No Persistence provider for EntityManager named
After <persistence-unit name=”agisdb”>, define the persistence provider name:
Java
javac error: Class names are only accepted if annotation processing is explicitly requested
You at least need to add the .java extension to the file name in this line: From the official faq: Class names, ‘HelloWorldApp’, are only accepted if annotation processing is explicitly requested If you receive this error, you forgot to include the .java suffix when compiling the program. Remember, the command is javac HelloWorldApp.java not … Read more
Bubble Sort Manually a Linked List in Java
The problem, as expected, comes in method sort(): A minor problem is just do always execute the bubble sort n*n times. It is actually better check whether there was a change between any pair in the list. If it was, then there is the need to run again all over the list; if not, there … Read more
JAVA_HOME should point to a JDK not a JRE
Control Panel -> System and Security -> System -> Advanced system settings -> Advanced -> Environment Variables -> New System Variable
Filling a 2D array in Java
Arrays in Java are zero-based, which means they start at index zero, and range until index array.length-1. Your code starts the row and column at 1—which means you’re skipping the initialization of row/column 0. That’s probably where at least some of the problems are coming from, since you’re using your 5×5 array (rows/columns 0,1,2,3,4) as … Read more
IO Error: The Network Adapter could not establish the connection
I am new to Oracle, and am trying to run a simple example code with Java, but am getting this error when executing the code.. I am able to start up the listener via CMD and am also able to run SQL Plus. Can anyone give me a hand and tell me what I might … Read more
java.lang.ClassNotFoundException: sun.jdbc.odbc.JdbcOdbcDriver Exception occurring. Why?
I have created an MS Access database and assigned a DSN to it. I want to access it through my Java application. This is what I am doing: I am getting the exception at the first line of try block. That is class.forname(“..”);. Why am I having this Exception?
Error – Illegal static declaration in inner class
What does this mean? My code:
Efficient swapping of elements of an array in Java
Nope. You could have a function to make it more concise each place you use it, but in the end, the work done would be the same (plus the overhead of the function call, until/unless HotSpot moved it inline — to help it with that, make the function static final).
How can I edit a .jar file?
So I have a jar file with one .class file on it. I just need to change some words in the file. What program should I use? I want this to work for my phone.