How to set the system time in the program

Hi All,
How do we update the system time inside java programme.

AFAIK there is no easy (pure java) way: either you exec something (depending on your paltform) or use native code. Appropriate privileges will be necessary.

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Hi,
I am trying to change the System time where the Web-logic server (11g) runs using Mocking. I use "jmockit.jar" to mock the System.class. A Spring bean is created and through that I try to change the System time. I need to change the time for testing scenarios. For example, I need to backdate and do the testing for some scenarios. For the moment I do this manually and I want to automate this by changing only the time in the JVM where the application server runs. When I try to automate this using the Spring bean, I get an error as follows. Do anyone have any idea about this.
[WLServer adminserver] Exception in thread "Timer-5" java.lang.IllegalArgumentException: No class with name "com.abc.common.service.impl.MockSystem" found
[WLServer adminserver] at mockit.internal.util.Utilities.loadClass(Utilities.java:71)
[WLServer adminserver] at mockit.internal.MockingBridge.callMock(MockingBridge.java:156)
[WLServer adminserver] at mockit.internal.MockingBridge.invoke(MockingBridge.java:85)
[WLServer adminserver] at java.lang.System.currentTimeMillis(System.java)
[WLServer adminserver] at java.util.TimerThread.mainLoop(Timer.java:495)
[WLServer adminserver] at java.util.TimerThread.run(Timer.java:462)
[WLServer adminserver] Exception in thread "DynamicListenThread[Default]" java.lang.IllegalArgumentException: No class with name "com.common.service.impl.MockSystem" found
[WLServer adminserver] at mockit.internal.util.Utilities.loadClass(Utilities.java:71)
[WLServer adminserver] at mockit.internal.MockingBridge.callMock(MockingBridge.java:156)
[WLServer adminserver] at mockit.internal.MockingBridge.invoke(MockingBridge.java:85)
[WLServer adminserver] at java.lang.System.currentTimeMillis(System.java)
[WLServer adminserver] at java.util.logging.LogRecord.<init>(LogRecord.java:139)
[WLServer adminserver] at com.bea.logging.BaseLogRecord.<init>(BaseLogRecord.java:33)
[WLServer adminserver] at com.bea.logging.BaseLogRecord.<init>(BaseLogRecord.java:48)
[WLServer adminserver] at com.bea.logging.BaseLogRecord.<init>(BaseLogRecord.java:70)
[WLServer adminserver] at weblogic.logging.WLLogRecord.<init>(WLLogRecord.java:63)
[WLServer adminserver] at weblogic.logging.JDKLoggerFactory.createBaseLogRecord(JDKLoggerFactory.java:74)
[WLServer adminserver] at com.bea.logging.LoggingService.log(LoggingService.java:216)
[WLServer adminserver] at weblogic.server.ServerLogger.logListenThreadFailure(ServerLogger.java:205)
[WLServer adminserver] at weblogic.server.channels.DynamicListenThread.run(DynamicListenThread.java:197)
[WLServer adminserver] at java.lang.Thread.run(Thread.java:619)
[WLServer adminserver] Exception in thread "weblogic.timers.TimerThread" java.lang.IllegalArgumentException: No class with name "com.abc.common.service.impl.MockSystem" found
[WLServer adminserver] at mockit.internal.util.Utilities.loadClass(Utilities.java:71)
[WLServer adminserver] at mockit.internal.MockingBridge.callMock(MockingBridge.java:156)
[WLServer adminserver] at mockit.internal.MockingBridge.invoke(MockingBridge.java:85)
[WLServer adminserver] at java.lang.System.currentTimeMillis(System.java)
[WLServer adminserver] at weblogic.timers.internal.TimerThread$Thread.run(TimerThread.java:256)
[WLServer adminserver] Exception in thread "Timer-4" java.lang.IllegalArgumentException: No class with name "com.abc.common.service.impl.MockSystem" found
[WLServer adminserver] at mockit.internal.util.Utilities.loadClass(Utilities.java:71)
[WLServer adminserver] at mockit.internal.MockingBridge.callMock(MockingBridge.java:156)
[WLServer adminserver] at mockit.internal.MockingBridge.invoke(MockingBridge.java:85)
[WLServer adminserver] at java.lang.System.currentTimeMillis(System.java)
[WLServer adminserver] at java.util.TimerThread.mainLoop(Timer.java:495)
[WLServer adminserver] at java.util.TimerThread.run(Timer.java:462)
[WLServer adminserver] Exception in thread "ClusterNode-localhost" java.lang.IllegalArgumentException: No class with name "com.abc.common.service.impl.MockSystem" found
[WLServer adminserver] at mockit.internal.util.Utilities.loadClass(Utilities.java:71)
