LWJGL - Pass value to "in" arguement on shader

Newbie & Debugging Questions
#1

I have create a triangle using a shader which successfully renders on a green background.
(This is a code example from the superbible 6 book)

There is a value on the shader which is suppose to make the triangle move.
But I am unable to assign a floatbuffer to that value.

Here is the shader.


#version 430 core
// "offset" is an input vertex attribute
layout (location = 0) in vec4 offset;
void main(void)
{
const vec4 vertices[3] = vec4[3](vec4( 0.25, -0.25, 0.5, 1.0),
vec4(-0.25, -0.25, 0.5, 1.0),
vec4( 0.25, 0.25, 0.5, 1.0));
// Add "offset" to our hard-coded vertex position
gl_Position = vertices[gl_VertexID] + offset;
}

And here is my (failed) attempt at assigning a value to that shader.


			FloatBuffer attrib = BufferUtils.createFloatBuffer(4);
			float[] move = new float[] { //
			(float) Math.sin(getCurrentTime()) * 0.5f, //
					(float) Math.cos(getCurrentTime()) * 0.6f, 0.0f,//
					0.0f };
			attrib.put(move);
			attrib.flip();
			GameUtils.exitOnGLError("set vertex");

			// Update the value of input attribute 0
			System.out.println(attrib.get(0));
			GL20.glVertexAttrib4f(0, attrib.get(0) * 100, attrib.get(1), 0.0f, 0.0f);

			GameUtils.exitOnGLError("set shader variable");

			// Draw triangle
			GL11.glDrawArrays(GL11.GL_TRIANGLES, 0, 3);

Here is the code to the whole object.
http://pastebin.java-gaming.org/360f7340b97