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       對應用戶(hù)自己定義的非string類(lèi)型的變量，jBPM是先將變量轉換成二進(jìn)制object 流，然后再轉換成string類(lèi)型存儲在數據庫中，取變量的過(guò)程與之相反。由于轉換成string涉及到編碼格式問(wèn)題，如GBK、ISO等，而編碼格式涉及到操作系統、數據庫、jvm等多方面的影響，jbpm目前還沒(méi)有解決這個(gè)問(wèn)題，因此在使用非string類(lèi)型變量的時(shí)候，jbpm會(huì )出錯。這個(gè)問(wèn)題tom（jbpm創(chuàng )始人）正在解決。
       這個(gè)問(wèn)題，似乎將變量按二進(jìn)制存儲更好些，這樣就不會(huì )涉及編碼格式問(wèn)題。
       另外一種方法是使用統一的編碼格式，改寫(xiě)后的org.jbpm.delegation.serializerSerializableSerializer如下：
public class SerializableSerializer implements Serializer {

    public String serialize(Object object) {
        String serialized = null;

        if (object != null) {
            if (!(object instanceof Serializable)) {
                throw new IllegalArgumentException("object ‘" + object + "‘ (" +
                        object.getClass().getName() +
                        ") cannot be serialized with " +
                        this.getClass().getName());
            }

            try {
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                ObjectOutputStream oos = new ObjectOutputStream(baos);
                oos.writeObject(object);
                oos.flush();
                baos.flush();

                serialized = baos.toString(“ISO-8859-1“);//修改

            } catch (IOException e) {
                e.printStackTrace();
                throw new RuntimeException(
                        "couldn‘t serialize state definition");
            }
        }

        return serialized;
    }

    public Object deserialize(String text) {
        Object object = null;

        if (text != null) {
            try {
                ByteArrayInputStream bais = new ByteArrayInputStream(text.
                        getBytes(“ISO-8859-1“));  //修改
                ObjectInputStream ois = new ObjectInputStream(bais);
                object = ois.readObject();
            } catch (Exception e) {
                e.printStackTrace();
                throw new RuntimeException(
                        "couldn‘t deserialize object from inputstream");
            }
        }

        return object;
    }

}