compile small test case below and run javah -Xnew -old test
----test.java----------
public class test {
    public native void boola(boolean[] bol);
}

Results in error messages below.

An unknown array type encountered when generating old style headers.
java.util.MissingResourceException: Can't find resource for bundle java.util.PropertyResourceBundle,
 key bug.report
        at java.util.ResourceBundle.getObject(ResourceBundle.java:314)
        at java.util.ResourceBundle.getString(ResourceBundle.java:274)
        at com.sun.tools.javah.Util.getText(Util.java:60)
        at com.sun.tools.javah.Util.getText(Util.java:53)
        at com.sun.tools.javah.Util.bug(Util.java:97)
        at com.sun.tools.javah.Util.bug(Util.java:90)
        at com.sun.tools.javah.OldHeaders.getCType(OldHeaders.java:340)
        at com.sun.tools.javah.OldHeaders.getCPrototypes(OldHeaders.java:200)
        at com.sun.tools.javah.OldHeaders.write(OldHeaders.java:70)
        at com.sun.tools.javah.Gen.run(Gen.java:132)
        at com.sun.tools.javah.MainDoclet.start(MainDoclet.java:102)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at com.sun.tools.javadoc.DocletInvoker.invoke(DocletInvoker.java:209)
        at com.sun.tools.javadoc.DocletInvoker.start(DocletInvoker.java:89)
        at com.sun.tools.javadoc.Start.parseAndExecute(Start.java:333)
        at com.sun.tools.javadoc.Start.begin(Start.java:127)
        at com.sun.tools.javadoc.Main.execute(Main.java:66)
        at com.sun.tools.javah.Main.main(Main.java:162)
Key bug.report not found in resources.
###@###.### 2003-10-03