JME3 Fragment/Shader not compiling

Here is the fragment shader code (MyShaders/Shader1.frag):

void main(){
   gl_FragColor = vec4(1.0,1.0,1.0,1.0);
}

And the vertex shader code (MyShaders/Shader1.vert):

void main(void)
{

    gl_Position=vec4(1.0,1.0,1.0,0.0);

}

And the .j3md material code:

MaterialDef Shader1 {
    MaterialParameters {
    }

    Technique {
        VertexShader GLSL100 GLSL150:   MyShaders/Shader1.frag
        FragmentShader GLSL100 GLSL150: MyShaders/Shader1.vert
    }
}

The error stack trace is:

WARNING: Bad compile of:
1   #version 110
2   #define FRAGMENT_SHADER 1
3   void main(void)
4   {
5   
6       gl_Position=vec4(1.0,1.0,1.0,0.0);
7   
8   }

May 01, 2018 3:35:57 PM com.jme3.app.LegacyApplication handleError
SEVERE: Uncaught exception thrown in Thread[jME3 Main,5,main]
com.jme3.renderer.RendererException: compile error in: ShaderSource[name=MyShaders/Shader1.vert, defines, type=Fragment, language=GLSL100]
ERROR: 0:6: Use of undeclared identifier 'gl_Position'

And here is the code for instantiating the material:

Material mat=new Material(assetManager,"MyShaders/Shader1.j3md");

I think that the bug is somewhere in me not passing any gl_Position parameters into the shader, but how do I do that?

I am using JME3 and Java.