error messages from json/decoder.py ?

[chi-hung]

After excuting:

jupyter console --kernel java

I've got the following error messages. Something wrong?

Traceback (most recent call last):
File "/usr/local/bin/jupyter-console", line 11, in
sys.exit(main())
File "/usr/local/lib/python2.7/site-packages/jupyter_core/application.py", line 267, in launch_instance
return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
File "/usr/local/lib/python2.7/site-packages/traitlets/config/application.py", line 657, in launch_instance
app.initialize(argue
File "", line 2, in initialize
File "/usr/local/lib/python2.7/site-packages/traitlets/config/application.py", line 87, in catch_config_error
return method(app, _args, *_kwargs)
File "/usr/local/lib/python2.7/site-packages/jupyter_console/app.py", line 137, in initialize
self.init_shell()
File "/usr/local/lib/python2.7/site-packages/jupyter_console/app.py", line 105, in init_shell
JupyterConsoleApp.initialize(self)
File "/usr/local/lib/python2.7/site-packages/jupyter_client/consoleapp.py", line 334, in initialize
self.init_kernel_manager()
File "/usr/local/lib/python2.7/site-packages/jupyter_client/consoleapp.py", line 288, in init_kernel_manager
self.kernel_manager.start_kernel(**kwargs)
File "/usr/local/lib/python2.7/site-packages/jupyter_client/manager.py", line 230, in start_kernel
kernel_cmd = self.format_kernel_cmd(extra_arguments=extra_arguments)
File "/usr/local/lib/python2.7/site-packages/jupyter_client/manager.py", line 170, in format_kernel_cmd
cmd = self.kernel_spec.argv + extra_arguments
File "/usr/local/lib/python2.7/site-packages/jupyter_client/manager.py", line 82, in kernel_spec
self._kernel_spec = self.kernel_spec_manager.get_kernel_spec(self.kernel_name)
File "/usr/local/lib/python2.7/site-packages/jupyter_client/kernelspec.py", line 177, in get_kernel_spec
return self._get_kernel_spec_by_name(kernel_name, resource_dir)
File "/usr/local/lib/python2.7/site-packages/jupyter_client/kernelspec.py", line 164, in _get_kernel_spec_by_name
return self.kernel_spec_class.from_resource_dir(resource_dir)
File "/usr/local/lib/python2.7/site-packages/jupyter_client/kernelspec.py", line 38, in from_resource_dir
kernel_dict = json.load(f)
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/init.py", line 291, in load
**kw)
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/init.py", line 339, in loads
return _default_decoder.decode(s)
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/decoder.py", line 364, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/decoder.py", line 380, in raw_decode
obj, end = self.scan_once(s, idx)
ValueError: Expecting ',' delimiter: line 6 column 2 (char 137))

[Bachmann1234]

Can you post your kernal config json? That error suggests there is an error in parsing that file. Looks like a comma missing.

[chi-hung]

Here it is. Sorry for the late reply. By the way, in order to see if jshell works, I switched to java9 and typed java -jar kulla.jar in terminal. I find out that the jshell can start and I can do some basic stuffs interactively without problem. So, could it be something wrong between Python and the java kernel?

  1 { 
  2  "argv": ["python3", "/Users/chweng/javakernel",
  3           "-f", "{connection_file}"],
  4  "display_name": "Java 9",
  5  "language": "java"
  6  "env" : {
  7      "JAVA_9_HOME": "/Library/Java/JavaVirtualMachines/jdk-9.jdk/Contents/Home",
  8      "KULLA_HOME": "/Users/chweng/kulla/kulla.jar"
  9      }   
 10 } 

[chi-hung]

uh..., you are right. There's a comma missing at line 5. Now, the following is my new kernel config. (I wasn't sure if it is necessary to add the -f {connection file}?)

  1 {
  2  "argv": ["python3", "/Users/chweng/javakernel"],
  3  "display_name": "Java 9",
  4  "language": "java",
  5  "env" : {
  6      "JAVA_9_HOME": "/Library/Java/JavaVirtualMachines/jdk-9.jdk/Contents/Home",
  7      "KULLA_HOME": "/Users/chweng/kulla/kulla.jar"
  8      }
  9 }

Anyway, after typing

jupyter console --kernel java

I still get some error messages:

Traceback (most recent call last):
File "/usr/local/lib/python3.5/site-packages/jupyter_console/ptshell.py", line 302, in init_kernel_info
reply = self.client.get_shell_msg(timeout=1)
File "/usr/local/lib/python3.5/site-packages/jupyter_client/client.py", line 77, in get_shell_msg
return self.shell_channel.get_msg(_args, *_kwargs)
File "/usr/local/lib/python3.5/site-packages/jupyter_client/blocking/channels.py", line 57, in get_msg
raise Empty
queue.Empty

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/local/bin/jupyter-console", line 11, in
sys.exit(main())
File "/usr/local/lib/python3.5/site-packages/jupyter_core/application.py", line 267, in launch_instance
return super(JupyterApp, cls).launch_instance(argv=argv, *_kwargs)
File "/usr/local/lib/python3.5/site-packages/traitlets/config/application.py", line 657, in launch_instance
app.initialize(argue
File "", line 2, in initialize
File "/usr/local/lib/python3.5/site-packages/traitlets/config/application.py", line 87, in catch_config_error
return method(app, *args, *_kwargs)
File "/usr/local/lib/python3.5/site-packages/jupyter_console/app.py", line 137, in initialize
self.init_shell()
File "/usr/local/lib/python3.5/site-packages/jupyter_console/app.py", line 110, in init_shell
client=self.kernel_client,
File "/usr/local/lib/python3.5/site-packages/traitlets/config/configurable.py", line 412, in instance
inst = cls(_args, *_kwargs)
File "/usr/local/lib/python3.5/site-packages/jupyter_console/ptshell.py", line 251, in init
self.init_kernel_info()
File "/usr/local/lib/python3.5/site-packages/jupyter_console/ptshell.py", line 305, in init_kernel_info
raise RuntimeError("Kernel didn't respond to kernel_info_request")
RuntimeError: Kernel didn't respond to kernel_info_request)

It appeared that the kernel died somehow?

[Bachmann1234]

Yeah, I think the kernel is broken. Not sure why. Im thinking something changes in ipython but I am not likely going to be able to look into this for a while