How to Deploy a WAR File in Tomcat (Step-by-Step)

What a WAR File Is

Five steps, the standard path:

1. Copy the WAR into Tomcat's webapps directory (/opt/tomcat/webapps/ or /var/lib/tomcat10/webapps/ on apt installs).
2. Wait for auto-deploy — Tomcat unpacks it within seconds and creates a context named after the file (app.war → /app).
3. Verify at http://server:8080/app and watch logs/catalina.out for the deployment line.
4. Or use the Manager UI instead: open http://server:8080/manager/html, scroll to *WAR file to deploy*, upload, and the context appears in the running list.
5. Redeploys: replace the WAR and Tomcat redeploys on change; undeploy from Manager when a context must vanish cleanly.

Running Java on your own server? The Java Tomcat hosting page and the VPS server hub cover managed and raw routes.

Option 1: Copy the WAR to webapps (Auto-Deploy)

Option 1: Copy the WAR to webapps (Auto-Deploy). Do the change this heading names on one site first, then check it in a private browser window or in the mail client, depending on the topic. Change one setting at a time, and undo it if the result is wrong before you try the next. If you want the Jaipur desk to look with you, email support@webji.services — that mailbox is staffed 24/7 in Hindi and English. Phone +91 141 4941811 is business hours only.

Option 2: Deploy via Tomcat Manager UI

On WAR file, the honest summary is that defaults matter more than brand names — a well-set budget plan outranks a mis-tuned premium one. WebJi® documents its defaults openly and adjusts them per ticket when workloads need it.

Installing Tomcat on a Linux VPS First

The clean path on Ubuntu LTS:

1. Install Java — Tomcat 10.x wants Java 11 or later (apt install openjdk-17-jdk covers Tomcat 11 too).
2. Create a dedicated user (adduser --system tomcat) rather than running the service as root.
3. Download the core tarball from tomcat.apache.org, extract to /opt/tomcat, and hand ownership to the tomcat user.
4. Create a systemd unit pointing at bin/catalina.sh run, then systemctl enable --now tomcat.
5. Open the firewall for 8080 (and 8443 if TLS) and confirm http://server:8080 shows the welcome page.

Prefer not to administer Java at all? The Java Tomcat hosting service ships Tomcat preconfigured, and any VPS server plan gives you the root box to follow these steps on.

Changing Ports and Running Behind 80/443

Allow 80 and 443 to the world, and restrict SSH (22) or RDP (3389) to known IPs. A site that times out after a firewall change is usually a closed web port, not a dead server. If you lock yourself out, use the console in the client area or email support@webji.services before you reboot in a loop.

Memory Tuning for Java Apps

Memory Tuning for Java Apps. Do the change this heading names on one site first, then check it in a private browser window or in the mail client, depending on the topic. Change one setting at a time, and undo it if the result is wrong before you try the next. If you want the Jaipur desk to look with you, email support@webji.services — that mailbox is staffed 24/7 in Hindi and English. Phone +91 141 4941811 is business hours only.

WAR Deploy Failed: Common Fixes

How this plays out with JDK: settings that look cosmetic usually decide page speed and uptime under real traffic. The defaults WebJi® ships are tuned for Indian network conditions, and support can review your setup on request.