Merge branch 'cgfrost-master'

[resolves #129]

Author: nebhale

lib/java_buildpack/container/tomcat/tomcat_gemfire_store.rb

@@ -58,6 +58,7 @@ def sub_components(context)
 
       # (see JavaBuildpack::Component::ModularComponent#command)
       def command
+        return unless supports?
         credentials = @application.services.find_service(FILTER)['credentials']
         @droplet.java_opts.add_system_property 'gemfire.security-username', credentials[KEY_USERNAME]
         @droplet.java_opts.add_system_property 'gemfire.security-password', credentials[KEY_PASSWORD]

spec/java_buildpack/container/tomcat/tomcat_gemfire_store_spec.rb

@@ -57,6 +57,10 @@
     expect(component.detect).to be_nil
   end
 
+  it 'does nothing without a session_replication service during release' do
+    expect(component.command).to be_nil
+  end
+
   it 'creates submodules' do
     expect(JavaBuildpack::Container::GemFire)
       .to receive(:new).with(sub_configuration_context(gemfire_configuration))