java.util.MissingResourceException: Can't find bundle for base name

Solvejava.util.MissingResourceException:Can'tfindbundleforbasenamecom...config,localezh_CN
atjava.util.ResourceBundle.throwMissingResourceException(ResourceBundle.java:836)

atjava.util.ResourceBundle.getBundleImpl(ResourceBundle.java:805)

atjava.util.ResourceBundle.getBundle(ResourceBundle.java:576)
Youknowjavaislookingforapropertiesfileinaspecificlocale.Youmaybebaffledwhyjavakeepscomplainingitcan'tfindapropertiesfilethatisrightthere.Afewthingstokeepinmindwhendebugging
thistypeoferrors:

Theseresourcepropertiesfilesareloadedbyclassloader,similartojavaclasses.Soyouneedtoincludetheminyourruntimeclasspath.
Theseresourceshavefully-qualified-resource-name,similartoafully-qualified-class-name,excerptyoucan'timportaresourceintoyourjavasourcefile.Why?becauseitsnametakestheformofastring.

ResourceBundle.getBundle("config")

tellstheclassloadertoloadaresourcenamed

"config"

withdefaultpackage(thatis,nopackage).ItdoesNOTmean
aresourceinthecurrentpackagethathasthereferencingclass.

ResourceBundle.getBundle("com.cheng.scrap.config")

tellstheclassloadertoloadaresourcenamed

"config"

withpackage

"com.cheng.scrap."

Its
fully-qualified-resource-nameis

"com.cheng.scrap.config"

Forinstance,youhaveaprojectlike

C:\ws\netbeans5\scrap>

|build.xml

+---build

|\---classes

|\---com

|\---cheng

|\---scrap

|Scrap.class

|

+---src

|\---com

|\---cheng

|\---scrap

|config.properties

|Scrap.java

Forthisstatementin

Scrap.java:ResourceBundleconfig=ResourceBundle.getBundle("config");

towork,youwillneedto

cp
src\com\cheng\scrap\config.propertiesbuild\classes\

suchthat

config.properties

isdirectlyunder

classes

,andatthesamelevelas

com

.
Alternatively,youcanput

config.properties

intoa

config.jar

suchthat

config.properties

isattheroot
of

config.jar

withoutanysubdirectories,andinclude

config.jar

intheclasspath.
Forthisstatementin

Scrap.java:ResourceBundleconfig=ResourceBundle.getBundle("com.cheng.scrap.config");

towork,youwillneedto

cp
src\com\cheng\scrap\config.propertiesbuild\classes\

com\cheng\scrap\

suchthat

config.properties

isdirectlyunder

classes

\

com\cheng\scrap\

,
andatthesamelevelas

scrap

.Alternatively,youcanput

com\cheng\scrap\

config.properties

(alongwiththelongsubdirectories)intoa

config.jar

,and
includeconfig.jarintheclasspath.[/code]
Youmaybewonderingwhyitismadesoconfusing?Thebenefitsaretwo-fold,asIseeit:

Locationtransparency.Atruntime,config.propertiesisNOTafile,it'sjustaaloadableresource.config.properitesmaynotexistinyourprojectatall,andthepersonwhowroteScrap.javamayhaveneverseenthisresource.AURLClassLoadercan
finditinanetworkpathorURLatruntime.Thisisespeciallyimportantforserver-sidecomponentssuchasEJB,Servlet,JSP,etc,whoarenormallynotallowedtoaccessfilesystems.Whenyouaskclassloadersforaresource,itsphysicallocationbecomes
irrelevant.
Namespacemechanism.Havingapackageallowsmultiplepackagestohaveresourceswiththesameshortnamewithoutcausingconflicts.Thisisnodifferentfromjavapackagesandxmlnamespaces.