JodaTime LocalTime 到 JSON - 实际堆栈

Question

我正在尝试将 Java 个对象序列化为 JSON。我的一个 Java 对象将 JodaTime LocalTime 对象作为其字段之一。

我的相当多的 Java 对象也有各种 Collection 可能为空的字段。我想阻止看起来像这样的 JSON 的序列化：

{id: 2348904, listOfThings: [], listOfStuff: [], nowASet: []}

在这三个 Collection 为空的情况下，我宁愿看到这个 JSON:

{id: 2348904}

做这样的事情的正确方法是用下面的代码行配置ObjectMapper：

objectMapper.setSerializationInclusion(Include.NON_EMPTY);

这工作得很好......直到我用里面的 LocalTime 击中那个 Java 对象。那是我得到实际 java.lang.WhosebugError.

的时候

好像在JodaDateSerializerBase.isEmpty()和JsonSerializer.isEmpty()之间打乒乓球。不过，我不确定是怎么回事，因为他们不互相打电话。

我设法制作了一个 SSSSSSCCCCEEEE，或者不管是什么首字母缩略词，如下所示：

package whatever.you.like;

import com.fasterxml.jackson.annotation.JsonInclude.Include;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.datatype.joda.JodaModule;
import org.joda.time.LocalTime;
import org.junit.Test;

public class TestClass {
  public class JodaMapper extends ObjectMapper {
    private static final long serialVersionUID = 34785437895L;

    public JodaMapper() {
      registerModule(new JodaModule());
    }

    public boolean getWriteDatesAsTimestamps() {
      return getSerializationConfig().isEnabled(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    }

    public void setWriteDatesAsTimestamps(boolean state) {
      configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, state);
    }
  }

  private class Thing {
    private LocalTime localTime;

    public Thing() {}

    public void setLocalTime(LocalTime localTime) {
      this.localTime = localTime;
    }

    public LocalTime getLocalTime() {
      return localTime;
    }
  }

  @Test
  public void extendObjectMapperTest() throws JsonProcessingException {
    JodaMapper objectMapper = new JodaMapper();
    objectMapper.setWriteDatesAsTimestamps(false);
    objectMapper.setSerializationInclusion(Include.NON_EMPTY);
    Thing thing = new Thing();
    LocalTime localTime = new LocalTime(12389340L);
    thing.setLocalTime(localTime);
    System.out.println("Never manages to print this out: " + objectMapper.writeValueAsString(thing));
  }

  @Test
  public void configureObjectMapperTest() throws JsonProcessingException {
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.registerModule(new JodaModule());
    objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
    objectMapper.setSerializationInclusion(Include.NON_EMPTY);
    Thing thing = new Thing();
    LocalTime localTime = new LocalTime(12389340L);
    thing.setLocalTime(localTime);
    System.out.println("Never manages to print this out: " + objectMapper.writeValueAsString(thing));
  }
}

我尝试扩展 ObjectMapper 和配置 ObjectMapper，但每次都出现相同的错误。

依赖关系：

JodaTime 2.6
FasterXML 的杰克逊 2.5.0
FasterXML 的 Jackson-DataType-Joda 2.5.0

有趣的是，您可以在 GitHub a unit test ("testLocalDateSer()") 中找到声称使用 Include.NON_EMPTY 限定符成功的内容。我看不出它是如何发挥作用的。

Answer 1

升级到

FasterXML 的杰克逊 2.5.3
FasterXML 的 Jackson-DataType-Joda 2.5.3.

这有效。

 @Test
  public void configureObjectMapperTest() throws JsonProcessingException {
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.registerModule(new JodaModule());
//    objectMapper.configure(SerializationFeature.WRITE_DURATIONS_AS_TIMESTAMPS, false);
    objectMapper.setSerializationInclusion(Include.NON_EMPTY);
    Thing thing = new Thing();
    LocalTime localTime = new LocalTime(12389340L);
    thing.setLocalTime(localTime);
    System.out.println("Never manages to print this out: " + objectMapper.writeValueAsString(thing));
  }

JodaTime LocalTime 到 JSON - 实际堆栈

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