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I try to call FSDirectory.open
FSDirectory.open(File.open('index', 'w+'))
NameError: no method 'open' for arguments (org.jruby.RubyFile) on Java::OrgApacheLuceneStore::FSDirectory
String gives a similar error.
FSDirectory.open takes a java.io.File, which has no real equivalent in Ruby. Ruby’s “File” represents an open file, while java.io.File simply represents a path. You should just use java.io.File in this case.