How to control the order of files returned from OS in Java / JBoss classloading?

Solution Unverified - Updated -

Issue

  • We have two identical Red Hat Enterprise Linux (RHEL) Linux systems and we deployed the same apps on both servers. But when the jar files were uploaded to the lib directory, the sequence or orders are inconsistent, leading to classloading issues.
  • Is there a way to control the order of class files returned by OS / RHEL?
  • Is there a setting in a filesystem that when files are written, they are ordered by their names or even by timestamp?
  • From the ls output below, the files are not ordered identically in same directory when using the same version of RHEL.

    • From host1:

      $ cat /etc/redhat-release
      Red Hat Enterprise Linux Server release 7.1 (Maipo)
      $ uname -a
      Linux host1 3.10.0-327.13.1.el7.ppc64le #1 SMP Mon Feb 29 13:22:06 EST 2016 ppc64le ppc64le ppc64le GNU/Linux
      $ pwd
      /path/to/MyApp.ear/MyWeb.war/WEB-INF/lib
      $ ls -U | grep spring
      spring-asm-3.0.4.RELEASE.jar
      spring-beans-3.0.4.RELEASE.jar
      aet-spring-2.0.2.jar
      spring-expression-3.0.4.RELEASE.jar
      spring-context-3.0.4.RELEASE.jar
      spring-core-3.0.4.RELEASE.jar
      spring-context-support-3.0.4.RELEASE.jar
      spring-aop-3.0.4.RELEASE.jar
      
    • From host2:

      $ cat /etc/redhat-release
      Red Hat Enterprise Linux Server release 7.1 (Maipo)
      $ uname -a
      Linux host2 3.10.0-327.13.1.el7.ppc64le #1 SMP Mon Feb 29 13:22:06 EST 2016 ppc64le ppc64le ppc64le GNU/Linux
      $ pwd
      /path/to/MyApp.ear/MyWeb.war/WEB-INF/lib
      $ ls -U | grep spring
      spring-context-support-3.0.4.RELEASE.jar
      spring-core-3.0.4.RELEASE.jar
      spring-asm-3.0.4.RELEASE.jar
      spring-context-3.0.4.RELEASE.jar
      spring-aop-3.0.4.RELEASE.jar
      spring-beans-3.0.4.RELEASE.jar
      aet-spring-2.0.2.jar
      spring-expression-3.0.4.RELEASE.jar
      

Environment

  • Red Hat Enterprise Linux (RHEL)
  • Red Hat JBoss Enterprise Application Platform (EAP)

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