[Bug] 泛型字段 deserializeUsing 失效

fastjson/src/main/java/com/alibaba/fastjson/parser/deserializer/DefaultFieldDeserializer.java

Lines 53 to 69 in 9b8b186

    
           public void parseField(DefaultJSONParser parser, Object object, Type objectType, Map<String, Object> fieldValues) { 
        
               if (this.fieldValueDeserilizer == null) { 
        
                   getFieldValueDeserilizer(parser.getConfig()); 
        
               } 
        
               ObjectDeserializer fieldValueDeserilizer = this.fieldValueDeserilizer; 
        
               Type fieldType = fieldInfo.fieldType; 
        
               if (objectType instanceof ParameterizedType) { 
        
                   ParseContext objContext = parser.getContext(); 
        
                   if (objContext != null) { 
        
                       objContext.type = objectType; 
        
                   } 
        
                   if (fieldType != objectType) { 
        
                       fieldType = FieldInfo.getFieldType(this.clazz, objectType, fieldType); 
        
                       fieldValueDeserilizer = parser.getConfig().getDeserializer(fieldType); 
        
                   } 
        
               }

58 行可能通过 deserializeUsing 注解获取过字段上的 Codec , 在 67 行不应该暴力覆盖. 需要判断下当前是否有值,如果为 null 在覆盖.

用例同
#3008

public class OfficeBean<T> {
    @JSONField(name = "Preference", deserializeUsing = PreferenceDeserializer.class)
    private T preferenceBean;
}

Add testcase for 'deserializeUsing' on generic field, alibaba#3693

Fix 'deserializeUsing' on generic field not work, issue alibaba#3693

该问题的修复带来了新的bug：#3810

Merge pull request alibaba#3697 from timandy/fix-deserializeUsing-on-…

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[Bug] 泛型字段 deserializeUsing 失效 #3693

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	public void parseField(DefaultJSONParser parser, Object object, Type objectType, Map<String, Object> fieldValues) {
	if (this.fieldValueDeserilizer == null) {
	getFieldValueDeserilizer(parser.getConfig());
	}

	ObjectDeserializer fieldValueDeserilizer = this.fieldValueDeserilizer;
	Type fieldType = fieldInfo.fieldType;
	if (objectType instanceof ParameterizedType) {
	ParseContext objContext = parser.getContext();
	if (objContext != null) {
	objContext.type = objectType;
	}
	if (fieldType != objectType) {
	fieldType = FieldInfo.getFieldType(this.clazz, objectType, fieldType);
	fieldValueDeserilizer = parser.getConfig().getDeserializer(fieldType);
	}
	}

[Bug] 泛型字段 deserializeUsing 失效 #3693

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darren-wang commented on Jun 15, 2021

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