I just think you shouldn't be calling .close in your streamings at all: Can't you just do: public void write(Object dataObject, OutputStream output) throws IOException | { | if(cipher == null) | throw new IllegalStateException("Cipher is null for algo="+ this.cipherAlgorithm); | output.flush(); | | CipherOutputStream cos = new CipherOutputStream(output, cipher); | | SerializationManager sm = SerializationStreamFactory.getManagerInstance(getSerializationType() | ); | ObjectOutputStream oos = sm.createOutput(cos); | | if(wrappedMarshaller != null) | { | wrappedMarshaller.write(dataObject, oos); | } | else | { | super.write(dataObject, oos); | } | oos.flush(); | // cos.close(); pp remove this and let GC take care of these instances | // oos.close(); //There is a need to close cos | } | Take a look on the other marshallers... they always keep the streaming opened and only use flush(); View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3965297#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...