def batch_tag(self, sentences):
        encoding = self._encoding
        default_options = ' '.join(_java_options)
        config_java(options=self.java_options, verbose=False)

        # Create a temporary input file
        _input_fh, self._input_file_path = tempfile.mkstemp(text=True)

        if encoding:
            self._cmd.extend(['-encoding', encoding])

        # Write the actual sentences to the temporary input file
        _input_fh = os.fdopen(_input_fh, 'w')
        _input = '\n'.join((' '.join(x) for x in sentences))
        if isinstance(_input, compat.text_type) and encoding:
            _input = _input.encode(encoding)
        _input_fh.write(_input)
        _input_fh.close()

        # Run the tagger and get the output
        stanpos_output, _stderr = java(self._cmd,classpath=self._stanford_jar, \
                                                       stdout=PIPE, stderr=PIPE)
        if encoding:
            stanpos_output = stanpos_output.decode(encoding)

        # Delete the temporary file
        os.unlink(self._input_file_path)

        # Return java configurations to their default values
        config_java(options=default_options, verbose=False)

        return self.parse_output(stanpos_output)

    def _execute(self, cmd, input_, verbose=False):
        encoding = self._encoding
        cmd.extend(['-charset', encoding])
        _options_cmd = self._options_cmd
        if _options_cmd:
            cmd.extend(['-options', self._options_cmd])

        default_options = ' '.join(_java_options)

        # Configure java.
        config_java(options=self.java_options, verbose=verbose)

        # Windows is incompatible with NamedTemporaryFile() without passing in delete=False.
        with tempfile.NamedTemporaryFile(mode='wb', delete=False) as input_file:
            # Write the actual sentences to the temporary input file
            if isinstance(input_, text_type) and encoding:
                input_ = input_.encode(encoding)
            input_file.write(input_)
            input_file.flush()

            cmd.append(input_file.name)

            # Run the tagger and get the output.
            stdout, stderr = java(cmd, classpath=self._stanford_jar,
                                  stdout=PIPE, stderr=PIPE)
            stdout = stdout.decode(encoding)

        os.unlink(input_file.name)

        # Return java configurations to their default values.
        config_java(options=default_options, verbose=False)

        return stdout

def config_weka(classpath=None):
    global _weka_classpath

    # Make sure java's configured first.
    config_java()
    
    if classpath is not None:
        _weka_classpath = classpath

    if _weka_classpath is None:
        searchpath = _weka_search
        if 'WEKAHOME' in os.environ:
            searchpath.insert(0, os.environ['WEKAHOME'])
        
        for path in searchpath:
            if os.path.exists(os.path.join(path, 'weka.jar')):
                _weka_classpath = os.path.join(path, 'weka.jar')
                version = _check_weka_version(_weka_classpath)
                if version:
                    print ('[Found Weka: %s (version %s)]' %
                           (_weka_classpath, version))
                else:
                    print '[Found Weka: %s]' % _weka_classpath
                _check_weka_version(_weka_classpath)

    if _weka_classpath is None:
        raise LookupError('Unable to find weka.jar!  Use config_weka() '
                          'or set the WEKAHOME environment variable. '
                          'For more information about Weka, please see '
                          'http://www.cs.waikato.ac.nz/ml/weka/')

def config_weka(classpath=None):
    global _weka_classpath

    # Make sure java's configured first.
    config_java()

    if classpath is not None:
        _weka_classpath = classpath

    if _weka_classpath is None:
        searchpath = _weka_search
        if "WEKAHOME" in os.environ:
            searchpath.insert(0, os.environ["WEKAHOME"])

        for path in searchpath:
            if os.path.exists(os.path.join(path, "weka.jar")):
                _weka_classpath = os.path.join(path, "weka.jar")
                version = _check_weka_version(_weka_classpath)
                if version:
                    print(("[Found Weka: %s (version %s)]" % (_weka_classpath, version)))
                else:
                    print("[Found Weka: %s]" % _weka_classpath)
                _check_weka_version(_weka_classpath)

    if _weka_classpath is None:
        raise LookupError(
            "Unable to find weka.jar!  Use config_weka() "
            "or set the WEKAHOME environment variable. "
            "For more information about Weka, please see "
            "http://www.cs.waikato.ac.nz/ml/weka/"
        )

    def __init__(self, model='stanford/models/english-bidirectional-distsim.tagger', libpath='stanford/', verbose=False):
        self._model = model
        self._verbose = verbose
        self._libs = find_jars_within_path(libpath)
        self._xml_regex = re.compile(
            r'  <word wid="[0-9]*" pos="([^"]*)" lemma="([^"]*)">(.*?)</word>')

