These warning messages produced after running following test cases:
(Solaris 9, 64bit w/ tiger1.5.0_b13)

>java CharView
>java -jar Font2DTest.jar
>java -jar SwingSet2.jar
 
> Warning: Cannot convert string "-monotype-arial-regular-r-normal--*-140-*-*-p-*-iso8859-2" to type FontStruct
> Warning: Cannot convert string "-monotype-arial-regular-r-normal--*-140-*-*-p-*-iso8859-5" to type FontStruct
> Warning: Cannot convert string "-monotype-arial greek-regular-r-normal--*-140-*-*-p-*-iso8859-7" to type FontStruct
> Warning: Cannot convert string "-monotype-arial-regular-r-normal--*-140-*-*-p-*-iso8859-9" to type FontStruct

After these message, the test was able to perform.
It looks like compilation warning message.