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- How to use unsupported Locale in Java 11 and numbers in String. format()
If a particular provider cannot offer the requested locale data, the search will proceed to the next provider in order So, in short if you really don't want the default behaviour to be that of Java-11, you can change the order of lookup with the VM argument-Djava locale providers=COMPAT,CLDR,SPI
- java. locale. providers Java System Property
You can set the java locale providers java system property during startup of the java runtime using the -D command line argument: java -Djava locale providers=COMPAT MyAppMain You may also be able to specify java locale providers via the JAVA_TOOL_OPTIONS environment variable: JAVA_TOOL_OPTIONS=-Djava locale providers=COMPAT Setting Reading
- Locale Problems Upgrading from Java 8 • 2025 - Incus Data Programming . . .
Fortunately fixing the problem is easy Passing the option -Djava locale providers=COMPAT to the VM when running your application will make the Java 11 locale loader to behave in the same way as the earlier versions
- JEP 252: Use CLDR Locale Data by Default - OpenJDK
Prior to deploying on JDK 9 or later where CLDR locale data is used by default, we strongly encourage you to check for compatibility issues by running your applications on JDK 8 with the CLDR provider selected Do this by starting the Java 8 runtime with $ java -Djava locale providers=CLDR,JRE
- 6 Preparing for Migration - docs. oracle. com
The system property value COMPAT can be used as a synonym for JRE, for example, -Djava locale providers=COMPAT,CLDR Note: Forcing the use of legacy locale data must be treated as a temporary measure
- Java 11 Supported Locales - Oracle
Locales from other locale providers can be used by configuring the “java locale providers” system property For example, if the user wants to have the same experience with the underlying operating system, specifying the system property with "HOST,CLDR,COMPAT", lets the locale sensitive services behave like what the underlying OS does for
- JDK 23 RDP2 | Removal of the legacy COMPAT locale provider and more . . .
As a consequence, setting java locale providers to JRE or COMPAT has no effect Projects that are still using legacy locale data are highly encouraged to switch to CLDR as soon as possible Where that is infeasible, two alternatives remain:
- JDK-8325568 : Remove legacy locale data (COMPAT, JRE) from the JDK - Java
Developers could start their applications with `java -Djava locale providers=JRE,CLDR ` or `java -Djava locale providers=COMPAT,CLDR ` to force use of the legacy locale data ahead of the Unicode CLDR locale data
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