Memory leak caused by org.eclipse.yasson.internal.JsonBinding ------------------------------------------------------------- Key: WFLY-13790 URL: https://issues.redhat.com/browse/WFLY-13790 Project: WildFly Issue Type: Bug Components: REST Affects Versions: 20.0.1.Final Reporter: Ahcene Kessal Assignee: r searls Priority: Major org.eclipse.yasson.internal.JsonBinding keeps a reference on an enum after the war is undeployed which results in a classloader leak. 1- Deploy the following application:   {code:java} package au.com.spatiumxl.model; public class Book { public enum Status { READ, UNREAD } private String title; private Book.Status status; public Book(String title) { this.title = title; this.status = Book.Status.UNREAD; } public String getTitle() { return title; } public Book.Status getStatus() { return status; } } {code}   {code:java} package au.com.spatiumxl.ejb; [...] import au.com.spatiumxl.model.Book; @Stateless @LocalBean public class BookService { public List<Book> getBooks() { List<Book> books = new ArrayList<>(); books.add(new Book("title1")); return books; } } {code}   {code:java} package au.com.spatiumxl.rest; [...] import au.com.spatiumxl.ejb.BookService; import au.com.spatiumxl.model.Book; @RequestScoped @Path("")public class BookEndPoint { @Inject BookService bookService; @GET @Path("/get-books") @Produces("application/json") public List<Book> getBooks() { return bookService.getBooks(); } } {code}   2- On the browser go to: http://<host>/<context-root>/.../get-books 3- Undeploy the war 4- The memory analyser shows: {code:java} java.lang.Thread org.jboss.modules.ModuleClassLoader org.jboss.modules.Module org.jboss.modules.LocalModuleLoader java.util.concurrent.ConcurrentHashMap java.util.concurrent.ConcurrentHashMap$Node[] java.util.concurrent.ConcurrentHashMap$Node org.jboss.modules.ModuleLoader$FutureModule org.jboss.modules.Module org.jboss.modules.ModuleClassLoader java.util.Vector java.lang.Object[] org.jboss.resteasy.plugins.providers.jsonb.AbstractJsonBindingProvider org.eclipse.yasson.internal.JsonBinding org.eclipse.yasson.internal.JsonbContext org.eclipse.yasson.internal.MappingContext java.util.concurrent.ConcurrentHashMap java.util.concurrent.ConcurrentHashMap$Node[] java.util.concurrent.ConcurrentHashMap$Node org.eclipse.yasson.internal.model.ClassModel org.eclipse.yasson.internal.model.PropertyModel[] org.eclipse.yasson.internal.model.PropertyModel au.com.spatiumxl.model.Book$Status {code}