Error while scanning (parsing). Unterminated character/string literal at " ' "

Running scans...
Traceback (most recent call last):
File "/usr/local/bin/qark", line 11, in
load_entry_point('qark==4.0.0', 'console_scripts', 'qark')()
File "/usr/lib/python3/dist-packages/click/core.py", line 722, in call
return self.main(*args, **kwargs)
File "/usr/lib/python3/dist-packages/click/core.py", line 697, in main
rv = self.invoke(ctx)
File "/usr/lib/python3/dist-packages/click/core.py", line 895, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/usr/lib/python3/dist-packages/click/core.py", line 535, in invoke
return callback(*args, **kwargs)
File "/usr/lib/python3/dist-packages/click/decorators.py", line 17, in new_func
return f(get_current_context(), *args, **kwargs)
File "/usr/local/lib/python3.6/dist-packages/qark-4.0.0-py3.6.egg/qark/qark.py", line 94, in cli
scanner.run()
File "/usr/local/lib/python3.6/dist-packages/qark-4.0.0-py3.6.egg/qark/scanner/scanner.py", line 64, in run
self._run_checks(plugins)
File "/usr/local/lib/python3.6/dist-packages/qark-4.0.0-py3.6.egg/qark/scanner/scanner.py", line 78, in _run_checks
current_file_subject.notify(filepath)
File "/usr/local/lib/python3.6/dist-packages/qark-4.0.0-py3.6.egg/qark/scanner/scanner.py", line 125, in notify
observer.update(file_path, call_run=True)
File "/usr/local/lib/python3.6/dist-packages/qark-4.0.0-py3.6.egg/qark/scanner/plugin.py", line 239, in update
super(CoroutinePlugin, self).update(file_path)
File "/usr/local/lib/python3.6/dist-packages/qark-4.0.0-py3.6.egg/qark/scanner/plugin.py", line 185, in update
JavaASTPlugin.java_ast = javalang.parse.parse(self.file_contents)
File "/usr/local/lib/python3.6/dist-packages/javalang-0.12.0-py3.6.egg/javalang/parse.py", line 52, in parse
parser = Parser(tokens)
File "/usr/local/lib/python3.6/dist-packages/javalang-0.12.0-py3.6.egg/javalang/parser.py", line 95, in init
self.tokens = util.LookAheadListIterator(tokens)
File "/usr/local/lib/python3.6/dist-packages/javalang-0.12.0-py3.6.egg/javalang/util.py", line 92, in init
self.list = list(iterable)
File "/usr/local/lib/python3.6/dist-packages/javalang-0.12.0-py3.6.egg/javalang/tokenizer.py", line 531, in tokenize
self.read_string()
File "/usr/local/lib/python3.6/dist-packages/javalang-0.12.0-py3.6.egg/javalang/tokenizer.py", line 201, in read_string
self.error('Unterminated character/string literal')
File "/usr/local/lib/python3.6/dist-packages/javalang-0.12.0-py3.6.egg/javalang/tokenizer.py", line 572, in error
raise error
javalang.tokenizer.LexerError: Unterminated character/string literal at "'", line 724: java.lang.UnsupportedOperationException: Can't linearise an unstructured statement

Start at qark/scanner/plugin.py, especially JavaASTPlugin.update, and trace the call into javalang.parse.parse and tokenizer.read_string shown in the traceback. Reproduce the scan with the Java source containing the reported line 724; done means the scanner no longer aborts with this lexer traceback and the input is handled or reported appropriately.