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This article is about msf4j micro-service framework ParseException: Unparsable date: "2019-01-01 00:00:00" exception how to deal with, the editor thinks it is very practical, so share with you to learn, I hope you can get something after reading this article, not much to say, follow the editor to have a look.

Recently, we encountered a problem. When the front-end interface passed a value to the back-end interface, the time string (for example, 2019-01-01 00:00:00) was transferred to timestamp in error, resulting in the failure of the interface call. The same code runs on windows, but an exception occurs on linux or mac. It is initially suspected that it is caused by the inconsistency of time zones between Windows and linux/Mac, so output the system language and system region on mac and Linux. The results are all in Chinese:

It shows that there is no problem with the system language setting, so use the debug mode to find the exception step by step, and finally find the problem here:

According to the time conversion logic rendered by the source code of msf4j:

In the class DateTypeAdapter, three DateFormat instances for transformation are declared, namely:

EnUsFormat American language

LocalFormat native language

Iso8601Format iso8601 standard

Next, call the conversion method private synchronized Date deserializeToDate (String json) to convert string into a Date object to complete the conversion.

Unfortunately, in both linux and mac, the conversion fails, and the conversion is successful only under windows. By searching in debug mode, it is found that the reason is DateFormat.getDateTimeInstance () when the DateFormat instance is created. The locale obtained in mac mode is en_CN:

The locale obtained in windows mode is zh_CN:

So the problem lies with en_CN and zh_CN, where en and zh represent the system language, en for English (generally referring to American English), zh for Chinese, and CN for country-China, which may be better understood in another way:

Locale locale = Locale.getDefault (); System.out.println (locale.getLanguage ()); / / output system language code System.out.println (locale.getCountry ()); / / output system country code System.out.println (locale.getDisplayLanguage ()); / / output system language name System.out.println (locale.getDisplayCountry ()); / / output system country name

The output is as follows:

However, even if the output is Chinese and Chinese, it is still possible to make errors, because there is no need to specify locale during the creation of the instance DateFormat localFormat = DateFormat.getDateTimeInstance (2,2). This method uses a system default language, Local.Category.Format:

Public final static DateFormat getDateTimeInstance (int dateStyle, int timeStyle) {return get (timeStyle, dateStyle, 3, Locale.getDefault (Locale.Category.FORMAT));}

At this time, if the language in the mac system is Chinese plus English, like this:

The language obtained by Locale.Category.Format will be en, so it becomes en_CN (English _ China), and then the conversion fails.

So the solution is to set Locale.setDefault (Locale.CHINA) to jvm before creating the DateFormat instance, so as to prevent jvm from finding languages other than Chinese in the process of finding the system language, resulting in the exception of conversion failure.

Of course, if you delete English and keep only Chinese, you don't have to set Locale to CHINA, so it's the same on linux. In the system language, there is more than one Chinese language, including English, although the first language is Chinese.

This is how to deal with the exception of ParseException: Unparsable date: "2019-01-01 00:00:00" in the msf4j micro-service framework. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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