Try just getting it ourselves

packages/py-spinnfrontendcommon/package.py

@@ -7,10 +7,12 @@ from spack.package import *
 from spack.fetch_strategy import URLFetchStrategy
 from spack.store import find
 from llnl.util import tty
+from os import makedirs
+from urllib.request import urlretrieve
 import os
 
+
 _JAR_URL = "https://github.com/SpiNNakerManchester/JavaSpiNNaker/releases/download/7.0.0/spinnaker-exe.jar"
-_JAR_SHA256 = "2d909c7fb3aa15886acf26febb1bd48e25db0c347a231944aa6a5f86107bb55b"
 
 class PySpinnfrontendcommon(PythonPackage):
     """This package provides utilities for specifying binary data
@@ -19,8 +21,6 @@ class PySpinnfrontendcommon(PythonPackage):
     homepage = "https://github.com/SpiNNakerManchester/SpiNNFrontEndCommon"
     pypi = "SpiNNFrontEndCommon/SpiNNFrontEndCommon-1!7.0.0.tar.gz"
 
-    resource(name="spinnaker-exe.jar", url=_JAR_URL, checksum=_JAR_SHA256, expand=False, destination="JavaSpiNNaker/SpiNNaker-front-end/target")
-
     version("7.0.0", sha256="07539734ed0105472d06d655bbd92e149ef44c77c388fcca28857558faa6dd10")
 
     depends_on("python@3.7:", type=("build", "run"))
@@ -40,8 +40,12 @@ class PySpinnfrontendcommon(PythonPackage):
         python_spec = find("python@3.7:")[0]
         python_version = ".".join(str(v) for v in python_spec.version.version[0:2])
         python_lib = f"python{python_version}"
-        site_packages = prefix.lib.join(python_lib).site_packages
-        install_tree("JavaSpiNNaker", site_packages.JavaSpiNNaker)
+        site_packages = prefix.lib.join(python_lib).join("site-packages")
+        java_folder = site_packages.JavaSpiNNaker.join("SpiNNaker-front-end").target
+        java_exe = java_folder.join("spinnaker-exe.jar")
+        makedirs(java_folder)
+        urlretrieve(_JAR_URL, java_exe)
+        tty.debug(f"Received {java_exe} from {_JAR_URL}")
 
         # Test where things are now installed
         tty.debug(f"Checking contents of {prefix}")