[GitHub] [dubbo-hessian-lite] xuyanhua opened a new issue #45: com.alibaba.com.caucho.hessian.io.HessianProtocolException: com.alibaba.com.caucho.hessian.io.ObjectDeserializer: unexpected object java.lang.String (2)

[GitBox <gi...@apache.org>]

xuyanhua opened a new issue #45:
URL: https://github.com/apache/dubbo-hessian-lite/issues/45


   我们使用dubbo的时候，返回的结果对象是这样的
   class Result <T>{
       int code;//错误码
       String message;//错误消息
       T module ;//保存数据
   }
   但是调用时报反序列失败，报错如下：
   `Exception in thread "main" com.alibaba.com.caucho.hessian.io.HessianFieldException: AVX$Result.data: com.alibaba.com.caucho.hessian.io.ObjectDeserializer: unexpected object java.lang.String (2)
   	at com.alibaba.com.caucho.hessian.io.JavaDeserializer.logDeserializeError(JavaDeserializer.java:163)
   	at com.alibaba.com.caucho.hessian.io.JavaDeserializer$ObjectFieldDeserializer.deserialize(JavaDeserializer.java:394)
   	at com.alibaba.com.caucho.hessian.io.JavaDeserializer.readObject(JavaDeserializer.java:269)
   	at com.alibaba.com.caucho.hessian.io.JavaDeserializer.readObject(JavaDeserializer.java:196)
   	at com.alibaba.com.caucho.hessian.io.SerializerFactory.readObject(SerializerFactory.java:527)
   	at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObjectInstance(Hessian2Input.java:2743)
   	at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2683)
   	at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2657)
   	at AVX.deserialize(AVX.java:37)
   	at AVX.main(AVX.java:18)
   Caused by: com.alibaba.com.caucho.hessian.io.HessianProtocolException: com.alibaba.com.caucho.hessian.io.ObjectDeserializer: unexpected object java.lang.String (2)
   	at com.alibaba.com.caucho.hessian.io.AbstractDeserializer.error(AbstractDeserializer.java:101)
   	at com.alibaba.com.caucho.hessian.io.AbstractDeserializer.readMap(AbstractDeserializer.java:90)
   	at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2066)
   	at com.alibaba.com.caucho.hessian.io.JavaDeserializer$ObjectFieldDeserializer.deserialize(JavaDeserializer.java:390)
   	... 8 more
   `
   
   代码如下：
   
   `
   import com.alibaba.com.caucho.hessian.io.Hessian2Input;
   import com.alibaba.com.caucho.hessian.io.Hessian2Output;
   
   import java.io.ByteArrayInputStream;
   import java.io.ByteArrayOutputStream;
   import java.io.IOException;
   import java.io.Serializable;
   import java.util.HashMap;
   
   public class AVX {
       public static void main(String[] args) throws IOException, ClassNotFoundException {
           HashMap<String, String> map = new HashMap<>();
           map.put("2", "2");
   
           Result<HashMap<String, String>> test = new Result(map);
           byte[] bytes = serialize(test);
   
           Result<HashMap<String, String>> mm = (Result<HashMap<String, String>>) deserialize(bytes);
           System.out.println(mm);
       }
   
       public static byte[] serialize(Object obj) throws IOException {
           if (obj == null) throw new NullPointerException();
   
           ByteArrayOutputStream os = new ByteArrayOutputStream();
           Hessian2Output ho = new Hessian2Output(os);
           ho.writeObject(obj);
           ho.flushBuffer();
           return os.toByteArray();
       }
   
       public static Object deserialize(byte[] by) throws IOException {
           if (by == null) throw new NullPointerException();
   
           ByteArrayInputStream is = new ByteArrayInputStream(by);
           Hessian2Input hi = new Hessian2Input(is);
           return hi.readObject();
       }
   
       static class Result<T extends Serializable> implements Serializable {
   
           public Result(T data) {
               this.data = data;
           }
   
           private T data;
   
           public T getData() {
               return data;
           }
   
           public void setData(T data) {
               this.data = data;
           }
   
           @Override
           public String toString() {
               return "Result{" +
                       "data=" + data +
                       '}';
           }
       }
   }`
   
   经过测试，如果
   `static class Result<T extends Serializable> implements Serializable {`
   改为
   `static class Result<T> implements Serializable {`
   
   则能正常反序列化出来。
   
   求大神帮助 看看


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