compile-jruby:
    [javac] Compiling 400 source files to /home/pouype/sandbox/jruby/build/classes/jruby
    [javac] /home/pouype/sandbox/jruby/src/org/jruby/demo/TextAreaReadline.java:158: cannot find symbol
    [javac] symbol  : method isEmpty()
    [javac] location: class java.lang.String
    [javac]                 if (!line.isEmpty()) {
    [javac]                          ^
    [javac] /home/pouype/sandbox/jruby/src/org/jruby/demo/TextAreaReadline.java:509: cannot find symbol
    [javac] symbol  : constructor IOException(java.lang.InterruptedException)
    [javac] location: class java.io.IOException
    [javac]                 throw new IOException(e);
    [javac]                       ^
    [javac] /home/pouype/sandbox/jruby/src/org/jruby/demo/TextAreaReadline.java:548: cannot find symbol
    [javac] symbol  : constructor IOException(java.lang.InterruptedException)
    [javac] location: class java.io.IOException
    [javac]                 throw new IOException(e);
    [javac]                       ^
    [javac] Note: Some input files use unchecked or unsafe operations.
    [javac] Note: Recompile with -Xlint:unchecked for details.
    [javac] 3 errors

BUILD FAILED
/home/pouype/sandbox/jruby/build.xml:290: The following error occurred while executing this line:
/home/pouype/sandbox/jruby/build.xml:185: The following error occurred while executing this line:
/home/pouype/sandbox/jruby/build.xml:142: Compile failed; see the compiler error output for details.