Hi David and JC, Thank you for reviewing this change. Please review a new version of the fix that adds additional tests as David suggested. The tests are added to test/hotspot/jtreg/serviceability/dcmd/framework/VMVersionTest.java and test the cases when Java process is started with -jar or -m (--module) options. Since unnamed packages are not allowed in the modules, file test/hotspot/jtreg/serviceability/dcmd/framework/TestJavaProcess.java was moved to test/hotspot/jtreg/serviceability/dcmd/framework/process/TestJavaProcess.java.
Webrev: http://cr.openjdk.java.net/~dtitov/8221730/webrev.02/ Bug: https://bugs.openjdk.java.net/browse/JDK-8221730 Thanks! --Daniil On 4/3/19, 5:23 PM, "David Holmes" <[email protected]> wrote: Hi Daniil, This seems reasonable, but can we add a suitable regression test please to verify behaviour before JDK-8205654 and with this fix. Thanks, David On 4/04/2019 5:02 am, Daniil Titov wrote: > Please review the change that makes jcmd process name matching on Linux platform consistent with pre-existing behavior. > > On other platforms (and on Linux platform before changes [3]) the jcmd uses system property "sun.rt.javaCommand" (see sun.jvmstat.monitor. MonitoredVmUtil.mainClass(MonitoredVm, boolean) that is called from sun.tools.common. ProcessArgumentMatcher at line 96) and treats the part before the first space as a main class when matching the process name. However, if the application is started with -jar option this part contains the path to the jar file. If -m or --module option is used this part contains the module name and the main class (if the main class was specified in the command line) in the format <modulename>/<mainclass>. After changes [3] , on Linux platform the proc filesystem is used to find a Java process, however, it always matches the process name against the main class regardless what options were used to launch the application. This created discrepancies between old and new behavior on Linux platform as well as between behavior on Linux and other platforms. Th! > e fix changes sun.tool.ProcessHelper (that was introduced in [3]) to correct these discrepancies. > > > Reference: > [1] Webrev: http://cr.openjdk.java.net/~dtitov/8221730/webrev.01 > [2] Bug: https://bugs.openjdk.java.net/browse/JDK-8221730 > [3] https://bugs.openjdk.java.net/browse/JDK-8205654 > > > Thanks! > --Daniil > >
