Fixed unexpected model generation bug.

light-rest-4j/src/main/java/com/networknt/codegen/rest/OpenApiGenerator.java

@@ -233,6 +233,13 @@ public void generate(String targetPath, Object model, Any config) throws IOExcep
                     String classVarName = key;
                     String modelFileName = key.substring(0, 1).toUpperCase() + key.substring(1);
                     //System.out.println("props = " + Any.wrap(props));
+
+                    // Check the type of current schema. Generation will be executed only if the type of the schema equals to object.
+                    // Since generate a model for primitive types and arrays do not make sense, and an error class would be generated
+                    // due to lack of properties if force to generate.
+                    if (!"object".equals(type)) {
+                        continue;
+                    }
                     if(!overwriteModel && checkExist(targetPath, ("src.main.java." + modelPackage).replace(".", separator), modelFileName + ".java")) {
                         continue;
                     }

light-rest-4j/src/main/resources/templates/rest/pojo.rocker.raw

@@ -1,6 +1,7 @@
 @import com.jsoniter.any.Any
 @import java.util.Map
 @import java.util.List
+@option discardLogicWhitespace=true
 
 @args (String modelPackage, String className, String classVarName, List<Map<String, Any>> props)
 package @modelPackage;
@@ -37,6 +38,7 @@ public class @className {
     }
     }
     }
+    @if(props.size() > 0) {
 
     @@Override
     public boolean equals(Object o) {
@@ -57,6 +59,7 @@ public class @className {
         return Objects.hash(@for((i, prop): props) {@if(i.index() < props.size() - 1) {@prop.get("name"),} @if(i.index() == props.size() - 1) {@prop.get("name"));}}
     }
 
+    }
     @@Override
     public String toString() {
         StringBuilder sb = new StringBuilder();