Spring Boot Tomcat 8

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By default, Spring Boot uses Tomcat 7. If you want to use Tomcat 8, just say so! You need only override the Maven build’s tomcat.version property and this will trigger the resolution of later. Deploy a Spring Boot application which was implemented using Spring Boot 2.x on WebSphere Application Server 8.5.5 with NO changes to server-level configurations. Modify application-level class.

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Learn How to Configure Embedded Tomcat Server in a Spring Boot Application.

Overview

Spring Boot ships with an Embedded Tomcat Server. When we run a Spring Boot Application, the embedded tomcat server is started and the application is launched inside the server. The Embedded tomcat server has a set of default configurations, which makes them ready to use. However, we can use the properties or yaml files to configure embedded tomcat server and change the default settings.

We will start with the most basic Tomcat configurations like server address and port. Then, we will move to enable and change the servers access logs setting. Next, we will change the error handling and server connections behaviour. Finally, we will configure the SSL Settings of the embedded server.

Modify Address and Port

Next example shows, how to configure server address and port number. The tomcat by default, listens on the port 8080 and the network address of 0.0.0.0.

In most of the cases, we may want to change the port number of the Tomcat and there are more than one way of doing that. To learn them visit our article Change Default Port in Spring Boot Application.

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Enable and Configure Tomcat Access Logs

The access logs are by default disabled in tomcat. We can enable them using the next configuration.

The next section shows how to configure some of the common properties of the access logs.

To Change the access log directory:

Or, to change the prefix and suffix appended with the access log file names:

Similarly we can also change the date format which is used in the access log file names:

By default, tomcat keeps the access logs forever. However, we can change this and provide the number of days, we want the logs to be retained.

Configure Tomcat Error Handling

Tomcat has a default mechanism to display a generic error page when a the server throws exception. We can disable this error page by setting this.

Using the next set of properties, we can control what information about the error is displayed on the error page.

In the next example, we are allowing the Exception to be displayed on the error page, however hiding the display of complete exception stack trace. We are also allowing the error message to be displayed on the page.

Configure Tomcat Server Connections

The server handles a number of concurrent requests by using its in-build thread pooling mechanism. However, for the effective and optimal use of the available resources like memory and CPU we can set the maximum number of concurrent threads the server creates. If not set, the value defaults to 200 threads.

Moreover, we can also specify how Minimum number of Threads should always remain in the pool, which is 10 by default.

Once a client makes a connection with the server, the server waits for the request to be complete. We can specify the Tomcat Server Connection Timeout value. After the timeout value is exceeded, the server will close the client connection.

We can also control the size of the requests reaching to the server. Let’s see them one by one.

We can Set Maximum Http Header Size

And, we can Set Maximum Http Request Size. This is the

Also, we can Set Maximum Post Request size.

Configure SSL

We will have a look at How to Configure SSL in a Spring Boot Application.

Enable the Tomcat SSL `

Configure the SSL Protocol

An alias is used to identify the key in key store. We can specify the alias using the next property. If we do not specify it, the first key in the key store is used.

We can set the certificate key store path, key store type, key store provider, and key store password like this.

The client certificates are validated using a trust store. The trust store properties can be provided like this. These properties include trust store path, trust store type, trust store provider, and the trust store password.

Summary

In this quick tutorial we covered various ways of Configuring Embedded Tomcat Server in a Spring Boot Application. We learned to configure tomcat address, and port, enable and configure Tomcat Access logs, Configure and Change the default Error Handling, Configure the Tomcat Connection properties, and finally we learned to Configure Tomcat SSL properties.

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By using Spring Boot application, we can create a war file to deploy into the web server. In this chapter, you are going to learn how to create a WAR file and deploy the Spring Boot application in Tomcat web server.

Spring Boot Servlet Initializer

The traditional way of deployment is making the Spring Boot Application @SpringBootApplication class extend the SpringBootServletInitializer class. Spring Boot Servlet Initializer class file allows you to configure the application when it is launched by using Servlet Container.

The code for Spring Boot Application class file for JAR file deployment is given below −

We need to extend the class SpringBootServletInitializer to support WAR file deployment. The code of Spring Boot Application class file is given below −

Setting Main Class

Spring Boot 2 Tomcat Config

In Spring Boot, we need to mention the main class that should start in the build file. For this purpose, you can use the following pieces of code −

For Maven, add the start class in pom.xml properties as shown below −

For Gradle, add the main class name in build.gradle as shown below −

Boot

Update packaging JAR into WAR

We have to update the packaging JAR into WAR using the following pieces of code −

Spring Boot Tomcat 8 Software

For Maven, add the packaging as WAR in pom.xml as shown below −

Spring Boot Tomcat Configuration

For Gradle, add the application plugin and war plugin in the build.gradle as shown below −

Now, let us write a simple Rest Endpoint to return the string “Hello World from Tomcat”. To write a Rest Endpoint, we need to add the Spring Boot web starter dependency into our build file.

For Maven, add the Spring Boot starter dependency in pom.xml using the code as shown below −

For Gradle, add the Spring Boot starter dependency in build.gradle using the code as shown below −

Now, write a simple Rest Endpoint in Spring Boot Application class file using the code as shown below −

Packaging your Application

Now, create a WAR file to deploy into the Tomcat server by using Maven and Gradle commands for packaging your application as given below −

For Maven, use the command mvn package for packaging your application. Then, the WAR file will be created and you can find it in the target directory as shown in the screenshots given below −

For Gradle, use the command gradle clean build for packaging your application. Then, your WAR file will be created and you can find it under build/libs directory. Observe the screenshots given here for a better understanding −

Deploy into Tomcat

Now, run the Tomcat Server, and deploy the WAR file under the webapps directory. Observe the screenshots shown here for a better understanding −

Spring

After successful deployment, hit the URL in your web browser http://localhost:8080/demo-0.0.1-SNAPSHOT/ and observe that the output will look as shown in the screenshot given below −

The full code for this purpose is given below.

Spring Boot Tomcat 8.5

pom.xml

build.gradle

The code for main Spring Boot application class file is given below −