[ https://issues.jboss.org/browse/WFLY-12671?page=com.atlassian.jira.plugin... ] Scott Marlow commented on WFLY-12671: ------------------------------------- [~rschimpf] could you please recreate the memory leak (with WF17 is fine) and in Eclipse Memory Analyzer, open the histogram, you can filter to only show PersistenceUnitMetadataImpl if you like or just scroll to PersistenceUnitMetadataImpl. Then, do: # Right mouse button click on the PersistenceUnitMetadataImpl row # Choose Merge Shortest Paths to GC roots # Choose Exclude all phantom/weak/soft etc. references # In the merge_shortest_paths window, fully expand the displayed tree # Select all of the displayed rows and copy to clipboard # Paste clipboard here (or attach as text file attachment). Here is what I see after deploying a small app with WildFly 18.0.0.Final and deleting the standalone/deployments/myapp.jar.deployed file, which undeploys myapp.jar: {code} Class Name | Ref. Objects | Shallow Heap | Ref. Shallow Heap | Retained Heap --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- java.lang.Thread @ 0xe1741c30 IdleRemover Thread | 1 | 120 | 112 | 328 '- <Java Local> org.jboss.jca.core.connectionmanager.pool.idle.IdleRemover$IdleRemoverRunner @ 0xe1a0d1d8 | 1 | 16 | 112 | 16 '- this$0 org.jboss.jca.core.connectionmanager.pool.idle.IdleRemover @ 0xe184d1e0 | 1 | 56 | 112 | 184 '- registeredPools java.util.concurrent.CopyOnWriteArrayList @ 0xe184d218 | 1 | 24 | 112 | 96 '- array java.lang.Object[1] @ 0xe2df46e8 | 1 | 24 | 112 | 24 '- [0] org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreConcurrentLinkedDequeManagedConnectionPool @ 0xe2df4700| 1 | 88 | 112 | 1,416 '- mcf org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory @ 0xe1dd6ec8 | 1 | 216 | 112 | 776 '- originalTCCL org.jboss.modules.ModuleClassLoader @ 0xe27d0380 | 1 | 88 | 112 | 125,760 '- transformer org.jboss.modules.JLIClassTransformer @ 0xe2804560 | 1 | 16 | 112 | 152 '- transformer org.jboss.as.server.deployment.module.DelegatingClassFileTransformer @ 0xe2804570 | 1 | 24 | 112 | 136 '- delegateTransformers java.util.concurrent.CopyOnWriteArrayList @ 0xe2804588 | 1 | 24 | 112 | 112 '- array java.lang.Object[1] @ 0xe28045d0 | 1 | 24 | 112 | 40 '- [0] org.jboss.as.jpa.classloader.JPADelegatingClassFileTransformer @ 0xe28045e8 | 1 | 16 | 112 | 16 '- persistenceUnitMetadata org.jboss.as.jpa.config.PersistenceUnitMetadataImpl @ 0xe28045f8 | 1 | 112 | 112 | 9,208 --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- {code} Let me know if you see the same or something different. -- This message was sent by Atlassian Jira (v7.13.8#713008)