问题描述
我在使用 2.12.0 版以上的 jackson jr310 数据类型时遇到问题，而这与 2.11.4 版完美配合。
这是我的 POJO：
import java.time.OffsetDateTime;
public class Pojo {
OffsetDateTime aDateTime;
public OffsetDateTime getaDateTime() {
return aDateTime;
}
public void setaDateTime(OffsetDateTime aDateTime) {
this.aDateTime = aDateTime;
}
}
spring 应用程序：
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import java.time.Instant;
import java.time.ZoneOffset;
@SpringBootApplication
public class OffsetTimeTestApplication {
public static void main(String[] args) {
SpringApplication.run(OffsetTimeTestApplication.class,args);
}
public OffsetTimeTestApplication() {
ObjectMapper mapper = new ObjectMapper();
Pojo pojo = new Pojo();
pojo.setaDateTime(Instant.Now().atOffset(ZoneOffset.UTC));
try {
mapper.writeValueAsstring(pojo);
} catch (JsonProcessingException e) {
e.printstacktrace();
}
}
}
我的 build.gradle 文件中的相关部分：
dependencies {
implementation 'org.springframework.boot:spring-boot-starter'
implementation group: 'com.fasterxml.jackson.core',name: 'jackson-core',version: '2.12.3'
implementation group: 'com.fasterxml.jackson.core',name: 'jackson-annotations',name: 'jackson-databind',version: '2.12.3'
runtimeOnly group: 'com.fasterxml.jackson.datatype',name: 'jackson-datatype-jsr310',version: '2.12.3'
developmentOnly 'org.springframework.boot:spring-boot-devtools'
testImplementation 'org.springframework.boot:spring-boot-starter-test'
}
我得到的例外是：
com.fasterxml.jackson.databind.exc.InvalidDeFinitionException: Java 8 date/time type `java.time.OffsetDateTime` not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" to enable handling (through reference chain: com.enervalis.offsettimetest.Pojo["aDateTime"])
at com.fasterxml.jackson.databind.exc.InvalidDeFinitionException.from(InvalidDeFinitionException.java:77)
at com.fasterxml.jackson.databind.SerializerProvider.reportBadDeFinition(SerializerProvider.java:1276)
at com.fasterxml.jackson.databind.ser.impl.UnsupportedTypeSerializer.serialize(UnsupportedTypeSerializer.java:35)
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728)
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializefields(BeanSerializerBase.java:770)
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:178)
at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480)
at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319)
at com.fasterxml.jackson.databind.ObjectMapper._writeValueAndClose(ObjectMapper.java:4487)
at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsstring(ObjectMapper.java:3742)
at com.enervalis.offsettimetest.OffsetTimeTestApplication.<init>(OffsetTimeTestApplication.java:24)
at com.enervalis.offsettimetest.OffsetTimeTestApplication$$EnhancerBySpringcglib$$f83afa20.<init>(<generated>)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:212)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:87)
at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.instantiateBean(AbstractAutowireCapablebeanfactory.java:1308)
at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.createBeanInstance(AbstractAutowireCapablebeanfactory.java:1214)
at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.doCreateBean(AbstractAutowireCapablebeanfactory.java:564)
at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.createBean(AbstractAutowireCapablebeanfactory.java:524)
at org.springframework.beans.factory.support.Abstractbeanfactory.lambda$doGetBean$0(Abstractbeanfactory.java:335)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
at org.springframework.beans.factory.support.Abstractbeanfactory.doGetBean(Abstractbeanfactory.java:333)
at org.springframework.beans.factory.support.Abstractbeanfactory.getBean(Abstractbeanfactory.java:208)
at org.springframework.beans.factory.support.DefaultListablebeanfactory.preInstantiateSingletons(DefaultListablebeanfactory.java:944)
at org.springframework.context.support.AbstractApplicationContext.finishbeanfactoryInitialization(AbstractApplicationContext.java:918)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:438)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:337)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1336)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1325)
at com.enervalis.offsettimetest.OffsetTimeTestApplication.main(OffsetTimeTestApplication.java:16)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
将构建文件中的版本从 2.12.3 更改为 2.11.4，代码运行没有错误。
有什么遗漏吗？
这对于 2.11.4 及更低版本非常有效。
解决方法
已解决。
显然，通过添加依赖项，但不注册 JavaTimeModule，OffsetDateTime 在旧版本中被序列化为 POJO。在 > 2.11.4 版本中抛出 eException。
JavaTimeModule 必须添加到 ObjectMapper：
ObjectMapper mapper = JsonMapper.builder()
.addModule(new JavaTimeModule())
.build();