buf_leak_test3.py

from jpype import *
import time

remote_pack = "c:/tools/netbeean-remote-pack"

profiler_options = [
    "-agentpath:%s/lib/deployed/jdk15/windows/profilerinterface.dll=%s/lib,5140" % (remote_pack, remote_pack)
]


options = [
    # '-verbose:gc',
    '-Xmx64m',
    '-Djava.class.path=classes'
]  # + profiler_options

cnt = 0

# setUsePythonThreadForDeamon(True)
startJVM(getDefaultJVMPath(), *options)


class MyStr(str):
    def __init__(self, val):
        str.__init__(self, val)
        global cnt
        cnt += 1
        print 'created string', cnt

    def __del__(self):
        global cnt
        cnt -= 1
        print 'deleted string', cnt


receive = JClass("jpype.nio.NioReceive")

while True:
    # everything runs great with this line uncommented
    #p = JString('5' * 1024 * 1024)

    # with this line uncommented, the python strings aren't GC'd
    p = java.lang.StringBuffer(MyStr('5' * 1024 * 1024))

    # with this line uncommented, the JVM throws an OutOfMemoryError (not GC'ing the proxied java objects?),
    # but the python strings are being GC'd
    #p = java.lang.StringBuffer(JString(MyStr('5' * 1024 * 1024)))

    #
    # forget the direct buffer for now....
    #
    buf = nio.convertToDirectBuffer(MyStr('5' * 1024 * 1024 * 5))
    try:
        receive.receiveBufferWithException(buf)
    except:
        pass