Java 杰克逊公司；JSONAnySetter:序列化/反序列化期间出现空指针异常

我对jackson1.9.13（和jackson2.5.0）的序列化/反序列化有一个问题，现在已经为此奋斗了几天，但没有任何成功

我的目标是使用@JsonAnyGetter&@JsonAnySetter，我想动态计算是否应该将对象写入输出。我有一个JSON定义，我用ObjectMapper序列化它（并检查是否应该包含该对象），然后我将该对象转换回字符串

为此，我使用了一个“HidableSerializer”，它在序列化过程中可以正常工作，但在将对象转换回字符串时却不行

如果没有@JsonAnySetter/-getter或“HidableSerializer”，一切都可以正常工作，但不能同时工作

为什么这不起作用？我怎样才能解决这个问题呢？欢迎采用更好的方法

堆栈跟踪如下所示：

@Override
public void resolve(SerializerProvider serializerProvider) throws JsonMappingException {
    if(defaultSerializer instanceof ResolvableSerializer) {
         ((ResolvableSerializer)defaultSerializer).resolve(serializerProvider);
    }
}

堆栈跟踪

org.codehaus.jackson.map.JsonMappingException: (was java.lang.NullPointerException) (through reference chain: ch.hasselba.Test["[anySetter]"])
null
    at org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:218)
    at org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:183)
    at org.codehaus.jackson.map.ser.std.SerializerBase.wrapAndThrow(SerializerBase.java:140)
    at org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:158)
    at org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:112)
at ch.hasselba.HidableSerializer.serialize(HidableSerializer.java:29)
    at org.codehaus.jackson.map.ser.StdSerializerProvider._serializeValue(StdSerializerProvider.java:610)
    at org.codehaus.jackson.map.ser.StdSerializerProvider.serializeValue(StdSerializerProvider.java:256)
    at org.codehaus.jackson.map.ObjectMapper._configAndWriteValue(ObjectMapper.java:2575)
    at org.codehaus.jackson.map.ObjectMapper.writeValueAsString(ObjectMapper.java:2097)
    at ch.hasselba.Demo.main(Demo.java:54)
Caused by: java.lang.NullPointerException
    at org.codehaus.jackson.map.ser.std.MapSerializer.serializeFields(MapSerializer.java:243)
    at org.codehaus.jackson.map.ser.AnyGetterWriter.getAndSerialize(AnyGetterWriter.java:41)
    at org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:154)
    ... 7 more

package ch.hasselba;

import org.codehaus.jackson.Version;
import org.codehaus.jackson.map.JsonSerializer;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;
import org.codehaus.jackson.map.introspect.BasicBeanDescription;
import org.codehaus.jackson.map.module.SimpleModule;
import org.codehaus.jackson.map.ser.BeanSerializerModifier;

public class Demo {

    public static void main(String[] args) {

        ObjectMapper mapper = new ObjectMapper();

        // register the module
        Version version = new Version(1, 0, 0, "SNAPSHOT");
        mapper.registerModule(new SimpleModule("HidableModule", version) {
            @Override
            public void setupModule(SetupContext context) {
                super.setupModule(context);
                context.addBeanSerializerModifier(new BeanSerializerModifier() {
                    @SuppressWarnings("unchecked")
                    @Override
                    public JsonSerializer<?> modifySerializer(SerializationConfig config, BasicBeanDescription desc,
                        JsonSerializer<?> serializer) {
                        if (IHidable.class.isAssignableFrom(desc.getBeanClass())) {
                            return new HidableSerializer<Object>((JsonSerializer<Object>) serializer);
                        }
                        return serializer;
                    }
                });
            }
        });

        // the data
        String content = "{ \"foo\": \"bar\" }";

        // build the Object
        Test test = null;
        try {
            test =  mapper.readValue(content, Test.class);
        } catch (Exception e) {
            e.printStackTrace();
        }

        // and now convert it back to a String
        String data = null;
        try {
             data = mapper.writeValueAsString(test);
        } catch (Exception e) {
            e.printStackTrace();
        }

        System.out.println( data );

    }

}

package ch.hasselba;


public interface IHidable {
    boolean isHidden();
}

演示代码

org.codehaus.jackson.map.JsonMappingException: (was java.lang.NullPointerException) (through reference chain: ch.hasselba.Test["[anySetter]"])
null
    at org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:218)
    at org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:183)
    at org.codehaus.jackson.map.ser.std.SerializerBase.wrapAndThrow(SerializerBase.java:140)
    at org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:158)
    at org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:112)
at ch.hasselba.HidableSerializer.serialize(HidableSerializer.java:29)
    at org.codehaus.jackson.map.ser.StdSerializerProvider._serializeValue(StdSerializerProvider.java:610)
    at org.codehaus.jackson.map.ser.StdSerializerProvider.serializeValue(StdSerializerProvider.java:256)
    at org.codehaus.jackson.map.ObjectMapper._configAndWriteValue(ObjectMapper.java:2575)
    at org.codehaus.jackson.map.ObjectMapper.writeValueAsString(ObjectMapper.java:2097)
    at ch.hasselba.Demo.main(Demo.java:54)
Caused by: java.lang.NullPointerException
    at org.codehaus.jackson.map.ser.std.MapSerializer.serializeFields(MapSerializer.java:243)
    at org.codehaus.jackson.map.ser.AnyGetterWriter.getAndSerialize(AnyGetterWriter.java:41)
    at org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:154)
    ... 7 more

