Configuring "org.ops4j.pax.logging" properties through JMX causing property placeholders to be replaced

1. start Fuse container; 2. login to hawtio web console, then invoke the following setProperty operation on Hawtio JMX Page: org.apache.karaf:type=config,name=root::setProperty(java.lang.String,java.lang.String,java.lang.String) P1: org.ops4j.pax.logging P2: log4j.appender.out.maxFileSize P3: 20MB 3. check container's "etc/org.ops4j.pax.logging.cfg" file: $ cat org.ops4j.pax.logging.cfg |grep log4j.appender.out.file log4j.appender.out.file = /apps/jboss/fuse/6.3/r8/orig/jboss-fuse-6.3.0.redhat-347/data/log/fuse.log $ cat org.ops4j.pax.logging.cfg |grep log4j.appender.sift.appender.file log4j.appender.sift.appender.file = /apps/jboss/fuse/6.3/r8/orig/jboss-fuse-6.3.0.redhat-347/data/log/${bundle.name}.log The file "etc/org.ops4j.pax.logging.cfg" entries "log4j.appender.sift.appender.file" and "log4j.appender.sift.appender.file" were changed. The property placeholder "${karaf.data}" was automatically replaced. And the other one $\\{bundle.name\\}" was changed to "${bundle.name}" as all of the escape characters '\' were removed. 4. invoke the same JMX operation setProperties again on a different property: P1: org.ops4j.pax.logging P2: log4j.appender.out.maxBackupIndex P3: 20 5. check container's "etc/org.ops4j.pax.logging.cfg" file again: $ cat org.ops4j.pax.logging.cfg |grep log4j.appender.out.file log4j.appender.out.file = /apps/jboss/fuse/6.3/r8/orig/jboss-fuse-6.3.0.redhat-347/data/log/fuse.log $ cat org.ops4j.pax.logging.cfg |grep log4j.appender.sift.appender.file log4j.appender.sift.appender.file = /apps/jboss/fuse/6.3/r8/orig/jboss-fuse-6.3.0.redhat-347/data/log/.log This time. the other property placeholder "${bundle.name}" was replaced with nothing because the property "bundle.name" does not have a value.