How to bind ports below 1024 with non-root privilege

Issue

• When a process calls a bind() system call, the bind() returns error with EACCESS.
• Why is a "Permission denied" error received when trying to open TCP ports under 1024?
• How can a normal user bind ports below 1024?
• How do can JBoss bind to port 443
• How to configure/bind JBoss web container HTTPS to port 443 running as a non-root user?
• How to configure JBoss so that the application can be accessed on default port 443 and internally it should be forwarded to some other port ?

• Following kind of error is seen in JBoss server.log when tried to run on port lesser than 1024, for example on 443 :

  17:56:09,044 ERROR [Http11AprProtocol] Error initializing endpoint
  java.lang.Exception: Socket bind failed: [13] Permission denied
      at org.apache.tomcat.util.net.AprEndpoint.init(AprEndpoint.java:610)
      at org.apache.coyote.http11.Http11AprProtocol.init(Http11AprProtocol.java:107)
  ...
  ...
  17:56:09,047 ERROR [AbstractKernelController] Error installing to Start: name=WebServer state=Create
  LifecycleException:  Protocol handler initialization failed: java.lang.Exception: Socket bind failed: [13] Permission denied
      at org.apache.catalina.connector.Connector.initialize(Connector.java:1031)
      at org.apache.catalina.core.StandardService.initialize(StandardService.java:683)
      at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:821)