _($stderr.string).must_equal ''
+    assert_nil Jars.quiet?
+    # verify only the lock jar is tracked
+    _(Jars.locked_jar?('org.slf4j:slf4j-simple')).must_equal true
+    _(Jars.locked_jar?('some:other')).must_equal false
+
+    require 'jopenssl/version'
+    # verify conflict for a lock jar is suppressed
+    require_jar('org.slf4j', 'slf4j-simple', '1.7.4')
+    _($stderr.string).must_equal ''
+    require_jar('org.bouncycastle', 'bcpkix-jdk18on', JOpenSSL::BOUNCY_CASTLE_VERSION)
+    require_jar('org.bouncycastle', 'bcpkix-jdk18on', '1.42')
+    # warn still happens for non-lock jars
+    _($stderr.string).must_match 'jar conflict: org.bouncycastle:bcpkix-jdk18on already loaded'
+  ensure
+    $stderr = STDERR
+    FileUtils.rm_rf(lock_file) if lock_file
+    ENV['JARS_HOME'] = nil
+    ENV['JARS_LOCK'] = nil
+  end
 end
diff --git a/specs/mima_spec.rb b/specs/mima_spec.rb
index 1c92fd6..f875e6d 100644
--- a/specs/mima_spec.rb
+++ b/specs/mima_spec.rb
@@ -28,9 +28,9 @@
     ENV['JARS_DEBUG'] = 'true'
     $stderr = StringIO.new
 
-    artifact = Jars::GemspecArtifacts::Artifact.new('jar org.example:example, 1.0')
+    artifact = Jars::GemspecArtifacts::Artifact.parse('jar org.example:example, 1.0')
     begin
-      Jars::Mima.resolve_artifacts([ artifact ])
+      Jars::Mima.resolve_artifacts([artifact])
     rescue org.eclipse.aether.resolution.DependencyResolutionException
       # expected
     end
diff --git a/specs/setup.rb b/specs/setup.rb
index 0a893aa..917fbc1 100644
--- a/specs/setup.rb
+++ b/specs/setup.rb
@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
-# single spec setup
-$LOAD_PATH.unshift File.join(File.dirname(File.expand_path(__FILE__)), '../lib')
+require 'bundler/setup'
 
 ENV['JARS_HOME'] = nil
 require 'jar_dependencies'
@@ -9,9 +8,4 @@
 p ENV['JARS_LOCAL_MAVEN_REPO'] = Jars.home
 Jars.reset
 
-begin
-  require 'minitest'
-rescue LoadError
-  # ignore
-end
 require 'minitest/autorun'