Alexa with Dropwizard for Java Speechlets
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Alexa with Dropwizard for Java Speechlets

Preperation for Development

To test your application with the Alexa test environment provided by, you can redirect all the request to your local machine. Therefore you need a ssl certificate, portforwarding from you router to your machine (443 --> 8443) and optionally a dyndns.

Create Certificate

Create a new folder ("cert").

mkdir cert

cd cert

Generate an RSA private key.

openssl genrsa -out private-key.pem 2048

Create a new file called configuration.cnf

touch configuration.cnf

Copy, paste and adjust the following to the configuration.cnf file:

distinguished_name = req_distinguished_name
x509_extensions = v3_req
prompt = no

C = DE
ST = B
L = Berlin
O = MyCompanyIsCool
CN = My Awesome Skill

keyUsage = keyEncipherment, dataEncipherment
extendedKeyUsage = serverAuth
subjectAltName = @subject_alternate_names

DNS.1 =

In the config file nothing is really important, beside the DNS.

openssl req -new -x509 -days 365 -key private-key.pem -config configuration.cnf -out certificate.pem

openssl pkcs12 -export -in certificate.pem -inkey private-key.pem -out pkcs.p12 -name cert -password pass:password1

Generate the keystore with keytool:

keytool -deststorepass password1 -importkeystore -destkeypass password1 -destkeystore keystore.jks -srckeystore pkcs.p12 -srcstoretype PKCS12 -srcstorepass password1 -alias cert

Put the keystore.jks into project root and set password in src/dist/config.yml

cp keystore.jks ../dropwizard/

cd ../dropwizard/

nano src/dist/config.yml

Now go pack to the "cert" folder and copy the content of your certificate.pem. Now go to and open you skill. On the left side click "SSL Certificate". Select "I will upload a self-signed certificate in X.509 format." and paste it in the field below.

Run the application locally

Go to the project root directory

Run the application

./gradlew run

or if you have gradle installed

gradle run

Test the server by calling:

If you set up the dyndns and the port-forwarding correctly, you should be able to see incoming requests in the console.

For development IntelliJ IDEA is recommended.

Publish as Lambda function

Deploying your code to AWS Lambda has many advantages (no server maintenance, costs, etc.). The gradle tasks "shadowJar" will create a JAR including all dependencies that you specified in the alexa project. The settings for the AWS Lambda service are:

Runtime: Java 8
Handler: de.hennroja.alexaskill.Handler

Generate the jar by calling

./gradlew shadowJar

Find the jar file in


Now simply upload the jar and trigger a last test.

Keep in mind that you have to change the endpoint address from HTTPS + your dyndns to the lambda function. Alternatively you can create a new skill and copy intent schema + utterances.