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From "Eli Bishop (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HTTPCLIENT-1225) A cacheable no-body response causes a NPE when that cache entry is hit
Date Fri, 24 Aug 2012 01:14:41 GMT
Eli Bishop created HTTPCLIENT-1225:

             Summary: A cacheable no-body response causes a NPE when that cache entry is hit
                 Key: HTTPCLIENT-1225
                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1225
             Project: HttpComponents HttpClient
          Issue Type: Bug
          Components: Cache
    Affects Versions: 4.2.1
            Reporter: Eli Bishop

The fix for HTTPCLIENT-1202 removed null checking on the resource field of HttpCacheEntry.
Unfortunately, CacheValidityPolicy expects the resource to be non-null, so you can get an
NPE on the next cache hit on that entry:
  at org.apache.http.impl.client.cache.CacheValidityPolicy.contentLengthHeaderMatchesActualLength(CacheValidityPolicy.java:219)
  at org.apache.http.impl.client.cache.CachedResponseSuitabilityChecker.canCachedResponseBeUsed(CachedResponseSuitabilityChecker.java:139)
  at org.apache.http.impl.client.cache.CachingHttpClient.handleCacheHit(CachingHttpClient.java:446)
  at org.apache.http.impl.client.cache.CachingHttpClient.execute(CachingHttpClient.java:437)
  at org.apache.http.impl.client.cache.CachingHttpClient.execute(CachingHttpClient.java:353)

As far as I can tell, the resource will only be null if the response status is one that can
never have a response body: 204, 205, or 304. There's other special-case logic for 304 which
seems to avoid hitting this code path; but if a server returns a 204 or 205 with a Cache-Control
header (unusual, but I saw it happen), you have a problem.

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