About this problem , I debuged it. The code  that in org.jboss.modules.Module.java is executed.

        log.trace("Attempting to find all resources %s in %s", canonPath, this);

        final String path = pathOf(canonPath);

        final Map<String, List<LocalLoader>> paths = getPathsUnchecked(exportsOnly);

        final List<LocalLoader> loaders = paths.get(path);

META-INF/seam.properties is searched, "path" variable's value is "META-INF". 

There are only application's module class loaders in "loaders" list, liking:

        local loader for ModuleClassLoader for Module "deployment.XXXX.ear.XXXX.war:main" from Service Module Loader

        local loader for ModuleClassLoader for Module "deployment.XXXX.ear:main" from Service Module Loader

        local loader for ModuleClassLoader for Module "deployment.XXXX.ear.YYYY.jar:main" from Service Module Loader

        local loader for ModuleClassLoader for Module "deployment.XXXX.ear.jboss-seam.jar:main" from Service Module Loader

Other module class loader are not exist.So, must jar files that include META-INF/seam.properties  be place in inside of application?

In jboss-deployment-structure.xml file, add "META-INF"'s setting, this problem is resolved.

META-INF/seam.properties can be searched, but the flowwing error occured.Liking https://community.jboss.org/thread/196955

java.lang.IllegalArgumentException: Null path

        at org.jboss.vfs.VFS.getChild(VFS.java:187) [jboss-vfs-3.1.0.Final.jar:3.1.0.Final]

        at org.jboss.vfs.VFS.getChild(VFS.java:173) [jboss-vfs-3.1.0.Final.jar:3.1.0.Final]

        at org.jboss.vfs.VFS.getChild(VFS.java:154) [jboss-vfs-3.1.0.Final.jar:3.1.0.Final]

        at org.jboss.seam.integration.jbossas.vfs.VFSScanner.getRoot(VFSScanner.java:36) [jboss-seam-int.jar:6.0.0.GA]

        at org.jboss.seam.integration.jbossas.vfs.VFSScanner.scanResources(VFSScanner.java:114) [jboss-seam-int.jar:6.0.0.GA]