[WLServer adminserver] at mockit.internal.MockingBridge.callMock(MockingBridge.java:156)
[WLServer adminserver] at mockit.internal.MockingBridge.invoke(MockingBridge.java:85)
[WLServer adminserver] at java.lang.System.currentTimeMillis(System.java)
[WLServer adminserver] at EDU.oswego.cs.dl.util.concurrent.Latch.attempt(Unknown Source)
[WLServer adminserver] at org.apache.jackrabbit.core.cluster.ClusterNode.run(ClusterNode.java:261)
[WLServer adminserver] at java.lang.Thread.run(Thread.java:619)
[WLServer adminserver] Exception in thread "Timer-1" java.lang.IllegalArgumentException: No class with name "com.abc.common.service.impl.MockSystem" found
[WLServer adminserver] at mockit.internal.util.Utilities.loadClass(Utilities.java:71)
[WLServer adminserver] at mockit.internal.MockingBridge.callMock(MockingBridge.java:156)
[WLServer adminserver] at mockit.internal.MockingBridge.invoke(MockingBridge.java:85)
[WLServer adminserver] at java.lang.System.currentTimeMillis(System.java)
[WLServer adminserver] at java.util.TimerThread.mainLoop(Timer.java:495)
[WLServer adminserver] at java.util.TimerThread.run(Timer.java:462)
[WLServer adminserver] Exception in thread "ClusterNode-localhost" java.lang.IllegalArgumentException: No class with name "com.abc.common.service.impl.MockSystem" found
[WLServer adminserver] at mockit.internal.util.Utilities.loadClass(Utilities.java:71)
[WLServer adminserver] at mockit.internal.MockingBridge.callMock(MockingBridge.java:156)
[WLServer adminserver] at mockit.internal.MockingBridge.invoke(MockingBridge.java:85)
[WLServer adminserver] at java.lang.System.currentTimeMillis(System.java)
[WLServer adminserver] at EDU.oswego.cs.dl.util.concurrent.Latch.attempt(Unknown Source)
[WLServer adminserver] at org.apache.jackrabbit.core.cluster.ClusterNode.run(ClusterNode.java:261)
[WLServer adminserver] at java.lang.Thread.run(Thread.java:619)
[WLServer adminserver] Exception in thread "Timer-2" java.lang.IllegalArgumentException: No class with name "com.abc.common.service.impl.MockSystem" found
[WLServer adminserver] at mockit.internal.util.Utilities.loadClass(Utilities.java:71)
[WLServer adminserver] at mockit.internal.MockingBridge.callMock(MockingBridge.java:156)
[WLServer adminserver] at mockit.internal.MockingBridge.invoke(MockingBridge.java:85)
[WLServer adminserver] at java.lang.System.currentTimeMillis(System.java)
[WLServer adminserver] at java.util.TimerThread.mainLoop(Timer.java:495)
[WLServer adminserver] at java.util.TimerThread.run(Timer.java:462)
[WLServer adminserver] Exception in thread "weblogic.time.TimeEventGenerator" java.util.MissingResourceException: Can't locate bundle for class 'weblogic.common.T3MiscLogLocalizer'
[WLServer adminserver] at weblogic.i18ntools.L10nLookup.getLocalizer(L10nLookup.java:427)
[WLServer adminserver] at weblogic.i18n.logging.CatalogMessage.<init>(CatalogMessage.java:47)
[WLServer adminserver] at weblogic.common.T3MiscLogger.logThrowable(T3MiscLogger.java:325)
[WLServer adminserver] at weblogic.time.common.internal.TimeEventGenerator.run(TimeEventGenerator.java:126)
[WLServer adminserver] at java.lang.Thread.run(Thread.java:619)
OR
Do anyone know any other way to overcome this issue using some other mocking jar.
Thanks
Edited by: 913136 on Feb 8, 2012 2:32 AM

Hi,
I could manage to change the time in JVM where the Weblogic server runs. I loaded an Spring bean from my Test class and from that bean I set an offset (to shift the time) in the Mock class (say, MockSystem class). In this case I used the jmockit implementation for instrumentation purposes. The MockSystem class should not be instantiated by us and jmockit takes care of that part. What I had to do was defining the javaagent and another parameter ("-Djmockit-mocks=com.abc.common.service.impl.MockSystem") in the Weblogic server build XML (mentioned in the following URL[1]). But to work this the MockSystem.class file should be wrapped in a JAR file and included in Weblogic server/lib directory and define it in the Weblogic build XML file as a classpath. For more explanations visit this URL [2].
[1]. http://jmockit.googlecode.com/svn/trunk/www/javadoc/mockit/Mockit.html#setUpStartupMocks%28java.lang.Object...%29
[2]. http://code.google.com/p/jmockit/issues/detail?can=2&start=0&num=100&q=&colspec=ID%20Tool%20Type%20Status%20Priority%20Summary&groupby=&sort=&id=207
Thanks
-thiwanka-

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