Cannot insert items into dynamodb through a lambda function using java eclipse

Question

i am trying to insert items into dynamodb through a lambda function. i have given all the required credentials required for creating the iam role and lambda function. but my program throws the following exception

{
  "errorMessage": "com/amazonaws/client/builder/AwsSyncClientBuilder",
  "errorType": "java.lang.NoClassDefFoundError",
  "stackTrace": [
    "java.lang.ClassLoader.defineClass1(Native Method)",
    "java.lang.ClassLoader.defineClass(ClassLoader.java:763)",
    "java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)",
    "java.net.URLClassLoader.defineClass(URLClassLoader.java:467)",
    "java.net.URLClassLoader.access$100(URLClassLoader.java:73)",
    "java.net.URLClassLoader$1.run(URLClassLoader.java:368)",
    "java.net.URLClassLoader$1.run(URLClassLoader.java:362)",
    "java.security.AccessController.doPrivileged(Native Method)",
    "java.net.URLClassLoader.findClass(URLClassLoader.java:361)",
    "java.lang.ClassLoader.loadClass(ClassLoader.java:424)",
    "java.lang.ClassLoader.loadClass(ClassLoader.java:357)",
    "com.bridgelabz.LambdaFunctionHandler.handleRequest(LambdaFunctionHandler.java:20)",
    "com.bridgelabz.LambdaFunctionHandler.handleRequest(LambdaFunctionHandler.java:1)"
  ],
  "cause": {
    "errorMessage": "com.amazonaws.client.builder.AwsSyncClientBuilder",
    "errorType": "java.lang.ClassNotFoundException",
    "stackTrace": [
      "java.net.URLClassLoader.findClass(URLClassLoader.java:381)",
      "java.lang.ClassLoader.loadClass(ClassLoader.java:424)",
      "java.lang.ClassLoader.loadClass(ClassLoader.java:357)",
      "java.lang.ClassLoader.defineClass1(Native Method)",
      "java.lang.ClassLoader.defineClass(ClassLoader.java:763)",
      "java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)",
      "java.net.URLClassLoader.defineClass(URLClassLoader.java:467)",
      "java.net.URLClassLoader.access$100(URLClassLoader.java:73)",
      "java.net.URLClassLoader$1.run(URLClassLoader.java:368)",
      "java.net.URLClassLoader$1.run(URLClassLoader.java:362)",
      "java.security.AccessController.doPrivileged(Native Method)",
      "java.net.URLClassLoader.findClass(URLClassLoader.java:361)",
      "java.lang.ClassLoader.loadClass(ClassLoader.java:424)",
      "java.lang.ClassLoader.loadClass(ClassLoader.java:357)",
      "com.bridgelabz.LambdaFunctionHandler.handleRequest(LambdaFunctionHandler.java:20)",
      "com.bridgelabz.LambdaFunctionHandler.handleRequest(LambdaFunctionHandler.java:1)"
    ]
  }
}

here is my code

package com.bridgelabz;

import com.amazonaws.regions.Regions;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDB;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClientBuilder;
import com.amazonaws.services.dynamodbv2.document.DynamoDB;
import com.amazonaws.services.dynamodbv2.document.Item;
import com.amazonaws.services.dynamodbv2.document.Table;
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;

import com.amazonaws.services.lambda.runtime.events.DynamodbEvent;

public class LambdaFunctionHandler implements RequestHandler<DynamodbEvent, Object> {

    @Override
    public Object handleRequest(DynamodbEvent input, Context context) {
        context.getLogger().log("Input: " + input);

        AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().withRegion(Regions.US_WEST_2).build();
        DynamoDB dynamoDB = new DynamoDB(client);
        String tableName = "AddNumbers";

        Table table = dynamoDB.getTable(tableName);
        Model model = new Model();

        int uniqueId = model.getUniqueId();
        int number1 = model.getNumber1();
        int number2 = model.getNumber2();
        int result = number1 + number2;

        Item item = new Item().withPrimaryKey("uniqueId", uniqueId).withNumber("number1", number1)
                .withNumber("number2", number2).withNumber("result1", result);

        table.putItem(item);

        return true;
    }

}

and my model class

package com.bridgelabz;

public class Model {

    int uniqueId;
    int number1;
    int number2;

    public int getUniqueId() {
        return uniqueId;
    }

    public void setUniqueId(int uniqueId) {
        this.uniqueId = uniqueId;
    }

    public int getNumber1() {
        return number1;
    }

    public void setNumber1(int number1) {
        this.number1 = number1;
    }

    public int getNumber2() {
        return number2;
    }

    public void setNumber2(int number2) {
        this.number2 = number2;
    }

}

the table is created beforehand in the dynamodb. i cant seem to understand what i am doing wrong. please help.

The error message is clearly stating that you are missing the com.amazonaws.client.builder.AwsSyncClientBuilder class. Are you testing this locally or running it on AWS? — Mark B
– Mark B, Commented Feb 14, 2017 at 14:22
I am running it on AWS. As for the class I tried including the aws-java-sdk-core-1.11.87.jar file and added it to the build path but still it throws a new error which is concerned with the JSON libraries. As far as i understand these libraries are already included in the AWS SDK so i cant seem to understand the issue. — Khan Suhail Ahmad
– Khan Suhail Ahmad, Commented Feb 15, 2017 at 3:29

Alwyn - Numino Labs · Accepted Answer · 2017-03-01 10:08:18Z

Are you uploading the code using the AWS SDK Eclipse Plugin? Or on your own? (Export JAR, & upload using aws cli).

I wrote a Java Lambda function to accept a row, and enter it into DynamoDB; Exported the code to a JAR using Eclipse Export, and uploaded it to AWS using aws cli and got a NoClassDefError.

Error loading class <xyz>.MFZLambdaStoreEvents: com/amazonaws/AmazonServiceException: class java.lang.NoClassDefFoundError
java.lang.NoClassDefFoundError: com/amazonaws/AmazonServiceException
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)

I do not get the above error, if I just have a simple function with no AWS SDK dependencies....

Then I came across http://docs.aws.amazon.com/toolkit-for-eclipse/v1/user-guide//lambda-tutorial.html And got to understand that I could upload the code directly using options the Eclipse - AWS SDK Plugin.

I tried doing so, and my function now runs successfully.

Some code snippets from my trial code

import com.amazonaws.services.dynamodbv2.AmazonDynamoDB;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;
import com.amazonaws.services.dynamodbv2.model.PutItemRequest;
import com.amazonaws.services.dynamodbv2.model.PutItemResult;
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;

public class LambdaStoreEvents implements RequestHandler<StepsEvent, Response> {

    static AmazonDynamoDB dynamoDB;

    @Override
    public Response handleRequest(StepsEvent event, Context context) {    

    String tableName = "<tablename>";
    Map<String, AttributeValue> item = newItem(event);
    PutItemRequest putItemRequest = new PutItemRequest(tableName, item);

    dynamoDB = AmazonDynamoDBClient.builder().build();
    PutItemResult putItemResult = dynamoDB.putItem(putItemRequest);

    Response response = new Response(putItemResult.toString());

    return response;

}

Collectives™ on Stack Overflow

Cannot insert items into dynamodb through a lambda function using java eclipse

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related