Create a directory /tmp/files for overlay Start JBoss EAP 7.0.5 or later Deploy an web app having <overlay> setting in jboss-web.xml <?xml version= "1.0" encoding= "UTF-8" ?> <jboss-web xmlns= "http: //www.jboss.com/xml/ns/javaee" xmlns:xsi= "http: //www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation= "http: //www.jboss.com/xml/ns/javaee http://www.jboss.org/j2ee/schema/jboss-web_10_0.xsd" version= "10.0" > <overlay>/tmp/files/</overlay> </jboss-web> echo 'aaa' > /tmp/files/aaa.txt curl -v http://localhost:8080/example/aaa.txt aaa is displayed -> correct echo 'edited' > /tmp/files/aaa.txt curl -v http://localhost:8080/example/aaa.txt edited is displayed -> correct echo 'edited2' > /tmp/files/aaa.txt curl -v http://localhost:8080/example/aaa.txt edit is displayed -> wrong edited2 should be displayed but it looks truncated