Tomcat version 9.0 only supports J2EE 1.2, 1.3, 1.4, and Java EE 5, 6, 7, and 8 Web modules

解法，設成 Dynamic Web Module 下拉 Version 為 3.0 即可。

javax.servlet cannot be resolved

解決辦法：

只要按照下列步驟在Eclipse中導入就可以了。右擊項目，選擇Properties， 進入下界面，依次點擊：

Java Build Path —> Add Library —> Server Runtime —> Next

from unknown error: cannot read manifest

執行畫面:

發生的原因的確是無法讀取 manifest.json , 因為我直覺地直接壓縮目錄為 zip 檔, 應該要進去目錄裡再壓縮, 在多一層資料夾的情況下, 在解壓縮zip 後的根目錄是無法取得 manifest.json.

錯誤訊息：

ERROR: Could not build wheels for opencv-python, which is required to install pyproject.toml-based projects

從執行的畫面來看，應該是 pip 挑戰幫我的 macOS 10.15-x86_64 build 出一個執行檔，但失敗了。

I had the same problem and i did this,

pip install --upgrade pip setuptools wheel

then install opencv again,

pip install opencv-python

this not worked for me!

我最後解決了，解法：
https://cloud.tencent.com/developer/article/2221107

首先，先決定要安裝的是 opencv-python 或 opencv-python-headless , 這2個是獨立的套件，互不影響，如果你跟我一樣，是要跑 ddddocr, 那就是只要安裝後面的 opencv-python-headless 就可以了。

請點擊下面的網頁來下載 opencv-python-headless ：
https://mirrors.tuna.tsinghua.edu.cn/pypi/web/simple/opencv-python-headless/

如果是要下載 opencv-python-headless 就把上面的網址的 -headless 移除就可以了。

紅色框框，是我下載的 .whl 檔。

cp37 指最低要求是 python 3.7 ,

macosx_10_13 指最低要求是 macOS 10.13 版，由於我目前電腦環境是用 macOS 10.15 版，所以不能下載 10_16 的版本。

使用 intel CPU 請下載 x86_64.

使用 arm CPU 請用 arm64 的版本。

下載好後使用 pip3 install + .whl 檔, 就可以完成安裝：

上圖我用的是 python 3.10 的 Framework, 再另外安裝 opencv-python-headless, 是成功了。

我刪除python, 降低版本為 python 3.8 之後，只裝 opencv-python-headless 會顯示下面的錯誤訊息：

File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/cv2/init.py", line 153, in bootstrap
native_module = importlib.import_module("cv2")
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/importlib/init.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/cv2/cv2.abi3.so, 2): Symbol not found: _VTRegisterSupplementalVideoDecoderIfAvailable
Referenced from: /Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/cv2/.dylibs/libavcodec.59.37.100.dylib (which was built for Mac OS X 11.0)
Expected in: /System/Library/Frameworks/VideoToolbox.framework/Versions/A/VideoToolbox
in /Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/cv2/.dylibs/libavcodec.59.37.100.dylib

挑戰，到下面目錄，把沒有 -headless 的版本也下載並安裝：
https://mirrors.tuna.tsinghua.edu.cn/pypi/web/simple/opencv-python/

結果，錯誤訊息也一樣。

先手動地刪掉有問題的目錄：/python3.8/site-packages/cv2/

重新再用 pip -m install + .whl 檔。結果還是一樣。

應該是那個檔案有問題，所以再往前下載更舊一點的版本：
opencv-python-headless-4.6.0.66-cp36-abi3-macosx_10_15_x86_64.whl

OK, 搞定！果然是 opencv-python-headless-4.7 那個版本有問題，雖然是寫 macosx_10_13, 但實際是build macosx_11_0

然後，只需要安裝 -headless 的 .whl 就可以讓 ddddocr 成功 OCR了。

為了要可以使用 nodriver, nodriver 最少要 python 3.9 我只好再把 python 3.8 刪掉，版本提升到 python 3.10.11 版。opencv 的部人分，執行指令：

pip3 install opencv_python_headless-4.6.0.66-cp36-abi3-macosx_10_15_x86_64.whl

就搞定了。

<listener>
       <listener-class>com.site.cron.QuartzListener</listener-class>
   </listener>

然後, 想寫排程的程式, 來存取資料庫的時候, 程式會顯示錯誤訊息:

Exception in thread "Thread-52" java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [META-INF/services/javax.sql.rowset.RowSetFactory]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
  at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:1432)
  at org.apache.catalina.loader.WebappClassLoaderBase.findResources(WebappClassLoaderBase.java:1003)
  at org.apache.catalina.loader.WebappClassLoaderBase.getResources(WebappClassLoaderBase.java:1110)
  at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.nextProviderClass(ServiceLoader.java:1203)
  at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.hasNextService(ServiceLoader.java:1228)
  at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.hasNext(ServiceLoader.java:1273)
  at java.base/java.util.ServiceLoader$2.hasNext(ServiceLoader.java:1309)
  at java.base/java.util.ServiceLoader$3.hasNext(ServiceLoader.java:1393)
  at java.sql.rowset/javax.sql.rowset.RowSetProvider.loadViaServiceLoader(RowSetProvider.java:291)
  at java.sql.rowset/javax.sql.rowset.RowSetProvider.newFactory(RowSetProvider.java:153)

解法, 很簡單, 關閉 web server 正常啟動一次就可以了.

