diff --git a/.travis.yml b/.travis.yml
index 12b4c1cff..706e7fd79 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,9 @@
+language: ruby
 gemfile:
-  - Gemfile
   - gemfiles/rails3_0.gemfile
   - gemfiles/rails3_1.gemfile
+  - gemfiles/rails3_2.gemfile
   - gemfiles/rails4_0.gemfile
-language: ruby
 rvm:
   - 1.8.7
   - 1.9.3
@@ -16,3 +16,16 @@ matrix:
   exclude:
     - rvm: 1.8.7
       gemfile: gemfiles/rails4_0.gemfile
+  include:
+    - rvm: jruby-19mode
+      gemfile: gemfiles/rails3_0.gemfile
+      env: JRUBY_OPTS="--server -Xcompile.invokedynamic=false -J-XX:+TieredCompilation -J-XX:TieredStopAtLevel=1 -J-noverify -J-Xms512m -J-Xmx1024m"
+    - rvm: jruby-19mode
+      gemfile: gemfiles/rails3_1.gemfile
+      env: JRUBY_OPTS="--server -Xcompile.invokedynamic=false -J-XX:+TieredCompilation -J-XX:TieredStopAtLevel=1 -J-noverify -J-Xms512m -J-Xmx1024m"
+    - rvm: jruby-19mode
+      gemfile: gemfiles/rails3_2.gemfile
+      env: JRUBY_OPTS="--server -Xcompile.invokedynamic=false -J-XX:+TieredCompilation -J-XX:TieredStopAtLevel=1 -J-noverify -J-Xms512m -J-Xmx1024m"
+    - rvm: jruby-19mode
+      gemfile: gemfiles/rails4_0.gemfile
+      env: JRUBY_OPTS="--server -Xcompile.invokedynamic=false -J-XX:+TieredCompilation -J-XX:TieredStopAtLevel=1 -J-noverify -J-Xms512m -J-Xmx1024m"
diff --git a/spec/unit/extensions_spec.rb b/spec/unit/extensions_spec.rb
index 42a3f1466..9cba6ec53 100644
--- a/spec/unit/extensions_spec.rb
+++ b/spec/unit/extensions_spec.rb
@@ -307,7 +307,7 @@
 
     it "should be time to milliseconds if string" do
       Time.zone = 'Hawaii'
-      Time.to_mongo('2009-08-15 14:00:00.123456').to_f.should be_within(0.0000001).of(Time.utc(2009, 8, 16, 0, 0, 0, 123456).to_f)
+      Time.to_mongo('2009-08-15 14:00:00.123000').to_f.should be_within(0.0000001).of(Time.utc(2009, 8, 16, 0, 0, 0, 123000).to_f)
       Time.zone = nil
     end
 
diff --git a/spec/unit/model_generator_spec.rb b/spec/unit/model_generator_spec.rb
index f6b263084..e015e2491 100644
--- a/spec/unit/model_generator_spec.rb
+++ b/spec/unit/model_generator_spec.rb
@@ -9,12 +9,13 @@
 
   before do
     prepare_destination
-    # run_generator
   end
 
   it 'help shows MongoMapper options' do
-    content = run_generator ['--help']
-    assert_match(/rails generate mongo_mapper:model/, content)
+    pending "Rails 4 breaks Kernel#capture on JRuby", :if => (Rails::VERSION::MAJOR >= 4 && RUBY_PLATFORM == "java") do
+      content = run_generator ['--help']
+      assert_match(/rails generate mongo_mapper:model/, content)
+    end
   end
 
   it 'model are properly created' do