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Improve error message for unresolved expressions #11615

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Improve error message for unresolved expressions #11615

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58 changes: 57 additions & 1 deletion impl/maven-impl/src/main/java/org/apache/maven/impl/DefaultDependencyResolver.java
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Original file line number Diff line number Diff line change
Expand Up @@ -174,7 +174,8 @@ public DependencyResolverResult collect(@Nonnull DependencyResolverRequest reque
session.getNode(result.getRoot(), request.getVerbose()),
0);
} catch (DependencyCollectionException e) {
throw new DependencyResolverException("Unable to collect dependencies", e);
String enhancedMessage = enhanceCollectionError(e, collectRequest);
throw new DependencyResolverException(enhancedMessage, e);
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@Pankraz76 Pankraz76 Jan 8, 2026

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Suggested change
throw new DependencyResolverException(enhancedMessage, e);
throw new DependencyResolverException(enhanceCollectionError(e, collectRequest), e);

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@elharo elharo Jan 12, 2026

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I think this is fine as is

}
} finally {
RequestTraceHelper.exit(trace);
Expand Down Expand Up @@ -274,4 +275,59 @@ public DependencyResolverResult resolve(DependencyResolverRequest request)
private static DependencyResolverException cannotReadModuleInfo(final Path path, final IOException cause) {
return new DependencyResolverException("Cannot read module information of " + path, cause);
}

private static boolean containsUnresolvedExpression(String value) {
return value != null && value.contains("${") && value.contains("}");
}

private static String enhanceCollectionError(DependencyCollectionException e, CollectRequest request) {
if (e.getMessage() != null && e.getMessage().contains("Invalid Collect Request")) {
StringBuilder enhanced = new StringBuilder();
enhanced.append("Failed to collect dependencies");

org.eclipse.aether.graph.Dependency root = request.getRoot();
if (root != null && root.getArtifact() != null) {
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@Pankraz76 Pankraz76 Jan 8, 2026

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Suggested change
if (root != null && root.getArtifact() != null) {
return if (root != null && root.getArtifact() != null) ? enhanceDependency() : enhanceDependencies(...);

could be extracted as dedicated branch/concern to provide cohesion over coupling.

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@elharo elharo Jan 12, 2026

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ternary operators are harder to read

org.eclipse.aether.artifact.Artifact artifact = root.getArtifact();
String groupId = artifact.getGroupId();
String artifactId = artifact.getArtifactId();
String version = artifact.getVersion();

if (containsUnresolvedExpression(groupId) || containsUnresolvedExpression(artifactId)
|| containsUnresolvedExpression(version)) {
enhanced.append(" due to unresolved expression(s) in dependency: ")
.append(groupId)
.append(":")
.append(artifactId)
.append(":")
.append(version)
.append(".\n")
.append("Please check that all properties are defined in your POM or settings.xml.");
return enhanced.toString();
}
}

for (org.eclipse.aether.graph.Dependency dep : request.getDependencies()) {
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@Pankraz76 Pankraz76 Jan 8, 2026

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could be extracted as dedicated branch/concern to provide cohesion over coupling.

Suggested change
for (org.eclipse.aether.graph.Dependency dep : request.getDependencies()) {
return enhanceDependencies(...)

if (dep != null && dep.getArtifact() != null) {
org.eclipse.aether.artifact.Artifact artifact = dep.getArtifact();
String groupId = artifact.getGroupId();
String artifactId = artifact.getArtifactId();
String version = artifact.getVersion();

if (containsUnresolvedExpression(groupId) || containsUnresolvedExpression(artifactId)
|| containsUnresolvedExpression(version)) {
enhanced.append(" due to unresolved expression(s) in dependency: ")
.append(groupId)
.append(":")
.append(artifactId)
.append(":")
.append(version)
.append(".\n")
.append("Please check that all properties are defined in your POM or settings.xml.");
return enhanced.toString();
}
}
}
}
return e.getMessage();
}
}
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