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I have my resource Bundle saved in properties files. If I add a new value I get an * next to the file name on the tab. However when I right click the tab the save option is grayed out. There is a workaround: If you open a java file and make a change, then recompile this saves all the files currently open including the properties file
This seems to be a duplicate of bug #41178 (Properties file can't be saved except by "Save all..."). *** This issue has been marked as a duplicate of 41178 ***