hotspot/test/runtime/modules/PatchModule/PatchModuleTestJar.java

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/*
 * @test
 * @summary Make sure --patch-module works when a jar file is specified for a module
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          jdk.jartool/sun.tools.jar
 * @compile PatchModuleMain.java
 * @run main PatchModuleTestJar
 */

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

public class PatchModuleTestJar {
    private static String moduleJar;

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

        // Create a class file in the module java.naming. This class file
        // will be put in the javanaming.jar file.
        String source = "package javax.naming.spi; "                +
                        "public class NamingManager { "             +
                        "    static { "                             +
                        "        System.out.println(\"I pass!\"); " +
                        "    } "                                    +
                        "}";

        ClassFileInstaller.writeClassToDisk("javax/naming/spi/NamingManager",
             InMemoryJavaCompiler.compile("javax.naming.spi.NamingManager", source, "-Xmodule:java.naming"),
             System.getProperty("test.classes"));

        // Build the jar file that will be used for the module "java.naming".
        BasicJarBuilder.build("javanaming", "javax/naming/spi/NamingManager");
        moduleJar = BasicJarBuilder.getTestJar("javanaming.jar");

        // Just to make sure we are not fooled by the class file being on the
        // class path where all the test classes are stored, write the NamingManager.class
        // file out again with output that does not contain what OutputAnalyzer
        // expects. This will provide confidence that the contents of the class
        // is truly coming from the jar file and not the class file.
        source =        "package javax.naming.spi; "                +
                        "public class NamingManager { "             +
                        "    static { "                             +
                        "        System.out.println(\"Fail!\"); "   +
                        "    } "                                    +
                        "}";

        ClassFileInstaller.writeClassToDisk("javax/naming/spi/NamingManager",
             InMemoryJavaCompiler.compile("javax.naming.spi.NamingManager", source, "-Xmodule:java.naming"),
             System.getProperty("test.classes"));

        // Supply --patch-module with the name of the jar file for the module java.naming.
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("--patch-module=java.naming=" + moduleJar,
             "PatchModuleMain", "javax.naming.spi.NamingManager");

        new OutputAnalyzer(pb.start())
            .shouldContain("I pass!")
            .shouldHaveExitValue(0);
    }
}