Serverless framework - Deploying a function with a different runtime - aws-lambda

Question

I'm using a Serverless framework to deploy multiple Lambda functions in which all of them runs on NodeJS. Now I need to create a new lambda function that runs on Java11 and I want its configuration to be in the same yaml file along with my other lambda functions. My jar file is uploaded to an S3 bucket and I'm referencing that bucket in my Serverless config to fetch the package from there and deploy it to the function, however, it seems like a wrong package is being deployed to my function as I noticed that the file size is larger than the actual size of my JAR file. Therefore, when I run my lambda function it fails as it cannot find the handler due to incorrect package deployed. I verified it by uploading manually the jar file to my Java lambda function and it worked.
Below is the code snippet of my yaml file:
---
service: api
provider:
name: aws
stackName: ${self:custom.prefix}-${opt:stage}-${self:service.name}
runtime: nodejs14.x
stage: ${opt:custom_stage, opt:stage}
tracing:
lambda: Active
timeout: 30
logRetentionInDays: 180
environment:
STAGE: ${opt:stage, opt:stage}
ENVIRONMENT: ${self:provider.stage}
SUPPRESS_NO_CONFIG_WARNING: true
ALLOW_CONFIG_MUTATIONS: true
functions:
sample-function-1:
role: arn:aws:iam::#{AWS::AccountId}:role/${self:custom.prefix}-${self:provider.stage}-sample-function-1
name: ${self:custom.prefix}-${opt:stage}-sample-function-1
handler: authorizers/handler.authHandler1
sample-function-2:
role: arn:aws:iam::#{AWS::AccountId}:role/${self:custom.prefix}-${self:provider.stage}-sample-function-2
name: ${self:custom.prefix}-${opt:stage}-sample-function-2
handler: authorizers/handler.authHandler1
myJavaFunction:
role: arn:aws:iam::#{AWS::AccountId}:role/${self:custom.prefix}-${self:provider.stage}-myJavaFunction-role
name: ${self:custom.prefix}-${opt:stage}-myJavaFunction
runtime: java11
package:
artifact: s3://myBucket/myJarFile.jar
handler: com.myFunction.LambdaFunctionHandler
memorySize: 512
timeout: 900
How can I deploy the correct package to my lambda function by fetching the jar file from S3 bucket?