With ruby-1.7.13 we are starting to run into some class loader issues as there are conflicting versions of this jar on the classpath. We had an instance where 2.2.4 was already used in the class loader, but gson.rb would fail because it wasn't able to resolve the right code by loading the 2.2.2 jar. Please consider upgrading to the patch version of 2.2.4.
With ruby-1.7.13 we are starting to run into some class loader issues as there are conflicting versions of this jar on the classpath. We had an instance where 2.2.4 was already used in the class loader, but gson.rb would fail because it wasn't able to resolve the right code by loading the 2.2.2 jar. Please consider upgrading to the patch version of 2.2.4.