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*
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* 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 ) .
*
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*/
/**
* @ test
* @ bug 8035668
* @ library / test / lib
* @ summary Test checks case when target application finishes execution and jstat didn ' t complete work .
jstat is started with interval = 100 ( jstat - compiler 100 ) and monitored application finishes
after 500 ms . This shouldn ' t cause crash or hang in target application or in jstat .
* @ modules java . management
* @ build JStatInterval
* @ run main JStatInterval
*/
import jdk.test.lib.JDKToolLauncher;
import jdk.test.lib.Utils;
import jdk.test.lib.process.ProcessTools;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
public class JStatInterval {
private static final String READY = "READY" ;
private static final String ERROR = "!ERROR" ;
public static class Application {
public static void main(String[] args) {
try {
System.out.println(READY);
System.out.flush();
int exitCode = System.in.read();
Thread .sleep(500 );
System.exit(exitCode);
} catch (Exception e) {
System.out.println(ERROR);
System.out.flush();
throw new Error(e);
}
}
}
public static void main(String[] args) throws Exception {
ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
"-cp" ,
System.getProperty("test.class.path" ),
"-XX:+UsePerfData" ,
Application.class .getName()
);
AtomicBoolean error = new AtomicBoolean(false );
Process app = ProcessTools.startProcess(
"application" ,
pb,
line -> {
if (line.equals(READY)) {
return true ;
} else if (line.equals(ERROR)) {
error.set(true );
return true ;
}
return false ;
},
10 ,
TimeUnit.SECONDS
);
if (error.get()) {
throw new Error("Unable to start the monitored application." );
}
String pidStr = String.valueOf(app.pid());
JDKToolLauncher l = JDKToolLauncher.createUsingTestJDK("jstat" );
l.addVMArgs(Utils.getTestJavaOpts());
l.addToolArg("-compiler" );
l.addToolArg(pidStr);
l.addToolArg("100" );
ProcessBuilder jstatDef = new ProcessBuilder(l.getCommand());
Process jstat = ProcessTools.startProcess(
"jstat" ,
jstatDef,
line -> {
if (line.trim().toLowerCase().startsWith("compiled" )) {
return true ;
}
return false ;
},
10 ,
TimeUnit.SECONDS
);
app.getOutputStream().write(0 );
app.getOutputStream().flush();
if (app.waitFor() != 0 ) {
throw new Error("Error detected upon exiting the monitored application with active jstat" );
}
if (jstat.waitFor() != 0 ) {
throw new Error("Error detected in jstat when monitored application has exited prematurely" );
}
}
}
Messung V0.5 in Prozent C=97 H=96 G=96
¤ Dauer der Verarbeitung: 0.10 Sekunden
(vorverarbeitet am 2026-10-11)
¤
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