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Posted to dev@hc.apache.org by "Oleg Kalnichevski (JIRA)" <ji...@apache.org> on 2012/12/13 16:12:12 UTC
[jira] [Resolved] (HTTPCLIENT-1276) NullPointerException when 304
response updates a cache entry
[ https://issues.apache.org/jira/browse/HTTPCLIENT-1276?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Oleg Kalnichevski resolved HTTPCLIENT-1276.
-------------------------------------------
Resolution: Fixed
Fix Version/s: 4.2.3
Fixed committed to both SVN trunk and 4.2.x. Many thanks, Francois-Xavier, for contributing it.
Oleg
> NullPointerException when 304 response updates a cache entry
> ------------------------------------------------------------
>
> Key: HTTPCLIENT-1276
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1276
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: Cache
> Affects Versions: 4.2.2, Snapshot
> Reporter: Francois-Xavier Bonnet
> Priority: Blocker
> Fix For: 4.2.3
>
> Attachments: HTTPCLIENT-1274_HTTPCLIENT-1276.txt
>
>
> When sending a conditional request and the cache entry does not have an entity, CachingHttpClient throws a NullPointerException.
> To reproduce :
> - send a first conditional If-None-Match request and receive a first 304 that generates a cache entry with no entity
> - send a second conditional request and receive another 304
> When updating the cache entry, CachingHttpClient tries to copy the entity of the existing cache entry without testing if it is null.
> Here is a test to reproduce :
> @Test
> public void testNotModifiedResponseUpdatesCacheEntryWhenNoEntity()
> throws Exception {
> Date now = new Date();
> impl = new CachingExec(mockBackend, new BasicHttpCache(),CacheConfig.DEFAULT);
> HttpRequestWrapper req1 = HttpRequestWrapper.wrap(new HttpGet("http://foo.example.com/"));
> req1.addHeader("If-None-Match", "etag");
> HttpRequestWrapper req2 = HttpRequestWrapper.wrap(new HttpGet("http://foo.example.com/"));
> req2.addHeader("If-None-Match", "etag");
> HttpResponse resp1 = new BasicHttpResponse(HttpVersion.HTTP_1_1, HttpStatus.SC_NOT_MODIFIED, "Not modified");
> resp1.setHeader("Date", DateUtils.formatDate(now));
> resp1.setHeader("Cache-Control","max-age=0");
> resp1.setHeader("Etag", "etag");
> HttpResponse resp2 = new BasicHttpResponse(HttpVersion.HTTP_1_1, HttpStatus.SC_NOT_MODIFIED, "Not modified");
> resp2.setHeader("Date", DateUtils.formatDate(now));
> resp2.setHeader("Cache-Control","max-age=0");
> resp1.setHeader("Etag", "etag");
> backendExpectsAnyRequestAndReturn(resp1);
> backendExpectsAnyRequestAndReturn(resp2);
> replayMocks();
> HttpResponse result1 = impl.execute(route, req1);
> HttpResponse result2 = impl.execute(route, req2);
> verifyMocks();
> assertEquals(HttpStatus.SC_NOT_MODIFIED, result1.getStatusLine().getStatusCode());
> assertEquals("etag", result1.getFirstHeader("Etag").getValue());
> assertEquals(HttpStatus.SC_NOT_MODIFIED, result2.getStatusLine().getStatusCode());
> assertEquals("etag", result2.getFirstHeader("Etag").getValue());
> }
> And here is what you get:
> java.lang.NullPointerException
> at org.apache.http.impl.client.cache.HeapResourceFactory.copy(HeapResourceFactory.java:73)
> at org.apache.http.impl.client.cache.CacheEntryUpdater.updateCacheEntry(CacheEntryUpdater.java:90)
> at org.apache.http.impl.client.cache.BasicHttpCache.updateCacheEntry(BasicHttpCache.java:214)
> at org.apache.http.impl.client.cache.CachingExec.revalidateCacheEntry(CachingExec.java:752)
> at org.apache.http.impl.client.cache.CachingExec.revalidateCacheEntry(CachingExec.java:318)
> at org.apache.http.impl.client.cache.CachingExec.handleCacheHit(CachingExec.java:288)
> at org.apache.http.impl.client.cache.CachingExec.execute(CachingExec.java:266)
> at org.apache.http.impl.client.cache.CachingExec.execute(CachingExec.java:219)
> at org.apache.http.impl.client.cache.TestCachingExec.testNotModifiedResponseUpdatesHeadersInCacheWhenNoEntity(TestCachingExec.java:1591)
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