Create minimal proof-of-concept for lambda missing fields bug

See: aws/aws-lambda-java-libs#358

.gitignore

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+/.idea/
+/target/

build_and_run_docker.sh

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+mvn clean verify
+
+echo "Java 8:"
+docker run \
+  -e DOCKER_LAMBDA_DEBUG=true \
+  -v "$PWD/target/classes:/var/task:ro,delegated" \
+  lambci/lambda:java8 \
+  "com.garethdanielsmith.TestLambda" "null"
+
+echo "Java 11:"
+docker run \
+  -e DOCKER_LAMBDA_DEBUG=true \
+  -v "$PWD/target/classes:/var/task:ro,delegated" \
+  lambci/lambda:java11 \
+  "com.garethdanielsmith.TestLambda" "null"

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>com.garethdanielsmith</groupId>
+  <artifactId>java-11-lambda-missing-fields-poc</artifactId>
+  <version>1.0-SNAPSHOT</version>
+
+  <properties>
+    <maven.compiler.source>8</maven.compiler.source>
+    <maven.compiler.target>8</maven.compiler.target>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.amazonaws</groupId>
+      <artifactId>aws-lambda-java-core</artifactId>
+      <version>1.2.1</version>
+    </dependency>
+  </dependencies>
+
+</project>

src/main/java/com/garethdanielsmith/TestChild.java

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+package com.garethdanielsmith;
+
+public class TestChild extends TestParent {
+
+  public String testChild = "_testChild";
+}

src/main/java/com/garethdanielsmith/TestLambda.java

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+package com.garethdanielsmith;
+
+import com.amazonaws.services.lambda.runtime.Context;
+import com.amazonaws.services.lambda.runtime.RequestHandler;
+
+public class TestLambda implements RequestHandler<String,TestParent> {
+
+  @Override
+  public TestParent handleRequest(String input, Context context) {
+    return new TestChild();
+  }
+}

src/main/java/com/garethdanielsmith/TestParent.java

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+package com.garethdanielsmith;
+
+public class TestParent {
+
+  public String parentField = "_parentField";
+}