Error in dynamoDB mapper scan() : java.lang.NullPointerException: null

Question

I am getting below error while calling

dynamoDBMapper.scan(Person.class, new DynamoDBScanExpression())

java.lang.NullPointerException: null
    at com.amazonaws.services.dynamodbv2.model.ScanRequest.setScanFilter(ScanRequest.java)
    at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper.createScanRequestFromExpression(DynamoDBMapper.java:1692)
    at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper.scan(DynamoDBMapper.java:1569)
    at com.amazonaws.services.dynamodbv2.datamodeling.AbstractDynamoDBMapper.scan(AbstractDynamoDBMapper.java:236)

With the same dynamoDBMapper, dynamoDBMapper.save(person1) is working fine.

The NullPointerExecption is coming inside of ScanRequest.setScanFilter method of the AWS SDK.

Although, the method setScanFilter has only one line of code, the stacktrace is not showing the line-number where the exception occurred.

The method ScanRequest.setScanFilter looks like this.

public void setScanFilter(java.util.Map<String, Condition> scanFilter) {
    this.scanFilter = scanFilter;
}

Not sure how this.scanFilter = scanFilter can cause a NullPointerException

Spring Boot - 2.2.6.RELEASE
DynamoDB SDK - 1.11.555
Java - Corretto-8.242.08.1

As a side note, the v1 AWS SDKs are pretty awful, and I strongly recommend using the v2 if possible. — chrylis -cautiouslyoptimistic-, Nov 30 '20 at 05:53
Is there something removing the parts ot the stacktrace by chance? — Darren Forsythe, Nov 30 '20 at 06:07

score 0 · Answer 1 · answered Feb 09 '21 at 18:04

0

@ShrinivasShukla I also found the NPE when Contrast is wired up in Application. In my case Probably Contrast is disabling/blocking scanRequest.setScanFilter(scanExpression.getScanFilter() to work.

answered Feb 09 '21 at 18:04

Shubham srivastava

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Error in dynamoDB mapper scan() : java.lang.NullPointerException: null

1 Answers1