A bit more detail on this; I've replicated this bug. On macOS 10.14.6:

(python36) iMac-Pro:anserini jimmylin$ conda list | grep pyjnius
pyjnius                   1.2.0                     <pip>

The error I get is:

>>> from pyserini.search import pysearch
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "./src/main/python/pyserini/search/pysearch.py", line 21, in <module>
    from ..pyclass import JSearcher, JString, JArrayList
  File "./src/main/python/pyserini/pyclass.py", line 28, in <module>
    from jnius import autoclass, cast
  File "/anaconda3/envs/python36/lib/python3.6/site-packages/jnius/__init__.py", line 13, in <module>
    from .reflect import *  # noqa
  File "/anaconda3/envs/python36/lib/python3.6/site-packages/jnius/reflect.py", line 15, in <module>
    class Class(with_metaclass(MetaJavaClass, JavaClass)):
  File "/anaconda3/envs/python36/lib/python3.6/site-packages/six.py", line 827, in __new__
    return meta(name, bases, d)
  File "jnius/jnius_export_class.pxi", line 114, in jnius.MetaJavaClass.__new__
  File "jnius/jnius_export_class.pxi", line 164, in jnius.MetaJavaClass.resolve_class
  File "jnius/jnius_env.pxi", line 11, in jnius.get_jnienv
  File "jnius/jnius_jvm_dlopen.pxi", line 90, in jnius.get_platform_jnienv
  File "jnius/jnius_jvm_dlopen.pxi", line 59, in jnius.create_jnienv
SystemError: Error calling dlopen(b'/Library/Java/JavaVirtualMachines/jdk-11.0.4.jdk/Contents/Home/jre/lib/server/libjvm.dylib': b'dlopen(/Library/Java/JavaVirtualMachines/jdk-11.0.4.jdk/Contents/Home/jre/lib/server/libjvm.dylib, 10): image not found'

Issue is documented here.

Indeed, the lib has moved:

$ ls /Library/Java/JavaVirtualMachines/jdk-11.0.4.jdk/Contents/Home/lib/server/libjvm.dylib 
/Library/Java/JavaVirtualMachines/jdk-11.0.4.jdk/Contents/Home/lib/server/libjvm.dylib

So a (janky) symlink will fix the issue:

$ sudo mkdir -p /Library/Java/JavaVirtualMachines/jdk-11.0.4.jdk/Contents/Home/jre/lib/server/

$ ls /Library/Java/JavaVirtualMachines/jdk-11.0.4.jdk/Contents/Home/lib/server/libjvm.dylib 
/Library/Java/JavaVirtualMachines/jdk-11.0.4.jdk/Contents/Home/lib/server/libjvm.dylib

$ sudo ln -s /Library/Java/JavaVirtualMachines/jdk-11.0.4.jdk/Contents/Home/lib/server/libjvm.dylib /Library/Java/JavaVirtualMachines/jdk-11.0.4.jdk/Contents/Home/jre/lib/server/libjvm.dylib

Update to Java 11 breaks Pyserini #832

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