<i18n dev> Scanner and NumberFormatProvider

[Yoshito Umaoka]

Hi Sato-san,

I filed a bug ID: 9051183.

Thanks,

Yoshito


On 10/13/2017 1:57 PM, Naoto Sato wrote:
> Hi Umaoka-san,
>
> Yeah, that looks like a bug to me. Can you please file it, as I wasn't 
> aware of it being reported.
>
> Naoto
>
> On 10/13/17 10:39 AM, Yoshito Umaoka wrote:
>> Hello,
>>
>> I received a problem report from an ICU4J consumer who uses ICU4J 
>> Locale SPI module.
>> ICU NumberFormatProvider returns a class - 
>> com.ibm.icu.impl.jdkadapter.NumberFormatICU which extends 
>> java.text.NumberFormat.
>>
>> The ICU4J locale SPI user found the ICU provider causes an issue when 
>> he uses Scanner. I can reproduce the problem on my environment as 
>> well. The exception call stack shows -
>>
>> Exception in thread "main" java.lang.ClassCastException: 
>> com.ibm.icu.impl.jdkadapter.NumberFormatICU cannot be cast to 
>> java.text.DecimalFormat
>>     at java.util.Scanner.useLocale(Scanner.java:1186)
>>     at java.util.Scanner.<init>(Scanner.java:540)
>>     at java.util.Scanner.<init>(Scanner.java:563)
>>     at test.ScannerTest.main(ScannerTest.java:11)
>>
>> Below is the location in Scanner.java
>>
>>      public Scanner useLocale(Locale locale) {
>>          if (locale.equals(this.locale))
>>              return this;
>>
>>          this.locale = locale;
>>          DecimalFormat df =
>> (DecimalFormat)NumberFormat.getNumberInstance(locale);
>>          DecimalFormatSymbols dfs = 
>> DecimalFormatSymbols.getInstance(locale);
>>
>> So the implementation blindly cast NumberFormat instance returned by 
>> getNumberIntance(Locale) to DecimalFormat.
>> I thought I reported this issue before. Are you aware of this issue? 
>> Maybe, I forgot to file a bug when I investigated this earlier in 
>> this year, because I could not find it in java bug.
>>
>> -Yoshito
>>