You might have heard that the latest GlassFish 3.1.2.2 is out. You can download it from both glassfish.org and oracle.com . According to the announcement in the GlassFish forums it covers three bugs which have been categorized by feedback from the community. These are:

- wsimport Ant tasks causes NoClassDefFoundError from many places from within some java app ( JAX_WS-1059)
- NoClassDefFoundError: org/openide/util/Enumerations$1RDupls due to use of WebServices (NetBeans Bug 211962)
- JK listener with Apache + mod_ajp_proxy causes truncated downloads ( GLASSFISH-18446)

According to an email to the http://java.net/projects/glassfish/lists/users/archive there are some more details about what exactly has been fixed:

Grizzly:
- AJP connector can not recover after unexpected EOF ( GRIZZLY-1284)
- This error occurs occasionally for no apparent reason, causing glassfish does not deliver all packets. ( GRIZZLY-1254)
- Errow when posting data with "Expect: 100-continue" header via ajp with mod_proxy_ajp in apache ( GRIZZLY-1267)
- CPing/CPong doesn' work ( GRIZZLY-1276)
- NPE when attempting to get the session from a request associated with a websocket. ( GRIZZLY-1270) - Add memory tuning option for MimeHeaders ( GRIZZLY-1285) - Incorrect timeout switch logic may cause unexpected interruption of a thread ( GRIZZLY-1286)

GlassFish:
- JK listener with Apache + mod_ajp_proxy causes truncated downloads ( GLASSFISH-18446)
- Windows Services - can't handle paths with spaces ( GLASSFISH-18546)
- install-node-dcom does not abide by --windowsdomain parameter ( GLASSFISH-18327)
- Incompatibel breaking changes to getParameter() / getPart() probably for Ticket GLASSFISH-16740 ( GLASSFISH-18444)

Metro/JAX-WS:
- java.lang.ClassCastException: org.glassfish.gmbal.ManagedObjectManagerNOPImpl cannot be cast to com.sun.xml.ws.server.WSEndpointMOMProxy ( WSIT-1619)
- wsimport Ant tasks causes NoClassDefFoundError from many places from within some java app ( JAX_WS-1059)

And more news:
And also if you compare the two distributions (zip archives of both  GF 3.1.2 and GF 3.1.2.2) you notice some more changes.
- It seems as if JBoss Logging 3 ( 3.1.0.GA) is now part of GlassFish. Find the jboss-logging.jar in the modules folder.
- Grizzlyhas been updated to 1.9.50
- Both org.apache.felix.shell.jar and *.shell.tui.jar have been removed.
- The Rest interface for GlassFish Management and Monitoring got an update to 3.1.2.1-SNAPSHOT
- The Weld implementation is now at 1.1.8.Final (yeahhaaa :-))
- Metro has been updated to 2.2.0-1 (which actually isn't a "version" in their jira (wondering)