OutOfMemory exceptions on EAP 7.2.0 with memory retention in io.undertow.server.protocol.http.HttpOpenListener

Issue

• The EAP instance is slowly running out of memory over time, needs to be restarted daily.

• Messages on JMS queues stops to be consumed.

• Looking at a heap dump, we can see memory in HttpServerConnections accumulating in the HttpOpenListener's connections map:

Class Name                                                                | Shallow Heap | Retained Heap | Percentage | Retained Heap
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io.undertow.server.protocol.http.HttpOpenListener @ 0x6c39be4e8           |           48 | 2,221,973,536 |     72.73% | 2,221,973,536
|- java.util.Collections$SetFromMap @ 0x6c39be518                         |           24 | 2,221,973,336 |     72.73% |              
|  |- java.util.concurrent.ConcurrentHashMap @ 0x6c39be530                |           64 | 2,221,973,288 |     72.73% |              
|  |  |- java.util.concurrent.ConcurrentHashMap$Node[131072] @ 0x74a4f3e70|      524,304 | 2,221,973,152 |     72.73% |              
|  |  |  |- java.util.concurrent.ConcurrentHashMap$Node @ 0x6f9cb9018     |           32 |       172,088 |      0.01% |              
|  |  |  |- java.util.concurrent.ConcurrentHashMap$Node @ 0x71b5700c8     |           32 |       165,920 |      0.01% |              
|  |  |  |- java.util.concurrent.ConcurrentHashMap$Node @ 0x71aae0f38     |           32 |       165,576 |      0.01% |              
|  |  |  |- java.util.concurrent.ConcurrentHashMap$Node @ 0x701960c00     |           32 |       165,320 |      0.01% |              
|  |  |  |- java.util.concurrent.ConcurrentHashMap$Node @ 0x72007d900     |           32 |       165,208 |      0.01% |              
|  |  |  |- java.util.concurrent.ConcurrentHashMap$Node @ 0x71a2ae2f0     |           32 |       165,040 |      0.01% |              
|  |  |  |- java.util.concurrent.ConcurrentHashMap$Node @ 0x6f2d7c548     |           32 |       164,208 |      0.01% |              
|  |  |  |- java.util.concurrent.ConcurrentHashMap$Node @ 0x74f0ada50     |           32 |       163,536 |      0.01% |              
|  |  |  |- java.util.concurrent.ConcurrentHashMap$Node @ 0x74ea19d98     |           32 |       161,744 |      0.01% |              
|  |  |  |- java.util.concurrent.ConcurrentHashMap$Node @ 0x6f66b9c88     |           32 |       159,328 |      0.01% |              
|  |  |  |- java.util.concurrent.ConcurrentHashMap$Node @ 0x711386590     |           32 |       159,256 |      0.01% |              
|  |  |  |- java.util.concurrent.ConcurrentHashMap$Node @ 0x71a6121a0     |           32 |       159,184 |      0.01% |              
|  |  |  |- java.util.concurrent.ConcurrentHashMap$Node @ 0x74ebc3fe0     |           32 |       159,184 |      0.01% |              
|  |  |  |- java.util.concurrent.ConcurrentHashMap$Node @ 0x719f3d190     |           32 |       159,152 |      0.01% |              
|  |  |  |- java.util.concurrent.ConcurrentHashMap$Node @ 0x710879300     |           32 |       159,048 |      0.01% |              
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