使用带有jpype的自定义java类:包不是可调用的错误
题
我正在尝试获得一个非常简单的使用jpype的示例(版本: 0.5.4.6)从Python中实例化自定义Java类。它 松散地说明一个例子: http://hustleplay.wordpress.com/2010/02/18/jpype -tutorial / ,是 相关: jpype headaches
这是python代码(在/users/me/jpypeTest/testjpype.py中):
from jpype import *
cpopt="-Djava.class.path=%s" % ("/Users/me/jpypeTest")
startJVM(getDefaultJVMPath(),"-ea",cpopt)
print "JVM path:",getDefaultJVMPath()
print "classpath:",cpopt
java.lang.System.out.println("Hello World!!")
testPkg = JPackage('pkg')
Test = testPkg.Test
Test.speak("hi")
shutdownJVM()
.
和这里是Java代码(在/users/me/jpypetest/pkg/test.java中):
package pkg;
public class Test {
private String msg;
public Test() {
msg = "nothing so far...";
}
public static void speak(String msg) {
System.out.println(msg);
}
}
.
使用:
编译javac Test.java
.
要生成/users/me/jpypetest/pkg/test.class没有错误 (我还尝试在工作目录中施加测试)
运行Python代码给出:
> python testjpype.py
JVM path: /System/Library/Frameworks/JavaVM.framework/JavaVM
classpath: -Djava.class.path=/Users/me/jpypeTest
Hello World!!
Traceback (most recent call last):
File "testjpype.py", line 9, in <module>
Test.speak("hi")
File "/Users/me/dev/lib/python2.7/site-packages/jpype/_jpackage.py", line 53, in __call__
raise TypeError, "Package "+self.__name+" is not Callable"
TypeError: Package pkg.Test.speak is not Callable
.
系统是一个运行mavericks的mac:
> java -version
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)
> javac -version
javac 1.7.0_45
> python --version
Python 2.7.5
> python -c 'import sys;print("%x" % sys.maxsize, sys.maxsize > 2**32)'
('7fffffffffffffff', True)
.
列出导入的Java类的JPype方法也非常有用
非常感谢您看这个!
解决方案
此问题似乎是访问JPackage类的属性返回JPackage类,当您真正想要的是JClass。将testjypypy.py更改为此,为我工作:
from jpype import *
cpopt="-Djava.class.path=%s" % ("/Users/me/jpypeTest")
startJVM(getDefaultJVMPath(),"-ea",cpopt)
java.lang.System.out.println("Hello World!!")
Test = JClass('pkg.Test')
Test.speak("hi")
shutdownJVM()
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