python - 通过 Java 网关链接 Netlogo 和 Python

Question

我试图使用 nl4py 通过 java 桥连接 Python 和 Netlogo。在尝试了此处描述的所有操作后，我不断收到错误消息:https://arxiv.org/pdf/1808.03292.pdf .我正在使用 MAC 和 python 2.7。

我也尝试过不使用 nl4py 并直接使用 py4j 手动完成。但是当我尝试调用 from py4j.Java_Gateway import Java_Gateway 时，我得到了错误:

Traceback (most recent call last):
  File "/Users/user/Desktop/Machines Model/pythonjavanetlogolink.py", line 1, in <module>
    from py4j.Java_Gateway import Java_Gateway
ImportError: No module named Java_Gateway'

import nl4py
import time

nl4py.startServer("/Users/user/Desktop/NetLogo610")

model = "/Users/user/Desktop/Machines Model/ABM4.nlogo"

nl4py.netlogoWorkspaceFactory.deleteAllExistingWorkspaces()

nl4py.netlogoWorkspaceFactory.newNetLogoHeadlessWorkspace()

for workspace in nl4py.netlogoWorkspaceFactory.getAllExistingWorkspaces():
    workspace.openModel(model)

nl4py.netlogoWorkspaceFactory.deleteAllExistingWorkspaces()

nl4py.stopServer()

Traceback (most recent call last):
  File "/Users/user/Desktop/Machines Model/python_link.py", line 13, in <module>
    workspace.openModel(model)
  File "/Library/Python/2.7/site-packages/nl4py/NetLogoHeadlessWorkspace.py", line 52, in openModel
    self.__bridge.openModel(self.__session,self.__path)
  File "/Library/Python/2.7/site-packages/py4j/java_gateway.py", line 1286, in __call__
    answer, self.gateway_client, self.target_id, self.name)
  File "/Library/Python/2.7/site-packages/py4j/protocol.py", line 328, in get_return_value
    format(target_id, ".", name), value)
py4j.protocol.Py4JJavaError: An error occurred while calling t.openModel.
: java.lang.NoSuchMethodError: org.nlogo.headless.HeadlessWorkspace.open(Ljava/lang/String;)V
    at nl4py.server.HeadlessWorkspaceController.openModel(HeadlessWorkspaceController.java:133)
    at nl4py.server.NetLogoControllerServer.openModel(NetLogoControllerServer.java:100)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)
    at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
    at py4j.Gateway.invoke(Gateway.java:282)
    at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
    at py4j.commands.CallCommand.execute(CallCommand.java:79)
    at py4j.GatewayConnection.run(GatewayConnection.java:214)
    at java.base/java.lang.Thread.run(Thread.java:835)

Answer 1

哇，我真的想放弃并决定尝试不同的 NetLogo 版本并且它成功了。因此，对于遇到相同/相似问题的任何人，请尝试在 NL 6.0.4 或更早版本上运行它。他们更改了最新版本中的一些目录，因此无法正常工作。