Sorry, the error does not seem to be in the ResultSet but instead in the Callable Statement, method execute().

java.lang.NullPointerException
at
org.postgresql.core.v3.SimpleParameterList.getV3Le ngth(SimpleParameterList.java:228)
at
org.postgresql.core.v3.QueryExecutorImpl.sendBind( QueryExecutorImpl.java:807)
at
org.postgresql.core.v3.QueryExecutorImpl.sendOneQu ery(QueryExecutorImpl.java:1052)
at
org.postgresql.core.v3.QueryExecutorImpl.sendQuery (QueryExecutorImpl.java:643)
at
org.postgresql.core.v3.QueryExecutorImpl.execute(Q ueryExecutorImpl.java:189)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.execut e(AbstractJdbc2Statement.java:452)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.execut eWithFlags(AbstractJdbc2Statement.java:351)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.execut e(AbstractJdbc2Statement.java:344)