How can I see where the sjavac_server is started?

[Erik Joelsson]

Hello Andrew,

On 2019-02-26 12:09, Andrew Haley wrote:
> I'm seeing a crash in the javac server while building openjdk.
We are seeing this too intermittently.
> I want to run the exact same command that started the server running,
> but even with LOG=debug I cannot find the command line that starts
> it. The command seems not to be there at all.
>
> So, how exactly does the javac server get started, and how do I find
> the command line that started it?
The server is started lazily by the first javac invocation that needs 
it. There is a parameter given to javac that describes how it should be 
started, but to get the exact command line, you would have to instrument 
javac java source. You should be able to add additional parameters to 
that JVM, at least by editing spec.gmk, that could help you with 
diagnostics.
> And, incidentally, given that I'f configured with --disable-sjavac,
> why is the build running a javac server? Thanks.
>
The "smart javac" and the javac server are not one the same. The server 
was introduced in sjavac, but the server part was later ported over to 
javac proper (I think). So now we have two configure arguments, 
--enable-sjavac and --disable-javac-server. The latter is what you are 
looking for.

I think we should really get rid of sjavac since the relevant benefits 
are already present in the default build, with the javac server and the 
dependency plugin. The only possible benefit of sjavac today would be 
more fine grained incremental build support, but I doubt it works very 
well given that it's not being maintained.

/Erik