Add ValidationException#getAllMessages() for collecting nested error messages

core/src/main/java/org/everit/json/schema/ValidationException.java

@@ -21,7 +21,6 @@
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
-import java.util.Objects;
 import java.util.stream.Collectors;
 
 import static java.util.Objects.requireNonNull;
@@ -37,6 +36,18 @@ private static int getViolationCount(final List<ValidationException> causes) {
         return Math.max(1, causeCount);
     }
 
+    private static List<String> getAllMessages(final List<ValidationException> causes) {
+        List<String> messages = causes.stream()
+                .filter(cause -> cause.causingExceptions.isEmpty())
+                .map(ValidationException::getMessage)
+                .collect(Collectors.toList());
+        messages.addAll(causes.stream()
+                .filter(cause -> !cause.causingExceptions.isEmpty())
+                .flatMap(cause -> getAllMessages(cause.getCausingExceptions()).stream())
+                .collect(Collectors.toList()));
+        return messages;
+    }
+
     /**
      * Sort of static factory method. It is used by {@link ObjectSchema} and {@link ArraySchema} to
      * create {@code ValidationException}s, handling the case of multiple violations occuring during
@@ -241,6 +252,18 @@ public List<ValidationException> getCausingExceptions() {
         return causingExceptions;
     }
 
+    /**
+     * Returns all messages collected from all violations, including nested causing exceptions.
+     * @return all messages
+     */
+    public List<String> getAllMessages() {
+        if (causingExceptions.isEmpty()) {
+            return Collections.singletonList(getMessage());
+        } else {
+            return getAllMessages(causingExceptions).stream().collect(Collectors.toList());
+        }
+    }
+
     /**
      * Returns a programmer-readable error description prepended by {@link #getPointerToViolation()
      * the pointer to the violating fragment} of the JSON document.

core/src/test/java/org/everit/json/schema/ObjectSchemaTest.java

@@ -19,11 +19,12 @@
 import nl.jqno.equalsverifier.Warning;
 import org.everit.json.schema.loader.SchemaLoader;
 import org.json.JSONObject;
-import org.json.JSONTokener;
 import org.junit.Assert;
-import org.junit.Ignore;
 import org.junit.Test;
 
+import java.util.List;
+import java.util.concurrent.Callable;
+
 import static org.junit.Assert.assertTrue;
 
