https://bz.apache.org/bugzilla/show_bug.cgi?id=61673
Bug ID: 61673
Summary: java.util.ConcurrentModificationException thrown when
trying to push around 1000 resources using PushBuilder
Product: Tomcat 9
Version: 9.0.1
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: -----
Exception in thread "https-openssl-apr-8443-exec-178"
java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)
at java.util.HashMap$ValueIterator.next(HashMap.java:1466)
at
org.apache.coyote.http2.Http2UpgradeHandler.close(Http2UpgradeHandler.java:943)
at
org.apache.coyote.http2.Http2UpgradeHandler.closeConnection(Http2UpgradeHandler.java:483)
at org.apache.coyote.http2.Stream.close(Stream.java:600)
at
org.apache.coyote.http2.StreamProcessor.process(StreamProcessor.java:85)
at org.apache.coyote.http2.StreamRunnable.run(StreamRunnable.java:35)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
ConcurrentModificationException is thrown when trying to push around 1000
resources from a servlet. Note, this issue is not consistently reproducible.
Steps to reproduce:
1. Access the demo.html (details provided below) over http and it works fine
2. Keep the browser open and idle for few mins (i tried the next request after
5 mins)
3. Then try to invoke the demo servlet (details provided below) over https, you
can now see the concurrent-modification-exception in tomcat log
Environment:
Tomcat 9.0.1
JDK 8 update 131
tomcat-native-1.2.14-win32-bin (64bit)
Firefox 56 (64bit)
Enabled HTTP/2 using the below configuration
<Connector port="8443" protocol="org.apache.coyote.http11.Http11AprProtocol"
maxThreads="150" SSLEnabled="true" >
<UpgradeProtocol className="org.apache.coyote.http2.Http2Protocol" />
<SSLHostConfig>
<Certificate certificateKeyFile="certs/ca.key"
certificateFile="certs/ca.crt"
type="RSA" />
</SSLHostConfig>
</Connector>
Code snippet to reproduce the issue (DemoServlet doGet method)
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PushBuilder pb = request.newPushBuilder();
for(int i=0;i<1000;i++) {
String image = "image-"+i+".png";
pb.path("/images/"+image);
pb.push();
}
request.getRequestDispatcher("/demo.html").include(request,
response);
}
demo.html is a simple html file with a list of 1000 image tags.
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