support generic jsonb types

Author: SentryMan

http-generator-core/src/main/java/io/avaje/http/generator/core/JsonBUtil.java

@@ -1,8 +1,10 @@
 package io.avaje.http.generator.core;
 
+import java.util.Collection;
 import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.function.Consumer;
+import java.util.stream.Collectors;
 
 public class JsonBUtil {
   private JsonBUtil() {}
@@ -53,8 +55,20 @@ public static void writeJsonbType(UType type, Append writer) {
           writer.append("%s.class).map()", type.param1());
           break;
         default:
-          throw new UnsupportedOperationException(
-              "Only java.util Map, Set and List are supported JsonB Controller Collection Types");
+          {
+            try {
+              if (Collection.class.isAssignableFrom(Class.forName(type.mainType())))
+                throw new UnsupportedOperationException(
+                    "Only java.util Map, Set and List are supported JsonB Controller Collection Types");
+            } catch (final ClassNotFoundException e) {
+              throw new UnsupportedOperationException(
+                  "Only java.util Map, Set and List are supported JsonB Controller Collection Types");
+            }
+            final var params =
+                type.allTypes().stream().skip(1).collect(Collectors.joining(".class, ")) + ".class";
+
+            writer.append("Types.newParameterizedType(%s.class, %s))", type.mainType(), params);
+          }
       }
     }
     writer.append(";").eol();

http-generator-core/src/main/java/io/avaje/http/generator/core/UType.java

@@ -40,6 +40,12 @@ static UType parse(TypeMirror type) {
   default String param0() {
     return null;
   }
+  /**
+   * Return all types associated with this Utype.
+   */
+  default List<String> allTypes() {
+    return null;
+  }
 
   /**
    * Return the second generic parameter.
@@ -123,6 +129,11 @@ public String shortName() {
     public String mainType() {
       return rawType;
     }
+
+    @Override
+    public List<String> allTypes() {
+      return List.of(rawType);
+    }
   }
 
   /**
@@ -201,6 +212,11 @@ public String mainType() {
       return allTypes.isEmpty() ? null : allTypes.get(0);
     }
 
+    @Override
+    public List<String> allTypes() {
+      return allTypes;
+    }
+
     @Override
     public String param0() {
       return allTypes.size() < 2 ? null : allTypes.get(1);

http-generator-javalin/src/main/java/io/avaje/http/generator/javalin/ControllerWriter.java

@@ -1,10 +1,17 @@
 package io.avaje.http.generator.javalin;
 
-import io.avaje.http.generator.core.*;
-
 import java.io.IOException;
 import java.util.Map;
 
+import io.avaje.http.generator.core.BaseControllerWriter;
+import io.avaje.http.generator.core.Constants;
+import io.avaje.http.generator.core.ControllerReader;
+import io.avaje.http.generator.core.JsonBUtil;
+import io.avaje.http.generator.core.MethodReader;
+import io.avaje.http.generator.core.PrimitiveUtil;
+import io.avaje.http.generator.core.ProcessingContext;
+import io.avaje.http.generator.core.UType;
+
 /**
  * Write Javalin specific Controller WebRoute handling adapter.
  */
@@ -21,6 +28,7 @@ class ControllerWriter extends BaseControllerWriter {
     if (useJsonB) {
       reader.addImportType("io.avaje.jsonb.Jsonb");
       reader.addImportType("io.avaje.jsonb.JsonType");
+      reader.addImportType("io.avaje.jsonb.Types");
       this.jsonTypes = JsonBUtil.jsonTypes(reader);
     } else {
       this.jsonTypes = Map.of();