HHH-10112 - [enhancer] Use loading classloader in ClassPool

(cherry picked from commit 3f2c785)

Author: barreiro

hibernate-core/src/main/java/org/hibernate/bytecode/enhance/spi/Enhancer.java

@@ -93,8 +93,14 @@ public synchronized byte[] enhance(String className, byte[] originalBytes) throw
 		}
 	}
 
-	private ClassPool buildClassPool(EnhancementContext enhancementContext) {
-		final ClassPool classPool = new ClassPool( false );
+	private ClassPool buildClassPool(final EnhancementContext enhancementContext) {
+		final ClassPool classPool = new ClassPool( false ) {
+			@Override
+			public ClassLoader getClassLoader() {
+				return enhancementContext.getLoadingClassLoader();
+			}
+		};
+
 		final ClassLoader loadingClassLoader = enhancementContext.getLoadingClassLoader();
 		if ( loadingClassLoader != null ) {
 			classPool.appendClassPath( new LoaderClassPath( loadingClassLoader ) );