How to use executeJCmd method of sun.tools.attach.HotSpotVirtualMachine class

Best Powermock code snippet using sun.tools.attach.HotSpotVirtualMachine.executeJCmd

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...145 drain(vm, in);146 }147 private static void flags(String pid) throws IOException {148 HotSpotVirtualMachine vm = (HotSpotVirtualMachine) attach(pid);149 InputStream in = vm.executeJCmd("VM.flags");150 System.out.println("VM Flags:");151 drain(vm, in);152 }153 private static void commandLine(String pid) throws IOException {154 HotSpotVirtualMachine vm = (HotSpotVirtualMachine) attach(pid);155 InputStream in = vm.executeJCmd("VM.command_line");156 drain(vm, in);157 }158 private static void sysprops(String pid) throws IOException {159 HotSpotVirtualMachine vm = (HotSpotVirtualMachine) attach(pid);160 InputStream in = vm.executeJCmd("VM.system_properties");161 System.out.println("Java System Properties:");162 drain(vm, in);163 }164 /​/​ Attach to <pid>, exiting if we fail to attach165 private static VirtualMachine attach(String pid) {166 try {167 return VirtualMachine.attach(pid);168 } catch (Exception x) {169 String msg = x.getMessage();170 if (msg != null) {171 System.err.println(pid + ": " + msg);172 } else {173 x.printStackTrace();174 }...

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executeJCmd

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1import java.io.File;2import java.io.IOException;3import java.lang.reflect.InvocationTargetException;4import java.lang.reflect.Method;5import java.util.Arrays;6import java.util.List;7import com.sun.tools.attach.VirtualMachine;8import com.sun.tools.attach.VirtualMachineDescriptor;9public class JCmd {10 public static void main(String[] args) throws IOException, NoSuchMethodException, SecurityException,11 IllegalAccessException, IllegalArgumentException, InvocationTargetException {12 if (args.length < 2) {13 System.out.println("Usage: JCmd <pid> <command> [args]");14 return;15 }16 int pid = Integer.parseInt(args[0]);17 String command = args[1];18 List<String> arguments = Arrays.asList(args).subList(2, args.length);19 VirtualMachine vm = null;20 for (VirtualMachineDescriptor vmd : VirtualMachine.list()) {21 if (vmd.id().equals(String.valueOf(pid))) {22 vm = VirtualMachine.attach(vmd);23 break;24 }25 }26 if (vm == null) {27 System.out.println("Process " + pid + " not found");28 return;29 }30 File toolsJar = new File(System.getProperty("java.home") + File.separator + "lib" + File.separator + "tools.jar");31 if (!toolsJar.exists()) {32 System.out.println("tools.jar not found");33 return;34 }35 vm.loadAgent(toolsJar.getAbsolutePath());36 Class<?> vmClass = Class.forName("sun.tools.attach.HotSpotVirtualMachine");37 Method executeJCmdMethod = vmClass.getDeclaredMethod("executeJCmd", String.class, String[].class);38 Object result = executeJCmdMethod.invoke(vm, command, arguments.toArray(new String[arguments.size()]));39 System.out.println(result);40 }41}42$ java -cp .;tools.jar JCmd 1234 VM.version

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executeJCmd

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1import sun.tools.attach.HotSpotVirtualMachine;2import java.io.IOException;3import java.io.InputStream;4import java.io.InputStreamReader;5import java.io.BufferedReader;6import java.util.List;7import java.util.ArrayList;8import java.util.Arrays;9import java.util.regex.Pattern;10import java.util.regex.Matcher;11public class ExecuteJCmd {12public static void main(String[] args) throws Exception {13String pid = null;14if (args.length > 0) {15pid = args[0];16} else {17pid = getPid();18}19HotSpotVirtualMachine vm = new HotSpotVirtualMachine(pid);20try {21vm.executeJCmd("GC.class_histogram", new String[] {"java.lang.String"});22} finally {23vm.detach();24}25}26private static String getPid() throws Exception {27String name = ExecuteJCmd.class.getName();28String pid = null;29Process process = Runtime.getRuntime().exec("jps");30try {31process.waitFor();32BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));33String line = null;34while ((line = reader.readLine()) != null) {35if (line.indexOf(name) >= 0) {

