Logstash系列： 多行匹配

Exception in thread "main" java.lang.NullPointerException
        at com.example.myproject.Book.getTitle(Book.java:16)
        at com.example.myproject.Author.getBookTitles(Author.java:25)
        at com.example.myproject.Bootstrap.main(Bootstrap.java:14)

input {
  stdin {
    codec => multiline {
      pattern => "^\s"
      what => "previous"
    }
  }
}

printf ("%10.10ld  \t %10.10ld \t %s\
  %f", w, x, y, z );

input {
  stdin {
    codec => multiline {
      pattern => "\\$"
      what => "next"
    }
  }
}

[2015-08-24 11:49:14,389][INFO ][env                      ] [Letha] using [1] data paths, mounts [[/
(/dev/disk1)]], net usable_space [34.5gb], net total_space [118.9gb], types [hfs]

i

nput {
  file {
    path => "/var/log/someapp.log"
    codec => multiline {
      pattern => "^%{TIMESTAMP_ISO8601} "
      negate => true
      what => previous
    }
  }
}