Jdk/jre loads incorrect font.properties

I am using Solaris8 Multilanguage edition(4/01) free binary licsence on a Ultra 10 workstation, the jdk/jre version is 1.2.2_05a.
My problem is when I set the language environment to Japanese, the jdk/jre will load font.properties.ja.5.5.1 instead of font.properties.ja, and if I set the language environment to English, the jdk/jre will load the correct one - font.properties, although there is also a font.properties.5.5.1. The 'os.version' system property can be obtained from java program correcttly, it says '5.8'.
Can anybody tell me what is the mechanism causes this? i have to find out the way to ensure the jdk/jre to load the correct font.properties file, any help appreciated!

This reply posted by myself to provide addtional information.
I finally found out the mechanism is:
The following fact tested when the language environment is set to Japanese.
If both font.properties.ja and font.properties.ja.5.5.1 exist, the VM first try to use font.properties.ja, but if font.properites.ja contains any font which causes a 'Font specified in font.properties not found' error, the VM abandons font.properties.ja and tries to use font.properties.ja.5.5.1, if font.properties.ja.5.5.1 doesn't cause any error, no error will be output, but if there is still any font cause an error, the error will be printed.
If only one file exists, it will be used, and any error caused by it will be printed.
So if font.properties.ja contains any font which causes an error, the result looks like that the VM only loaded font.properties.ja.5.5.1.
And if the lanuage environment is set to C, only font.properties will be loaded, any error caused by it will be printed. font.properties.5.5.1 will never be used.
Is this the specification? who knows...
FYI

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