How to handle errors

[ski n]

Hi Leyden devs,

I used CDS before with my Spring Boot application. I recently started to
test Leyden with the recent released JDK24.01 (both GraalVM and Temurin).
Likewise, I first want to test this
on my local laptop (Windows 11/intel i7), and try to implement this in my
CI/CD to create the cache with a training run, probably with JDK25.

I run the following commands:

D:\test\graalvm-jdk-24.0.1+9.1\bin\java -XX:AOTMode=record
-XX:AOTConfiguration=app.aotconf -jar gateway-5.1.0.jar
D:\test\graalvm-jdk-24.0.1+9.1\bin\java -XX:AOTMode=create
-XX:AOTConfiguration=app.aotconf -XX:AOTCache=app.aot -jar gateway-5.1.0.jar
D:\test\graalvm-jdk-24.0.1+9.1\bin\java -XX:AOTCache=app.aot -jar
gateway-5.1.0.jar

However, on the second command, I get these warnings/errors:

D:\test\jdk-24.0.1+9\bin\java -XX:AOTMode=create
-XX:AOTConfiguration=app.aotconf -XX:AOTCache=app.aot -jar gateway-5.1.0.jar
[0.657s][warning][cds] Skipping jdk/internal/event/Event: JFR event class
[1.147s][warning][cds,heap] Archive heap points to a static field that may
hold a different value at runtime:
[1.148s][warning][cds,heap] Field:
java/lang/invoke/MethodHandleImpl$BindCaller::CD_Object_array
[1.150s][warning][cds,heap] Value: jdk.internal.constant.ArrayClassDescImpl
[1.150s][warning][cds,heap] {0x0000000605959028} - klass:
'jdk/internal/constant/ArrayClassDescImpl' - flags:
[1.150s][warning][cds,heap]
[1.151s][warning][cds,heap]  - ---- fields (total size 3 words):
[1.151s][warning][cds,heap]  - private final 'rank' 'I' @12  1 (0x00000001)
[1.152s][warning][cds,heap]  - private final 'elementType'
'Ljava/lang/constant/ClassDesc;' @16  a
'jdk/internal/constant/ClassOrInterfaceDescImpl'{0x0000000605914380}
(0xc0b22870)
[1.152s][warning][cds,heap]  - private 'cachedDescriptorString'
'Ljava/lang/String;' @20  "[Ljava/lang/Object;"{0x0000000605959040}
(0xc0b2b208)
[1.152s][warning][cds,heap] --- trace begin ---
[1.153s][warning][cds,heap] [ 0] {0x0000000605b73798} java.lang.Class
(jdk.internal.constant.ConstantUtils::CD_Object_array)
[1.153s][warning][cds,heap] [ 1] {0x0000000605959028}
jdk.internal.constant.ArrayClassDescImpl
[1.153s][warning][cds,heap] --- trace end ---
[1.153s][warning][cds,heap]
[1.154s][error  ][cds,heap] Scanned 65968 objects. Found 1 case(s) where an
object points to a static field that may hold a different value at runtime.
[1.154s][error  ][cds     ] An error has occurred while writing the shared
archive file.

I'm not really sure if this error means I cannot use the cache, but I
manually removed the java/lang/invoke/MethodHandleImpl$BindCaller from the
AOTCache. After that, I can create the cache and start my application.

I still got this error and warning:

[0.026s][error][cds] CDS archive has aot-linked classes. It cannot be used
when archived full module graph is not used.
[0.017s][warning][cds] shared class paths mismatch (hint: enable
-Xlog:class+path=info to diagnose the failure)

It seems like the cache isn't properly applied, and I don't see a lot of
startup time improvement (Is there a way to properly measure the difference
between a normal run, and cached run?) I did measure it with timing, and
find that cached run seems to be around 2 seconds fastes (from 8 seconds
startup to 6 seconds startup). The test jar that I used can be downloaded
from GitHub:

https://github.com/assimbly/gateway/releases/tag/5.1.0Beta

I am creating the AOTCache properly? And how to mitigate such
warnings/errors?

Raymond
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