upload file size limit in spring boot

In version 2.1.0, spring.servlet.multipart.max-file-size property failed to bind org.springframework.util.unit.DataSize.

Property : spring.servlet.multipart.maxFileSize= 50Mb 

Exception

Description: Failed to bind properties under 'spring.servlet.multipart.max-file-size' to org.springframework.util.unit.DataSize: Property: spring.servlet.multipart.maxfilesize Value: 50Mb Origin: "spring.servlet.multipart.maxFileSize" from property source "bootstrapProperties" Reason: failed to convert java.lang.String to @org.springframework.boot.convert.DataSizeUnit org.springframework.util.unit.DataSize Action: Update your application's configuration 

4 Answers

As Michael & Stahorszki mentioned

"B"

must be capital

Property : spring.servlet.multipart.maxFileSize= 50MB 

In Yaml

spring: servlet: multipart: max-file-size: ${MAX_FILE_SIZE:8MB} max-request-size: ${MAX_REQUEST_SIZE:8MB} 

Today I have repeated this error, althought I set "MB" with capital "B":

Description: Failed to bind properties under 'spring.servlet.multipart.max-file-size' to org.springframework.util.unit.DataSize: Property: spring.servlet.multipart.max-file-size Value: 300MB Origin: class path resource [application.properties]:27:40 Reason: failed to convert java.lang.String to org.springframework.util.unit.DataSize 

If I comment out this options application wouldn't start anyway - there are some errors in the spring context. So I think it is a wrong error message then context cannot be created + multipart options are given.

In my case, I had redundant whitespace at the end of size (after MB, KB). To fix this, I deleted the space.

Remove the space as well after 50MB, I faced the same error but due to space after value attribute