用jython调用python脚本时出现的问题

在用jython调用python脚本时出现的问题：

ERROR 4208 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is SyntaxError] with root cause

org.python.core.PyException: null

下面是Java里调用部分的代码：

        PythonInterpreter interpreter = new PythonInterpreter();
        interpreter.execfile("E:\\test\\mypro.py");
        PyFunction pyFunction = interpreter.get("mypro", PyFunction.class);
        PyObject pyobj = pyFunction.__call__();
        System.out.println("the anwser is: " + pyobj);

mypro.py里的mypro这个函数不需要参数，但是有返回字符串，不知道哪里出问题了。

PythonInterpreter interpreter = new PythonInterpreter();
try {
    interpreter.execfile("E:\\test\\mypro.py");
    PyFunction pyFunction = interpreter.get("mypro", PyFunction.class);
    PyObject pyobj = pyFunction.__call__();
    System.out.println("the anwser is: " + pyobj);
} catch (PyException e) {
    System.out.println("Python error: " + e.toString());
    e.printStackTrace();
}