Geb Binding

[Varun Jain]

My automation tests use Cucumber and Geb. I am trying to create a browser object at the beginning of my test execution in the cucumber before hooks. To share the browser object, I am trying to use Geb biding but when I create a class variable bindingUpdater and then trying to use it then I am getting error.  Can someone help me and explain what is going on. Should I only be using the env.groovy file to use binding?

Following is the code which I am trying in my machine ( copied the code from Marcin's repo https://github.com/geb/geb-example-gradle/tree/master/src/test)

package hooks

import geb.Browser
import geb.binding.BindingUpdater
import io.cucumber.java.After
import io.cucumber.java.AfterStep
import io.cucumber.java.Before
import io.cucumber.java.BeforeStep

class Hooks {

    BindingUpdater bindingUpdater
    Browser theBrowser

    @Before
    public void createBrowser() {
        if (!bindingUpdater.binding.hasVariable('browser')) {
            theBrowser = new Browser()
            bindingUpdater = new BindingUpdater(bindingUpdater.binding, theBrowser)
            bindingUpdater.initialize()
        } else {
            // save for later screenshot taking
            theBrowser = browser
        }

        go "/cart"
    }

Error 

      java.lang.NullPointerException: Cannot get property 'binding' on null object

at org.codehaus.groovy.runtime.NullObject.getProperty(NullObject.java:60)

at org.codehaus.groovy.runtime.InvokerHelper.getProperty(InvokerHelper.java:190)

at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGroovyObjectGetProperty(AbstractCallSite.java:304)

at hooks.Hooks.createBrowser(Hooks.groovy:17)

at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.base/java.lang.reflect.Method.invoke(Method.java:566)

at cucumber.runtime.Utils$1.call(Utils.java:26)

at cucumber.runtime.Timeout.timeout(Timeout.java:16)

Varun

[Marcin Erdmann]

Hi Varun,

It looks like you're getting a null pointer exception which isn't surprising to me at all because you're not initialising the `bindingUpdater` variable anywhere and you are attempting to access a property of it. 

To be honest, I've never really used Cucumber for anything meaningful. All of the experience I have with it is keeping the project at https://github.com/geb/geb-example-cucumber-jvm, which was contributed by a community member, working as I release new versions of Geb. I can see that you are using what looks like a "hooks class" to me as opposed to using a script at src/cucumber/resources/env/env.groovy like in the example but I don't know which one is more "correct" for a cucumber project that is being bootstrapped at this point in time. I think this is a question which can probably only be answered by somebody with more knowledge about using Cucumber especially with Groovy.

Cheers,
Marcin

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