Shader problem

int shaderProgram = ARBShaderObjects.glCreateProgramObjectARB(); // program
FragmentShader post_pass = new FragmentShader("shaders/post_pass.frag");
post_pass.attach(shaderProgram); // what this does: ARBShaderObjects.glAttachObjectARB(program,id);

int texID =     ARBShaderObjects.glGetUniformLocationARB(post_pass.id, "renderedTexture");
int timerID =   ARBShaderObjects.glGetUniformLocationARB(post_pass.id, "time");

System.out.println("texid location = "+texID);
System.out.println("timerid location = "+texID);

/* Output
texid location = -1
timerid location = -1
*/