[JVM] Java 8 support

[aslak hellesoy]

Hi everyone,

Wouldn't it be nice to use Java 8 closures for step definitions and hooks?

        Given("I have (\\d+) cukes in my (.*)", (Integer cukes, String what) -> {

            assertEquals(42, cukes.intValue());

            assertEquals("belly", what);

        });

Well, we're pretty close to that on the java8 branch of cucumber-jvm.

There is one annoying thing with the current implementation - we don't have state isolation yet. What this means is that several scenarios won't have isolated state. This is obviously no good, so I'm hoping the community can help.

I like illustrating problems with a failing scenario, and here it is:

https://github.com/cucumber/cucumber-jvm/commit/aa5ce2b68201a631eda13c10e6a5a12c03b9d64a

This lives on the java8-state branch.

Any suggestions how we can deal with this? Any smart hacks? Should we design the API differently?

Aslak

[aslak hellesoy]

I came up with a fix for Java 8 lambda stepdefs, and this is now on the master branch. You'll have it in the next release, but you can already try out 1.2.1-SNAPSHOT. Here is an example:

https://github.com/cucumber/cucumber-jvm/blob/master/java8/src/test/java/cucumber/runtime/java8/test/LambdaStepdefs.java

The implementation is using some clever tricks and unofficial APIs, so this will only work on Oracle and Open JDK.

Would love some feedback on this!

Aslak

[Rakesh]

Hi,

I would like to point out that right now Android only support Java api 6.

Writing cucumber code that runs on the device (ie android
instrumentation tests as opposed to using appium for example),
probably won't work.

R

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[Aslak Hellesøy]

On Saturday, 13 December 2014 at 11:14, Rakesh wrote:

Hi,

I would like to point out that right now Android only support Java api 6.

Writing cucumber code that runs on the device (ie android

instrumentation tests as opposed to using appium for example),

probably won't work.

Yes we know that, so Android will have to use the annotated method style. The old style isn't going away.

Sorry fir any confusion

[Anderson Fernandes]

Is it possible to use DataTable with lambda expressions?

[Anderson Fernandes]

I'd like to point that there's a bug while counting the parameters for the Java8StepDefinition.

The "parameterInfos" is being populated with the types from the lambda expression but this information is not being used in the "getParameterCount" method.

This means lambda expressions will not work for DataTable.

Anderson

On Friday, 12 December 2014 13:23:44 UTC, Aslak Hellesøy wrote: