Solr Beans (Invalid setter method. Must have one and only one parameter) without any reason?

Solr Beans (Invalid setter method. Must have one and only one parameter)
without any reason?

References

Reference NO 1

http://stackoverflow.com/questions/15204380/solr-beans-invalid-setter-method-must-have-one-and-only-one-parameter-without

Reference NO 2

http://stackoverflow.com/questions/5797721/is-it-must-to-use-parameters-in-setter-methods

Reference NO 3

http://wiki.apache.org/solr/Solrj

Reference NO 4

http://developer.edina.ac.uk/projects/general/wiki/General_Tapestry_tips

Reference NO 5

http://forum.springsource.org/archive/index.php/t-113583.html

Reference NO 6

http://grepcode.com/file/repo1.maven.org/maven2/org.apache.solr/solr-solrj/4.1.0/org/apache/solr/client/solrj/impl/HttpSolrServer.java

Reference NO 7

http://www.pixelmonkey.org/2011/04/09/groovy-the-python-of-java

Reference NO 8

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