Bump GLSL problem

[Vertex Shader]


varying vec3 lightVec;
varying vec3 eyeVec;
varying vec2 texCoord;
attribute vec3 vTangent;


void main(void)
{
	gl_Position = ftransform();
	texCoord = gl_MultiTexCoord0.xy;

	vec3 n = normalize(gl_NormalMatrix * gl_Normal);
	vec3 t = normalize(gl_NormalMatrix * vTangent);
	vec3 b = cross(n, t);

	vec3 vVertex = vec3(gl_ModelViewMatrix * gl_Vertex);
	vec3 tmpVec = gl_LightSource[0].position.xyz - vVertex;

	lightVec.x = dot(tmpVec, t);
	lightVec.y = dot(tmpVec, b);
	lightVec.z = dot(tmpVec, n);

	tmpVec = -vVertex;
	eyeVec.x = dot(tmpVec, t);
	eyeVec.y = dot(tmpVec, b);
	eyeVec.z = dot(tmpVec, n);
}


[Pixel Shader]




varying vec3 lightVec;
varying vec3 eyeVec;
varying vec2 texCoord;
uniform sampler2D colorMap;
uniform sampler2D normalMap;
uniform float invRadius;

void main (void)
{
	float distSqr = dot(lightVec, lightVec);
	float att = clamp(1.0 - invRadius * sqrt(distSqr), 0.0, 1.0);
	vec3 lVec = lightVec * inversesqrt(distSqr);

	vec3 vVec = normalize(eyeVec);

	vec4 base = texture2D(colorMap, texCoord);

	vec3 bump = normalize( texture2D(normalMap, texCoord).xyz * 2.0 - 1.0);

	vec4 vAmbient = gl_LightSource[0].ambient * gl_FrontMaterial.ambient;

	float diffuse = max( dot(lVec, bump), 0.0 );

	vec4 vDiffuse = gl_LightSource[0].diffuse * gl_FrontMaterial.diffuse *
					diffuse;

	float specular = pow(clamp(dot(reflect(-lVec, bump), vVec), 0.0, 1.0),
	                 gl_FrontMaterial.shininess );

	vec4 vSpecular = gl_LightSource[0].specular * gl_FrontMaterial.specular *
					 specular;

	gl_FragColor = ( vAmbient*base +
					 vDiffuse*base +
					 vSpecular) * att;
}






[OpenGL code (JOGL)]

public void drawModel(GL2 gl)
	{

		ConstructInterleavedArray(gl);

		gl.glEnable(GL2.GL_CULL_FACE);
			gl.glCullFace(GL2.GL_BACK);
			gl.glPolygonMode(GL2.GL_FRONT, GL2.GL_TRIANGLES);

			gl.glActiveTexture(GL2.GL_TEXTURE0);
			texture.enable(gl);
			texture.bind(gl);
			gl.glUniform1i(texture.getTextureObject(gl),0);

			gl.glActiveTexture(GL2.GL_TEXTURE1);
			normalMap.enable(gl);
			normalMap.bind(gl);
			gl.glUniform1i(normalMap.getTextureObject(gl),0);

			gl.glDrawArrays(FaceFormat, 0, PolyCount * FaceMultiplier);

		gl.glDisable(GL2.GL_CULL_FACE);
	}