Tables are not generated in database even when i set attribute javax.persistence.schema-generation.database.action to create and connection string javax.persistence.jdbc.url to jdbc:derby:db;create=true persistence.xml: my testing method: As you can see, I also tried to override properties by supplying them t…
Tag: derby
Do foreign keys in apache derby automatically populate a column?
Recently I’ve been trying to create a RDB, and the problem I’m running into is that the columns I have with a foreign key constraint will not populate with the values of the referenced column (it will have null values). The only way I’ve managed to have the correct values is to populate it m…
Derby: Another instance of Derby may have already booted the database
I would like to use Derby in a Network Server Mode and followed the instructions on their website. Starting derby: Connecting with ij: Connecting to Derby in Java: The DriverManager.getConnection() is failing with: Haven’t I just started derby in network server mode? Why am I getting this error? Answer …
Cannot create JDBC driver of class ‘ ‘ for connect URL ‘null’ : I do not understand this exception
Why does it say null URL and gives a empty ‘ ‘ class in the exception when I have provided the database URL? I am trying to connect to a derby database via a servlet while using Tomcat. When the servlet gets run, I get the following exceptions: Servlet : What exception is this? Why do I get this e…