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This guide shows a repeatable deployment pattern, explains static versus Manager-based deployment, and gives checks for the failures that most often produce a 404, an unreachable container, or missing classes.
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Tomcat accepts a web application either as an expanded directory hierarchy or as a packed Web Application Archive (WAR). In the default Host configuration documented for Tomcat 9, startup deployment reads applications from $CATALINA_BASE/webapps; an image can change that location, so treat the image’s configuration as authoritative. See the Tomcat deployment guide.
- Your build produces a WAR containing the application classes, resources, and deployment metadata.
- A Tomcat image supplies the servlet container and Java runtime expected by that image.
- The Dockerfile copies the WAR into the image’s actual appBase or another documented deployment directory.
docker buildcreates an image from that Dockerfile and its build context.docker run -pmaps a host port to Tomcat’s container port so a browser or API client can reach it.
The WAR filename normally determines the URL context under the default Host rules. A file named myapp.war therefore commonly becomes /myapp; the root application is a special case and may require a root-context convention or explicit context configuration. Do not test only the host name until you have confirmed the context path.
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Check the application and runtime contract first
Identify what your build actually produces
Find the project’s existing packaging instruction and verify that it creates a WAR rather than an executable JAR. Docker’s Java guide distinguishes applications that run by themselves from applications that depend on an application server; the latter should use the relevant server as the base image. The guide is at Docker’s Java language guide.
- Record the WAR filename and where the build places it, such as a project-specific output directory.
- Record the servlet and pages API level, including whether the application expects the older Java EE namespace or the newer Jakarta namespace.
- Record the Java major version required by the application and its dependencies.
- Check whether the application relies on native libraries, external configuration files, a database, or other services that the Tomcat container will not provide automatically.
The title alone does not identify your build tool or its command. Use the command already defined by the project. For a Maven project, that may be a configured package lifecycle; for a Gradle project, it may be a configured war task. Treat those as examples, not universal commands, and confirm the generated file before building the image.
Choose Tomcat by compatibility, not by the newest number
Match the Tomcat release and Java runtime to the APIs your application was compiled against. A release that is newer is not automatically a drop-in replacement when the application expects a different servlet API, pages API, or Java level.
For orientation, the Apache Tomcat 11.0.27 documentation index dated October 6, 2026 states that this line implements Servlet 6.1 and Pages 4.0. Those API levels describe Tomcat 11.0.27; they do not prove that an unspecified application is compatible with it. Check the application’s dependency declarations and the selected image’s Java requirements before choosing a tag. The version information is in the Tomcat 11.0.27 documentation index.
Verify the image’s filesystem layout
Do not assume that every Tomcat image uses the same CATALINA_HOME, CATALINA_BASE, or webapps path. The Tomcat documentation describes the default appBase, while a container image can set a different base directory, remove the default applications, or change startup behavior. Read the selected image’s documentation and confirm:
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- the complete image reference, including its tag or digest;
- the Java runtime and CPU architecture it supports;
- the value and location of the active appBase;
- the port on which Tomcat listens inside the container;
- whether startup automatically deploys WAR files copied into that directory.
Build and verify the WAR
- Run the project’s documented production build task.
- Locate the resulting WAR and note its exact case-sensitive filename.
- Inspect the archive if necessary to confirm that application classes, web resources, and required descriptors are present.
- Check that the WAR is not an executable-JAR layout intended for a different runtime.
- Copy or reference the WAR from the Docker build context. Docker can only copy files that are inside the context supplied to
docker buildand not excluded by its ignore rules.
Keep the artifact name deliberate. If the file is orders.war, users will generally test /orders. Renaming it during the Docker build changes the context path and can make a healthy deployment appear to be missing.
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Docker’s Dockerfile reference defines FROM as the base image selector and COPY as the instruction that transfers files into the image. The build overview explains that docker build evaluates the Dockerfile together with its build context. See the Dockerfile reference and Dockerfile overview.
Because the correct image tag and appBase are application-specific, this parameterized Dockerfile makes both values explicit instead of silently assuming them:
ARG TOMCAT_IMAGE
FROM ${TOMCAT_IMAGE}
ARG APPBASE
COPY myapp.war ${APPBASE}/
EXPOSE 8080Use the WAR’s real filename in the COPY source. Set TOMCAT_IMAGE to the fully qualified image reference you verified, and set APPBASE to the deployment directory documented for that image. If the image documentation confirms a conventional path such as a webapps directory below its Tomcat base, use that exact path; do not substitute a path from a different image.
EXPOSE 8080 documents an intended container port in the image. It does not make that port reachable from the host. Docker’s reference states, “The EXPOSE instruction doesn’t actually publish the port.” Port publication happens when the container is run.
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When the WAR is in a build output directory
If the artifact is not at the build-context root, either place a copy beside the Dockerfile or change the source in COPY to its relative path, for example build/libs/orders.war when that path is inside the context. Keep the destination tied to the verified appBase. A successful image build only proves that Docker copied bytes; it does not prove that Tomcat will deploy them from that directory.
Build the image
Run the build from a directory containing the Dockerfile and the WAR (or its relative output path):
docker build --build-arg TOMCAT_IMAGE="$TOMCAT_IMAGE" --build-arg APPBASE="$APPBASE" -t my-tomcat-app .Here, my-tomcat-app is an example local tag. The two shell variables should contain values you obtained from the selected image’s documentation. Docker sends the final dot as the build context; changing it changes which files are available to COPY.
Read the build output for these common signals:
- A missing-source error means the WAR is outside the context, has a different filename, or is excluded by ignore rules.
- An invalid base-image error usually means the image reference or tag is wrong, unavailable for the current architecture, or inaccessible to the Docker daemon.
