graal-sqs-example

An example of an application that reads from Amazon SQS built as a native image with GraalVM.

Prerequisites

This example requires that you have GraalVM installed on your system.

Building the Example

Run the following command to build the example application as both a JAR distribution and a native image:

./gradlew buildAll

Running the Example

Follow the steps below to run the example:

1. Run the following command to start a mock AWS environment using LocalStack:

     ./gradlew startLocalStack
   

2. Run the following command to execute the application as an Uber Jar on the JVM:

     ./run-uber-jar.sh
   

   If successful, you will see the following in the terminal:

     Connecting to SQS: http://localhost:4566 [us-east-1]
     SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
     SLF4J: Defaulting to no-operation (NOP) logger implementation
     SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
     Checking for messages...
     No messages found... sleeping
   

3. In a new terminal window, run the following command to start the application as a native image:

     ./run-native-image.sh
   

   If successful, you will see the following in the terminal:

     Connecting to SQS: http://localhost:4566 [us-east-1]
     Checking for messages...
     No messages found... sleeping
   

   Notice that you do not see the SLF4J missing configuration error. This is because the reflection has already occurred at compile time.

4. In a new terminal window, run the following command to begin publishing messages to the queue for the readers to receive:

     ./gradlew publishMessages
   

   If successful, you will see both readers printing messages in their terminals:

     Checking for messages...
     message-872
     message-873
     message-874
     message-875
     message-876
     Checking for messages...