This code is for solving the Einstein Who Owns the Fish puzzle. Right now all I get is No solution found. I can't post the whole code but here is snippets of the logic:

import java.util.Arrays;

public class WhoOwnsTheFish $\{$

$//$ Constants for each possible value

private final int NONE $=-1$;

private final int NATIONALITY $=0$;

private final int COLOR $=1$;

private final int DRINKS $=2$;

private final int SMOKES $=3$;

private final int PET $=4$;

private final int NORWEGIAN $=0$;

private final int DANE $=1$;

private final int BRIT $=2$;

private final int GERMAN $=3$;

private final int SWEDE $=4$;

private final int WATER $=0$;

private final int TEA $=1$;

private final int COFFEE $=2$;

private final int BEER $=3$;

private final int MILK $=4$;

private final int DUNHILLS $=0$;

private final int BLENDS $=1$;

private final int PALLMALLS $=2$;

private final int PRINCES $=3$;

private final int BLUEMASTERS $=4$;

private final int CAT $=0$;

private final int HORSE $=1$;

private final int BIRD $=2$;

private final int FISH $=3$;

private final int DOG $=4$;

private final int BLUE $=0$;

private final int GREEN $=1$;

private final int RED $=2$;

private final int YELLOW $=3$;

private final int WHITE $=4$;

public boolean valid $($int$[][]$ houses, int h$,$ int a$,$ int value$)\{$

$//$ is the value assigned to another house

for$($int i $=0$; i $<$ houses.length; i$++)\{$

if$($i $!=$ h && houses$[$i$][$a$]==$ value$)\{$

return false;

$\}$

$\}$

$//$ switch case to check the attribute and the value

switch$($a$)\{$

$//$ START HERE

$//$ the brit lives

case NATIONALITY:

if $($value $==$ BRIT && houses$[$h$][$COLOR$]!=$ NONE && houses$[$h$][$COLOR$]!=$ RED$)\{$

return false;

$\}$

$//$ the Swede keeps dogs as pets

if $($value $==$ SWEDE && houses$[$h$][$PET$]!=$ NONE && houses$[$h$][$PET$]!=$ DOG$)\{$

return false;

$\}$

$//$ the Dane drinks tea

if$($value $==$ DANE && houses$[$h$][$DRINKS$]!=$ NONE && houses$[$h$][$DRINKS$]!=$ TEA$)\{$

return false;

$\}$

$//$ the Norwegian lives in the first house

if$($value $==$ NORWEGIAN && h $!=0)\{$

return false;

$\}$

$//$ the German smokes Princes

if$($value $==$ GERMAN && houses$[$h$][$SMOKES$]!=$ NONE && houses$[$h$][$SMOKES$]!=$ PRINCES$)\{$

return false;

$\}$

break;

case COLOR:

$//$ the Brit lives in the red house

if$($value $==$ RED && houses$[$h$][$NATIONALITY$]!=$ NONE && houses$[$h$][$NATIONALITY$]!=$ BRIT$)\{$

return false;

$\}$

$//$ the green house is on the left of and next to the

$//$ white house

if$($value $==$ GREEN && $($h $==4||$ houses$[$h $+1][$COLOR$]!=$ NONE && houses$[$h $+1][$COLOR$]!=$ WHITE$))\{$

return false;

$\}$

if $($value $==$ WHITE && $($h $==0||$ houses$[$h $-1][$COLOR$]!=$ NONE && houses$[$h $-1][$COLOR$]!=$ GREEN$))\{$

return false;

$\}$

$//$ the owner of the yellow house smokes dunhills, which means that the owner of the yellow house is the Norwegian

if$($value $==$ YELLOW && houses$[$h$][$SMOKES$]!=$ NONE && houses$[$h$][$SMOKES$]!=$ DUNHILLS$)\{$

return false;

$\}$

$//$ the Norwegian lives next to the blue house

if $($value $==$ BLUE && $($h $!=1$ && h $!=4||$ houses$[$h $+1][$NATIONALITY$]!=$ NONE && houses$[$h $-1][$NATIONALITY$]!=$ NORWEGIAN$))\{$

return false;

$\}$

break;

case DRINKS:

$//$ the green houses owner drinks coffe, which is the German

if$($value $==$ COFFEE && houses$[$h$][$NATIONALITY$]!=$ NONE && houses$[$h$][$COLOR$]!=$ GREEN$)\{$

return false;

$\}$

if $($value $==$ TEA && houses$[$h$][$NATIONALITY$]!=$ NONE && houses$[$h$][$NATIONALITY$]!=$ DANE$)\{$

return false;

$\}$

$//$ the man living in the center house drinks milk

if$($value $==$ MILK && h $!=2)\{$

return false;

$\}$

$//$ The owner who smokes Bluemasters drinks beer

if $($value $==$ BEER && houses$[$h$][$SMOKES$]!=$ NONE && houses$[$h$][$SMOKES$]!=$ BLUEMASTERS$)\{$

return false;

$\}$

$//$ The man who smokes Blends has a neighbor who drinks water

if $($value $==$ WATER && $($h $==0||$ h $==4||$ houses$[$h $-1][$SMOKES$]!=$ NONE && houses$[$h $-1][$SMOKES$]!=$ BLENDS$)$ && $($h $==4||$ h $==0||$ houses$[$h $+1][$SMOKES$]!=$ NONE && houses$[$h $+1][$SMOKES$]!=$ BLENDS$))\{$

return false;

$\}$

break;

case SMOKES:

$//$ The person who smokes Pall Mall rears birds

if $($value $==$ PALLMALLS && houses$[$h$][$PET$]!=$ NONE && houses$[$h$][$PET$]!=$ BIRD$)\{$

return false;

$\}$

$//$ The owner of the yellow house smokes Dunhills

if $($value $==$ DUNHILLS && houses$[$h$][$COLOR$]!=$ NONE && houses$[$h$][$COLOR$]!=$ YELLOW$)\{$

return false;

$\}$

$//$ The man who smokes Blends li