Sample form submit java code, refer https://webfirmframework.github.io for developers guide

SampleFormTemplate.java

import java.util.logging.Logger;

import com.webfirmframework.wffweb.tag.html.AbstractHtml;
import com.webfirmframework.wffweb.tag.html.Br;
import com.webfirmframework.wffweb.tag.html.attribute.Checked;
import com.webfirmframework.wffweb.tag.html.attribute.Name;
import com.webfirmframework.wffweb.tag.html.attribute.Type;
import com.webfirmframework.wffweb.tag.html.attribute.core.AbstractAttribute;
import com.webfirmframework.wffweb.tag.html.attribute.event.ServerAsyncMethod;
import com.webfirmframework.wffweb.tag.html.attribute.event.form.OnSubmit;
import com.webfirmframework.wffweb.tag.html.formsandinputs.Button;
import com.webfirmframework.wffweb.tag.html.formsandinputs.Form;
import com.webfirmframework.wffweb.tag.html.formsandinputs.Input;
import com.webfirmframework.wffweb.tag.html.stylesandsemantics.Div;
import com.webfirmframework.wffweb.tag.htmlwff.NoTag;
import com.webfirmframework.wffweb.wffbm.data.BMValueType;
import com.webfirmframework.wffweb.wffbm.data.WffBMObject;

@SuppressWarnings("serial")
public class SampleFormTemplate extends Div implements ServerAsyncMethod {
	
	private static final Logger LOGGER = Logger.getLogger(SampleFormTemplate.class.getName());

	public SampleFormTemplate(AbstractHtml parent, AbstractAttribute... attributes) {
		super(parent, attributes);
		develop();
	}

	private void develop() {
		
		final Type typeText = new Type(Type.TEXT);
		
		Form form = new Form(this) {{
			
			new NoTag(this, "First name: ");
			new Input(this,
				typeText,
				new Name("firstName"));
			
			new Br(this);
			
			new NoTag(this, "Last name: ");
			new Input(this,
				typeText,
				new Name("lastName"));
			
			new Br(this);
			
			new NoTag(this, "Agree Conditions: ");
			new Input(this,
					new Type(Type.CHECKBOX),
					new Name("agreeTC"),
					new Checked());
			
			new Br(this);
			
			new Button(this,
				new Type(Type.SUBMIT)) {{
				new NoTag(this, "Post");	
			}};
			
		}};
			
		OnSubmit onSubmit = new OnSubmit("console.log('start loading icon'); event.preventDefault(); return true;", this, 
				"return ".concat(form.getNameBasedJsObject()).concat(";"), 
				"console.log('stop loading icon'); alert(jsObject.msg);");
		
		form.addAttributes(onSubmit);

	}

	@Override
	public WffBMObject asyncMethod(WffBMObject wffBMObject, Event event) {
		
		String firstName = (String) wffBMObject.getValue("firstName");
		String lastName = (String) wffBMObject.getValue("lastName");
		boolean agreeTC = (boolean) wffBMObject.getValue("agreeTC");
		
		LOGGER.info("firstName: " + firstName);
		LOGGER.info("lastName: " + lastName);
		LOGGER.info("agreeTC checked: " + agreeTC);
		
		WffBMObject result = new WffBMObject();
		
		result.put("msg", BMValueType.STRING, "Successfully submitted!");
		
		return result;
	}
}

Developers guide to get started

Convert HTML5 to webfirmframework Java Code