ADDITIONAL SYSTEM INFORMATION :
Linux and JDK8

A DESCRIPTION OF THE PROBLEM :
On linux system, I set screen zoom from 100% to 125%, Toolkit.getDefaultToolkit().getScreenResolution() still return 96. The right value is 120.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1, Set screen zoom from 100% to 125%.
2, call Toolkit.getDefaultToolkit().getScreenResolution().


---------- BEGIN SOURCE ----------
import java.awt.Toolkit;

public class TestDpi
{
public static void main(String[] args)
    {
System.out.println(Toolkit.getDefaultToolkit().getScreenResolution());

    }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
1, jdk/make/mapfiles/libawt_xawt/mapfile-vers
add code:
Java_sun_awt_X11_XlibWrapper_DisplayDpi;
2, jdk/src/solaris/classes/sun/awt/X11/XlibWrapper.java
add code:
    static native int DisplayDpi(long display);
3, jdk/src/solaris/native/sun/xawt/XlibWrapper.c
add code:
/**
 XResourceManagerString() like:
Xcursor.size: 24
Xcursor.theme: dark-sense
Xft.antialias: 1
Xft.dpi: 96
Xft.hinting: 1
Xft.hintstyle: hintslight
Xft.lcdfilter: lcddefault
Xft.rgba: rgb
The sepatator is tab(\t)
 */
#define KEY_XFT_DPI "Xft.dpi"
JNIEXPORT jint JNICALL Java_sun_awt_X11_XlibWrapper_DisplayDpi
(JNIEnv *env, jclass clazz, jlong display) {

    AWT_CHECK_HAVE_LOCK_RETURN(0);
    char* psInfo = NULL;
    char* pEnd = NULL;
    char caDpi[32] = {0};
    
    psInfo = XResourceManagerString((Display *) jlong_to_ptr(display));
    if (psInfo == NULL)
    {
        return 0;
    }
    
    psInfo = strstr(psInfo, KEY_XFT_DPI);
    psInfo = strchr(psInfo, ':' ) + 1;
    pEnd = strchr(psInfo, '\n');
    strncpy(caDpi, psInfo, (pEnd-psInfo));
    return atoi(caDpi);
}
4, jdk/src/solaris/classes/sun/awt/X11/XToolkit.java
    public int getScreenResolution() {
        long display = getDisplay();
        awtLock();
        try {
            /*
            return (int) ((XlibWrapper.DisplayWidth(display,
                XlibWrapper.DefaultScreen(display)) * 25.4) /
                    XlibWrapper.DisplayWidthMM(display,
                XlibWrapper.DefaultScreen(display)));
            */
            return XlibWrapper.DisplayDpi(display);
        } finally {
            awtUnlock();
        }
    }

FREQUENCY : always