Improve error message

Signed-off-by: Francis Galiegue <[email protected]>

Author: fge

src/main/java/com/github/fge/jsonschema/processors/validation/InstanceValidator.java

@@ -21,7 +21,6 @@
 
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.node.ArrayNode;
-import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.github.fge.jackson.JacksonUtils;
 import com.github.fge.jackson.jsonpointer.JsonPointer;
 import com.github.fge.jsonschema.core.exceptions.InvalidSchemaException;
@@ -36,12 +35,16 @@
 import com.github.fge.jsonschema.processors.data.SchemaContext;
 import com.github.fge.jsonschema.processors.data.ValidatorList;
 import com.github.fge.msgsimple.bundle.MessageBundle;
+import com.github.fge.uritemplate.URITemplate;
+import com.github.fge.uritemplate.URITemplateException;
+import com.github.fge.uritemplate.vars.VariableMap;
 import com.google.common.base.Equivalence;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Sets;
 
 import javax.annotation.ParametersAreNonnullByDefault;
 import javax.annotation.concurrent.NotThreadSafe;
+import java.net.URI;
 import java.util.Collections;
 import java.util.List;
 import java.util.Set;
@@ -230,10 +233,16 @@ public String toString()
 
     private static JsonNode toJson(final FullData data)
     {
-        final ObjectNode node = JacksonUtils.nodeFactory().objectNode();
-        node.put("schema", data.getSchema().asJson());
-        node.put("instance", data.getInstance().asJson());
-        return node;
+        final SchemaTree tree = data.getSchema();
+        final URI baseUri = tree.getLoadingRef().getLocator();
+        try {
+            final URITemplate template = new URITemplate(baseUri + "{+ptr}");
+            final VariableMap vars = VariableMap.newBuilder().addScalarValue(
+                "ptr", tree.getPointer()).freeze();
+            return JacksonUtils.nodeFactory().textNode(template.toString(vars));
+        } catch (URITemplateException e) {
+            throw new IllegalStateException("wtf??", e);
+        }
     }
 
     @ParametersAreNonnullByDefault

src/main/resources/com/github/fge/jsonschema/validator/validation.properties

@@ -78,4 +78,5 @@ err.format.UUID.invalid = input string "%s" is not a valid UUID
 #
 # Other messages
 #
-err.common.validationLoop = validation loop detected
+err.common.validationLoop = validation loop: same schema visited more than \
+  once for the same instance