![]() ![]() If there is a change to any of the class files in this directory, then JRebel will update the classes in the container’s JVM to reflect those changes. In Maven, this is the target/classes/ directory of your Java project. JRebel works by monitoring the directory that contains the class files that are produced as part of a build. In order to enable developers to be more productive, we decided to try using JRebel, a tool created by ZeroTurnaround that allows developers to see the effect of their code changes immediately. It is important to get quick feedback when working in order to maintain flow and productivity, and this wait time clearly violates that principle. This means that after a developer makes a change to the code, they must wait at least this long (in addition to the amount of time that it takes to get to the correct context in the application to test the change that they are going to make) to see whether the changes that they made achieved the desired result. This application server takes about 1.5 minutes to start. Once the app is deployed, any changes you make in the IDE should now be reflected in the server running in the docker container.On our current project, we are using a JBoss application server to host the services that the application needs to function. Click on “Continue”, “Apply”, and then “OK”. ![]() Click on “Add” and enter the URL of the application, it will be something like “.In the dialog that pops up, click on “Edit” button next to the “Deployment URLs” text box.Right-click on your project again, select JRebel -> Advanced Properties.Right-click on your project again, select JRebel -> Enable remote server support.In Eclipse, right-click on your project, select JRebel -> Add JRebel Nature.You can do that by following these instructions. Configure the IDEįinally we need to configure Eclipse to work with the Tomcat server that we have running in docker. ![]() Of course you can combine these 2 steps for creating a custom image into 1, by creating your own Tomcat image from scratch instead of using the ‘official’ Tomcat image as a base. 10:38:40 JRebel: Server is running with JRebel Remoting. 10:38:40 JRebel: at least 0 redeploys/restarts saving you about 0 hours. 10:38:40 JRebel: Over the last 1 days JRebel prevented 10:38:40 JRebel: (c) Copyright ZeroTurnaround AS, Estonia, Tartu. We should be able to see the JRebel version and licensing information. We can verify that the JRebel configuration has been included in Tomcat by checking the startup logs. ĭocker run -i -t -d -name mytomcat -p 8080:8080 your_repository/tomcat-jrebel if you want to add your list of users, then copy the your version of tomcat-users.xml to the Tomcat config directory by adding this line to the Dockerfile:ĪDD tomcat-users.xml /usr/local/tomcat/conf/Ģ.3 Build and run the customized Tomcat server (using your own repository name, image name and container name to replace the values in this example).ĭocker build -t your_repository/tomcat-jrebel. You can use a different directory, as long as the -javaagent configuration can find it.Īlso you can take this opportunity to do further customizations on the Tomcat server, e.g. Note that for simplicity, I have just added the JRebel agent to the directory /jrebel. So what we want to do is to create a custom docker image, based on the Tomcat image, which incorporates the JRebel configuration.Ģ.1 Create an empty directory and copy the JRebel agent jrebel.jar to it.Ģ.2 Create a Dockerfile to build your custom Tomcat image, for example: There are generic instructions on JRebel remoting, which we can adapt to do it in a docker environment. Since we are using docker to run the application server, then we will need to run JRebel in remote mode. You can find the list in the Tomcat docker repository:Ģ. Here xxx is the specific version of Tomcat you want to use as the base image, e.g. Get the base Tomcat docker image from the docker hub. (Note that for Tomcat 8, please use the legacy version of jrebel.jar which is found in the lib sub-directory of the zip archive.) Install JRebel in the Application Serverġ. You can either get this from the JRebel plugin you have just installed into Eclipse (look for the section titled ‘Where do I find jrebel.jar?’) We need the JRebel agent (jrebel.jar) to install into Tomcat. For Eclipse, follow these instructions just to install and activate JRebel for the IDE:Ģ. I’m using the Eclipse IDE, but there are instructions on the ZeroTurnaround website on using a different IDE or for installing it standalone.ġ.
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