Errai 4.0.0.CR2 发布了，该版本包含了大多数的 bug 修复以及一些 demo 的增强。下面是一些值得关注的更新：
Previously doing a parallel Maven build of an Errai project could occasionally lead to compilation failures. This release provides a fix so that parallel builds can now reliably execute on Errai projects.
During the migration from GWT 2.7 to 2.8 many Errai demo Jetty configurations stopped working, and consequently they were simply removed. Thanks to Dmitrii Tikhomirov, many of the Errai demos now have Jetty profiles once more so you can see how to build an Errai application for deployment outside of a Java EE app server.
A bug in Errai logging had broken source mapping of stack traces in errors logged through Errai. The result was that stack traces printed to the console in Google Chrome would only show obfuscated method names and line numbers. The problem has been fixed so that stack traces logged to the console once again use source maps to show line numbers from the Java source.
Stay tuned as we get closer to our first final release of Errai 4. Until then, happy coding!