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https://issues.apache.org/jira/browse/HTTPCLIENT-2125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17224748#comment-17224748
]
Dominik Derwiński commented on HTTPCLIENT-2125:
-----------------------------------------------
I can confirm the bug is gone when disabling
.setConnectionReuseStrategy(NoConnectionReuseStrategy.INSTANCE)
where NoConnectionReuseStrategy is
{noformat}
@Contract(threading = ThreadingBehavior.IMMUTABLE)
public final class NoConnectionReuseStrategy implements ConnectionReuseStrategy
{
public static final NoConnectionReuseStrategy INSTANCE = new
NoConnectionReuseStrategy();
public NoConnectionReuseStrategy() {
super();
}
@Override
public boolean keepAlive(HttpRequest request, HttpResponse response,
HttpContext context) {
return false;
}
}
{noformat}
> NullPointerException in BasicHttpClientConnectionManager
> --------------------------------------------------------
>
> Key: HTTPCLIENT-2125
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2125
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpClient (classic)
> Affects Versions: 5.0.3
> Reporter: Dominik Derwiński
> Priority: Major
>
> After switching to HttpClient 5 I get a NPE in a code that was previously
> working. It's a pretty simple line
> {noformat}
> try (CloseableHttpResponse response = httpclient.execute(get, context)) {
> {noformat}
> which causes this:
> {noformat}
> Caused by: java.lang.NullPointerException
> at
> org.apache.hc.client5.http.impl.io.BasicHttpClientConnectionManager.release(BasicHttpClientConnectionManager.java:278)
> at
> org.apache.hc.client5.http.impl.classic.InternalExecRuntime.discardEndpoint(InternalExecRuntime.java:245)
> at
> org.apache.hc.client5.http.impl.classic.InternalExecRuntime.releaseEndpoint(InternalExecRuntime.java:259)
> at
> org.apache.hc.client5.http.impl.classic.MainClientExec.execute(MainClientExec.java:136)
> at
> org.apache.hc.client5.http.impl.classic.ExecChainElement.execute(ExecChainElement.java:51)
> at
> org.apache.hc.client5.http.impl.classic.ExecChainElement$1.proceed(ExecChainElement.java:57)
> at
> org.apache.hc.client5.http.impl.classic.ConnectExec.execute(ConnectExec.java:181)
> at
> org.apache.hc.client5.http.impl.classic.ExecChainElement.execute(ExecChainElement.java:51)
> at
> org.apache.hc.client5.http.impl.classic.ExecChainElement$1.proceed(ExecChainElement.java:57)
> at
> org.apache.hc.client5.http.impl.classic.ProtocolExec.execute(ProtocolExec.java:172)
> at
> org.apache.hc.client5.http.impl.classic.ExecChainElement.execute(ExecChainElement.java:51)
> at
> org.apache.hc.client5.http.impl.classic.ExecChainElement$1.proceed(ExecChainElement.java:57)
> at
> org.apache.hc.client5.http.impl.classic.HttpRequestRetryExec.execute(HttpRequestRetryExec.java:93)
> at
> org.apache.hc.client5.http.impl.classic.ExecChainElement.execute(ExecChainElement.java:51)
> at
> org.apache.hc.client5.http.impl.classic.ExecChainElement$1.proceed(ExecChainElement.java:57)
> at
> org.apache.hc.client5.http.impl.classic.ContentCompressionExec.execute(ContentCompressionExec.java:128)
> at
> org.apache.hc.client5.http.impl.classic.ExecChainElement.execute(ExecChainElement.java:51)
> at
> org.apache.hc.client5.http.impl.classic.InternalHttpClient.doExecute(InternalHttpClient.java:178)
> at
> org.apache.hc.client5.http.impl.classic.CloseableHttpClient.execute(CloseableHttpClient.java:75)
> {noformat}
> The request itself seems to be working, the problem is closing connection
> (I'm using a NoConnectionReuseStrategy which mimics the old Strategy
> available in version 4). This is in the log before crash:
> {noformat}
> [2020-11-02 16:35:53.389]
> [org.apache.hc.client5.http.impl.io.DefaultManagedHttpClientConnection]
> [main] [DEBUG]
> [org.apache.hc.client5.http.impl.io.DefaultManagedHttpClientConnection]
> [close] [143] : http-outgoing-0: close connection IMMEDIATE
> [2020-11-02 16:35:53.390]
> [org.apache.hc.client5.http.impl.classic.InternalHttpClient] [main] [DEBUG]
> [org.apache.hc.client5.http.impl.classic.InternalExecRuntime]
> [discardEndpoint] [239] : InternalConnectionEndpoint-5175d9ad: endpoint closed
> [2020-11-02 16:35:53.390]
> [org.apache.hc.client5.http.impl.classic.InternalHttpClient] [main] [DEBUG]
> [org.apache.hc.client5.http.impl.classic.InternalExecRuntime]
> [discardEndpoint] [243] : InternalConnectionEndpoint-5175d9ad: discarding
> endpoint
> [2020-11-02 16:35:53.390]
> [org.apache.hc.client5.http.impl.io.BasicHttpClientConnectionManager] [main]
> [DEBUG] [org.apache.hc.client5.http.impl.io.BasicHttpClientConnectionManager]
> [closeConnection] [209] : Closing connection GRACEFUL
> {noformat}
> Seems like the code doesn't check whether conn is null when calling
> conn.passivate(); (but it does check for null when doing debug logging at
> start of release method).
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