`putFields` field gets overwritten for every field

[Piotrek Żygieło]

orb/orbmain/src/main/java/com/sun/corba/ee/impl/io/OutputStreamHook.java

Lines 145 to 150 in 08d26c2

 @Override 
 public ObjectOutputStream.PutField putFields() 
     throws IOException { 
     putFields = new HookPutFields(); 
     return putFields; 
 } 

Thus - if class defines few fields AND in its writeObject methods registers each one with separate outStream.putFields().put(...) - like ConcurrentHashMap (JDK8) does:
https://github.com/openjdk/jdk/blob/9a9add8825a040565051a09010b29b099c2e7d49/jdk/src/share/classes/java/util/concurrent/ConcurrentHashMap.java#L1403-L1405
then only one field is serialized with value, and the remaining are serialized as nulls in (example for int):

orb/orbmain/src/main/java/com/sun/corba/ee/impl/io/IIOPOutputStream.java

Lines 668 to 674 in 08d26c2

 case 'I': 
     if (value == null) { 
         orbStream.write_long(0); 
     } else { 
         orbStream.write_long(((Integer) value).intValue()); 
     } 
     break; 

But due to putFields being overwritten - fields at

orb/orbmain/src/main/java/com/sun/corba/ee/impl/io/OutputStreamHook.java

Line 120 in 08d26c2

 Object value = fields.get(osfields[i].getName()); 

is new, one-element only map, for every new field put to the stream.

[Piotrek Żygieło]

JDK-8075802