Hey community! I am creating a Gradle that has a task that start a Java tool in an external JVM process. For that my tasks extends the JavaExec class provided by Gradle. Everything works as intended but I have some issue with log output: When I start the build with default logging level (lifecycle), the whole output from my external JVM process is shown. How can I control that? I want that output to be hidden unless the log level is at least INFO. Thanks!

Use ExecOperations to control the execution/output

logging.captureStandardOutput(<http://LogLevel.INFO|LogLevel.INFO>)

on the task

captureStandardOutput

does not look like a relevant solution:

Why not?

why not? It routes the output to the logger at the QUIET level.

It exactly answers the question you stated

My task has no field

logging

yes it has

@Override
    public org.gradle.api.logging.LoggingManager getLogging() {
        return super.getLogging();
    }

on DefaultTask.

This is my current solution (I am not satisfied that I have to redirect the stdout by myself):

@TaskAction
public void execute() {
    var bufferOut = new ByteArrayOutputStream();

    var result = execOperations.javaexec(spec -> {
        spec.setClasspath(runtimeConfiguration);
        spec.getMainClass().set("jooqgenie.tool.JooqGenieTool");
        //...
        spec.setIgnoreExitValue(true);
        spec.setStandardOutput(bufferOut);

    });

    if (getLogger().isInfoEnabled()) {
        getLogger().info(bufferOut.toString());
    }

    if (result.getExitValue() != 0) {
        throw new GradleException("JooqGenieTool execution failed with exit code: " + result.getExitValue());
    }
}

Then just do what I told you 🙂

image.png

logging, not logger

ups, let me try

Hm, interesting. I have a task where I call an Xslt processor in-process, there it works fine. Maybe the

javaexec

already captures stdout and sends it to the logging making the option not work.

It is on stdout because my previous solution did work.

No it's not on stdout or the option would have helped. It is on whatever stream was set to the stdout field there. Maybe if you set the actual System.out to that field? 🤷‍♂️

getLogging().captureStandardOutput(<http://LogLevel.INFO|LogLevel.INFO>);
        System.out.println("####"); // !!!!!!!!!!

        execOperations.javaexec(spec -> {
            spec.setClasspath(runtimeConfiguration);
            spec.getMainClass().set("jooqgenie.tool.JooqGenieTool");
            spec.setStandardOutput(System.out); // !!!!!!!!!!!!
        });

It swallows only "####" but the child process output is still visible.