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Date: Thu, 13 Dec 2012 09:59:21 +0000 (UTC)
From: "Francois-Xavier Bonnet (JIRA)" <jira@apache.org>
To: dev@hc.apache.org
Message-ID: <JIRA.12623696.1355392679862.27905.1355392761636@arcas>
In-Reply-To: <JIRA.12623696.1355392679862@arcas>
References: <JIRA.12623696.1355392679862@arcas>
Subject: [jira] [Created] (HTTPCLIENT-1276) NullPointerException when 304
 response updates a cache entry
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Francois-Xavier Bonnet created HTTPCLIENT-1276:
--------------------------------------------------

             Summary: 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


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)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:592)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:69)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:48)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:292)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)


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