Make error message deterministic by sorting rule names

1 files changed, 7 insertions, 3 deletions

diff --git a/config-model/src/main/java/com/yahoo/vespa/model/container/search/SemanticRuleBuilder.java b/config-model/src/main/java/com/yahoo/vespa/model/container/search/SemanticRuleBuilder.java
index b184861c102..4a295d49a32 100644
--- a/config-model/src/main/java/com/yahoo/vespa/model/container/search/SemanticRuleBuilder.java
+++ b/config-model/src/main/java/com/yahoo/vespa/model/container/search/SemanticRuleBuilder.java
@@ -12,7 +12,9 @@ import com.yahoo.prelude.semantics.parser.ParseException;
 
 import java.io.File;
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
 /**
@@ -60,9 +62,11 @@ public class SemanticRuleBuilder {
     private void ensureZeroOrOneDefaultRule(SemanticRulesConfig config) {
         String defaultName = null;
         for (SemanticRulesConfig.Rulebase ruleBase : config.rulebase()) {
-            if (defaultName != null && ruleBase.isdefault())
-                throw new IllegalArgumentException("Both '" + defaultName + "' and '" + ruleBase.name() +
-                                                    "' is marked as default rule, there can only be one");
+            if (defaultName != null && ruleBase.isdefault()) {
+                List<String> defaultRules = new ArrayList<>(List.of(defaultName, ruleBase.name()));
+                defaultRules.sort(String::compareTo);
+                throw new IllegalArgumentException("Rules " + defaultRules + " are both marked as the default rule, there can only be one");
+            }
             if (ruleBase.isdefault())
                 defaultName = ruleBase.name();
         }