 public class ObjectSchemaTest {
@@ -136,9 +137,74 @@ public void multipleViolations() {
             Assert.fail("did not throw exception for 3 schema violations");
         } catch (ValidationException e) {
             Assert.assertEquals(3, e.getCausingExceptions().size());
-            Assert.assertEquals(1, TestSupport.countCauseByJsonPointer(e, "#/numberProp"));
             Assert.assertEquals(1, TestSupport.countCauseByJsonPointer(e, "#"));
+            Assert.assertEquals(1, TestSupport.countCauseByJsonPointer(e, "#/numberProp"));
             Assert.assertEquals(1, TestSupport.countCauseByJsonPointer(e, "#/stringPatternMatch"));
+
+            List<String> messages = e.getAllMessages();
+            Assert.assertEquals(3, messages.size());
+            Assert.assertEquals(1, TestSupport.countMatchingMessage(messages, "#:"));
+            Assert.assertEquals(1, TestSupport.countMatchingMessage(messages, "#/numberProp:"));
+            Assert.assertEquals(1, TestSupport.countMatchingMessage(messages, "#/stringPatternMatch:"));
+        }
+    }
+
+    @SuppressWarnings("OptionalGetWithoutIsPresent")
+    @Test
+    public void multipleViolationsNested() throws Exception {
+        Callable<ObjectSchema.Builder> newBuilder = () -> ObjectSchema.builder()
+                .addPropertySchema("numberProp", new NumberSchema())
+                .patternProperty("^string.*", new StringSchema())
+                .addPropertySchema("boolProp", BooleanSchema.INSTANCE)
+                .addRequiredProperty("boolProp");
+
+        Schema nested2 = newBuilder.call().build();
+        Schema nested1 = newBuilder.call().addPropertySchema("nested", nested2).build();
+        Schema subject = newBuilder.call().addPropertySchema("nested", nested1).build();
+
+        try {
+            subject.validate(OBJECTS.get("multipleViolationsNested"));
+            Assert.fail("did not throw exception for 9 schema violations");
+        } catch (ValidationException subjectException) {
+            Assert.assertEquals("#: 9 schema violations found", subjectException.getMessage());
+            Assert.assertEquals(4, subjectException.getCausingExceptions().size());
+            Assert.assertEquals(1, TestSupport.countCauseByJsonPointer(subjectException, "#"));
+            Assert.assertEquals(1, TestSupport.countCauseByJsonPointer(subjectException, "#/numberProp"));
+            Assert.assertEquals(1, TestSupport.countCauseByJsonPointer(subjectException, "#/stringPatternMatch"));
+            Assert.assertEquals(1, TestSupport.countCauseByJsonPointer(subjectException, "#/nested"));
+
+            ValidationException nested1Exception = subjectException.getCausingExceptions().stream()
+                    .filter(ex -> ex.getPointerToViolation().equals("#/nested"))
+                    .findFirst()
+                    .get();
+            Assert.assertEquals("#/nested: 6 schema violations found", nested1Exception.getMessage());
+            Assert.assertEquals(4, nested1Exception.getCausingExceptions().size());
+            Assert.assertEquals(1, TestSupport.countCauseByJsonPointer(nested1Exception, "#/nested"));
+            Assert.assertEquals(1, TestSupport.countCauseByJsonPointer(nested1Exception, "#/nested/numberProp"));
+            Assert.assertEquals(1, TestSupport.countCauseByJsonPointer(nested1Exception, "#/nested/stringPatternMatch"));
+            Assert.assertEquals(1, TestSupport.countCauseByJsonPointer(nested1Exception, "#/nested/nested"));
+
+            ValidationException nested2Exception = nested1Exception.getCausingExceptions().stream()
+                    .filter(ex -> ex.getPointerToViolation().equals("#/nested/nested"))
+                    .findFirst()
+                    .get();
+            Assert.assertEquals("#/nested/nested: 3 schema violations found", nested2Exception.getMessage());
+            Assert.assertEquals(3, nested2Exception.getCausingExceptions().size());
+            Assert.assertEquals(1, TestSupport.countCauseByJsonPointer(nested2Exception, "#/nested/nested"));
+            Assert.assertEquals(1, TestSupport.countCauseByJsonPointer(nested2Exception, "#/nested/nested/numberProp"));
+            Assert.assertEquals(1, TestSupport.countCauseByJsonPointer(nested2Exception, "#/nested/nested/stringPatternMatch"));
+
+            List<String> messages = subjectException.getAllMessages();
+            Assert.assertEquals(9, messages.size());
+            Assert.assertEquals(1, TestSupport.countMatchingMessage(messages, "#:"));
+            Assert.assertEquals(1, TestSupport.countMatchingMessage(messages, "#/numberProp:"));
+            Assert.assertEquals(1, TestSupport.countMatchingMessage(messages, "#/stringPatternMatch:"));
+            Assert.assertEquals(1, TestSupport.countMatchingMessage(messages, "#/nested:"));
+            Assert.assertEquals(1, TestSupport.countMatchingMessage(messages, "#/nested/numberProp:"));
+            Assert.assertEquals(1, TestSupport.countMatchingMessage(messages, "#/nested/stringPatternMatch:"));
+            Assert.assertEquals(1, TestSupport.countMatchingMessage(messages, "#/nested/nested:"));
+            Assert.assertEquals(1, TestSupport.countMatchingMessage(messages, "#/nested/nested/numberProp:"));
+            Assert.assertEquals(1, TestSupport.countMatchingMessage(messages, "#/nested/nested/stringPatternMatch:"));
         }
     }
 

core/src/test/java/org/everit/json/schema/TestSupport.java

@@ -17,6 +17,8 @@
 
 import org.junit.Assert;
 
+import java.util.List;
+
 public class TestSupport {
 
     public static class Failure {
@@ -95,6 +97,12 @@ public static long countCauseByJsonPointer(final ValidationException root, final
                 .count();
     }
 
+    public static long countMatchingMessage(final List<String> messages, final String expectedSubstring) {
+        return messages.stream()
+                .filter(message -> message.contains(expectedSubstring))
+                .count();
+    }
+
     public static void expectFailure(final Schema failingSchema,
             final Class<? extends Schema> expectedViolatedSchemaClass,
             final String expectedPointer, final Object input) {

core/src/test/resources/org/everit/jsonvalidator/objecttestcases.json

@@ -40,6 +40,18 @@
     "numberProp": "not number",
     "stringPatternMatch": 2
   },
+  "multipleViolationsNested": {
+    "numberProp": "not number",
+    "stringPatternMatch": 2,
+    "nested": {
+      "numberProp": "not number 1",
+      "stringPatternMatch": 11,
+      "nested": {
+        "numberProp": "not number 2",
+        "stringPatternMatch": 22
+      }
+    }
+  },
   "rectangleSingleFailure": {
     "rectangle": {
       "a": -5,