Only persistence units with transaction type JTA can be used as a container managed entity manager

NetBeans can use multiple deployment servers. When your web application uses the Entity Framework and you select the Glassfish server as the deployment server, you can get the error message when you try to run your application in the IDEÉ

Severe: Exception while preparing the app : The persistence-context-ref-name […] in module […] resolves to a persistence unit called […] which is of type RESOURCE_LOCAL. Only persistence units with transaction type JTA can be used as a container managed entity manager. Please verify your application.

When you first run the application NetBeans asks you to select the deployment server you want to use.

If only the Glassfish server is available, and Tomcat is installed on your workstation, add Tomcat to the available deployment servers.

Install Tomcat

For the Tomcat installation see Tomcat web server installation

Add Tomcat to the NetBeans server list

  1. In the Tools menu select Servers
  2. Click the Add Server button
  3. In the list select the Apache Tomcat or TomEEE server
  4. Click the Browse… button
  5. Select the Tomcat directory on your workstation
  6. Enter a Tomcat username and password for NetBeans, and click the Finish button.
  7. The user will be created in the tomcat-users.xml file in the Tomcat conf directory
  8. Click the Close button.

Select the Deployment Server

  1. Right-click the NetBeans project and select Run
  2. In the Select deployment server window select Apache Tomcat or TomEE

If the Select deployment server window does not pop up

  1. Right-click the NetBeans project and select Set Configuration -> Customize
  2. On the Run tab select the Apache server.

Starting of Tomcat failed, the server port 8080 is already in use

  1. If the Glassfish server already started, Tomcat cannot use the same ports and an error message will appear in the NetBeans RunOutput tab
  2. To stop the Glassfish server, restart your workstation.

Start a new Spring MVC Java Web application development in NetBeans

When you create your first Spring MVC Java web application in the base installation of NetBeans follow the steps below

Create a project

  1. In the File menu select New Project
  2. Select the Java Web category, select the Web Application project, and click Next,
  3. Enter the name of the project and click Next,
  4. If this is the first Java web application you create in NetBeans, most likely there is no web server for Java is installed on your workstation. If this is the case, click the Add… button,
  5. Keep the GlassFish Server selected and click Next,
  6. Select the I have read… checkbox and click the Download Now… button,
  7. Keep the latest version selected and click OK,
  8. Make sure the I have read… checkbox is still selected, and click Next,
  9. Click Finish to register the domain on your workstation,
  10. The Context Path shows the address for your application. Click Finish again to continue.
  11. Select the Spring Web MVC framework and click Finish.
  12. If a library is missing from your workstation, a message pops up. Click the Resolve Problems… button for instructions,
  13. On the Resolve Project Problems window click the Resolve… button,
  14. Download the missing library to your workstation. In this case, navigate your web browser to http://www.java2s.com/Code/Jar/j/Downloadjavaeeendorsedapi70jar.htm
  15. Download the “javaee-endorsed-api-7.0.jar” library
  16. Create the folder C:\Users\YOUR_USER_NAME\AppData\Roaming\NetBeans\8.2\modules\ext\javaee7-endorsed
  17. Extract the “javaee-endorsed-api-7.0.jar” file into the new folder,
  18. On the Ant Library Manager window click the New Library… button,
  19. Enter “javaee-endorsed-api-7.0” into the Library Name field and click OK,
  20. Click the Add JAR/Folder… button,
  21. Navigate the to extracted JAR file at “C:\Users\YOUR_USER_NAME\AppData\Roaming\NetBeans\8.2\modules\ext\javaee7-endorsed” and click the Add JAR/Folder button,
  22. On the Ant Library Manager window click the OK button,
  23. On the Resolve Project Problems window click Close.

Start the application

  1. In the Project list right-click the web application project and select Run
  2. The Output window should display a similar message,
  3. Open a web browser and navigate to http://localhost:8080/MY_PROJECT_NAME, to display the index page. The server is case sensitive, so make sure the spelling of the project name is correct.

 

The application configuration files

With the default settings the index.jsp composes the index page. It is in the Web Pages/WEB-INF/jsp directory.

The web.xml file in the Configuration Files directory points to the first Java Server Pages file: redirect.jsp

The redirect.jsp file is located in the Web Pages directory

The Dispatcher

The dispatcher-servlet.xml file contains the mapping between the HTML file, controller, and view.

<property name="mappings">
  <props>
    <prop key="index.htm">indexController</prop>
  </props>
</property>

The bean section specifies the name of the view for the controller.

 <!--
 The index controller.
 -->
 <bean name="indexController"
       class="org.springframework.web.servlet.mvc.ParameterizableViewController"
       p:viewName="index" />

Web Application Build and Deployment

To generate a war file of your web application

  1. In the Project Files directory right click the pom.xml file and select Run Maven > Goals
  2. In the Goals field type
    compile war:war

    and click OK

  3. NetBeans creates the war file in the target directory.

 

error: package … does not exist in NetBeans

If your Java source code imports packages, you have to add the JAR files containing them to the Library.

When you try to compile your Java application in NetBeans, and you get the error message:

error: package … does not exist

  1. In the NetBeans Project view right-click the Libraries folder
  2. In the drop down menu select Add JAR/Folder
  3. Select all the JAR files you want to add to the library, not just the folder,
  4. Click the Open button.