assertNotNull(json_obj);
// System.err.println(json_obj.toString(2));
ParameterMapping clone = new ParameterMapping();
clone.fromJSON(json_obj, catalog_db);
this.examineCorrelation(clone);
assertEquals(this.correlation.getStatement(), clone.getStatement());
assertEquals(this.correlation.getStatementIndex(), clone.getStatementIndex());
assertEquals(this.correlation.getStmtParameter(), clone.getStmtParameter());