java.sql.ResultSetMetaData.columnNullable が取得できない

irb(main):001:0> java.sql.ResultSetMetaData::columnNullable
NoMethodError: undefined method `columnNullable' for Java::JavaSql::ResultSetMetaData:Module
	from (irb):2:in `binding'
irb(main):002:0> java.sql.ResultSetMetaData::ColumnNullable
NameError: uninitialized constant Java::JavaSql::ResultSetMetaData::ColumnNullable
	from (irb):3:in `const_missing'
	from (irb):3:in `binding'
irb(main):003:0> java.sql.ResultSetMetaData::Column_Nullable
NameError: uninitialized constant Java::JavaSql::ResultSetMetaData::Column_Nullable
	from (irb):4:in `const_missing'
	from (irb):4:in `binding'
irb(main):004:0> java.sql.ResultSetMetaData::column_Nullable
NoMethodError: undefined method `column_Nullable' for Java::JavaSql::ResultSetMetaData:Module
	from (irb):5:in `binding'
irb(main):005:0> java.sql.ResultSetMetaData.column_Nullable 
NoMethodError: undefined method `column_Nullable' for Java::JavaSql::ResultSetMetaData:Module
	from (irb):6:in `binding'
irb(main):006:0> java.sql.ResultSetMetaData.columnNullable 
NoMethodError: undefined method `columnNullable' for Java::JavaSql::ResultSetMetaData:Module
	from (irb):7:in `binding'
irb(main):007:0> java.sql.ResultSetMetaData.constants      
=> []

java.sql.ResultSetMetaData.columnNullable をjrubyで取得しようと思ったらとれなくて、java.sql.ResultSetMetaData.constantsを見たら空っぽだった。泣。