Accessing JVM from python

Question

>>> import boilerpipe
Traceback (most recent call last):
  File \"\", line 1, in 
  File \"C:\\Anaconda\\lib\\site-packages\\boil         


        

Answer 1

If you are trying to access JVM on Windows operation system, make sure you have the right version of JVM (32-bit or 64-bit) installed. In my case python was 64-bit and once I installed Java 64-bit, it worked without needing to specify the path or any other extra requirements.

Answer 2

Answering because I don't have enough rep for commenting; Try using raw strings instead of the normal ones allowing "\x" escapes. Try:

>>> ctypes.CDLL(r'C:\Program Files (x86)\Java\jre1.8.0_40\bin\client\jvm.dll')

Because the "\..." parts of the string could very well be escapes.

Answer 3

Check Please !

1. Give a true path ("C:\\Program Files\\Java\\jre7\\bin\client\\jvm.dll")
2. Check all 32 or 64 bit (my offer always use 32bit Anaconda,JRE7,Python etc.)
3. Install pywin32 (of course python2.7.9)
4. Give permission to jvm.dll(can run)
5. After all is ok, try: import ctypes ctypes.CDLL('C:\\Program Files\\Java\\jre7\\bin\\client\\jvm.dll')

***Maybe can't throw the hook of some java versions i used jre-7u55-windows-i586.exe

i hope helpful ! Best regards !

Works on wine(no bug):

Answer 4

The answers above are not sufficient, one also needs to install the Microsoft Visual C++ 2010 Redistributable Package (x86) as per Bjorns answer.

After installed the C++ redistributable:

1. Set JAVA_HOME environment variable to ("C:\Program Files\Java\jre7")

2. Use paths as mentioned above to start jvm:

   path_to_jvm = "C:\Program Files\Java\jre7\bin\client\jvm.dll"

   jpype.startJVM(path_to_jvm)

   jpype.startJVM(jpype.getDefaultJVMPath())