org.apache.jasper.JasperException: java.lang.IllegalStateException: No output folder

This error can happen on Linux and Windows, and the cause could be the same.

On Windows Server 2012R2 I opened a command prompt. To be able to delete a directory from the Tomcat webapps folder, I have issued the shutdown command.

When I started the server with the startup command, and navigated to my local website, my Java Spring MVC web application displayed the error message

org.apache.jasper.JasperException: java.lang.IllegalStateException: No output folder

The problem was, that the Tomcat service runs under root on Linux, and SYSTEM on Windows.

When you issue the startup command, Tomcat will run under the user account you logged in with.


Stop and start the TomCat Linux or Windows service instead of issuing the shutdown and startup commands from the terminal or command prompt.


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.

Deploy a WAR file of a Java web application on the Apache Tomcat web server

There are two ways to deploy a WAR file of a Java web application on the Apache Tomcat web server

Using the command line

  1. Copy the WAR file into the webapps folder of the Tomcat installation directory,
  2. Make sure the CATALINA_HOME environment variable points to the Tomcat directory (not the bin subdirectry)
  3. Open a Terminal window or Command Prompt,
  4. Navigate to the bin directory of the Tomcat web server installation directory,
  5. Execute
  6. Tomcat will unzip the war file into a directory named after the WAR file and display the message similar to this.

    C:\Program Files\apache-tomcat-8.5.23\bin>startup
    Using CATALINA_BASE: “C:\Program Files\apache-tomcat-8.5.23”
    Using CATALINA_HOME: “C:\Program Files\apache-tomcat-8.5.23”
    Using CATALINA_TMPDIR: “C:\Program Files\apache-tomcat-8.5.23\temp”
    Using JRE_HOME: “C:\Program Files\Java\jre-9.0.1”
    Using CLASSPATH: “C:\Program Files\apache-tomcat-8.5.23\bin\bootstrap.jar;C:\Program Files\apache-tomcat-8.5.23\bin\tomcat-juli.jar”C:\Program Files\apache-tomcat-8.5.23\bin>

Using the Tomcat user interface

  1. Remote into the web server,
  2. Copy the WAR file to a temp directory,
  3. Open the Tomcat web user interface at http://localhost:8080/manager
  4. Log in with the credentials specified for the manager-gui role in the tomcat-users.xml file of the conf Tomcat folder,
  5. In WAR file to deploy section click the Choose File button and select the WAR file,
  6. Click the Deploy button,
  7. Tomcat will unzip the war file into a directory named after the WAR file in the webapps folder of the Tomcat installation directory.

Tomcat web server configuration

When you install the Apache Tomcat web server there are some configuration settings you need to make to be able to administer and use it.

Administrator user accounts

When you install the Apache Tomcat web server there is no admin user account specified, so nobody can log into the admin web user interface. To add an admin user account

  1. Remote into the web server
  2. Open the Tomcat user configuration file at
    1. On Linux at $TOMCAT_HOME/conf/tomcat-users.xml
    2. On Windows at C:\Program Files\apache-tomcat-…\conf\tomcat-users.xml
  3. Add an admin user
      <role rolename="tomcat"/>
      <role rolename="role1"/>
      <user username="tomcat" password="tomcat" roles="tomcat"/>
      <user username="both" password="tomcat" roles="tomcat,role1"/>
      <user username="role1" password="tomcat" roles="role1"/>
    	<role rolename="manager-gui"/>
    	<user username="admin" password="admin" roles="manager-gui"/>
  4. Restart the Tomcat service for the change to take effect.


With the default settings, Tomcat is accessible on port 8080. To be able to use the web applications served by Tomcat, open port 8080 on the local firewall.

Tomcat web server installation

Tomcat is one of the most popular free web servers. Tomcat runs on the Linux, Macintosh, and Windows operating systems.

To install Tomcat

Install the Java Runtime Environment (JRE)

  1. Download the Java JRE from
  2. Install the Java JRE

On Windows

  1. Execute the downloaded .exe file
  2. Create an environment variable to point to the installed Java
    1. If you installed the Java JDK (Java Development Kit)
      1. JAVA_HOME=c:\Program Files\Java\jdk-…
    2. If you installed the JRE (Java Runtime Environment)
      1. JRE_HOME=C:\Program Files\Java\jre-…


Install Tomcat

  1. Download the Tomcat installer from
  2. To select the right file to download read the explanation on the page linked to “Please see the README file for packaging information”.

On Windows

Select the installer based on the operating system and the Java environment you want to run:

  • 32 bit Java Virtual Machine on32 bit or 64 bit Windows: apache-tomcat-[version]
  • 64 bit Java Virtual Machine on 64 bit Windows: apache-tomcat-[version]
  1. Unzip the downloaded archive and move the apache-tomcat-x.x.x directory to C:\Program File
  2. Create the Tomcat environment variable
    CATALINA_HOME=C:\Program Files\apache-tomcat-x.x.x

Start Tomcat

  1. Open a terminal or console in the Tomcat bin directory
  2. Execute
  3. Enable the access to the Tomcat server through the firewall
    1. On Windows

Test Tomcat

  1. Open a web browser on the server and navigate to http://localhost:8080/
  2. You should see the Tomcat default page

Auto start Tomcat

If you want to use Tomcat as a web server, it should start automatically when the computer starts.

On Windows

  1. Open a command prompt in the tomcat bin directory
  2. Execute
    service.bat install
  3. On the User Account Control popup click the Yes button
  4. The last message in the command prompt should say

    The service ‘Tomcat..’ has been installed.

  5. Open  Services and select the Apache Tomcat service
  6. Set the Startup type to Automatic, click the Start button to start the service, and click OK.


Cannot restart the Atlassian Confluence service on Windows

When the Atlassian Confluence wiki is installed on a Windows server, it frequently becomes unavailable. Sometimes it is possible to restart the Atlassian Confluence Windows service, but most of the time the Stop phase times out with:

Windows could not stop the Atlassian Confluence service on Local Computer.
Error 1053: The service did not respond to the start or control request in a timely fashion.

To make Atlassian Confluence work again

  1. Open Task Manager,
  2. End the tomcat…exe process,
  3. Start the Atlassian Confluence Windows service.