        config_java(verbose=verbose)

    def _execute(self, cmd, verbose=False):
        encoding = self._encoding
        #cmd.extend(['-inputEncoding', encoding])
        _options_cmd = self._options_cmd
        if _options_cmd:
            cmd.extend(['-options', self._options_cmd])
 
        default_options = ' '.join(_java_options)
 
        config_java(options=self.java_options, verbose=verbose)     # Configure java.
        stdout, _stderr = java(cmd,classpath=self._stanford_jar, stdout=PIPE, stderr=PIPE)
        stdout = stdout.decode(encoding)
        config_java(options=default_options, verbose=verbose)       # Return java configurations to their default values.
 
        return stdout

    def _execute(self, cmd, input_, verbose=False):
        encoding = self._encoding
        cmd.extend(['-encoding', encoding])
        if self.corenlp_options:
            cmd.append(self.corenlp_options)

        default_options = ' '.join(_java_options)

        # Configure java.
        config_java(options=self.java_options, verbose=verbose)

        # Windows is incompatible with NamedTemporaryFile() without passing in delete=False.
        with tempfile.NamedTemporaryFile(mode='wb', delete=False) as input_file:
            # Write the actual sentences to the temporary input file
            if isinstance(input_, text_type) and encoding:
                input_ = input_.encode(encoding)
            input_file.write(input_)
            input_file.flush()

            # Run the tagger and get the output.
            if self._USE_STDIN:
                input_file.seek(0)
                stdout, stderr = java(
                    cmd,
                    classpath=self._classpath,
                    stdin=input_file,
                    stdout=PIPE,
                    stderr=PIPE,
                )
            else:
                cmd.append(input_file.name)
                stdout, stderr = java(
                    cmd, classpath=self._classpath, stdout=PIPE, stderr=PIPE
                )

            stdout = stdout.replace(b'\xc2\xa0', b' ')
            stdout = stdout.replace(b'\x00\xa0', b' ')
            stdout = stdout.decode(encoding)

        os.unlink(input_file.name)

        # Return java configurations to their default values.
        config_java(options=default_options, verbose=False)

        return stdout

    def _classify_using_weka(self, test_comments, feature_extractor):
        test_set = nltk.classify.util.apply_features(feature_extractor.extract, test_comments)
        
        temp_dir = tempfile.mkdtemp()
        self.test_filename = os.path.join(temp_dir, 'test.arff')               
        
        logger.info('Writing Test WEKA File: ' + self.test_filename)
        self._write_ARFF_file(self.test_filename, test_set)

        cmd = [self.javaclass, '-t', self.train_filename, '-T', self.test_filename] + ['-p', '0']
        
        logger.info('Executing WEKA: ' + str(cmd))
        
        config_java(options='-Xmx2000M')
        (stdout, stderr) = java(cmd, classpath=weka_classpath,
                                    stdout=subprocess.PIPE,
                                    stderr=subprocess.PIPE)
        
        return self.parse_weka_output(stdout.split('\n'))

    def start(self):
        import requests

        cmd = ['edu.stanford.nlp.pipeline.StanfordCoreNLPServer']

        if self.corenlp_options:
            cmd.extend(self.corenlp_options)

        # Configure java.
        default_options = ' '.join(_java_options)
        config_java(options=self.java_options, verbose=self.verbose)

        try:
            # TODO: it's probably a bad idea to pipe stdout, as it will
            #       accumulate when lots of text is being parsed.
            self.popen = java(
                cmd,
                classpath=self._classpath,
                blocking=False,
                stdout='pipe',
                stderr='pipe',
            )
        finally:
            # Return java configurations to their default values.
            config_java(options=default_options, verbose=self.verbose)

        # Check that the server is istill running.
        returncode = self.popen.poll()
        if returncode is not None:
            _, stderrdata = self.popen.communicate()
            raise CoreNLPServerError(
                returncode,
                'Could not start the server. '
                'The error was: {}'.format(stderrdata.decode('ascii'))
            )

        for i in range(30):
            try:
                response = requests.get(requests.compat.urljoin(self.url, 'live'))
            except requests.exceptions.ConnectionError:
                time.sleep(1)
            else:
                if response.ok:
                    break
        else:
            raise CoreNLPServerError(
                'Could not connect to the server.'
            )

        for i in range(60):
            try:
                response = requests.get(requests.compat.urljoin(self.url, 'ready'))
            except requests.exceptions.ConnectionError:
                time.sleep(1)
            else:
                if response.ok:
                    break
        else:
            raise CoreNLPServerError(
                'The server is not ready.'
            )