Created attachment 769 [details]
Source file

Noticed using 2.3.2. as available on http://jogamp.org/deployment/jogamp-current/archive/.

The following code in a GLEventListener produces an error :

public class MyGLEventListener implements GLEventListener {
public void display (GLAutoDrawable drawable) {
GL2ES2 gl = drawable.getGL ().getGL2ES2();
ShaderCode fs;
String[][] fsCode = {{"void main (void) { gl_FragColor = vec4 (1.0, 0.0, 0.0, 1.0); }"}}; 
fs = new ShaderCode (GL2ES2.GL_FRAGMENT_SHADER, 1, fsCode);
fs.compile (gl, System.out);
}
//...
}

The error message is :

Shader status invalid:
ERROR: 0:1: 'gl_FragColor' : undeclared identifier
ERROR: 0:1: 'assign' :  cannot convert from 'const 4-component vector of float' to 'float'

But it works fine when using GL2 instead of GL2ES2 :

public class MyGLEventListener implements GLEventListener {
public void display (GLAutoDrawable drawable) {
GL2 gl = drawable.getGL ().getGL2();
ShaderCode fs;
String[][] fsCode = {{"void main (void) { gl_FragColor = vec4 (1.0, 0.0, 0.0, 1.0); }"}}; 
fs = new ShaderCode (GL2.GL_FRAGMENT_SHADER, 1, fsCode);
fs.compile (gl, System.out);
}
//...
}

Full code attached.