[GERONIMO-6775] ensure json examples are properly parsed in openapi

geronimo-openapi-impl/src/main/java/org/apache/geronimo/microprofile/openapi/impl/processor/SchemaProcessor.java

diff --git a/geronimo-openapi-impl/src/main/java/org/apache/geronimo/microprofile/openapi/impl/processor/SchemaProcessor.java b/geronimo-openapi-impl/src/main/java/org/apache/geronimo/microprofile/openapi/impl/processor/SchemaProcessor.java
index 5e78295..09552a3 100644
--- a/geronimo-openapi-impl/src/main/java/org/apache/geronimo/microprofile/openapi/impl/processor/SchemaProcessor.java
+++ b/geronimo-openapi-impl/src/main/java/org/apache/geronimo/microprofile/openapi/impl/processor/SchemaProcessor.java
@@ -18,11 +18,13 @@
 
 import static java.beans.Introspector.decapitalize;
 import static java.util.Arrays.asList;
+import static java.util.Collections.emptyMap;
 import static java.util.Optional.of;
 import static java.util.Optional.ofNullable;
 import static java.util.stream.Collectors.toList;
 import static java.util.stream.Collectors.toMap;
 
+import java.io.StringReader;
 import java.lang.reflect.AnnotatedElement;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
@@ -42,9 +44,12 @@
 import java.util.function.Supplier;
 import java.util.stream.Stream;
 
+import javax.json.Json;
 import javax.json.JsonArray;
 import javax.json.JsonNumber;
 import javax.json.JsonObject;
+import javax.json.JsonReader;
+import javax.json.JsonReaderFactory;
 import javax.json.JsonString;
 import javax.json.JsonValue;
 import javax.json.bind.annotation.JsonbProperty;
@@ -61,6 +66,7 @@
     private final Map<Type, org.eclipse.microprofile.openapi.models.media.Schema> cache = new HashMap<>();
     private final Map<Class<?>, String> providedRefs = new HashMap<>();
     private final Class<?> persistenceCapable;
+    private final JsonReaderFactory jsonReaderFactory;
 
     public SchemaProcessor() {
         Class<?> pc = null;
@@ -70,6 +76,7 @@
         } catch (final NoClassDefFoundError | ClassNotFoundException e) {
             // no-op
         }
+        jsonReaderFactory = Json.createReaderFactory(emptyMap());
         persistenceCapable = pc;
     }
 
@@ -381,6 +388,15 @@
                     impl.example(Integer.parseInt(example));
                 } else if (type == boolean.class || type == Boolean.class) {
                     impl.example(Boolean.parseBoolean(example));
+                } else if (type == String.class) {
+                    impl.example(example);
+                } else if ((example.startsWith("{") && example.endsWith("}")) ||
+                        (example.startsWith("[") && example.endsWith("}"))) {
+                    try (final JsonReader reader = jsonReaderFactory.createReader(new StringReader(example))) {
+                        impl.example(reader.readValue());
+                    } catch (final Exception e) {
+                        impl.example(example);
+                    }
                 } else {
                     impl.example(example);
                 }

geronimo-openapi-impl/src/test/java/org/apache/geronimo/microprofile/openapi/impl/processor/SchemaProcessorTest.java

diff --git a/geronimo-openapi-impl/src/test/java/org/apache/geronimo/microprofile/openapi/impl/processor/SchemaProcessorTest.java b/geronimo-openapi-impl/src/test/java/org/apache/geronimo/microprofile/openapi/impl/processor/SchemaProcessorTest.java
index 92c184a..2a0e1ec 100644
--- a/geronimo-openapi-impl/src/test/java/org/apache/geronimo/microprofile/openapi/impl/processor/SchemaProcessorTest.java
+++ b/geronimo-openapi-impl/src/test/java/org/apache/geronimo/microprofile/openapi/impl/processor/SchemaProcessorTest.java
@@ -45,7 +45,7 @@
         assertEquals(Schema.SchemaType.OBJECT, schema.getType());
         assertEquals("" +
                         "d=1.5 (java.lang.Double)\n" +
-                        "data={\"name\":\"ok\"} (java.lang.String)\n" +
+                        "data={\"name\":\"ok\"} (org.apache.johnzon.core.JsonObjectImpl)\n" +
                         "i=1 (java.lang.Integer)\n" +
                         "l=2 (java.lang.Integer)\n" +
                         "str=ok (java.lang.String)\n" +