GlueGen JavaCallback: CMethodBindingEmitter: Check, describe & clear exception if occurring - we must assume async off-thread source in general

Covered by unit tests now

1 files changed, 5 insertions, 0 deletions

diff --git a/src/java/com/jogamp/gluegen/CMethodBindingEmitter.java b/src/java/com/jogamp/gluegen/CMethodBindingEmitter.java
index fc65fb4..c1b175f 100644
--- a/src/java/com/jogamp/gluegen/CMethodBindingEmitter.java
+++ b/src/java/com/jogamp/gluegen/CMethodBindingEmitter.java
@@ -409,6 +409,11 @@ public class CMethodBindingEmitter extends FunctionEmitter {
             // javaCallback.cbFuncCEmitter.emitBodyPassCArguments();
             jcbCMethodEmitter.emitJavaCallbackBodyPassJavaArguments(javaCallback, "cb->userParam");
             unit.emitln(");");
+            unit.emitln("  if( (*env)->ExceptionCheck(env) ) {");
+            unit.emitln("    fprintf(stderr, \"Info: Callback '"+jcbFriendlyBasename+"': Exception in Java Callback caught:\\n\");");
+            unit.emitln("    (*env)->ExceptionDescribe(env);");
+            unit.emitln("    (*env)->ExceptionClear(env);");
+            unit.emitln("  }");
 
             // javaCallback.cbFuncCEmitter.emitBodyUserVariableAssignments();
             // javaCallback.cbFuncCEmitter.emitBodyVariablePostCallCleanup();