Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.
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and locking in Linux, if parallel processes access different files in the same directory ... and directories on our side, it has nothing to do the database issue. The issue occurs, if two different jvm run in parallel and access their own databases. The databases have their own temp directorys like
files or exploded jar file directories that the persistence provider must examine for managed classes of the persistence unit. Returns a list of URLs for the jar files or exploded jar file directories ... referring to a jar file or referring to a directory that contains an exploded jar file, or some other URL
for the jar file or directory that is the root of the persistence unit. (If the persistence unit is rooted in the WEB-INF/classes directory, this will be the URL of that directory.) The URL will either be a file: URL referring to a jar file or referring to a directory that contains an exploded jar
for the jar files or exploded jar file directories that the persistence provider must examine ... .xml file. A URL will either be a file: URL referring to a jar file or referring to a directory ... can be obtained. Returns: a list of URL objects referring to jar files or directories Since: JPA 1.0
installation directory and click Open. Now you should have a NetBeans Web Application project
To open and run the Java EE 6 Web Application tutorial project in IntelliJ IDEA: Download and extract the project zip file: Java EE JPA Web App - Maven Project (7KB) Open the project in IntelliJ IDEA: Select File > Open Project.... Select the guestbook-jee6 directory and click OK. Define the Server
To open and run the Spring MVC JPA tutorial project in NetBeans: Download and extract the project zip file: Spring MVC JPA - Maven Project (8KB) Open the Maven project in NetBeans: Select File > Open Project.... Select the guestbook-spring directory and click Open Project. Run the project: Select
. Since we are using ObjectDB in embedded mode - the database file is created under the Tomcat directory
.declareImports( "import java.util.*; import directory.pc.Category;"); The argument of declareImports
the JDO and ObjectDB jar files into the WEB-INF/lib directory of the web application, and database support (in embedded mode) is made available.