Note: The following stuff is not Hibernate specific but is true for every JPA2 provider and falls into the category of JPA criteria query. Some days ago i just saw this video Christin Gorman about Hibernate. Although i don’t agree with her and i actually do like hibernate as a great tool, there are certainly […]
Java Authentication and Authorization Service aka JAAS is a pretty neat way to build a pluggable authentication mechanism for a Java application. My goal was to build a Single Sign-on (SSO) mechanism targeted on Windows machines (Windows XP SP3, Windows 7) that uses the cached kerberos ticket. The jaas configuration should be pretty simple: name_of_the_login_context […]
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. […]
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)); } }import java.lang.management.ManagementFactory; public class Demo { public static void main(String… args) { […]
Javas ImageIO works… well, most of the time. It contains some unfixed, jpeg related bugs, but it works. It may contain some dangers when used in a webbased application for generation large images on the fly. Most problems are related to ImageIOs filed based caching and not flushing buffers when an IOException in an underlying […]