Model rendering from +z to -z and rotating around a point doesnt showing.

[Joshi Elijah]

 Hi,

        I am trying to rendering a model but it is projecting behind the camera, i am thinking of the problem being in the projection matrix from the link having the same problem https://stackoverflow.com/questions/23187262/lwjgl-projection-matrix-nothing-happens. I modified the projection matrix but still nothing happens, this is my projection matrix

        private static final float FOV = 70;
	private static final float NEAR_PLANE = 0.1f;
	private static final float FAR_PLANE = 10000;

private void createProjectionMatrix() {
		float aspectRatio = (float) Display.getWidth() / (float) Display.getHeight();
		float y_scale = (float) ((1f / Math.tan(Math.toRadians(FOV / 2f))) * aspectRatio);
		float x_scale = y_scale / aspectRatio;
		float frustum_length = FAR_PLANE - NEAR_PLANE;

		float bottom = -NEAR_PLANE * (float) Math.tan(Math.toRadians(FOV) / 2f);
		float top = -bottom;
		float left = aspectRatio * bottom;
		float right = -left;

		projectionMatrix = new Matrix4f();
		projectionMatrix.m00 = x_scale;
		projectionMatrix.m11 = y_scale;
		projectionMatrix.m20 = (right+left) / (right-left); //
		projectionMatrix.m21 = (top+bottom) / (top-bottom); //
		projectionMatrix.m22 = -((FAR_PLANE + NEAR_PLANE) / frustum_length);
		projectionMatrix.m23 = -1;
		projectionMatrix.m32 = -((2 * NEAR_PLANE * FAR_PLANE) / frustum_length);
		projectionMatrix.m33 = 0;
	}

Can someone help me ?    this is important for me.