AWSのlambdaでJavaを使う

ちょっとハマったのでメモ。JavaはMavenでコンパイルします。

Test.java


package com.example;

import java.util.Iterator;
import java.util.Map;

import com.amazonaws.services.lambda.runtime.Context;

public class Test {
	
	//http://stackoverflow.com/questions/35545642/error-executing-hello-world-for-aws-lambda-in-java
    public String handler(Map<String,Object> input, Context context){
    	String ret="";
    	Iterator<String> ite=input.keySet().iterator();
    	while(ite.hasNext()){
    		String key=ite.next();
    		String val=input.get(key).toString();
    		ret+="("+key+","+val+"),";
    	}
    	return ret;
    }
}

package com.example;

import java.util.Iterator;

import java.util.Map;

import com.amazonaws.services.lambda.runtime.Context;

public class Test {

//http://stackoverflow.com/questions/35545642/error-executing-hello-world-for-aws-lambda-in-java

public String handler(Map<String,Object> input, Context context){

String ret="";

Iterator<String> ite=input.keySet().iterator();

while(ite.hasNext()){

String key=ite.next();

String val=input.get(key).toString();

ret+="("+key+","+val+"),";

}

return ret;

}

pom.xml


<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.example</groupId>
  <artifactId>test</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>Test</name>
  <url>http://example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    
    <dependency>
	    <groupId>com.amazonaws</groupId>
	    <artifactId>aws-lambda-java-core</artifactId>
	    <version>1.0.0</version>
	</dependency>
  </dependencies>
  
  
    <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
        <version>2.3</version>
        <configuration>
          <createDependencyReducedPom>false</createDependencyReducedPom>
        </configuration>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>shade</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>

<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">

<groupId>com.example</groupId>

<version>0.0.1-SNAPSHOT</version>

<url>http://example.com</url>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

</properties>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

</dependency>

<groupId>com.amazonaws</groupId>

<artifactId>aws-lambda-java-core</artifactId>

</dependency>

</dependencies>

<build>

<groupId>org.apache.maven.plugins</groupId>

<artifactId>maven-shade-plugin</artifactId>

<createDependencyReducedPom>false</createDependencyReducedPom>

</configuration>

<phase>package</phase>

<goals>

<goal>shade</goal>

</goals>

</execution>

</executions>

</plugin>

</plugins>

</build>

</project>

コンパイル

mvn package

1	mvn package

Lambdaへアップロード

zipファイルをアップロード
Configulationを設定

Runtime	Java 8
Handler	com.example.Test::handler

これで動きます。テストの際に与えるパラメタの値が表示されます