Discussion:
[Cucumber] Expressions in Java
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Tim Walker
2018-06-18 18:22:50 UTC
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Hello,



I’m using cucumber expressions snd am struggling getting the basics
working. I am not sure if I am doing it right as there was a little
confusion around just providing the expression class like regular glue code
(and it seems so simple!). Perhaps some can shed some light.



With this Gherkin:

Given a customer has a savings account

Given a customer has a checking account



And this step:

@Given("a customer has a {account_type} account")

public void a_customer_has_a_account(AccountType account_type) {

System.out.println("Has an account type: " + account_type);

}



And this entry in config\cucumber.yml:

typeRegistry.defineParameterType(new ParameterType<>(

"account_type", // name

"savings|checking", // regexp

AccountType.class, // type

AccountType::new // transformer function

))



With this inner-class in the steps file:

public class AccountType {

String accountType;

AccountType(String accountType) {

this.accountType = accountType;

}

}



I get this:

Exception in thread "main" cucumber.runtime.CucumberException: Could not
create a cucumber expression for 'a customer has a {account_type} account'.

It appears you did not register parameter type. The details are in the
stacktrace below.

You can find the documentation here: https://docs.cucumber.io/
cucumber/cucumber-

expressions/

at io.cucumber.stepexpression.StepExpressionFactory.
registerTypeInConfiguration(StepExpressionFactory.java:87)

at io.cucumber.stepexpression.StepExpressionFactory.
createExpression(StepExpressionFactory.java:65)

at io.cucumber.stepexpression.StepExpressionFactory.
createExpression(StepExpressionFactory.java:54)



*--*
Tim
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Björn Rasmusson
2018-06-18 19:19:13 UTC
Permalink
Post by Tim Walker
Hello,
I’m using cucumber expressions snd am struggling getting the basics
working. I am not sure if I am doing it right as there was a little
confusion around just providing the expression class like regular glue code
(and it seems so simple!). Perhaps some can shed some light.
Given a customer has a savings account
Given a customer has a checking account
@Given("a customer has a {account_type} account")
public void a_customer_has_a_account(AccountType account_type) {
System.out.println("Has an account type: " + account_type);
}
Cucumber-JVM does not use cucumber.yml. The java-calculator example uses
ParameterTypes.java
<https://github.com/cucumber/cucumber-jvm/blob/master/examples/java-calculator/src/test/java/cucumber/examples/java/calculator/ParameterTypes.java>
to define parameter types.

/Björn
Post by Tim Walker
typeRegistry.defineParameterType(new ParameterType<>(
"account_type", // name
"savings|checking", // regexp
AccountType.class, // type
AccountType::new // transformer function
))
public class AccountType {
String accountType;
AccountType(String accountType) {
this.accountType = accountType;
}
}
Exception in thread "main" cucumber.runtime.CucumberException: Could not
create a cucumber expression for 'a customer has a {account_type} account'.
It appears you did not register parameter type. The details are in the
stacktrace below.
https://docs.cucumber.io/cucumber/cucumber-
expressions/
at
io.cucumber.stepexpression.StepExpressionFactory.registerTypeInConfiguration(StepExpressionFactory.java:87)
at
io.cucumber.stepexpression.StepExpressionFactory.createExpression(StepExpressionFactory.java:65)
at
io.cucumber.stepexpression.StepExpressionFactory.createExpression(StepExpressionFactory.java:54)
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Tim
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Tim Walker
2018-06-18 20:00:00 UTC
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Björn thank you. [tim] below inline...
Post by Björn Rasmusson
Post by Tim Walker
Hello,
I’m using cucumber expressions snd am struggling getting the basics
working. I am not sure if I am doing it right as there was a little
confusion around just providing the expression class like regular glue code
(and it seems so simple!). Perhaps some can shed some light.
Given a customer has a savings account
Given a customer has a checking account
@Given("a customer has a {account_type} account")
public void a_customer_has_a_account(AccountType account_type) {
System.out.println("Has an account type: " + account_type);
}
Cucumber-JVM does not use cucumber.yml. The java-calculator example uses
ParameterTypes.java
<https://github.com/cucumber/cucumber-jvm/blob/master/examples/java-calculator/src/test/java/cucumber/examples/java/calculator/ParameterTypes.java>
to define parameter types.
[Tim] Thank you very much. This is not at all obvious as the stack trace
"Register Type In Configuration" - sure looks like it wants to give it a go
from the YML! So, to be clear, don;t register parameter types using
profiles or configurations but, rather, leave an "extended
ParameterType.java" in the path to do the deed? Thanks again. Tim
Post by Björn Rasmusson
/Björn
Post by Tim Walker
typeRegistry.defineParameterType(new ParameterType<>(
"account_type", // name
"savings|checking", // regexp
AccountType.class, // type
AccountType::new // transformer function
))
public class AccountType {
String accountType;
AccountType(String accountType) {
this.accountType = accountType;
}
}
Exception in thread "main" cucumber.runtime.CucumberException: Could not
create a cucumber expression for 'a customer has a {account_type} account'.
It appears you did not register parameter type. The details are in the
stacktrace below.
You can find the documentation here: https://docs.cucumber.
io/cucumber/cucumber-
expressions/
at io.cucumber.stepexpression.StepExpressionFactory.
registerTypeInConfiguration(StepExpressionFactory.java:87)
at io.cucumber.stepexpression.StepExpressionFactory.
createExpression(StepExpressionFactory.java:65)
at io.cucumber.stepexpression.StepExpressionFactory.
createExpression(StepExpressionFactory.java:54)
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Tim
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