JUnpickler BufferOverflowException ByteBufferInputStream

[tachyonicClock]

When adding multiple java objects to a pickle a buffer overflow can occur. I believe this to be a bug related to native/java/org/jpype/pickle/ByteBufferInputStream.java specifically how it resizes after multiple puts.

import jpype
import jpype.imports
from jpype.pickle import JPickler, JUnpickler

if not jpype.isJVMStarted():
    jpype.startJVM(jpype.getDefaultJVMPath())

from java.lang import String


my_a = String('A' * 512)
my_b = String('B' * 512)

class PythonObject():

    def __init__(self, a, b):
        self.a = a
        self.b = b


with open('test.pkl', 'wb') as f:
    JPickler(f).dump(PythonObject(my_a, my_b))

try:
    with open('test.pkl', 'rb') as f:
        obj = JUnpickler(f).load()
except Exception as ex:
    print(ex.stacktrace())

java.nio.BufferOverflowException
	at java.base/java.nio.HeapByteBuffer.put(HeapByteBuffer.java:231)
	at java.base/java.nio.ByteBuffer.put(ByteBuffer.java:1210)
	at org.jpype.pickle.ByteBufferInputStream.put(Unknown Source)
	at org.jpype.pickle.Decoder.unpack(Unknown Source)