jmol doesn't start in 10.5

[Richard Quint]

I have built Sage from source (sage-10.4.tar.gz and sage-10.5.tar.gz) on
four machines with different architectures and different derivatives of
Debian.  On all machines the jmol viewer for 3d plots works under 10.4
but not under 10.5.  The RuntimeError Traceback is identical on all
machines.  A copy of a Sage session is below. Except for the machine
specific info the Traceback is identical for each installation. As you
can see from the transcript, java is installed.  It is used by jmol in
10.4.  I don't know enough Python to see what the problem is.  Any help
would be appreciated.

┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 10.5, Release Date: 2024-12-04                    │
│ Using Python 3.12.7. Type "help()" for help.                       │
└────────────────────────────────────────────────────────────────────┘
sage: !uname -a
Linux Iphegenia 6.11.0-9-generic #9-Ubuntu SMP PREEMPT_DYNAMIC Mon Oct
14 13:19:59 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
sage: !lsb_release -d
Description:    Ubuntu 24.10
sage: !java --version
openjdk 21.0.5 2024-10-15
OpenJDK Runtime Environment (build 21.0.5+11-Ubuntu-1ubuntu124.10)
OpenJDK 64-Bit Server VM (build 21.0.5+11-Ubuntu-1ubuntu124.10, mixed
mode, sharing)
sage: var('x y')
(x, y)
sage: plot3d(x*y, (-1,1), (-1,1), viewer="jmol")
---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
Cell In[5], line 1
----> 1 plot3d(x*y, (-Integer(1),Integer(1)), (-Integer(1),Integer(1)),
viewer="jmol")

File
~/Sage/sage-10.5/local/var/lib/sage/venv-python3.12/lib/python3.12/site-packages/IPython/core/displayhook.py:268,
in DisplayHook.__call__(self, result)
    266 self.start_displayhook()
    267 self.write_output_prompt()
--> 268 format_dict, md_dict = self.compute_format_data(result)
    269 self.update_user_ns(result)
    270 self.fill_exec_result(result)

File
~/Sage/sage-10.5/local/var/lib/sage/venv-python3.12/lib/python3.12/site-packages/IPython/core/displayhook.py:157,
in DisplayHook.compute_format_data(self, result)
    127 def compute_format_data(self, result):
    128     """Compute format data of the object to be displayed.
    129
    130     The format data is a generalization of the :func:`repr` of
an object.
   (...)
    155
    156     """
--> 157     return self.shell.display_formatter.format(result)

File ~/Sage/sage-10.5/src/sage/repl/display/formatter.py:187, in
SageDisplayFormatter.format(self, obj, include, exclude)
    112 def format(self, obj, include=None, exclude=None):
    113     r"""
    114     Use the Sage rich output instead of IPython.
    115
   (...)
    185         I am repper
    186     """
--> 187     sage_format, sage_metadata = self.dm.displayhook(obj)
    188     assert PLAIN_TEXT in sage_format, 'plain text is always
present'
    190     # use Sage rich output for any except those native to
IPython, but only
    191     # if it is not plain and dull

File ~/Sage/sage-10.5/src/sage/repl/rich_output/display_manager.py:800,
in DisplayManager.displayhook(self, obj)
    798 self._backend.set_underscore_variable(obj)
    799 plain_text, rich_output = self._rich_output_formatter(obj, dict())
--> 800 return self._backend.displayhook(plain_text, rich_output)

File ~/Sage/sage-10.5/src/sage/repl/rich_output/backend_ipython.py:266,
in BackendIPythonCommandline.displayhook(self, plain_text, rich_output)
    264     return ({'text/plain': msg}, {})
    265 elif isinstance(rich_output, OutputSceneJmol):
--> 266     msg = self.launch_jmol(rich_output, plain_text.text.get_str())
    267     return ({'text/plain': msg}, {})
    268 elif isinstance(rich_output, OutputSceneWavefront):

File ~/Sage/sage-10.5/src/sage/repl/rich_output/backend_ipython.py:367,
in BackendIPythonCommandline.launch_jmol(self, output_jmol, plain_text)
    365 jdata = JmolData()
    366 if not jdata.is_jmol_available() and not DOCTEST_MODE:
--> 367     raise RuntimeError('jmol cannot run, no suitable java
version found')
    368 launch_script = output_jmol.launch_script_filename()
    369 jmol_cmd = 'jmol'

RuntimeError: jmol cannot run, no suitable java version found
sage:

[Dima Pasechnik]

This most probably just means that jmol package is not installed. It's
now optional, you need to explicitly say you want it installed.
The quickest way would by just

make jmol

from the directory you built Sage from.
Then try running your test again

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[Richard Quint]

That was it.  I missed that jmol was optional now.  Thanks