Formio, form definition and binding library for Java platform
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Formio Build Status Maven Central

Form definition and binding library for Java platform:

  • Easy-to-use configurable handy tool.
  • Automatic binding, even to immutable objects, collections and arrays, nested objects and lists of them.
  • Support for (non)default constructors, static factory methods.
  • Primitives can be used everywhere.
  • Validation of form data (both bean validation API annotations and net.formio.validation.Validator can be used).
  • Seamless support for file uploads and configurable max. request/file size.
  • Form definitions are immutable, composable, self-contained, can be easily shared and cached.
  • Automatic generating of form markup (or its parts) can be optionally used.
  • One simple entry point to API: Forms class.
  • Non-invasive, easy integration with frameworks, minimum dependencies.
  • Usable with various template frameworks, in environments with or without servlets, portlets, also in desktop applications.
  • Simply unit testable forms.
  • Protection of forms against CSRF attacks.
  • Inspired mainly by well-designed Play framework.

Available in Maven Central|ga|1|net.formio

Get Started and Documentation

Demo, sources on

First Touch

1) Prepare form definition (optional automatic mapping of properties):

private static final FormMapping<Person> personForm =
  Forms.automatic(Person.class, "person").build();

2) Fill it with data:

FormData<Person> formData = new FormData<Person>(person, ValidationResult.empty);
FormMapping<Person> filledForm = personForm.fill(formData);
// Push the filled form into a template, use its properties to render it; 
// or use BasicFormRenderer to generate form markup automatically

3) Bind data edited by user back into an object:

FormData<Person> formData = personForm.bind(new ServletRequestParams(request));
if (formData.isValid()) {
 // save the person: formData.getData()
} else {
 // show again the invalid form with validation messages
 // personForm.fill(formData) ...

Maintenance of library

Gradle Build

  • Build artifacts (jar, sources, javadoc): gradle clean assemble
  • Import into Eclipse: gradle cleanEclipse eclipse
  • Run tests: gradle test
  • Perform release: gradle clean release
  • Installation to local Maven repository (e.g. for testing snapshots): gradle install


  • Just run: gradle clean test assemble to see all is ok and ready for release.
  • Run: gradle clean release
    • This automatically executes also uploadArchives (upload to Maven central) after the release version is created
  • Push commits from Gradle release plugin to GitHub
  • Login to, "Close" the Staging repository for library, "Refresh" it and "Release" it.

See and for details.


  • Deleting tag in remote repository:
git tag -d formio-x.y.z
git push master :refs/tags/formio-x.y.z