On Thu, 10 Oct 2024 17:54:51 GMT, Jan Lahoda <jlah...@openjdk.org> wrote:
>> Currently, running `java` without any parameters will lead to an output that >> is a full `--help`, which is over 100 lines (on my computer at least), and >> it feels overwhelming. And many people might actually want to run >> JShell/REPL, not the `java` launcher, but it is difficult find out about >> JShell. >> >> The proposal herein is to print a much shorter help, together with a pointer >> to JShell, when the launcher does not know what to do. I.e. there is nothing >> specified to start, and no option like `--help` is specified. In particular, >> on my machine, it prints: >> >> $ java >> openjdk 24-internal 2025-03-18 >> >> Usage: java [options...] <what to execute> [arguments to main method...] >> >> Where <what to execute> is one of: >> <MainClass> to execute the main method of a compiled class >> -jar <jar-file.jar> to execute the main class in a JAR archive >> -m <module>[/<MainClass>] to execute the main class of a module >> <SourceFile.java> to compile and execute a single-file program >> >> Where key options include: >> --class-path <class path> >> a : separated list of directories and JAR archives to search for class >> files >> --module-path <module path> >> a : separated list of directories and JAR archives to search for >> modules >> >> For more details about this launcher: java --help >> For an interactive Java environment: jshell >> >> >> Hopefully, this may be easier both for people trying to run something, and >> for people that are really looking for JShell. >> >> What do you think? >> >> Thanks! > > Jan Lahoda has updated the pull request incrementally with one additional > commit since the last revision: > > Adjusting the concise help based on review suggestions. src/java.base/share/classes/sun/launcher/resources/launcher.properties line 241: > 239: \ -jar <jar-file.jar> to execute the main class in a JAR > archive\n\ > 240: \ -m <module>[/<MainClass>] to execute the main class of a module\n\ > 241: \ <SourceFile.java> to compile and execute a single-file > program\n\n\ Suggestion: \ <SourceFile>.java to compile and execute a single-file program\n\n\ ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/21411#discussion_r1802210431
