关键云铸造厂上的Python Flask应用程序抛出Java错误

时间：2020-08-10 08:17:51

标签： python flask pivotal-cloud-foundry tabula pcfdev

我有一个python flask应用程序，该应用程序内部使用表格从pdf文件中提取表格。我执行“ cf push”并在PCF上运行该应用程序后，将pdf文件加载到该应用程序中以读取表格。当应用尝试提取表格数据时，出现以下错误。

2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] [2020-08-10 08:08:40,134] ERROR in app: Exception on / [POST]
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] Traceback (most recent call last):
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] File "/home/vcap/deps/0/python/lib/python3.8/site-packages/tabula/io.py", line 80, in _run
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] result = subprocess.run(
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] File "/home/vcap/deps/0/python/lib/python3.8/subprocess.py", line 489, in run
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] with Popen(*popenargs, **kwargs) as process:
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] File "/home/vcap/deps/0/python/lib/python3.8/subprocess.py", line 854, in __init__
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] self._execute_child(args, executable, preexec_fn, close_fds,
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] File "/home/vcap/deps/0/python/lib/python3.8/subprocess.py", line 1702, in _execute_child
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] raise child_exception_type(errno_num, err_msg, err_filename)
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] FileNotFoundError: [Errno 2] No such file or directory: 'java'
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] During handling of the above exception, another exception occurred:
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] Traceback (most recent call last):
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] File "/home/vcap/deps/0/python/lib/python3.8/site-packages/flask/app.py", line 2446, in wsgi_app
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] response = self.full_dispatch_request()
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] File "/home/vcap/deps/0/python/lib/python3.8/site-packages/flask/app.py", line 1951, in full_dispatch_request
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] rv = self.handle_user_exception(e)
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] File "/home/vcap/deps/0/python/lib/python3.8/site-packages/flask/app.py", line 1820, in handle_user_exception
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] reraise(exc_type, exc_value, tb)
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] File "/home/vcap/deps/0/python/lib/python3.8/site-packages/flask/_compat.py", line 39, in reraise
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] raise value
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] File "/home/vcap/deps/0/python/lib/python3.8/site-packages/flask/app.py", line 1949, in full_dispatch_request
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] rv = self.dispatch_request()
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] File "/home/vcap/deps/0/python/lib/python3.8/site-packages/flask/app.py", line 1935, in dispatch_request
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] return self.view_functions[rule.endpoint](**req.view_args)
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] File "app.py", line 55, in index
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] wireListDF = pdfExtractorOBJ.getWireListDataFrame()
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] File "/home/vcap/app/WireHarnessPDFExtractor.py", line 158, in getWireListDataFrame
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] self.readBTPPDF()
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] File "/home/vcap/app/WireHarnessPDFExtractor.py", line 31, in readBTPPDF
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] df = tabula.read_pdf(self.pdf_path, pages='all', stream=True ,guess=True, encoding="utf-8",
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] File "/home/vcap/deps/0/python/lib/python3.8/site-packages/tabula/io.py", line 322, in read_pdf
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] output = _run(java_options, kwargs, path, encoding)
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] File "/home/vcap/deps/0/python/lib/python3.8/site-packages/tabula/io.py", line 91, in _run
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] raise JavaNotFoundError(JAVA_NOT_FOUND_ERROR)
2020-08-10T13:38:40.135+05:30 [APP/PROC/WEB/0] [ERR] tabula.errors.JavaNotFoundError: `java` command is not found from this Python process.Please ensure Java is installed and PATH is set for `java`
2020-08-10T13:38:40.136+05:30 [APP/PROC/WEB/0] [ERR] 10.255.10.112 - - [10/Aug/2020 08:08:40] "[35m[1mPOST / HTTP/1.1[0m" 500 -

我知道tabula具有java依赖性，关于如何使用tabula为python flask应用程序进行设置的任何建议，以便可以在PCF平台上使用。

2 个答案:

答案 0 :(得分：1)

这是Java路径错误。您的python运行时根本找不到Java。您需要确保在导出路径变量中导出Java。如果您在Linux上运行此过程，则可以导出export PATH=<your java bin dir>:$PATH

答案 1 :(得分：0)

亮点：

  • 您需要多个buildpack，一个用于Java，一个用于Python
  • 您想使用apt-buildpack，而不是Java buildpack
  • 您需要将PATH设置为指向apt-buildpack安装Java的位置（或让您的应用在该特定位置查找Java）
  • 您可以在static string GetValidInt(string prompt, int min, int max) { bool valid = false; string myInt = "-1"; //string myInt; //trying to convert a int to string do { Console.Write(prompt); try { //myInt = Console.ReadLine(); myInt = Console.ReadLine(); if (int.Parse(myInt)< min || int.TryParse(myInt) > max) { throw new Exception("Provided integer was outside of the bounds specified."); } valid = true; } catch (Exception ex) { Console.WriteLine($"Parse failed: {ex.Message}"); } } while (!valid); enter code here return myInt; } 文件中设置PATH。

所有这些都在my answer to this similar question中进行了说明。

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