java - Spring request parameters saved by binder -


i think may have discovered critical bug springs web binder, or more likely, doing horribly wrong. basically, data 1 servlet request somehow copied request.

spring version 4.1.5

i have simple model object 1 parameter.

public class mymodelattribute {  private string mymodelparameter;  public string getmodelparameter() { return mymodelparameter; }  public void setmodelparameter(string mymodelparameter) {     this.mymodelparameter = mymodelparameter; }  }

i intialize binder object in controller

@initbinder("mymodelattribute") protected void initmymodelbinder(webdatabinder binder) { binder.setvalidator(myvalidator); binder.registercustomeditor(string.class, new stringtrimmereditor(false)); }

then there controller method this

public modelandview somerequestmapping(@valid @modelattribute("mymodelattribute") mymodelattribute mymodelattribute,     bindingresult bindingresult) {  ... }

i created test spams controller requests , see horrifying. parameter on model not submitted, rather, different value submitted in earlier request. make 1 user user's data. basically, seems target object on data binder saved earlier. if parameter directly request expected parameter.

the issue stringtrimmer editor... wasnt set posted in code. binder intialization this. , turns out stringtrimmereditor not stateless. answer initialize binder in question. not how below.

@initbinder("mymodelattribute") protected void initmymodelbinder(webdatabinder binder) { binder.setvalidator(myvalidator); binder.registercustomeditor(string.class, string_trimmer); }

the issue better described here https://jira.spring.io/browse/spr-12547


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