Add human-readable MetasvcProblem.toString()

CHANGELOG.md

@@ -11,6 +11,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Added
 
 - The `Problem` (of error responses) is expanded by a hint that gives clearer information about the actual error
+- User-friendly Problem's `toString()`
 - The related entities of Manifestations and Works contain their name if they are `NamedEntity`s and are an instance
   of the proper derived `Entity` class
 - Add allowed media type "Object"

metasvc-model/src/main/java/de/digitalcollections/model/exception/problem/MetasvcProblem.java

@@ -4,6 +4,7 @@
 import java.net.URI;
 import java.util.Date;
 import java.util.List;
+import java.util.stream.Collectors;
 import lombok.Builder;
 import lombok.Singular;
 import org.zalando.problem.AbstractThrowableProblem;
@@ -65,4 +66,36 @@ public Date getTimestamp() {
   public ProblemHint getHint() {
     return hint;
   }
+
+  @Override
+  public String toString() {
+    StringBuilder builder = new StringBuilder();
+    builder
+        .append("MetasvcProblem {")
+        .append("title=")
+        .append(getTitle())
+        .append(", type=")
+        .append(getType())
+        .append(", status=")
+        .append(getStatus())
+        .append(", instance=")
+        .append(getInstance())
+        .append(", hint=")
+        .append(getHint())
+        .append(", detail=")
+        .append(getDetail())
+        .append(", timestamp=")
+        .append(getTimestamp())
+        .append(", errors=")
+        .append(
+            getErrors() != null
+                ? getErrors().stream()
+                    .map(ValidationError::toString)
+                    .collect(Collectors.joining(", ", "[", "]"))
+                : null)
+        .append(", parameters=")
+        .append(getParameters())
+        .append("}");
+    return builder.toString();
+  }
 }

metasvc-model/src/main/java/de/digitalcollections/model/exception/problem/ProblemHint.java

@@ -19,4 +19,9 @@ public enum ProblemHint {
   public String getDescription() {
     return description;
   }
+
+  @Override
+  public String toString() {
+    return name() + " (" + description + ")";
+  }
 }

metasvc-model/src/main/java/de/digitalcollections/model/validation/ValidationError.java

@@ -20,4 +20,9 @@ public String getFieldName() {
   public String getMessageKey() {
     return messageKey;
   }
+
+  @Override
+  public String toString() {
+    return "ValidationError {fieldName=" + fieldName + ", messageKey=" + messageKey + "}";
+  }
 }