Hi,
Suggested patch for bug 6523160 :RuntimeMXBean.getUptime() returns
negative values. No unit test unfortunately, works on my Kubuntu Linux
though. Diff created against svn revision 235.
Cheers,
Lars
--- origjdk/jdk/trunk/j2se/src/share/classes/sun/management/RuntimeImpl.java 2007-05-16 21:06:59.000000000 +0200
+++ jdk/trunk/j2se/src/share/classes/sun/management/RuntimeImpl.java 2007-05-17 01:37:58.000000000 +0200
@@ -32,6 +32,7 @@
import java.util.Map;
import java.util.Set;
import java.util.Properties;
+import java.util.concurrent.TimeUnit;
import javax.management.openmbean.CompositeData;
import javax.management.openmbean.CompositeDataSupport;
import javax.management.openmbean.CompositeType;
@@ -50,6 +51,7 @@
private final VMManagement jvm;
private final long vmStartupTime;
+ private final long nanoStartup;
/**
* Constructor of RuntimeImpl class.
@@ -57,6 +59,7 @@
RuntimeImpl(VMManagement vm) {
this.jvm = vm;
this.vmStartupTime = jvm.getStartupTime();
+ this.nanoStartup = System.nanoTime();
}
public String getName() {
@@ -114,12 +117,12 @@
}
public long getUptime() {
- long current = System.currentTimeMillis();
-
+ long diff = System.nanoTime() - nanoStartup;
+
// TODO: If called from client side when we support
// MBean proxy to read performance counters from shared memory,
// need to check if the monitored VM exitd.
- return (current - vmStartupTime);
+ return TimeUnit.NANOSECONDS.toMillis(diff);
}
public long getStartTime() {
