RFR: 8361255: CTW: Tolerate more NCDFE problems [v3]

[Aleksey Shipilev]

On Thu, 3 Jul 2025 22:51:02 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Just use printf directly
>
> test/hotspot/jtreg/testlibrary/ctw/src/sun/hotspot/tools/ctw/Compiler.java line 89:
> 
>> 87:             UNSAFE.ensureClassInitialized(aClass);
>> 88:         } catch (NoClassDefFoundError e) {
>> 89:             CompileTheWorld.OUT.printf("[%d]\t%s\tNOTE unable to init class : %s%n",
> 
> Do you mean `\n` here and in all other outputs? `%n` needs local variable to store size of output.

I meant `%n` :)

You are probably thinking about C printf? In Java [formatters](https://docs.oracle.com/javase/8/docs/api/java/util/Formatter.html), `%n` is the "platform-specific line separator". It is more compatible than just `\n`, which runs into platform-specific `CR` vs `LF` vs `CRLF` line separator mess.

See:


jshell> System.out.printf("Hello\nthere,\nVladimir!\n")
Hello
there,
Vladimir!
$6 ==> java.io.PrintStream at 34c45dca

jshell> System.out.printf("Hello%nthere,%nVladimir!%n")
Hello
there,
Vladimir!
$7 ==> java.io.PrintStream at 34c45dca

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/26090#discussion_r2184484564