You need to compile GWT with the appropriate language profile. If you want to compile with all languages make sure to include the all-langs profile in your maven build command. for instance: mvn clean install -Pdep,gwt-user,gwt-admin,all-langs Be aware that compiling all languages will take a long time ~30 minutes on my machine. You can specify particular languages to cut down on compile time. Alexander On Wednesday, April 17, 2013 09:27:25 PM 李强 wrote: HI：All I install ovirt engine and open IE9 to manage. But I select Chinese language UI to display and failed. The UI's language always is Englisth and covers to Other language failed. OS:federa 18. Ovirt-Engine:3.2 MEM Size:4G DIsk:60G CPU:intel i7 Manage OS:Win7 Sp1 Manage IE:9 Can you help me? Thanks,