flag to disable jsonb direct writes

Author: SentryMan

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

@@ -11,7 +11,7 @@
 import javax.lang.model.element.Element;
 import javax.lang.model.element.TypeElement;
 
-@SupportedOptions({"useJavax", "useSingleton", "instrumentRequests"})
+@SupportedOptions({"useJavax", "useSingleton", "instrumentRequests","disableDirectWrites"})
 public abstract class BaseProcessor extends AbstractProcessor {
 
   @Override

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

@@ -41,6 +41,7 @@ private static final class Ctx {
     private final boolean useJavax;
     private final String diAnnotation;
     private final boolean instrumentAllMethods;
+    private final boolean disableDirectWrites;
 
     Ctx(ProcessingEnvironment env, PlatformAdapter adapter, boolean generateOpenAPI) {
       readAdapter = adapter;
@@ -57,6 +58,7 @@ private static final class Ctx {
       final var options = env.getOptions();
       final var singletonOverride = options.get("useSingleton");
       this.instrumentAllMethods = Boolean.parseBoolean(options.get("instrumentRequests"));
+      this.disableDirectWrites = Boolean.parseBoolean(options.get("disableDirectWrites"));
       if (singletonOverride != null) {
         useComponent = !Boolean.parseBoolean(singletonOverride);
       } else {
@@ -184,6 +186,10 @@ public static boolean instrumentAllWebMethods() {
     return CTX.get().instrumentAllMethods;
   }
 
+  public static boolean disabledDirectWrites() {
+    return CTX.get().disableDirectWrites;
+  }
+
   public static Filer filer() {
     return CTX.get().filer;
   }

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

@@ -1,6 +1,6 @@
 package io.avaje.http.generator.javalin;
 
-import static io.avaje.http.generator.core.ProcessingContext.platform;
+import static io.avaje.http.generator.core.ProcessingContext.*;
 
 import io.avaje.http.generator.core.Append;
 import io.avaje.http.generator.core.MethodParam;
@@ -26,7 +26,7 @@ class ControllerMethodWriter {
     this.method = method;
     this.writer = writer;
     this.webMethod = method.webMethod();
-    this.useJsonB = useJsonB;
+    this.useJsonB = useJsonB && !disabledDirectWrites();
     this.instrumentContext = method.instrumentContext();
   }
 
@@ -134,10 +134,16 @@ private void writeContextReturn(final String resultVariableName) {
     if (produces == null || MediaType.APPLICATION_JSON.getValue().equalsIgnoreCase(produces)) {
       if (useJsonB) {
         var uType = UType.parse(method.returnType());
-        if ("java.util.concurrent.CompletableFuture".equals(uType.mainType())) {
+        final boolean isfuture = "java.util.concurrent.CompletableFuture".equals(uType.mainType());
+        if (isfuture) {
           uType = uType.paramRaw();
+          writer.append("      try {");
+        }
+        writer.append("      %sJsonType.toJson(%s, ctx.contentType(\"application/json\").res().getOutputStream());",
+            uType.shortName(), resultVariableName);
+        if (isfuture) {
+          writer.append("      } catch (java.io.IOException e) { throw new java.io.UncheckedIOException(e); }");
         }
-        writer.append("      %sJsonType.toJson(%s, ctx.contentType(\"application/json\").res().getOutputStream());", uType.shortName(), resultVariableName);
       } else {
         writer.append("      ctx.json(%s);", resultVariableName);
       }

http-generator-nima/src/main/java/io/avaje/http/generator/helidon/nima/ControllerMethodWriter.java

@@ -1,5 +1,6 @@
 package io.avaje.http.generator.helidon.nima;
 
+import static io.avaje.http.generator.core.ProcessingContext.disabledDirectWrites;
 import static io.avaje.http.generator.core.ProcessingContext.platform;
 
 import java.util.List;
@@ -140,8 +141,9 @@ void writeHandler(boolean requestScoped) {
 
   private boolean producesJson() {
     return useJsonB
-      && !"byte[]".equals(method.returnType().toString())
-      && (method.produces() == null || method.produces().toLowerCase().contains("json"));
+        && !disabledDirectWrites()
+        && !"byte[]".equals(method.returnType().toString())
+        && (method.produces() == null || method.produces().toLowerCase().contains("json"));
   }
 
   private boolean missingServerResponse(List<MethodParam> params) {