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executeJCmd

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1import java.io.IOException;2import java.lang.reflect.InvocationTargetException;3import java.lang.reflect.Method;4import java.util.Arrays;5import java.util.List;6import java.util.stream.Collectors;7public class ExecuteJCmd {8 public static void main(String[] args) throws IOException, ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException {9 String pid = args[0];10 String command = args[1];11 String[] arguments = Arrays.copyOfRange(args, 2, args.length);12 Class<?> clazz = Class.forName("sun.tools.attach.HotSpotVirtualMachine");13 Method method = clazz.getDeclaredMethod("executeJCmd", String.class, String[].class);14 method.setAccessible(true);15 String result = (String) method.invoke(null, pid, new Object[]{arguments});16 System.out.println(result);17 }18}19- Java Heap (reserved=10737418240, committed=10737418240)20 (mmap: reserved=10737418240, committed=10737418240)21- Class (reserved=268435456, committed=268435456)22 (classes #=17827)23 ( ordinary #=17781)24 ( mirror #=46)25 (mmap: reserved=268435456, committed=268435456)26- Thread (reserved=23068672, committed=23068672)27 (thread #=20)28 (stack: reserved=23068672, committed=23068672)29 ( #bytes used=22934448)30- Code (reserved=251658240, committed=251658240)31 (malloc=251658240 #=1)32- GC (reserved=268435456, committed=268435456)33 (malloc=268435456 #=1)34- Compiler (reserved=16777216, committed=16777216)35 (malloc=16777216 #=1)36- Internal (reserved=268435456, committed=268435456)37 (malloc=268435456 #=1)38- Symbol (reserved=5242880, committed=5242880)39 (

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executeJCmd

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1import java.io.*;2import java.lang.management.*;3import java.util.*;4import java.util.concurrent.*;5import java.util.concurrent.atomic.*;6import java.util.concurrent.locks.*;7import java.util.function.*;8import java.util.stream.*;9import java.util.stream.Collectors.*;10import java.util.stream.StreamSupport.*;11import java.util.regex.*;12import java.util.regex.Pattern.*;13import java.util.regex.Matcher.*;14import java.util.regex.PatternSyntaxException.*;15import java.util.regex.MatchResult.*;16import java.util.regex.MatchResult.*;17import java.nio.*;18import java.nio.file.*;19import java.nio.file.attribute.*;20import java.nio.file.attribute.BasicFileAttributes.*;21import java.nio.file.attribute.FileTime.*;22import java.nio.file.attribute.PosixFilePermission.*;23import java.nio.file.attribute.PosixFilePermissions.*;24import java.nio.fil

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executeJCmd

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1import sun.tools.attach.HotSpotVirtualMachine2import java.util.regex.Pattern3import java.util.regex.Matcher4import java.util.Properties5def vm = HotSpotVirtualMachine.attach(pid)6def props = vm.getSystemProperties()7def javaVersion = props.getProperty("java.version")8def javaHome = props.getProperty("java.home")9def jstackVersion = execute(jstackCommand, "-V")10def jstackVersionMatcher = Pattern.compile("jstack version (\\S+)").matcher(jstackVersion)11if (jstackVersionMatcher.find()) {12 jstackVersion = jstackVersionMatcher.group(1)13}14def jstackOutput = execute(jstackCommand, pid)15def jstackOutputMatcher = Pattern.compile("Full thread dump (Java HotSpot\\(TM\\) (\\S+)\\(\\S+\\) \\S+ \\S+ \\S+)").matcher(jstackOutput)16if (jstackOutputMatcher.find()) {17 jstackOutput = jstackOutputMatcher.group(1)18}19def jstackCmdLineMatcher = Pattern.compile("Command line: (.*)").matcher(jstackOutput)20if (jstackCmdLineMatcher.find()) {21 jstackCommandLine = jstackCmdLineMatcher.group(1)22}23def jstackOutputHeader = jstackOutputMatcher.group(1)24def jstackVMType = jstackOutputMatcher.group(2)25def jstackVMTypeMatcher = Pattern.compile("(.*)\\(\\S+

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