2 files changed, 12 insertions, 2 deletions
diff --git a/src/java/com/jogamp/gluegen/JavaConfiguration.java b/src/java/com/jogamp/gluegen/JavaConfiguration.java
index 107b8c3..95e1480 100644
--- a/src/java/com/jogamp/gluegen/JavaConfiguration.java
+++ b/src/java/com/jogamp/gluegen/JavaConfiguration.java
@@ -2517,4 +2517,11 @@ public class JavaConfiguration {
   /** Mapped binding name to {@link JavaCallbackInfo} */
   /* pp */ final Map<String, JavaCallbackInfo> setFuncToJavaCallbackMap = new HashMap<String, JavaCallbackInfo>();
   final Set<String> emittedJavaCallbackUserParamClasses = new HashSet<String>();
+
+  /** Returns true if a method binding requires specific java callback code */
+  final boolean requiresJavaCallbackCode(final String bindingName) {
+      final JavaCallbackInfo jcbi = setFuncToJavaCallbackMap.get(bindingName);
+      return null != jcbi && !jcbi.cbUserParamIsDefined;
+  }
+
 }
diff --git a/src/java/com/jogamp/gluegen/JavaEmitter.java b/src/java/com/jogamp/gluegen/JavaEmitter.java
index 0936536..1f1f8af 100644
--- a/src/java/com/jogamp/gluegen/JavaEmitter.java
+++ b/src/java/com/jogamp/gluegen/JavaEmitter.java
@@ -465,9 +465,11 @@ public class JavaEmitter implements GlueEmitter {
       final boolean isUnimplemented = cfg.isUnimplemented(cSymbol);
       final List<String> prologue = cfg.javaPrologueForMethod(binding, false, false);
       final List<String> epilogue = cfg.javaEpilogueForMethod(binding, false, false);
+      final boolean needsJavaCallbackCode = cfg.requiresJavaCallbackCode( binding.getName() );
       final boolean needsBody = isUnimplemented ||
                                 binding.needsNIOWrappingOrUnwrapping() ||
                                 binding.signatureUsesJavaPrimitiveArrays() ||
+                                needsJavaCallbackCode ||
                                 null != prologue  ||
                                 null != epilogue;
 
@@ -531,6 +533,7 @@ public class JavaEmitter implements GlueEmitter {
       final boolean hasPrologueOrEpilogue =
               cfg.javaPrologueForMethod(binding, false, false) != null ||
               cfg.javaEpilogueForMethod(binding, false, false) != null ;
+      final boolean needsJavaCallbackCode = cfg.requiresJavaCallbackCode( binding.getName() );
 
       if ( !cfg.isUnimplemented( cSymbol ) ) {
           // If we already generated a public native entry point for this
@@ -541,7 +544,7 @@ public class JavaEmitter implements GlueEmitter {
           //   the private native entry point for it along with the version
           //   taking only NIO buffers
           if ( !binding.signatureUsesJavaPrimitiveArrays() &&
-               ( binding.needsNIOWrappingOrUnwrapping() || hasPrologueOrEpilogue )
+               ( binding.needsNIOWrappingOrUnwrapping() || hasPrologueOrEpilogue || needsJavaCallbackCode )
              )
           {
               final CodeUnit unit = (cfg.allStatic() ? javaUnit() : javaImplUnit());
@@ -588,7 +591,7 @@ public class JavaEmitter implements GlueEmitter {
                               cfg.implClassName(),
                               true, // NOTE: we always disambiguate with a suffix now, so this is optional
                               cfg.allStatic(),
-                              (binding.needsNIOWrappingOrUnwrapping() || hasPrologueOrEpilogue ),
+                              (binding.needsNIOWrappingOrUnwrapping() || hasPrologueOrEpilogue || needsJavaCallbackCode),
                               !cfg.useNIODirectOnly(binding.getName()),
                               machDescJava, getConfig());
               prepCEmitter(binding.getName(), binding.getJavaReturnType(), cEmitter);