Play framework 2.0 Form.bindFromRequest().get() returns empty model

Question

I need to receive same POST data from a socket communication.

This is the code that send the POST and receive the response, and seems to work correctly:

String data = "t=" + URLEncoder.encode("Title", "UTF-8") +
    "&u=" + URLEncoder.encode("http://www.myurl.com", "UTF-8");

URL url = new URL("http://localhost:9000/adserver");
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write(data);
wr.flush();

BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String output = "Data received\r\n", line;
while ((line = rd.readLine()) != null) {
    output += line;
}
wr.close();
rd.close();

return ok(output);

This is the code that receive the POST:

Form<AdRequest> form = form(AdRequest.class).bindFromRequest();

if(form.hasErrors()) {
    return badRequest("error");
} else {
    AdRequest adr = form.get();
    return ok(adr.t + " - " + adr.u);
}

The AdRequest model is defined in this way:

public class AdRequest {
    public String t;
    public String u;
}

The form object receive the data because I can see them in debug, but the adr object returned by the get() method contains only null values:

adr = {
    t: null,
    u: null
}

Instead, if I use this code to read the data it works correctly:

Map<String, String[]> asFormUrlEncoded = request().body().asFormUrlEncoded();
return ok(asFormUrlEncoded.get("t")[0] + " - " + asFormUrlEncoded.get("u")[0]);

What I'm doing wrong? Is it a Play Framework bug?

Thanks.

Answer 1

The problem for me, it seems, was that Eclipse was interfering with the code generation and generally messing up the generated bytecode.

Turning off "Build Automatically" in Eclipse fixed the problem.

This Link helped: https://groups.google.com/forum/?fromgroups#!topic/play-framework/JYlkz_Nh31g

Answer 2

This question is very old, but I'll describe our issue, just in case anyone is in the same situation.

Short answer

Try adding setters AdRequest .

Long answer

I've found that now the form model classes need setters or Play won't fill them. I don't know why. For some colleages, the code works like before, and for me, Play wants setters. No idea.

Debugging Form.bindFromRequest , it eventually reaches this line:

package org.springframework.beans;

class BeanWrapperImpl {
    ...
    private void setPropertyValue(BeanWrapperImpl.PropertyTokenHolder tokens, PropertyValue pv) throws BeansException {
        ...
        throw new NotWritablePropertyException(this.getRootClass(), this.nestedPath + propertyName, matches.buildErrorMessage(), matches.getPossibleMatches());

And matches.buildErrorMessage() builds a message like this:

Bean property email is not writable or has an invalid setter method

After adding the setters (eg setEmail ) it works.

Update:

We've found that the form binding depends on the spring framework version. We were using 4.0.3-RELEASE and then we updated to 4.0.5-RELEASE , and that's when the Play forms started to fail.