The net.sf.ehcache.transaction.TransactionTimeoutException is one of those unchecked RuntimeExceptions you should take care of if you use ehcache. If this exceptions occurs you must explicitly rollback the ongoing transaction, otherwise all further requests to start an ehcache transaction from within the current thread will fail with another net.sf.ehcache.transaction.TransactionException as the cache is in an inconsistent state.
I do it like so:
final TransactionController transactionController = cacheManager.getTransactionController();
try {
transactionController.begin();
// Do stuff
transactionController.commit();
} catch(TransactionTimeoutException e) {
// Rollback transaction because cache will be invalid from this point
transactionController.rollback();
// Rethrow or handle e in some way
}Share This
You don’t need JConsole or similar for just displaying the approximate uptime of your application respectively your Java Virtual Machine:
import java.lang.management.ManagementFactory;
public class Demo {
public static void main(String... args) {
final long uptime = ManagementFactory.getRuntimeMXBean().getUptime();
System.out.println(String.format("Up for %dms", uptime));
}
}If you use Joda-Time (and you should if you have anything to do with date/datetime processing), you can format it nicely like so:
import java.lang.management.ManagementFactory;
import java.text.MessageFormat;
import org.joda.time.Period;
import org.joda.time.PeriodType;
import org.joda.time.format.PeriodFormatter;
import org.joda.time.format.PeriodFormatterBuilder;
public class Demo {
public static void main(String... args) {
final Period vmUptime = new Period(ManagementFactory.getRuntimeMXBean().getUptime()).normalizedStandard(PeriodType.yearDayTime());
final PeriodFormatter pf = new PeriodFormatterBuilder()
.printZeroAlways()
.appendDays().appendLiteral(MessageFormat.format("{0,choice,0# days, |1# day, |2# days, }", vmUptime.getDays()))
.minimumPrintedDigits(2)
.appendHours().appendLiteral(":").appendMinutes()
.toFormatter();
System.out.println(String.format("Up for %s", pf.print(vmUptime)));
}
}You also have a nice example of the often unknown MessageFormat.
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