- A successful build does not validate servlet compatibility; that is checked when Tomcat starts the application.
Run the container and publish Tomcat’s port
If Tomcat listens on container port 8080, a typical local run command is:
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- To use a different host port while leaving Tomcat on 8080, map it as
-p 9090:8080and browse to the host’s port 9090. - To bind only to a local interface, use Docker’s host-address form, such as
-p 127.0.0.1:8080:8080, when that fits your environment. - If another process already owns the host port, choose a free host port; changing the host port does not change Tomcat’s internal listener.
--rmremoves the stopped container, which is convenient for local testing but not a substitute for a production lifecycle policy.
Do not rely on EXPOSE alone. It is image metadata and documentation, not a host firewall rule or a port-forwarding operation.
Find the URL Tomcat deployed
Use the WAR name as the first context-path check
With default Host deployment, a WAR named myapp.war normally maps to http://localhost:8080/myapp/ after the host port is mapped to 8080. Substitute your actual host port and filename. A root deployment is handled differently, so confirm its context configuration instead of assuming a trailing application name.
Confirm deployment in container logs
Keep the container in the foreground during the first test and inspect its output. A startup message showing Tomcat initialization is not by itself proof that the application deployed; look for application deployment messages and any stack traces that follow them. If the container was started detached, inspect it with the Docker logging command and verify its running state before testing the URL.
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Test the right endpoint
A context root may return a redirect, an application landing page, or a 404 by design. Test an endpoint that the application documents, and distinguish an application-level 404 from a Tomcat-level 404. The latter often means the context was not deployed or the URL contains the wrong context path.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Static deployment versus the Manager application
There are two distinct ways to introduce an application to Tomcat. Static deployment places the WAR or expanded directory in appBase before startup. Dynamic deployment uses Tomcat’s Manager application to deploy and manage applications while the server is running. The Manager operations are described in the Tomcat Manager App How-To.
| Decision point | Static deployment in the image | Manager deployment at runtime |
|---|---|---|
| When the artifact arrives | During image construction, before the container starts. | After Tomcat is running, through Manager operations. |
| Best fit | Immutable images, repeatable releases, and a single application that should start with the container. | Controlled administration of several applications or an environment that deliberately supports runtime deployment. |
| Restart requirement | The new image is started with the application already present. | Manager can deploy without restarting Tomcat, subject to its configuration and permissions. |
| Operational concern | The image build and rollout are the deployment controls. | Administrative credentials, network exposure, authorization, and audit controls become part of the deployment surface. |
Manager is not required merely to run one WAR in a newly built container. If you expose Manager for operational reasons, restrict it to authorized administrators and avoid treating its web interface as a public application endpoint. The exact access policy depends on your environment.
A verification checklist before calling the deployment complete
- The application’s required Java and servlet/pages API levels are recorded.
- The selected Tomcat image tag or digest is compatible and documented.
- The image’s actual appBase and internal listening port are confirmed.
- The Docker build context contains the intended WAR and Dockerfile.
- The Dockerfile copies the WAR into the verified deployment directory.
- The image builds without missing-file or base-image errors.
- The run command maps a host port to the actual container listener.
- The URL uses the context path derived from the deployed WAR or configured explicitly.
- Container logs show successful application deployment without linkage or initialization errors.
Troubleshoot the failures that look alike
The container is running, but the application returns 404
- Check the URL context against the WAR filename.
myapp.waris not normally the root context. - Confirm that the WAR was copied to the image’s real appBase, not a path borrowed from another Tomcat image.
- Read the container logs for deployment failures, startup exceptions, or an application that was deliberately undeployed.
- Verify that you are testing an endpoint the application actually defines.
The host cannot connect
Confirm that the container is running and that the -p mapping uses the host port you are testing. Then verify Tomcat’s internal listener; publishing 8080 cannot reach an application configured to listen on another container port. Remember that EXPOSE alone does not publish anything.
Tomcat starts, but classes or APIs are missing
Recheck the application’s Java version, servlet/pages API target, and dependency namespace against the selected Tomcat release. A successful Docker build does not establish runtime compatibility. The documented Tomcat 11.0.27 API levels are Servlet 6.1 and Pages 4.0, but your application may target another level.
The Docker build cannot find the WAR
Check the build context shown by the final argument to docker build, the exact case of the source filename, and ignore rules that might omit the build output. If the WAR is generated outside the context, copy it into the context or invoke the build from a directory that safely contains both files.
The container exits immediately
Inspect its logs before changing the Dockerfile. An invalid image entrypoint, a failed Tomcat startup, an incompatible Java runtime, or a malformed configuration can all stop the main process. Fix the first startup error rather than adding a second process to keep the container alive.
What this basic image does not decide for production
The WAR-copy pattern answers application packaging, image construction, and local port access. It does not choose TLS termination, health checks, CPU or memory limits, persistent storage, secret injection, logging retention, image update policy, or orchestration. Those decisions depend on the deployment environment and should be specified separately.
For a production rollout, pin the tested image reference, keep the Dockerfile and application source under version control, build from a controlled context, and make the context path and port mapping part of the release configuration. If runtime administration through Manager is required, isolate and authorize it independently from the public application traffic.
Reference workflow
The shortest reliable workflow is: produce and inspect the WAR; select a compatible, documented Tomcat image; verify its appBase and listener; copy the WAR into that appBase in a Dockerfile; build the image from a context containing the artifact; run it with an explicit host-to-container port mapping; then verify logs and the WAR-derived context URL. Each of those checks guards against a different class of failure, so skipping one can leave an image that builds successfully but does not serve the application.
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