is there no BOM for com.amazonaws

Question

I’m failry new to AWS developer space. I’m struggling to find the suitable versions of all required dependencies.

I created a simple lambda with folowwing versions of core and even dependencies

<dependency>
      <groupId>com.amazonaws</groupId>
      <artifactId>aws-lambda-java-core</artifactId>
      <version>1.2.1</version>
    </dependency>
    <dependency>
      <groupId>com.amazonaws</groupId>
      <artifactId>aws-lambda-java-events</artifactId>
      <version>3.6.0</version>
    </dependency>

This all works fine,but now if I want to create a labmda with enough depdendencies, how do I get compatible versions.

We do have bom for aws sdk like below.

<groupId>software.amazon.awssdk</groupId>
<artifactId>bom</artifactId>

Do we have any BOM for com.amazonaws that I can use to have compatible versions of dynammoDb, events & lambda-core ? the software.amazon.awssdk:bom does not have required lambda-core event etc.

Answer 1

No, you are expected to maintain your local BOM.

You should refer to their readme.md.

Apparently this issue was once raised in aws-lambda-java-libs.

Answer 2

You can use a dictionary to accumulate rows where the first two columns match. In this case we use a defaultdict with a list as the value type.

import csv
from collections import defaultdict

tmp = defaultdict(list)
with open("foo.csv", "r") as fin:
    reader = csv.reader(fin)
    for line in reader:
        a,b,val = line
        key = (a, b)
        tmp[key].append(val)

print(tmp)
defaultdict(list,
            {('A', '1'): ['X', 'Y', 'Y'],
             ('B', '0'): ['Y'],
             ('C', '0'): ['Z', 'X'],
             ('A', '0'): ['Z', 'Z']})

with open("outfile.csv", "w") as fout:
    writer = csv.writer(fout)
    for k, v in tmp.items():
        row = list(k) + v
        writer.writerow(row)

"""
A,1,X,Y,Y
B,0,Y
C,0,Z,X
A,0,Z,Z
"""