diff -r e5713cefcf41 -r 6733a9176cce src/jdk.jcmd/linux/classes/sun/tools/ProcessHelper.java
--- a/src/jdk.jcmd/linux/classes/sun/tools/ProcessHelper.java	Mon Apr 08 15:01:39 2019 +0100
+++ b/src/jdk.jcmd/linux/classes/sun/tools/ProcessHelper.java	Mon Apr 08 17:09:02 2019 +0000
@@ -31,7 +31,6 @@
 import java.nio.file.Paths;
 import java.util.jar.Attributes;
 import java.util.jar.JarFile;
-import java.util.jar.Manifest;
 import java.util.stream.Stream;
 
 /**
@@ -50,9 +49,12 @@
 
     /**
      * Gets the main class name for the given Java process by parsing the
-     * process command line.
+     * process command line. If the application was started with the <em>-jar</em>
+     * option this method returns the name of the jar file. If the application
+     * was started with <em>-m</em> or <em>--module</em> option, the method returns
+     * the module name and the main class name.
      * @param pid - process ID (pid)
-     * @return main class name or null if the process no longer exists or
+     * @return the main class name or null if the process no longer exists or
      * was started with a native launcher (e.g. jcmd etc)
      */
 
@@ -81,20 +83,16 @@
             }
         }
 
-        // If -jar option is used then read the main class name from the manifest file.
-        // Otherwise, the main class name is either specified in -m or --module options or it
-        // is the first part that is not a Java option (doesn't start with '-' and is not a
-        // classpath or a module path).
+        // To be consistent with the behavior on other platforms, if -jar, -m, or --module
+        // options are used then just return the value (the path to the jar file or module
+        // name with a main class). Otherwise, the main class name is the first part that
+        // is not a Java option (doesn't start with '-' and is not a classpath or a module
+        // path).
 
         for (int i = 1; i < parts.length && mainClass == null; i++) {
             if (i < parts.length - 1) {
-                // Check if the module is executed with explicitly specified main class
-                if ((parts[i].equals("-m") || parts[i].equals("--module"))) {
-                    return getMainClassFromModuleArg(parts[i + 1]);
-                }
-                // Check if the main class needs to be read from the manifest.mf in a JAR file
-                if (parts[i].equals("-jar")) {
-                    return getMainClassFromJar(parts[i + 1], pid);
+                if (parts[i].equals("-m") || parts[i].equals("--module") || parts[i].equals("-jar")) {
+                    return parts[i + 1];
                 }
             }
             // If this is a classpath or a module path option then skip the next part
@@ -114,34 +112,6 @@
 
     }
 
-    private String getMainClassFromModuleArg(String moduleArg) {
-        int pos = moduleArg.lastIndexOf("/");
-        return (pos > 0 && pos < moduleArg.length()-1) ? moduleArg.substring(pos + 1) : null;
-    }
-
-    private String getMainClassFromJar(String jar, String pid) {
-        if (!jar.startsWith("/")) {
-            String cwd = getCurrentWorkingDir(pid);
-            if (cwd != null) {
-                jar = cwd + "/" + jar;
-            }
-        }
-        try (JarFile jarFile = new JarFile(jar)) {
-            Manifest mf = jarFile.getManifest();
-            if (mf != null) {
-                Attributes mainAttributes = mf.getMainAttributes();
-                return mainAttributes.getValue("Main-Class");
-            }
-        } catch (IOException e) {
-            return null;
-        }
-        return null;
-    }
-
-    private static String getCurrentWorkingDir(String pid) {
-        return ("/proc/" + pid + "/cwd");
-    }
-
     private static String getCommandLine(String pid) {
         try (Stream<String> lines =
                      Files.lines(Paths.get("/proc/" + pid + "/cmdline"))) {