jdk-24/hotspot/test/runtime/modules/Xpatch/XpatchTraceCL.java

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/*
 * @test
 * @bug 8069469
 * @summary Make sure -XX:+TraceClassLoading works properly with "modules" jimage,
            -Xpatch, and with -Xbootclasspath/a
 * @library /testlibrary
 * @compile XpatchMain.java
 * @run main XpatchTraceCL
 */

import java.io.File;
import jdk.test.lib.*;

public class XpatchTraceCL {

    public static void main(String[] args) throws Exception {
        String source = "package javax.naming.spi; "                +
                        "public class NamingManager { "             +
                        "    static { "                             +
                        "        System.out.println(\"I pass!\"); " +
                        "    } "                                    +
                        "}";

        // Test -XX:+TraceClassLoading output for -Xpatch
        ClassFileInstaller.writeClassToDisk("javax/naming/spi/NamingManager",
             InMemoryJavaCompiler.compile("javax.naming.spi.NamingManager", source, "-Xmodule:java.naming"),
             "mods/java.naming");

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xpatch:mods",
             "-XX:+TraceClassLoading", "XpatchMain", "javax.naming.spi.NamingManager");

        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        // "modules" jimage case.
        output.shouldContain("[classload] java.lang.Thread source: jrt:/java.base");
        // -Xpatch case.
        output.shouldContain("[classload] javax.naming.spi.NamingManager source: mods" +
            File.separator + "java.naming");
        // -cp case.
        output.shouldContain("[classload] XpatchMain source: file");

        // Test -XX:+TraceClassLoading output for -Xbootclasspath/a
        source = "package XpatchTraceCL_pkg; "                 +
                 "public class ItIsI { "                          +
                 "    static { "                                  +
                 "        System.out.println(\"I also pass!\"); " +
                 "    } "                                         +
                 "}";

        ClassFileInstaller.writeClassToDisk("XpatchTraceCL_pkg/ItIsI",
             InMemoryJavaCompiler.compile("XpatchTraceCL_pkg.ItIsI", source),
             "xbcp");

        pb = ProcessTools.createJavaProcessBuilder("-Xbootclasspath/a:xbcp",
             "-XX:+TraceClassLoading", "XpatchMain", "XpatchTraceCL_pkg.ItIsI");
        output = new OutputAnalyzer(pb.start());
        // -Xbootclasspath/a case.
        output.shouldContain("[classload] XpatchTraceCL_pkg.ItIsI source: xbcp");
        output.shouldHaveExitValue(0);
    }
}