Merge pull request #5820 from eclipse/jetty-9.4.x-5819-PoolArithmetic…

…Exception backport fix for ArithmeticException in Pool
jetty · Dec 17, 2020 · d5648c7 · d5648c7
2 parents 38f0fc4 + 4478233
commit d5648c7
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/jetty-util/src/main/java/org/eclipse/jetty/util/Pool.java b/jetty-util/src/main/java/org/eclipse/jetty/util/Pool.java
@@ -301,6 +301,11 @@ public Entry acquire()
             {
                 LOGGER.ignore(e);
                 size = entries.size();
+                // Size can be 0 when the pool is in the middle of
+                // acquiring a connection while another thread
+                // removes the last one from the pool.
+                if (size == 0)
+                    break;
             }
             index = (index + 1) % size;
         }