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Guessbook tutorial: Java EE 6 JPA Tutorial - Maven Project

I have a Max OSX Lion and am running Netbeans 7.2 with Glassfish 3.1.2. I download the tutorial and run it. The moment I type something in the sign in block and click add, I get the following error trace: (Does anyone know a fix?) WARNING: EJB5184:A system exception occurred during an invocation
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Step 2: Define a JPA Entity Class

Java Class] dialog box, e.g. by right clicking the tutorial package node (in the [Projects] window ... class name. The package name should be tutorial. Click Finish to create the new class. Use copy and paste to fill the new source file with the following content: package tutorial; import java.io
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Getting Started with JPA

This tutorial demonstrates how to create and run a simple JPA application. The demonstrated ... to start by running a live sample application in your IDE, you should be able to follow this tutorial easily, even if you are completely new to JPA. This tutorial is available in the following versions
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Step 5: Add a JSP Page

Tutorial</title> </head> <body> <form method="POST" action="guest ... ). The next step (and the last in this tutorial) is running the web application.
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Step 4: Add a Servlet Class

: If a new guest has registered (using a JSP form that will be added in the next tutorial step) - a new ... is forwarded to the JSP page (which is presented in the next tutorial step). The JSP uses the "guest
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Step 3: Add a Main Class

to replace the content of the Main class with the following content: package tutorial; import javax ... Tour chapter of the ObjectDB Manual. The next step (and the last in this tutorial) is running the project.
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Step 1: Create a Java Project

We start by creating a new NetBeans Project: Open the [New Project] dialog box, e.g. by using File > New Project... Select Java > Java Application and click Next. Choose a Project Name (e.g. Tutorial). The name of the Main class should be tutorial.Main. Verify that exactly this case sensitive fully
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Step 4: Add a Controller Class

guest has registered (using a JSP form that will be added in the next tutorial step) - a new Guest ... (which is presented in the next tutorial step) that generates the HTML output. The JSP uses the GuestDao
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Step 5: Add a JSP Page

"> <html> <head> <title>JPA Guestbook Web Application Tutorial</title> </head ... (and the last in this tutorial) is setting the Spring XML configuration.
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Step 7: Run the Spring Web App

at http://localhost:8080/Guestbook/. This tutorial should also run with GlassFish 3.0.1, with a small ... ) is automatically enabled without specifying a Java agent. This is the end of the tutorial. Learn more about ObjectDB and JPA by reading the Manual.

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

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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