jdk-24/hotspot/test/runtime/modules/ModuleStress/ModuleStress.java

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/*
 * @test
 * @bug 8159262
 * @summary Test differing scenarios where a module's readability list and a package's exportability list should be walked
 * @modules java.base/jdk.internal.misc
 * @library /testlibrary /test/lib
 * @compile ../AccessCheck/ModuleLibrary.java
 * @compile ModuleSameCLMain.java
 * @compile ModuleNonBuiltinCLMain.java
 * @compile CustomSystemClassLoader.java
 * @build ModuleStress
 * @run main/othervm ModuleStress
 */

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

public class ModuleStress {

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

        // Test #1: java -version
        //   All modules' readability lists and packages' exportability
        //   lists should contain only modules defined to the 3 builtin
        //   loaders (boot, application, platform).  Thus there is
        //   not a need to walk those lists at a GC safepoint since
        //   those loaders never die.
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
             "-Xbootclasspath/a:.",
             "-Xlog:modules=trace",
             "-version");

        OutputAnalyzer oa = new OutputAnalyzer(pb.start());
        oa.shouldNotContain("must be walked")
          .shouldNotContain("being walked")
          .shouldHaveExitValue(0);

        // Next 2 tests involve the use of class p1.c1 and p2.c2
        String source1 = "package p1;"   +
                         "import p2.c2;" +
                         "public class c1 {" +
                         "    public c1() {" +
                         "       p2.c2 c2_obj = new p2.c2();" +
                         "       c2_obj.method2();" +
                         "   }" +
                         "}";

        String source2 = "package p2;" +
                         "public class c2 {" +
                         "    public void method2() { }" +
                         "}";

        ClassFileInstaller.writeClassToDisk("p2/c2",
             InMemoryJavaCompiler.compile("p2.c2", source2),  System.getProperty("test.classes"));

        ClassFileInstaller.writeClassToDisk("p1/c1",
             InMemoryJavaCompiler.compile("p1.c1", source1), System.getProperty("test.classes"));

        // Test #2: Load two modules defined to the same customer class loader.
        //   m1's module readability list and package p2's exportability should
        //   not be walked at a GC safepoint since both modules are defined to
        //   the same loader and thus have the exact same life cycle.
        pb = ProcessTools.createJavaProcessBuilder(
             "-Xbootclasspath/a:.",
             "-Xlog:modules=trace",
             "ModuleSameCLMain");

        oa = new OutputAnalyzer(pb.start());
        oa.shouldNotContain("must be walked")
          .shouldNotContain("being walked")
          .shouldHaveExitValue(0);

        // Test #3: Load two modules in differing custom class loaders.
        //   m1's module readability list and package p2's exportability list must
        //   be walked at a GC safepoint since both modules are defined to non-builtin
        //   class loaders which could die and thus be unloaded.
        pb = ProcessTools.createJavaProcessBuilder(
             "-Xbootclasspath/a:.",
             "-Xlog:modules=trace",
             "ModuleNonBuiltinCLMain");

        oa = new OutputAnalyzer(pb.start());
        oa.shouldContain("module m1 reads list must be walked")
          .shouldContain("package p2 defined in module m2, exports list must be walked")
          .shouldNotContain("module m2 reads list must be walked")
          .shouldHaveExitValue(0);

        // Test #4: Load two modules in differing custom class loaders,
        //   of which one has been designated as the custom system class loader
        //   via -Djava.system.class.loader=CustomSystemClassLoader. Since
        //   m3 is defined to the system class loader, m2's module readability
        //   list does not have to be walked at a GC safepoint, but package p2's
        //   exportability list does.
        pb = ProcessTools.createJavaProcessBuilder(
             "-Djava.system.class.loader=CustomSystemClassLoader",
             "-Xbootclasspath/a:.",
             "-Xlog:modules=trace",
             "ModuleNonBuiltinCLMain");

        oa = new OutputAnalyzer(pb.start());
        oa.shouldContain("package p2 defined in module m2, exports list must be walked")
          .shouldNotContain("module m2 reads list must be walked")
          .shouldHaveExitValue(0);

    }
}