#1262 new
Ron Gross

NullPointerException from render()

Reported by Ron Gross | November 17th, 2011 @ 05:20 PM

I'm getting a NullPointerException while calling the render() method. I'm trying to use flash with a complex object:

This is my Controller's action:

public static void add() {

Website website = new Website(); // If I remove this line, I get a different error: "Cannot get property 'url' on null object."

// the following line throws an exception


Here is the exception stacktrace:

@68e0e1f98 Internal Server Error (500) for request GET /sites/add

Execution exception (In /app/controllers/Sites.java around line 22)
RuntimeException occured : java.lang.NullPointerException

play.exceptions.JavaExecutionException: java.lang.NullPointerException

at play.mvc.ActionInvoker.invoke(ActionInvoker.java:229)
at Invocation.HTTP Request(Play!)

Caused by: java.lang.RuntimeException: java.lang.NullPointerException

at play.templates.BaseTemplate.throwException(BaseTemplate.java:91)
at play.templates.GroovyTemplate.internalRender(GroovyTemplate.java:252)
at play.templates.Template.render(Template.java:26)
at play.templates.GroovyTemplate.render(GroovyTemplate.java:184)
at play.mvc.results.RenderTemplate.<init>(RenderTemplate.java:24)
at play.mvc.Controller.renderTemplate(Controller.java:659)
at play.mvc.Controller.renderTemplate(Controller.java:639)
at play.mvc.Controller.render(Controller.java:694)
at controllers.Sites.add(Sites.java:22)
at play.mvc.ActionInvoker.invokeWithContinuation(ActionInvoker.java:546)
at play.mvc.ActionInvoker.invoke(ActionInvoker.java:500)
at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:476)
at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:471)
at play.mvc.ActionInvoker.invoke(ActionInvoker.java:159)
... 1 more

Caused by: java.lang.NullPointerException

Related: http://stackoverflow.com/questions/8170373/why-arent-my-play-valida...

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<h2>Play framework</h2>

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<h2>Reporting Security Vulnerabilities</h2> Since all bug reports are public, please report any security vulnerability directly to <em>guillaume dot bort at gmail dot com</em>.<br><br>

<h2>Creating a bug report</h2> Bug reports are incredibly helpful, so take time to report bugs and request features in our ticket tracker. We’re always grateful for patches to Play’s code. Indeed, bug reports with attached patches will get fixed far quickly than those without any.<br><br>

Please include as much relevant information as possible including the exact framework version you're using and a code snippet that reproduces the problem.<br><br>

Don't have too much expectations. Unless the bug is really a serious "everything is broken" thing, you're creating a ticket to start a discussion. Having a patch (or a branch on Github we can pull from) is better, but then again we'll only pull high quality branches that make sense to be in the core of Play.

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