Register a PostgreSQL XA datasource in JBoss configuration XML. Then create two heap dumps with interval > 2 minutes, XARecoveryModule._xidScans will grow without any limits. <xa-datasource jndi-name= "java:/datasources/Test" pool-name= "Test" enabled= " true " use-ccm= " false " > <xa-datasource-property name= "ServerName" >server</xa-datasource-property> <xa-datasource-property name= "DatabaseName" >database</xa-datasource-property> <driver>postgresql</driver> <xa-pool> <is-same-rm-override> false </is-same-rm-override> <interleaving> false </interleaving> <pad-xid> false </pad-xid> <wrap-xa-resource> false </wrap-xa-resource> </xa-pool> <security> <user-name>user</user-name> <password>password</password> </security> <validation> <valid-connection-checker class- name= "org.jboss.jca.adapters.jdbc.extensions.postgres.PostgreSQLValidConnectionChecker" /> <validate-on-match> false </validate-on-match> <background-validation> false </background-validation> <exception-sorter class- name= "org.jboss.jca.adapters.jdbc.extensions.postgres.PostgreSQLExceptionSorter" /> </validation> <statement> <share-prepared-statements> false </share-prepared-statements> </statement> </xa-datasource>