Francois-Xavier Bonnet created HTTPCLIENT-1276:
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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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