apache/maven · error · IllegalArgumentException

Unrecognized entry: {}

Error message

Unrecognized entry: {}

What it means

Error "Unrecognized entry: {}" thrown in apache/maven.

Source

Thrown at compat/maven-resolver-provider/src/main/java/org/apache/maven/repository/internal/relocation/UserPropertiesArtifactRelocationSource.java:177

        String relocationsEntries = (String) session.getConfigProperties().get(CONFIG_PROP_RELOCATIONS_ENTRIES);
        if (relocationsEntries == null) {
            return null;
        }
        String[] entries = relocationsEntries.split(",");
        try (Stream<String> lines = Arrays.stream(entries)) {
            List<Relocation> relocationList = lines.filter(
                            l -> l != null && !l.trim().isEmpty())
                    .map(l -> {
                        boolean global;
                        String splitExpr;
                        if (l.contains(">>")) {
                            global = true;
                            splitExpr = ">>";
                        } else if (l.contains(">")) {
                            global = false;
                            splitExpr = ">";
                        } else {
                            throw new IllegalArgumentException("Unrecognized entry: " + l);
                        }
                        String[] parts = l.split(splitExpr);
                        if (parts.length < 1) {
                            throw new IllegalArgumentException("Unrecognized entry: " + l);
                        }
                        Artifact s = parseArtifact(parts[0]);
                        Artifact t;
                        if (parts.length > 1) {
                            t = parseArtifact(parts[1]);
                        } else {
                            t = SENTINEL;
                        }
                        return new Relocation(global, s, t);
                    })
                    .collect(Collectors.toList());
            LOGGER.info("Parsed {} user relocations", relocationList.size());
            return new Relocations(relocationList);
        }

View on GitHub (pinned to e4093d4e12)

When it happens

Trigger: Thrown at compat/maven-resolver-provider/src/main/java/org/apache/maven/repository/internal/relocation/UserPropertiesArtifactRelocationSource.java:177 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/maven@e4093d4e12 (2026-08-21). Data as JSON: /api/errors/4ae1fcd2ed351c5d. Report an issue: GitHub.