rake compile

chamila@chamila:~/GSoC/2015/fib/fibs$ rake compile
javac -extdirs "/usr/lib/jvm/java-7-oracle/jre/lib/ext:/usr/java/packages/lib/ext" -target 1.5 -source 1.5 -Xlint:unchecked  -cp "/usr/lib/jvm/java-7-oracle/jre/lib/resources.jar:/usr/lib/jvm/java-7-oracle/jre/lib/rt.jar:/usr/lib/jvm/java-7-oracle/jre/lib/sunrsasign.jar:/usr/lib/jvm/java-7-oracle/jre/lib/jsse.jar:/usr/lib/jvm/java-7-oracle/jre/lib/jce.jar:/usr/lib/jvm/java-7-oracle/jre/lib/charsets.jar:/usr/lib/jvm/java-7-oracle/jre/lib/jfr.jar:/usr/lib/jvm/java-7-oracle/jre/classes:/usr/share/rvm/rubies/jruby-1.7.19/lib/jruby.jar:" -d tmp/java/fibs 
javac: no source files
Usage: javac <options> <source files>
use -help for a list of possible options
rake aborted!
Command failed with status (2): [javac -extdirs "/usr/lib/jvm/java-7-oracle...]
org/jruby/RubyProc.java:271:in `call'
/home/chamila/.rvm/gems/jruby-1.7.19/gems/rake-compiler-0.9.5/lib/rake/javaextensiontask.rb:98:in `define_compile_tasks'
org/jruby/RubyProc.java:271:in `call'
org/jruby/RubyArray.java:1613:in `each'
org/jruby/RubyArray.java:1613:in `each'
org/jruby/RubyArray.java:1613:in `each'
org/jruby/RubyArray.java:1613:in `each'
org/jruby/RubyArray.java:1613:in `each'
org/jruby/RubyArray.java:1613:in `each'
org/jruby/RubyArray.java:1613:in `each'
org/jruby/RubyKernel.java:1087:in `load'
org/jruby/RubyKernel.java:1107:in `eval'
/home/chamila/.rvm/gems/jruby-1.7.19/bin/jruby_executable_hooks:15:in `(root)'
Tasks: TOP => compile => compile:java => compile:fibs:java => copy:fibs:java => tmp/java/fibs/fibs.jar => tmp/java/fibs/.build
(See full trace by running task with --trace)