src/java.base/share/classes/jdk/internal/module/ModuleInfoExtender.java

*** 161,170 ****
--- 161,180 ----
       * Outputs the modified module-info.class to the given output stream.
       * Once this method has been called then the Extender object should
       * be discarded.
       */
      public void write(OutputStream out) throws IOException {
+         // emit to the output stream
+         out.write(getBytes());
+     }
+ 
+     /**
+      * Returns the bytes of the modified module-info.class.
+      * Once this method has been called then the Extender object should
+      * be discarded.
+      */
+     public byte[] getBytes() throws IOException {
          ClassWriter cw
              = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
  
          AttributeAddingClassVisitor cv
              = new AttributeAddingClassVisitor(Opcodes.ASM5, cw);
*** 195,206 ****
          cr.accept(cv, attrs.toArray(new Attribute[0]), 0);
  
          // add any attributes that didn't replace previous attributes
          cv.finish();
  
!         // emit to the output stream
!         out.write(cw.toByteArray());
      }
  
      /**
       * Returns an {@code Extender} that may be used to add additional
       * attributes to the module-info.class read from the given input
--- 205,215 ----
          cr.accept(cv, attrs.toArray(new Attribute[0]), 0);
  
          // add any attributes that didn't replace previous attributes
          cv.finish();
  
!         return cw.toByteArray();
      }
  
      /**
       * Returns an {@code Extender} that may be used to add additional
       * attributes to the module-info.class read from the given input