Auf JavaHints.de ist ab sofort der Java-Blog von meinem Bruder online. Der Blog an sich ist nichts Neues, jedoch wurde erst kuerzlich auf eine eigene Domain umgeschaltet. Zudem hatte ich noch keinen Blogroll dazu angegeben gehabt. Hier gibt es in unregelmaessigen Abstaenden Quizzes bzg. der programmiersprache Java zu loesen. Loesungen werden stets nach einigen Tagen veroeffentlicht.
Viel Spass auf JavaHints.de!
I've finally released the "NetCalendar 1.0". It has been almost 3 years since 1.0 RC5. However, only a few things have changed. NetCalendar now supports secure sockets using SSL. And the documentation is now completely in english (a part of it used to be in german). I've also managed to include a few cosmetic fixes as well (e.g. new splash screen).
Version 1.1 may will include a nicer configuration dialog and some code refactoring. I've also to look if there is a ready Exchange connector available for Java. This way, I could use the NetCalendar application at work in order to see all my meetings (made with Outlook through an rdeskop session) on my FreeBSD desktop.
I just released the second (v0.2 to be more specific) version of JSMSTrade. JSMSTrade is a very small and handy client (programmed in Java) for SMSTRADE.de for sending SMS messages.
The changes are as follows: The application is now using the english language and is not in german anymore. Also a small bugfix has been included: The input area will not freeze after typing more than 160 chars.
Enjoy ;)
Update: v0.3 has been released now too. This version only includes a major bugfix. Sadly, v0.2 was not able to deliver any SMS messages. This has been fixed by now :)
I've played around with JConsole because I may need this at work in order to monitor running Java processes. At home I finaly found a deadlock in my diploma thesis (distributed systems simulator). I should have used JConsole earlier. It helps so much to auto detect deadlocks in threads!
Just start your Java App like this:
java -Dcom.sun.management.jmxremote -jar VS-Sim.jar
Afterwards run the JConsole with "jconsole" in the CLI and select the JVM of the Java application you want to monitor.
In the "threads" tap you can watch all the threads including detect deadlocks. I found the following deadlock in VS-Sim, which seems to be a specific bug on multi core systems:
Name: Thread-2
State: BLOCKED on java.awt.Component$AWTTreeLock@1c98360 owned by:
AWT-EventQueue-0
Total blocked: 1 Total waited: 14,653
Stack trace:
java.awt.KeyboardFocusManager.clearMostRecentFocusOwner(KeyboardFocusManager.java:1777)
java.awt.Component.disable(Component.java:1286)
javax.swing.JComponent.disable(JComponent.java:3579)
java.awt.Component.enable(Component.java:1275)
java.awt.Component.setEnabled(Component.java:1238)
javax.swing.JComponent.setEnabled(JComponent.java:2647)
javax.swing.AbstractButton.setEnabled(AbstractButton.java:2064)
javax.swing.JMenuItem.setEnabled(JMenuItem.java:294)
simulator.VSSimulatorFrame.updateSimulatorMenu(Unknown Source)
- locked simulator.VSSimulatorFrame@a9ae05
simulator.VSSimulatorFrame.resetCurrentSimulator(Unknown Source)
simulator.VSSimulatorVisualization.finish(Unknown Source)
simulator.VSSimulatorVisualization.run(Unknown Source)
java.lang.Thread.run(Thread.java:619)
Name: AWT-EventQueue-0
State: BLOCKED on simulator.VSSimulatorFrame@a9ae05 owned by: Thread-2
Total blocked: 8 Total waited: 4,628
Stack trace:
java.awt.Frame.getExtendedState(Frame.java:744)
javax.swing.RepaintManager.addDirtyRegion0(RepaintManager.java:407)
javax.swing.RepaintManager.addDirtyRegion(RepaintManager.java:448)
javax.swing.JComponent.repaint(JComponent.java:4732)
java.awt.Component.repaint(Component.java:2970)
java.awt.Component.repaintParentIfNeeded(Component.java:2040)
java.awt.Component.reshape(Component.java:2028)
- locked java.awt.Component$AWTTreeLock@1c98360
javax.swing.JComponent.reshape(JComponent.java:4154)
javax.swing.JViewport.reshape(JViewport.java:854)
java.awt.Component.setBounds(Component.java:1972)
java.awt.Component.setBounds(Component.java:2109)
javax.swing.ScrollPaneLayout.layoutContainer(ScrollPaneLayout.java:869)
java.awt.Container.layout(Container.java:1432)
java.awt.Container.doLayout(Container.java:1421)
java.awt.Container.validateTree(Container.java:1519)
java.awt.Container.validate(Container.java:1491)
- locked java.awt.Component$AWTTreeLock@1c98360
javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:635)
javax.swing.SystemEventQueueUtilities
$ComponentWorkRequest.run(SystemEventQueueUtilities.java:127)
java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
I've released my diploma thesis (an simulator for distributed systems) under the GPL! At the moment only the website at vs-sim.buetow.org is in english and the simulator itself in german. The simulator is written in Java (requires Java 6). I'll add an english version of the simulator too within the next month! The simulator is good for universities in order to teach distributed systems.
I recieved a grade of 1.0 (which is the best) for this diploma thesis :) I'll enjoy any feedback! Have a lot of fun :)
Auf chaosradio.ccc.de gibt es nun wieder ein neues Express Podcast (#090). Dieses Mal geht's über Java. Viel Spaß dabei :)
First, it was a nice suprise that I was able to install and run the Elster Formular application (proprietary software for Windows of the german government for registering your taxes online) under Wine.
However, after trying to submit my taxes online, I recv. the following error dialog (and Elster on Windows XP works without problems):
Too bad :/ Well, but recently the german government also offers a Java Applet for submitting the tax infos. I think I'll have to give it a try, so I can avoid using my Windows XP installation :)
I don't know why Elster is not working on Wine. I remember about half an year ago, I was able to submit my tax infos once using Elster on Wine.
JSMSTrade v0.1 has been released. Its website is located at jsmstrade.buetow.org (jsmstrade.bue). JSMSTrade is a small and simple Java Application, using the GPL license, to use with SMSTRADE and can be downloaded for free. Currently the JSMStrade is available in german only.
