Why is my uniform not initializing in openGL?

Why are my uniform vector and float not being initialized? My shader code compiles correctly, my shader is compiling properly, but when I try to get the uniform location of my vec4 lightDirection, and floats specularFactor and diffuseFactor, it gives me an error. Note I haven't actually used these uniforms for anything yet, however, that shouldn't matter.

Here is my vertex shader, which gets all uniform locations properly:

#version 330
layout (location = 0) in vec3 position;
layout (location = 1) in vec2 texture_coord;
layout (location = 2) in vec3 normal;
layout (location = 3) in vec3 fNormal;

uniform mat4 worldMat;
uniform mat4 projection;
uniform mat4 transform;

out vec2 tex;
out vec3 n;
out vec3 fn;

void main() {
    fn=fNormal;
    n=normal;
    tex = texture_coord;
    gl_Position = projection * worldMat * transform * vec4(position, 1);

}

Here is my fragment shader, which only gets the texture sample uniform location:

#version 330
uniform sampler2D sampleTexture;
uniform vec4 lightDirection;
uniform float specularFactor;
uniform float diffuseFactor;


in vec2 tex;
in vec3 n;
in vec3 fn;

out vec4 fragColor;

void main() {
    fragColor=texture(sampleTexture, tex);

}

Here is the method I use to get uniform locations (I am using Java):

public int loadUniform(String uniformName)throws Exception{
        int iD= glGetUniformLocation(program,uniformName);
        System.out.println("PROGRAM: "+program+" UNIFORM: "+uniformName+" "+iD);
        if(iD==-1) {
                throw new Exception("uniform:"+uniformName+" not initialized");
        }
        return iD;
}

Now, here is what is printed in console by print statment/exception. Am confusion. Numbers definitely seem wrong, but whatevs. I don't understaaaaand.

java.lang.Exception: uniform:lightDirection not initialized
    at shader_src.Shader.loadUniform(Shader.java:273)
    at shader_src.StaticShader.initValues(StaticShader.java:51)
    at application.Main.main(Main.java:94)
PROGRAM: 4 UNIFORM: worldMat 9
PROGRAM: 4 UNIFORM: projection 5
PROGRAM: 4 UNIFORM: transform 0
PROGRAM: 4 UNIFORM: sampleTexture 4
PROGRAM: 4 UNIFORM: lightDirection -1