Description
When the property 'log4j.appender.out.file' is missed in the file org.ops4j.pax.logging.cfg, a NPE is raised.
java.lang.NullPointerException
at org.apache.karaf.main.Main.substVars(Main.java:1187)
at org.apache.karaf.main.BootstrapLogManager.getDefaultHandler(BootstrapLogManager.java:68)
at org.apache.karaf.main.Main.launch(Main.java:232)
at org.apache.karaf.main.Main.main(Main.java:426)