Neeraj Krishna created CXF-6999:
-----------------------------------

             Summary: Undocumented IllegalArgumentException thrown on 
getAcceptableLanguages
                 Key: CXF-6999
                 URL: https://issues.apache.org/jira/browse/CXF-6999
             Project: CXF
          Issue Type: Bug
          Components: JAX-RS
    Affects Versions: 3.1.0
            Reporter: Neeraj Krishna
            Priority: Minor


The following exception stack trace is observed when an user provides incorrect 
language header and getAcceptableLanguages is invoked in the implementation of 
ExceptionMapper

err] java.lang.IllegalArgumentException: Illegal locale value : zh-Hans-VN
2016-08-02T09:48:39.691+0530
[App/2]
err
[err] at org.apache.cxf.jaxrs.utils.HttpUtils.getLocale(HttpUtils.java:281)
2016-08-02T09:48:39.692+0530
[App/2]
err
[err] at 
org.apache.cxf.jaxrs.utils.ExceptionUtils.convertFaultToResponse(ExceptionUtils.java:86)
2016-08-02T09:48:39.692+0530
[App/2]
err
[err] at 
org.apache.cxf.jaxrs.impl.tl.ThreadLocalHttpHeaders.getAcceptableLanguages(ThreadLocalHttpHeaders.java:57)



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