package ch.hasselba;

import org.codehaus.jackson.Version;
import org.codehaus.jackson.map.JsonSerializer;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;
import org.codehaus.jackson.map.introspect.BasicBeanDescription;
import org.codehaus.jackson.map.module.SimpleModule;
import org.codehaus.jackson.map.ser.BeanSerializerModifier;

public class Demo {

    public static void main(String[] args) {

        ObjectMapper mapper = new ObjectMapper();

        // register the module
        Version version = new Version(1, 0, 0, "SNAPSHOT");
        mapper.registerModule(new SimpleModule("HidableModule", version) {
            @Override
            public void setupModule(SetupContext context) {
                super.setupModule(context);
                context.addBeanSerializerModifier(new BeanSerializerModifier() {
                    @SuppressWarnings("unchecked")
                    @Override
                    public JsonSerializer<?> modifySerializer(SerializationConfig config, BasicBeanDescription desc,
                        JsonSerializer<?> serializer) {
                        if (IHidable.class.isAssignableFrom(desc.getBeanClass())) {
                            return new HidableSerializer<Object>((JsonSerializer<Object>) serializer);
                        }
                        return serializer;
                    }
                });
            }
        });

        // the data
        String content = "{ \"foo\": \"bar\" }";

        // build the Object
        Test test = null;
        try {
            test =  mapper.readValue(content, Test.class);
        } catch (Exception e) {
            e.printStackTrace();
        }

        // and now convert it back to a String
        String data = null;
        try {
             data = mapper.writeValueAsString(test);
        } catch (Exception e) {
            e.printStackTrace();
        }

        System.out.println( data );

    }

}

package ch.hasselba;


public interface IHidable {
    boolean isHidden();
}

问题是，您在HidableSerializer中使用的defaultSerializer实例是一个（BeanSerializer），但当您在modifySerializer（）方法中将其包装到JsonSerializer（HidableSerializer）中时，它的resolve（）方法将永远不会被调用，并且无法正确初始化

如果尝试将以下行添加到HidableSerializer.serialize（）方法：

它应该会起作用

如果这对您有效，一个更持久的解决方案是让HidableSerializer实现ResolvableSerializer本身，只需将resolve（）委托给defaultSerializer，如下所示：

@Override
public void resolve(SerializerProvider serializerProvider) throws JsonMappingException {
    if(defaultSerializer instanceof ResolvableSerializer) {
         ((ResolvableSerializer)defaultSerializer).resolve(serializerProvider);
    }
}

---

我经历了调试过程，发现了一些：

它实际上实例化了在您的案例中抛出NPE的密钥序列化程序

修改HidableSerializer，它将实现以下功能：

public class HidableSerializer<T> extends JsonSerializer<T> implements ResolvableSerializer {

    private JsonSerializer<T> defaultSerializer;

    public HidableSerializer(JsonSerializer<T> serializer) {
        defaultSerializer = serializer;
    }

    @Override
    public void serialize(T value, JsonGenerator jgen, SerializerProvider provider)
        throws IOException, JsonProcessingException {

        if( value instanceof IHidable ){
            IHidable hidableValue = (IHidable) value;
            if( hidableValue.isHidden() )
                return;
        }
        defaultSerializer.serialize(value, jgen, provider);

    }

    @Override
    public void resolve(SerializerProvider provider) throws JsonMappingException {
        ((ResolvableSerializer)defaultSerializer).resolve(provider);
    }
}

公共类HidableSerializer扩展JsonSerializer实现ResolvableSerializer{
私有JsonSerializer defaultSerializer；
公共HidableSerializer（JsonSerializer序列化程序）{
defaultSerializer=序列化程序；
}
@凌驾
公共void序列化（T值、JsonGenerator jgen、SerializerProvider提供程序）
抛出IOException、JsonProcessingException{
if（IHidable的值实例）{
IHidable hidableValue=（IHidable）值；
if（hidableValue.isHidden（））
返回；
}
序列化（值，jgen，provider）；
}
@凌驾
公共无效解析（SerializerProvider提供程序）引发JsonMappingException{
（（ResolvableSerializer）defaultSerializer）。解析（提供程序）；
}
}

我已经用Jackson 2.5.0测试过了，同样的版本。我在半小时前得出了完全相同的结论（见下面的答案）：）谢谢，但正如@zeppelin所写，他的解决方案出现得稍微早了一点。