Repository: networknt/json-schema-validator (java)
Issue: "Unknown keyword exclusiveMinimun" when validating an OpenAPI 3.0 document
I am currently trying to validate an OpenAPI 3.0 document using the `json-schema-validator` library and I am getting the following warning when creating the `JsonSchema` object:

```
[main] WARN com.networknt.schema.UnknownKeywordFactory - Unknown keyword exclusiveMinimum - you should define your own Meta Schema. If the keyword is irrelevant for validation, just use a NonValidationKeyword or if it should generate annotations AnnotationKeyword
```

I am using this code to create the `JsonSchema` object:

```java
return JsonSchemaFactory
    .getInstance(SpecVersion.VersionFlag.V4)
    .getSchema(SchemaLocation.of("https://spec.openapis.org/oas/3.0/schema/latest"));
```

What is wrong with this and why am I getting the message printed to the console?
Pull request description: Remove warning for exclusiveMinimum and exclusiveMaximum for Draft 4
Closes #1119 

Patch:
diff --git a/src/main/java/com/networknt/schema/Version4.java b/src/main/java/com/networknt/schema/Version4.java
index 2640626..84ad713 100644
--- a/src/main/java/com/networknt/schema/Version4.java
+++ b/src/main/java/com/networknt/schema/Version4.java
@@ -26,7 +26,9 @@ public class Version4 implements JsonSchemaVersion {
                             new AnnotationKeyword("default"),
                             new NonValidationKeyword("definitions"),
                             new NonValidationKeyword("additionalItems"),
-                            new AnnotationKeyword("exampleSetFlag")
+                            new AnnotationKeyword("exampleSetFlag"),
+                            new NonValidationKeyword("exclusiveMinimum"), // exclusiveMinimum boolean handled by minimum validator
+                            new NonValidationKeyword("exclusiveMaximum")  // exclusiveMaximum boolean handled by maximum validator
                     ))
                     .build(); 
         }


Test patch:
diff --git a/src/test/java/com/networknt/schema/ExclusiveMinimumValidatorTest.java b/src/test/java/com/networknt/schema/ExclusiveMinimumValidatorTest.java
new file mode 100644
index 0000000..331bdf1
--- /dev/null
+++ b/src/test/java/com/networknt/schema/ExclusiveMinimumValidatorTest.java
@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.networknt.schema;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import java.util.Set;
+
+import org.junit.jupiter.api.Test;
+
+import com.networknt.schema.SpecVersion.VersionFlag;
+
+/**
+ * Test ExclusiveMinimumValidator validator.
+ */
+public class ExclusiveMinimumValidatorTest {
+    @Test
+    void draftV4ShouldHaveExclusiveMinimum() {
+        String schemaData = "{" +
+                "  \"type\": \"object\"," +
+                "  \"properties\": {" +
+                "    \"value1\": {" +
+                "      \"type\": \"number\"," +
+                "      \"minimum\": 0," +
+                "      \"exclusiveMinimum\": true" +
+                "    }" +
+                "  }" +
+                "}";        
+        JsonMetaSchema metaSchema = JsonMetaSchema.builder(JsonMetaSchema.getV4())
+                .unknownKeywordFactory(DisallowUnknownKeywordFactory.getInstance()).build();
+        JsonSchemaFactory factory = JsonSchemaFactory.getInstance(VersionFlag.V4,
+                builder -> builder.metaSchema(metaSchema));
+        JsonSchema schema = factory.getSchema(schemaData);
+        String inputData = "{\"value1\":0}";
+        String validData = "{\"value1\":0.1}";
+        
+        Set<ValidationMessage> messages = schema.validate(inputData, InputFormat.JSON);
+        assertEquals(1, messages.size());
+        assertEquals(1, messages.stream().filter(m -> "minimum".equals(m.getType())).count());
+        
+        messages = schema.validate(validData, InputFormat.JSON);
+        assertEquals(0, messages.size());
+    }
+
+    @Test
+    void draftV6ShouldNotAllowExclusiveMinimumBoolean() {
+        String schemaData = "{" +
+                "  \"type\": \"object\"," +
+                "  \"properties\": {" +
+                "    \"value1\": {" +
+                "      \"type\": \"number\"," +
+                "      \"minimum\": 0," +
+                "      \"exclusiveMinimum\": true" +
+                "    }" +
+                "  }" +
+                "}";
+        JsonMetaSchema metaSchema = JsonMetaSchema.builder(JsonMetaSchema.getV6())
+                .unknownKeywordFactory(DisallowUnknownKeywordFactory.getInstance()).build();
+        JsonSchemaFactory factory = JsonSchemaFactory.getInstance(VersionFlag.V6,
+                builder -> builder.metaSchema(metaSchema));
+        assertThrows(JsonSchemaException.class, () -> factory.getSchema(schemaData));
+    }
+
+    @Test
+    void draftV7ShouldNotAllowExclusiveMinimumBoolean() {
+        String schemaData = "{" +
+                "  \"type\": \"object\"," +
+                "  \"properties\": {" +
+                "    \"value1\": {" +
+                "      \"type\": \"number\"," +
+                "      \"minimum\": 0," +
+                "      \"exclusiveMinimum\": true" +
+                "    }" +
+                "  }" +
+                "}";
+        JsonMetaSchema metaSchema = JsonMetaSchema.builder(JsonMetaSchema.getV7())
+                .unknownKeywordFactory(DisallowUnknownKeywordFactory.getInstance()).build();
+        JsonSchemaFactory factory = JsonSchemaFactory.getInstance(VersionFlag.V7,
+                builder -> builder.metaSchema(metaSchema));
+        assertThrows(JsonSchemaException.class, () -> factory.getSchema(schemaData));
+    }
+}