SolrJ 4.0.0 not serializing multilple filter queries correctly

Using multiple filter queries in a solrQuery causes an exception with the following details.

org.apache.solr.common.SolrException: org.apache.lucene.queryparser.classic.ParseException: Cannot parse '[Ljava.lang.String;@1ec278b5': Encountered "<EOF>" at line 1, column 28.
Was expecting one of:
"TO" ...
<RANGE_QUOTED> ...
<RANGE_GOOP> ...

The issues come up when using addFilterQuery() in the following manner:

solrQuery.addFilterQuery("

{!field f=facet_state}CA");
solrQuery.addFilterQuery("{!field f=facet_city}Test City");

or using it in the following way

solrQuery.setFilterQueries("{!field f=facet_state}

CA", "

{!field f=facet_city}Test City");
solrQuery.addFilterQuery("{!field f=facet_state}CA", "{!field f=facet_city}

Test City");

even if solrQuery.add() is used the issue still comes up

solrQuery.add("fq", "your first filter");
solrQuery.add("fq", "your second filter");

In any case having multiple filter queries causes the issue.

It seems that SolrJ is serializing a String[] instead of the separate String values. ModifiableSolrParams.java add() might be a good place to start the investigations.

Thanks.