Using CDS and AOT with the Eclipse IDE

[Daniel Schmid]

Hi there,

I made a few experiments with CDS and AOT archives on the Eclipse IDE 
and wanted to share my results here.
I ran 4 Eclipse installations (my personal main Eclipse installation is 
in a comment further down) with AppCDS and -XX:AOTCache and I have 
written down my results here: 
https://github.com/eclipse-platform/eclipse.platform/discussions/2060

I think the Eclipse IDE is an interesting application to test as it is a 
fairly big codebase with many classes loaded at runtime (so it doesn't 
make it easy for Leyden's improvements) via OSGi.

I have used the latest EA build of JDK 26 (26-ea+6-582). Should I use a 
different JDK build to test it?

Essentially my findings (which are relevant to this mailing list) are 
the following:
- There has been an error when creating the AOT archive but it was still 
created and it was usable. I want to make sure that the people here are 
aware of that error. To be honest, I did not expect -XX:AOTCache to work 
that well with Eclipse.
- While CDS seems to come with a noticeable improvement for Eclipse 
startup time, -XX:AOTCache seems to have similar startup times as CDS 
(not faster). This might be because of Eclipse's class loading shenanigans.
- It worked with an agent attached (The Lombok tooling for Eclipse 
attaches an agent into the IDE, I think that's necessary to inject 
itself into the Eclipse Java Compiler).


The error I got:

|[0.074s][error][aot] An error has occurred while processing the AOT 
configuration file. Run with -Xlog:aot for details. [0.074s][error][aot] 
archivedBootLayer not available, disabling full module graph AOTCache 
creation is complete: app.aot 106397696 bytes |

I provided the logs here: 
https://github.com/user-attachments/files/21313886/AOT_logs_26ea.txt 
(technically not the same run but it also has that error).


Yours,
Daniel Schmid
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