在你把 Spring 的 @JmsListener concurrency 调到 “30‑85” 之後，Artemis Broker 端預設的執行緒池只有 30 條，且排程池（scheduled pool）只有 5 條，當超出時就會在伺服器 log 裡每隔 5 秒左右出現「執行緒池耗盡／拒絕執行」的異常。解決方案就是把這兩個池都放大：
1. 調整 Artemis 主執行緒池（thread‑pool‑max‑size）
預設值 30；要支援上限 85 條 concurrent consumer，至少設 ≥ 85：
bash
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# 連上 JBoss CLI
jboss-cli.sh --connect
# 把主 pool 擴到 100 條
/subsystem=messaging-activemq/server=default:write-attribute(name=thread-pool-max-size,value=100)
# 重新載入
reload
這樣 Broker 才能為每條 consumer 提供足夠的執行緒。
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2. 調整排程執行緒池（scheduled‑thread‑pool‑max‑size）
Artemis 用這個 pool 來做重試、清理、metrics 等排程工作，預設只有 5 條，超載也會抛異常。建議也一併放大：
bash
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# 調度池也調大到 20 條
/subsystem=messaging-activemq/server=default:write-attribute(name=scheduled-thread-pool-max-size,value=20)
# 再次 reload
reload
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3. 確認 & 驗證
讀回設定，確保生效：
bash
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/subsystem=messaging-activemq/server=default:read-attribute(name=thread-pool-max-size)
/subsystem=messaging-activemq/server=default:read-attribute(name=scheduled-thread-pool-max-size)
重啟或 redeploy Spring 應用，使 concurrency="30-85" 生效。
觀察 server.log，應不再有「執行緒池耗盡」的錯誤；並可用 JConsole／VisualVM 看 Broker 執行緒數。
若仍有錯，請協助提供
– JBoss EAP 8 server.log 裡的完整 Exception stacktrace
– Spring 應用 log 中 “Starting JmsListenerContainer with concurrency=30-85” 訊息
這樣才能進一步針對錯誤細節做診斷。
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