我在 Eclipse 中有以下 Java 文件。
package java_python_tutorial;
import org.python.core.PyInstance;
import org.python.util.PythonInterpreter;
public class MainJython {
public static void main(String[] args) {
PythonInterpreter python = new PythonInterpreter();
python.execfile("pytest/test_np.py");
// PyInstance test = (PyInstance) python.eval("Test()");
// test.invoke("printArr");
python.close();
}
}
如果我只包含 Jython JAR，运行该文件将导致ImportError: no module named numpy来自Python。我尝试通过在项目构建路径中包含 JyNI JAR 来解决此问题，但现在运行该文件会出现此错误：
Exception in thread "main" java.lang.NoClassDefFoundError: org/python/modules/_weakref/ReferenceBackendFactory
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
at java.lang.Class.getConstructor0(Class.java:3075)
at java.lang.Class.newInstance(Class.java:412)
at org.python.core.PySystemState.initialize(PySystemState.java:1015)
at org.python.core.PySystemState.initialize(PySystemState.java:947)
at org.python.core.PySystemState.initialize(PySystemState.java:930)
at org.python.core.PySystemState.initialize(PySystemState.java:925)
at org.python.core.PySystemState.initialize(PySystemState.java:920)
at org.python.core.PySystemState.initialize(PySystemState.java:916)
at org.python.core.ThreadStateMapping.getThreadState(ThreadStateMapping.java:32)
at org.python.core.Py.getThreadState(Py.java:1440)
at org.python.core.Py.getThreadState(Py.java:1436)
at org.python.core.Py.getSystemState(Py.java:1456)
at org.python.util.PythonInterpreter.<init>(PythonInterpreter.java:105)
at org.python.util.PythonInterpreter.<init>(PythonInterpreter.java:94)
at org.python.util.PythonInterpreter.<init>(PythonInterpreter.java:71)
at java_python_tutorial.MainJython.main(MainJython.java:7)
Caused by: java.lang.ClassNotFoundException: org.python.modules._weakref.ReferenceBackendFactory
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 18 more
作为参考，我调用的 Python 脚本的内容是：
import numpy as np
class TestNP(object):
def __init__(self):
self.arr = np.array([[1,2,3],[4,5,6]])
def printArr(self):
print(self.arr)
None
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