Black and white Computer

When try to connect to the local database , you found this message : Status : Failure -Test failed: Listener refused the connection with the following error: ORA-12505, TNS:listener does not currently know of SID given in connect descriptor I consider this as error ORA-1250. In my case ,to solve this problem you need to change the SID " xe " to " e161306 " then the problem solved! Then the question come when you try, you may be fail because the SID for mine may differ from yours! If you have dint change the Connection name , then you will see that there will be some word behind the dash '-', you should key in the word behind into the SID. Like mine is 'e161306'. How to know your SID? I think it was quite easy! All you need is open your msconfig if you are using Microsoft windows Operating System. Start --> run-->type in "msconfig"/ Start --> type in msconfig--> click msconfig.exe After you open the msconfig, yo...

I recently trying to add the derby plugin into the eclipse. When I try to add derby nature (PS: right-click on the java project -> "Apache Derby" -> "Add Apache Derby nature"  ),I get the pop up says : Error adding Derby jars to the project: org.eclipse.ui.internal.WorkbenchWindow cannot be cast to org.eclipse.jface.window.ApplicationWindow error pop up Does this picture look familiar? Error adding Derby jars to the project What I was Using is when facing this problem : jdk1.7.0_03 Eclipse IDE for Java EE Developers (Win32) version Juno (build from 2012/06/14)  derby-core-plugin 10.8.2 and -ui-plugin 1.1.3 (as there is no eclipse plugin for the latest version 10.9.1.0)  I also google about this problem before but i can't find any solution. After I try many time ,I finally found a way to solve it! A bad method,but take a look! Solution: The solution is d ownload another version of Eclipse IDE for Java EE Developers like Europa! Y...