[GitHub] [dubbo-hessian-lite] wongoo opened a new issue #38: wrong generic type for decoding

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

wongoo opened a new issue #38:
URL: https://github.com/apache/dubbo-hessian-lite/issues/38


   for type `List<Integer[]>` , the decoded type will be `List<List>`, which will cause jackson can't serialize the object, and get the error `java.util.ArrayList cannot be cast to [Ljava.lang.Object;`
   
   the following code will regenerate the error:
   ```java
   
   import com.alibaba.com.caucho.hessian.io.HessianInput;
   import com.alibaba.com.caucho.hessian.io.HessianOutput;
   import com.fasterxml.jackson.databind.ObjectMapper;
   
   import java.io.ByteArrayInputStream;
   import java.io.ByteArrayOutputStream;
   import java.io.IOException;
   import java.io.Serializable;
   import java.util.ArrayList;
   import java.util.List;
   
   public class Test {
   
       public static void main(String[] args) throws IOException {
   
           DemoData data = new DemoData();
           List<Integer[]> list = new ArrayList<>();
           list.add(new Integer[]{1, 2, 3});
           list.add(new Integer[]{4, 5, 6});
           data.setList(list);
   
           data.setInts(new Integer[]{7, 8, 9});
   
           ObjectMapper objectMapper = new ObjectMapper();
           String json = objectMapper.writeValueAsString(data);
           System.out.println(json);
   
           ByteArrayOutputStream out = new ByteArrayOutputStream();
           HessianOutput output = new HessianOutput(out);
           output.writeObject(data);
   
           ByteArrayInputStream is = new ByteArrayInputStream(out.toByteArray());
           HessianInput input = new HessianInput(is);
           Object o = input.readObject();
           System.out.println(o);
   
           json = objectMapper.writeValueAsString(o);
           System.out.println(json);
       }
   
   }
   
   class DemoData implements Serializable {
       Integer[] ints;
       List<Integer[]> list;
   
       public Integer[] getInts() {
           return ints;
       }
   
       public void setInts(Integer[] ints) {
           this.ints = ints;
       }
   
       public List<Integer[]> getList() {
           return list;
       }
   
       public void setList(List<Integer[]> list) {
           this.list = list;
       }
   }
   ```


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[GitHub] [dubbo-hessian-lite] wongoo commented on issue #38: wrong generic type for decoding

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

wongoo commented on issue #38:
URL: https://github.com/apache/dubbo-hessian-lite/issues/38#issuecomment-706861183


   <img width="336" alt="invalid_hessian_types" src="https://user-images.githubusercontent.com/4519975/95707091-296e1600-0c8b-11eb-8f27-595590bba087.png">
   


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