Python Jython Mule ArrayList序列化

我使用Python组件返回employee对象的数组列表 我收到以下错误消息。我能够从数据库中得到结果，问题似乎在员工数组列表序列化中。任何帮助都将不胜感激

Infinite recursion (StackOverflowError) (through reference chain: org.python.core.PyType["base"]->org.python.core.PyNone["type"]-> Infinite recursion (StackOverflowError) (through reference chain: org.python.core.PyType["base"]->org.python.core.PyNone["type"]->org.python.core.PyType["base"]->org.python.core.PyType["base"]->org.python.core.PyType["base"]->org.python.core.PyNone[...******************************************************************************** Root Exception stack trace: java.lang.StackOverflowError

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OOC为什么要使用Python脚本连接数据库，而不是在Mule级别进行连接？在代码中隐藏Mule在配置级别所能做的事情通常是一种不好的做法。David只是一个如何使用Python组件返回集合的实验。感谢精度：）

employees = ArrayList()
class Employee:
    def __init__(self, empid, username):
        self.empid = empid
        self.username = username



Class.forName("oracle.jdbc.driver.OracleDriver");
connection = DriverManager.getConnection("", "", "")
statement = connection.createStatement()
resultSet = statement.executeQuery("select * from xyz" + " where USER_EMPLOYEE_ID = '" + payload + "'");
while resultSet.next():
    print "%s (%s)" % (resultSet.getString(1), resultSet.getString(2))
    emp = Employee(resultSet.getString(1), resultSet.getString(2))
    System.out.println(" Employee Details " + emp.empid)
    employees.add(emp)
print type(employees)   
result = employees