/*
* Copyright ( c ) 2022 , Oracle and / or its affiliates . All rights reserved .
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER .
*
* This code is free software ; you can redistribute it and / or modify it
* under the terms of the GNU General Public License version 2 only , as
* published by the Free Software Foundation .
*
* This code is distributed in the hope that it will be useful , but WITHOUT
* ANY WARRANTY ; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE . See the GNU General Public License
* version 2 for more details ( a copy is included in the LICENSE file that
* accompanied this code ) .
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work ; if not , write to the Free Software Foundation ,
* Inc . , 51 Franklin St , Fifth Floor , Boston , MA 02110 - 1301 USA .
*
* Please contact Oracle , 500 Oracle Parkway , Redwood Shores , CA 94065 USA
* or visit www . oracle . com if you need additional information or have any
* questions .
*/
package jdk.jfr.jvm;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.spi.ToolProvider;
import jdk.test.lib.JDKToolFinder;
import jdk.test.lib.Platform;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;
/**
* @ test
* @ key jfr
* @ summary Checks that a JDK image with and without the jdk . jfr module behaves
* as expected
* @ requires vm . hasJFR
* @ library / test / lib
* @ run driver jdk . jfr . jvm . TestModularImage
*/
public class TestModularImage {
private static final String STARTED_RECORDING = "Started recording" ;
private static final String HELLO_WORLD = "hello, world" ;
private static final String ERROR_LINE1 = "Error occurred during initialization of boot layer" ;
private static final String ERROR_LINE2 = "java.lang.module.FindException: Module jdk.jfr not found" ;
private static final ToolProvider javac = find("javac" );
private static final ToolProvider jlink = find("jlink" );
private static final Path out = Path.of("out" );
private static final Path src = out.resolve("src" );
private static final Path classes = out.resolve("classes" );
private static final Path testJDK = Path.of(System.getProperty("test.jdk" ));
private static final Path jmods = testJDK.resolve("jmods" );
private static final String modulePath = jmods.toString() + File.pathSeparator + classes.toString();
public static void main(String[] args) throws Exception {
preparseSourceTree();
compileSourceCode();
// Jcmd for the current JVM where jdk.attach module is available
String currentJcmd = JDKToolFinder.getJDKTool("jcmd" );
currentJcmd = Path.of(currentJcmd).normalize().toAbsolutePath().toString();
// Image 1: Should be able to start JFR if jdk.jfr module is present
Path javaBin1 = jlink("hello.world,jdk.jfr" , "with-jfr" );
testCommandLineWithJFR(javaBin1);
testJcmdWithJFR(javaBin1, currentJcmd);
// Image 2: Should fail if jdk.jfr module is not present
Path javaBin2 = jlink("hello.world" , "without-jfr" );
testCommandLineWithoutJFR(javaBin2);
testJcmdWithoutJFR(javaBin2, currentJcmd);
}
private static void testCommandLineWithJFR(Path binPath) throws Exception {
var result = java(binPath, "-XX:StartFlightRecording" , "--module" , "hello.world/hello.Main" );
result.shouldNotContain(ERROR_LINE1);
result.shouldNotContain(ERROR_LINE2);
result.shouldContain(HELLO_WORLD);
result.shouldContain(STARTED_RECORDING);
result.shouldHaveExitValue(0 );
}
private static void testJcmdWithJFR(Path binPath, String jcmd) throws Exception {
var result = java(binPath, "--module" , "hello.world/hello.Main" , jcmd);
result.shouldContain(HELLO_WORLD);
result.shouldNotContain(ERROR_LINE1);
result.shouldNotContain(ERROR_LINE2);
result.shouldContain(STARTED_RECORDING);
result.shouldHaveExitValue(0 );
}
private static void testCommandLineWithoutJFR(Path binPath) throws Exception {
var result = java(binPath, "-XX:StartFlightRecording" , "--module" , "hello.world/hello.Main" );
result.shouldContain(ERROR_LINE1);
result.shouldContain(ERROR_LINE2);
result.shouldNotContain(HELLO_WORLD);
result.shouldNotContain(STARTED_RECORDING);
result.shouldHaveExitValue(1 );
}
private static void testJcmdWithoutJFR(Path binPath, String jcmd) throws Exception {
OutputAnalyzer result = java(binPath, "--module" , "hello.world/hello.Main" , jcmd);
result.shouldContain(HELLO_WORLD);
result.shouldContain("Module jdk.jfr not found." );
result.shouldContain("Flight Recorder can not be enabled." );
result.shouldNotContain(STARTED_RECORDING);
result.shouldHaveExitValue(0 );
}
private static ToolProvider find(String tool) {
return ToolProvider.findFirst(tool).orElseThrow(() -> new RuntimeException("No " + tool));
}
private static void preparseSourceTree() throws IOException {
String main =
"" "
package hello;
import java.io.ByteArrayOutputStream;
public class Main {
public static void main(String... args) throws Exception {
System.out.println("hello, world!" );
if (args.length > 0 ) {
long pid = ProcessHandle.current().pid();
String jcmd = args[0 ];
String[] cmds = { jcmd, Long .toString(pid), "JFR.start" };
Process process = new ProcessBuilder(cmds).redirectErrorStream(true ).start();
process.waitFor();
var baos = new ByteArrayOutputStream();
process.getInputStream().transferTo(baos);
System.out.println(baos.toString());
System.exit(process.exitValue());
}
}
}
"" ";
String moduleInfo = "module hello.world {}" ;
Path helloWorld = src.resolve("hello.world" );
Files.createDirectories(helloWorld.resolve("hello" ));
Files.write(helloWorld.resolve("module-info.java" ), moduleInfo.getBytes());
Files.write(helloWorld.resolve("hello" ).resolve("Main.java" ), main.getBytes());
}
private static void compileSourceCode() {
javac.run(System.out, System.err,
"--module-source-path" , src.toString(),
"--module" , "hello.world" ,
"-d" , classes.toString());
}
private static Path jlink(String modules, String output) {
jlink.run(System.out, System.err,
"--add-modules" , modules,
"--module-path" , modulePath,
"--output" , output);
return Path.of(output).resolve("bin" ).toAbsolutePath();
}
private static OutputAnalyzer java(Path jvm, String... args) throws Exception {
ProcessBuilder pb = new ProcessBuilder();
String java = Platform.isWindows() ? "java.exe" : "java" ;
List<String> arguments = new ArrayList<>();
arguments.add(jvm.resolve(java).toString());
arguments.addAll(Arrays.asList(args));
pb.command(arguments);
pb.directory(jvm.toFile());
System.out.println("Executing: java " + String.join(" " , args));
OutputAnalyzer result = ProcessTools.executeProcess(pb);
System.out.println("--- Output ----" + "-" .repeat(65 ));
System.out.println(result.getOutput());
System.out.println("-" .repeat(80 ));
return result;
}
}
Messung V0.5 in Prozent C=98 H=86 G=91
¤ Dauer der Verarbeitung: 0.11 Sekunden
(vorverarbeitet am 2026-06-10)
¤
*© Formatika GbR, Deutschland