jdk-24/test/hotspot/jtreg/runtime/modules/ModuleOptionsTest.java

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/*
 * @test
 * @bug 8136930
 * @summary Test that the VM only recognizes the last specified --list-modules
 *          options but accumulates --add-module values.
 * @requires vm.flagless
 * @modules java.base/jdk.internal.misc
 * @library /test/lib
 * @run driver ModuleOptionsTest
 */

import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;

// Test that the VM behaves correctly when processing module related options.
public class ModuleOptionsTest {

    public static void main(String[] args) throws Exception {

        // Test that multiple --add-modules options are cumulative, not last one wins.
        // An exception should be thrown because module i_dont_exist doesn't exist.
        ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder(
            "--add-modules=i_dont_exist", "--add-modules=java.base", "-version");
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldContain("FindException");
        output.shouldContain("i_dont_exist");
        output.shouldHaveExitValue(1);

        // Test that the last --limit-modules is the only one recognized.  No exception
        // should be thrown.
        pb = ProcessTools.createLimitedTestJavaProcessBuilder(
            "--limit-modules=i_dont_exist", "--limit-modules=java.base", "-version");
        output = new OutputAnalyzer(pb.start());
        output.shouldHaveExitValue(0);
    }
}