On merlin (jdk1.4) beta 3 on Solaris native code in the font initialisation
logic is violating the JNI spec.
Executing apps such as demo/jfc/Font2DTest while passing the non-standard
-Xcheck:jni option shows that the JRE is making a Java upcall in the scope
of a GetStringCritical :-

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FATAL ERROR in native method: Calling other JNI functions in the scope
of Get/ReleasePrimitiveArrayCritical or Get/ReleaseStringCritical
        at sun.awt.font.NativeFontWrapper.registerFonts(Native Method)
        - locked <f621b1c0> (a java.lang.Class)
        at
sun.java2d.SunGraphicsEnvironment.addPathFonts(SunGraphicsEnvironment.java:712)
        at
sun.java2d.SunGraphicsEnvironment.registerFonts(SunGraphicsEnvironment.java:563)
        at
sun.java2d.SunGraphicsEnvironment.access$000(SunGraphicsEnvironment.java:60)
        at
sun.java2d.SunGraphicsEnvironment$2.run(SunGraphicsEnvironment.java:213)
        at java.security.AccessController.doPrivileged(Native Method)
        at
sun.java2d.SunGraphicsEnvironment.loadFonts(SunGraphicsEnvironment.java:207)
        - locked <f2807d68> (a sun.awt.X11GraphicsEnvironment)
        at
sun.java2d.SunGraphicsEnvironment.mapFamilyName(SunGraphicsEnvironment.java:405)
        at java.awt.Font.initializeFont(Font.java:276)
        at java.awt.Font.<init>(Font.java:308)


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This doesn't cause a problem in normal operation but can make it more
difficult to identify similar JNI errors which may occur elsewhere as this one
prevents others being reached whilst running with the -Xcheck:jni option.