The Python code looks like this:
def go():
g = stringtemplate.StringTemplateGroup("A","B")
g.getInstanceOf("A_TEMPLATE")
When calling go() from Java/Jython, the following exception is raised:
Exception in thread "main" Traceback (innermost last):
...
...
File "C:\DEV\stringtemplate3\groups.py", line 363, in getInstanceOf
File "C:\DEV\stringtemplate3\templates.py", line 391, in getInstanceOf
File "C:\DEV\stringtemplate3\templates.py", line 369, in dup
File "C:\DEV\jython2.2.1\Lib\copy.py", line 78, in copy
Error: un(shallow)copyable object of type
Others have bumped into this error too. It's because Jython doesn't fully implement object copying (in the same sense that CPython doesn't implement it fully -- you cannot just copy arbitraty C objects). It turns out, that this isn't a problem for me, because as soon as I've changed the StringTemplateGroup error listener to my own (copyable) listener, the problem went away.
But there's one caveat. I actually choose to NOT use any custom error listener, because console errors are okay for me, so I've tried and put errors=None in the StringTemplateGroup constructor, which is a no-no, because None means "use the default one", which is exactly what I didn't want right now.
So the final solution was to redefine go like so:
def go():
g = stringtemplate.StringTemplateGroup("A","B")
g.errorListener = None
g.getInstanceOf("A_TEMPLATE")
Works like a charm, so far.