相關討論串:

• https://github.com/quartz-scheduler/quartz/issues/144
• https://stackoverflow.com/questions/3398201/illegal-access-quartz-with-jboss/3398874#3398874

It looks like your quartz job is trying to do something after your app was stopped. It might be trying to access some resources that were available while your app was running, but not anymore (something like getResourceAsStream maybe).

It might help if you post more info: stacktraces, code of your job, etc.

After update: Here is what I think is happening:

• You schedule your job successfully
• For whatever reason your webapp is stopped. I would search JBoss logs for a reason.
• At this moment time comes to execute your job (org.quartz.simpl.RAMJobStore.triggerFired(RAMJobStore.java:1313))
• This call goes down to isStateful method of JobDetail class
• The method has this code in it return (StatefulJob.class.isAssignableFrom(jobClass));
• StatefulJob class was not loaded before. Your classLoader tries to load it (org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204))
• Since your webapp was stopped, you are getting exception

The way I see it, you have two choices:

• Ignore this problem, since there is nothing you can do to make quartz work after your webapp was stopped
• Try to figure out what causes your webapp to stop and fix it

JSONObject["my_key_name"] is not a string (class java.time.LocalDateTime

如果使用 getLong顯示的錯誤訊息:

java.lang.NumberFormatException: For input string: "2023-05-10T14:28:57"

真怪, 明明是 String 但在java 裡又不能取出來.

解法, 先使用 get 取出 Object , 再強制轉型即可:

LocalDateTime dateTime = (LocalDateTime) p.right.getJSONObject(i).get("updatetime");
DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
String dateTime_string = dateTime.format(dateTimeFormatter);

如果你是使用 jsp 來寫, 會需要額外 import 這2個 class:

import="java.time.LocalDateTime"
import="java.time.format.DateTimeFormatter"    

UnicodeDecodeError: 'cp950' codec can't decode byte 0xe5 in position 8: illegal multibyte sequence

解決辦法

修改 Python 程式，在 open 檔案時多一個輸入參數，讓讀寫檔案的編碼方式為 UTF-8

open(‘text.txt’, ‘w’, encoding=’UTF-8′)

我的錯誤訊息：

>>> import cv2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/cv2/__init__.py", line 181, in <module>
    bootstrap()
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/cv2/__init__.py", line 153, in bootstrap
    native_module = importlib.import_module("cv2")
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/cv2/cv2.abi3.so, 2): Symbol not found: _VTRegisterSupplementalVideoDecoderIfAvailable
  Referenced from: /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/cv2/.dylibs/libavcodec.59.37.100.dylib (which was built for Mac OS X 11.0)
  Expected in: /System/Library/Frameworks/VideoToolbox.framework/Versions/A/VideoToolbox
 in /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/cv2/.dylibs/libavcodec.59.37.100.dylib

I have MAC osx 10.15 catalina so that for sure can be the problem, but how do I fix it? I don’t want to upgrade to macOS 11.

解法：

python3 -m pip install opencv-python==4.5.1.48
Collecting opencv-python==4.5.1.48

Message: element not interactable
  (Session info: chrome=1xx.0.5359.124)
Stacktrace:
....

解法：

from selenium.webdriver.common.action_chains import ActionChains
builder = ActionChains(driver)
builder.move_to_element(elm_Men_Menu).click(elm_FastTrack_Menu).perform()

或替代解法：

menu = driver.find_element_by_css_selector(".nav")
hidden_submenu = driver.find_element_by_css_selector(".nav #submenu1")

actions = ActionChains(driver)
actions.move_to_element(menu)
actions.click(hidden_submenu)
actions.perform()

但實際操作，還是一樣有錯誤訊息：

element not interactable: [object HTMLButtonElement] has no size and location

資料來源：
https://stackoverflow.com/questions/71238823/button-element-not-interactable-selenium

結論：無解，只好改用javascript 來做替代。

driver.execute_script("arguments[0].click();", el_btn)

The specified device is not open or is not recognized by MCI.

有可能是打包好的程式， 執行中的目錄(current woking directory)會在神奇的位置去執行。

解法，先判斷是否為執行檔：

    basis = ""
    if hasattr(sys, 'frozen'):
        basis = sys.executable
    else:
        basis = sys.argv[0]

再使用 os.path.join() 組合成完整的路徑，

先用platform 檢查，如果 Windows 平台，如果又是播放 wav 格式，遇到錯誤是，可以試看看切換到其他的套件來播放音效：

• simpleaudio：播放WAV文件和NumPy數組。
• winsound：播放WAV文件或鳴響您的系統揚聲器
  https://docs.python.org/3/library/winsound.html