Provide GraalVM native image support

[sdeleuze]

We don't provide such support directly on Spring Native side because we only support what supported on start.spring.io, but I will be happy to provide some guidance and help if somebody is interested to contribute it here.

[bnasslahsen]

Hi @sdeleuze,

I confirm WIP to have GraalVM fully supported together with spring-native.

It should be working, out of the box without any additional configuration starting from the next release v1.5.9!

The main missing piece is related to oracle/graal#1108 or spring-attic/spring-native#157, but i added workaround for it 60e458e.

I will add a simple demos project that will be available soon using the latest SNAPSHOT.

[sdeleuze]

Amazing, I will mention Springdoc in Spring Native documentation when released.

[bnasslahsen]

Hi @sdeleuze,

I confirm, that release springdoc-openapi v1.5.9 is now released.

There is huge improvement of load time during the first and second access to the swagger-ui.

The improvement is just impressive with the native image on many levels.
The springdoc demos applications, has been built using paketobuildpacks/builder:tiny, with the default configuration (no optimization).

VM characteristics:

Component	characteristics
CPU(Intel)	2 OCPU
Memory	8 GB

Components versions:

Component	Version
spring-boot	2.5.0
spring-native	0.9.2

springdoc-openapi-spring-boot-2-webflux demo results:

Native Image	JVM	Startup time (sec)	swagger-ui Tweets-API 1st run (ms)	swagger-ui Stream-API 2nd run (ms)	Image Size (MB)	Memory Usage (MB)	CPU Usage (%)
No	Hotspot 1.8.0_292	2.603	183	19	240	527	4
Yes	GraalVM 21.0.0.2	0.084	8	3	224	132	0.8

springdoc-openapi-spring-boot-2-webmvc demo results:

Native Image	JVM	Startup time (sec)	swagger-ui Users-API 1st run (ms)	swagger-ui Stores-API 2nd run (ms)	Image Size (MB)	Memory Usage (MB)	CPU Usage (%)
No	Hotspot 1.8.0_292	2.569	416	39	238	481	5
Yes	GraalVM 21.0.0.2	0.13	38	9	214	126	0.7

[goafabric]

@bnasslahsen
Thanks for your support .. i barely missed this post .. and up to know i did not know that there are two OpenApi Implementations for Spring (Springfox is the one I knew)

I tried version 1.5.9 with the latest Spring Native 0.10.1 ... unfortunately its not working out of the box.
The code Compiles and i can access the OpenAPI page .. but it than throws one of those dreaded
NativeHint Exceptions ...
Indication missing Nativehints on RestController and SynthesizedAnntation .. even setting this does not resolve the issue.

Is there anything special that has to be adjusted here ? The Demo Example e.g. excludes the health endpoint

thx

[bnasslahsen]

@goafabric,

As mentioned in the previous post, the demo was validated with:

Component	Version
spring-boot	2.5.0
spring-native	0.9.2

For the support for newer versions which, it's better to create a separate enhancement request. (I have now created #1225)