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java.lang.ClassCastException: software.amazon.awscdk.services.lambda.LambdaRuntime cannot be cast to software.amazon.awscdk.services.lambda.InlinableJavascriptLambdaRuntime #504

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eranation opened this issue Aug 3, 2018 · 1 comment · Fixed by #505
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java.lang.ClassCastException: software.amazon.awscdk.services.lambda.LambdaRuntime cannot be cast to software.amazon.awscdk.services.lambda.InlinableJavascriptLambdaRuntime #504

eranation opened this issue Aug 3, 2018 · 1 comment · Fixed by #505

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@eranation
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I was trying to create a new Lambda construct, it compiles well but when running cdk synth I'm getting this error:


Exception in thread "main" java.lang.ExceptionInInitializerError
        at ...MyStack.<init>(MyStack.java:25)
        at ..MyApp.<init>(MyApp.java:11)
        at ..MyApp.main(MyApp.java:15)
Caused by: java.lang.ClassCastException: software.amazon.awscdk.services.lambda.LambdaRuntime cannot be cast to software.amazon.awscdk.services.lambda.InlinableJavascriptLambdaRuntime
        at software.amazon.awscdk.services.lambda.LambdaRuntime.<clinit>(LambdaRuntime.java:11)
        ... 3 more

The code is simply


    Lambda lambda = new Lambda("MyLambda",
        LambdaProps.builder()
            .withCode(LambdaCode.file(...))
            .withHandler(...).withRuntime(LambdaRuntime.JAVA8)
            .build()
eladb pushed a commit that referenced this issue Aug 3, 2018
fix(aws-lambda): java - invalid cast for inline LambdaRuntime members
8b9d4b8 
TypeScript uses inference to determine if a cast to an interface is legal but
strongly-typed languages like Java require that the down-casted class will
explicitly implement the interface.

The JavaRuntime class has static members that are down-casted from JavaRuntime
to a set of interfaces, to allow strong-typing of properties for various Lambda
use cases. These down-casts fail in e.g. Java because JavaRuntime doesn't implement
these interfaces explicitly.

We should add a compile-time check in jsii for such a use case.

Fixes #504
This was referenced Aug 3, 2018
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@eladb
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eladb commented Aug 3, 2018

Fix in #505

@eladb eladb closed this as completed in #505 Aug 6, 2018
eladb pushed a commit that referenced this issue Aug 6, 2018
fix(aws-lambda): java - invalid cast for inline LambdaRuntime members (…
bd18456 
…#505)

TypeScript uses inference to determine if a cast to an interface is legal but
strongly-typed languages like Java require that the down-casted class will
explicitly implement the interface.

The JavaRuntime class has static members that are down-casted from JavaRuntime
to a set of interfaces, to allow strong-typing of properties for various Lambda
use cases. These down-casts fail in e.g. Java because JavaRuntime doesn't implement
these interfaces explicitly.

We should add a compile-time check in jsii for such a use case.

Fixes #504
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fix(aws-lambda): java - invalid cast for inline LambdaRuntime members aws/aws-cdk
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@eladb @eranation