not worked with jupyter notebook

[pistol-gao]

'jupyter console --kernel=java' works fine with me. installed with newest version(from git)
when I choose the java kernel,the notebook shows kernel error,the error log is here:
Traceback (most recent call last):
File "/usr/local/lib/python3.6/dist-packages/tornado/web.py", line 1592, in _execute
result = yield result
File "/usr/local/lib/python3.6/dist-packages/tornado/gen.py", line 1133, in run
value = future.result()
File "/usr/local/lib/python3.6/dist-packages/tornado/gen.py", line 1141, in run
yielded = self.gen.throw(*exc_info)
File "/usr/local/lib/python3.6/dist-packages/notebook/services/sessions/handlers.py", line 73, in post
type=mtype))
File "/usr/local/lib/python3.6/dist-packages/tornado/gen.py", line 1133, in run
value = future.result()
File "/usr/local/lib/python3.6/dist-packages/tornado/gen.py", line 1141, in run
yielded = self.gen.throw(*exc_info)
File "/usr/local/lib/python3.6/dist-packages/notebook/services/sessions/sessionmanager.py", line 79, in create_session
kernel_id = yield self.start_kernel_for_session(session_id, path, name, type, kernel_name)
File "/usr/local/lib/python3.6/dist-packages/tornado/gen.py", line 1133, in run
value = future.result()
File "/usr/local/lib/python3.6/dist-packages/tornado/gen.py", line 1141, in run
yielded = self.gen.throw(*exc_info)
File "/usr/local/lib/python3.6/dist-packages/notebook/services/sessions/sessionmanager.py", line 92, in start_kernel_for_session
self.kernel_manager.start_kernel(path=kernel_path, kernel_name=kernel_name)
File "/usr/local/lib/python3.6/dist-packages/tornado/gen.py", line 1133, in run
value = future.result()
File "/usr/local/lib/python3.6/dist-packages/tornado/gen.py", line 326, in wrapper
yielded = next(result)
File "/usr/local/lib/python3.6/dist-packages/notebook/services/kernels/kernelmanager.py", line 160, in start_kernel
super(MappingKernelManager, self).start_kernel(**kwargs)
File "/usr/local/lib/python3.6/dist-packages/jupyter_client/multikernelmanager.py", line 110, in start_kernel
km.start_kernel(**kwargs)
File "/usr/local/lib/python3.6/dist-packages/jupyter_client/manager.py", line 259, in start_kernel
**kw)
File "/usr/local/lib/python3.6/dist-packages/jupyter_client/manager.py", line 204, in _launch_kernel
return launch_kernel(kernel_cmd, **kw)
File "/usr/local/lib/python3.6/dist-packages/jupyter_client/launcher.py", line 128, in launch_kernel
proc = Popen(cmd, **kwargs)
File "/usr/lib/python3.6/subprocess.py", line 709, in init
restore_signals, start_new_session)
File "/usr/lib/python3.6/subprocess.py", line 1344, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'java': 'java'

and my env is here:
system: Ubuntu 18.04.1 LTS
java :java version "10.0.2" 2018-07-17

[SpencerPark]

Hi @pistol-gao, I see that you have resolved the issue which is great! Do you mind also adding a quick comment as to what the problem was (and/or how you fixed it) in case others run into the same one and find themselves here?

Thanks!