Posted by Danny02 on Feb 12, 2013; 2:55pm
URL: https://forum.jogamp.org/What-can-i-await-as-status-after-linking-shaders-tp4028126p4028204.html

I check for shader errors like this:
int programObject=...;
gl.glValidateProgram(programObject);
        int[] error = new int[]{-1};
        gl.glGetProgramiv(programObject, GL2GL3.GL_LINK_STATUS, error, 0);
        if (error[0] != GL.GL_TRUE) {
            int[] len = new int[1];
            gl.glGetProgramiv(programObject, GL2ES2.GL_INFO_LOG_LENGTH, len, 0);
            if (len[0] == 0) {
                return null;
            }
            byte[] errormessage = new byte[len[0]];
            gl.glGetProgramInfoLog(programObject, len[0], len, 0, errormessage, 0);
            return new String(errormessage, 0, len[0]);
        }

and for the single shaderobjects(fragment, vertex ...)
it is qutie similiar:

int[] error = new int[]{-1};
        gl.glGetShaderiv(shader, GL2ES2.GL_COMPILE_STATUS, error, 0);

        if (error[0] != GL.GL_TRUE) {
            int[] len = new int[1];
            gl.glGetShaderiv(shader, GL2ES2.GL_INFO_LOG_LENGTH, len, 0);
            if (len[0] == 0) {
                return null;
            }
            byte[] errormessage = new byte[len[0]];
            gl.glGetShaderInfoLog(shader, len[0], len, 0, errormessage, 0);

            return new String(errormessage, 0, len[0] + 1);
}