apache/maven · warning

For this reason, future Maven versions might no longer suppo

Error message

For this reason, future Maven versions might no longer support building such malformed projects.

What it means

Final advisory line of the model-problem report: Maven warns that the lenient handling currently applied to the reported problems may be removed, so future Maven versions could refuse to build these projects at all. Fixed text, printed only when the aggregate problem count is greater than zero. It is the actionable escalation of the preceding 'highly recommended' line.

Source

Thrown at impl/maven-core/src/main/java/org/apache/maven/project/collector/DefaultProjectsSelector.java:96

                        result.getProjectId());

                if (request.isShowErrors()) { // this means -e or -X (as -X enables -e as well)
                    for (ModelProblem problem : result.getProblems()) {
                        String loc = ModelProblemUtils.formatLocation(problem, result.getProjectId());
                        LOGGER.warn("{}{}", problem.getMessage(), ((loc != null && !loc.isEmpty()) ? " @ " + loc : ""));
                    }
                }
            }
        }

        if (totalProblemsCount > 0) {
            LOGGER.warn("");
            LOGGER.warn("Total model problems reported: {}", totalProblemsCount);
            LOGGER.warn("");
            LOGGER.warn("It is highly recommended to fix these problems"
                    + " because they threaten the stability of your build.");
            LOGGER.warn("");
            LOGGER.warn("For this reason, future Maven versions might no"
                    + " longer support building such malformed projects.");
            LOGGER.warn("");
        }

        return projects;
    }
}

View on GitHub (pinned to e4093d4e12)

Solutions

1. Fix all problems reported with -e now, rather than waiting for the next Maven upgrade
2. Before upgrading Maven, build with the new version in CI and treat any such warning as a blocker
3. For problems originating in a consumed parent, contribute fixes upstream or override the section locally

Example fix

# before: warning ignored, build passes on Maven 3
mvn clean install

# after: rehearse the next major version and fix what it flags
mvn clean install -Dmaven.version.check=false  # (toolchain pin)
# then: install the new Maven version in CI, run the same build, fix every reported model problem

# Forward-compatibility gate: fail if Maven hints a future hard failure
mvn -e clean verify 2>&1 | tee build.log
grep -q 'future Maven versions might no longer support' build.log && { echo 'fix model problems now'; exit 1; } || true

When it happens

Trigger: Same condition as the total line: totalProblemsCount > 0 after iterating the ProjectBuildingResults of the selected projects. Any model problem, even a minor warning, produces this line.

Common situations: Projects repeatedly upgraded across Maven major versions suddenly breaking because a previously tolerated model problem (bad packaging id, missing dependency version, invalid plugin configuration) became a hard error.

Understand the failure class

• Parsing and encoding errors: unexpected token, malformed input — why parsers reject input and how to find the real culprit.

Related errors

• It is highly recommended to fix these problems because they
• lifecycle bindings injector is missing
• neither pomFile nor modelSource can be null
• request.workspaceModelResolver and request.modelResolver can
• Unable to build project

AI-assisted analysis of apache/maven@e4093d4e12 (2026-08-21). Data as JSON: /api/errors/3b794a254d661ddc. Report an issue: GitHub.