意外的令牌 (START_OBJECT)，预期的 VALUE_STRING:需要包含类型 id 的 JSON 字符串(用于 java.lang.Object 的子类型) [英] Unexpected token (START_OBJECT), expected VALUE_STRING: need JSON String that contains type id (for subtype of java.lang.Object)
本文介绍了意外的令牌 (START_OBJECT)，预期的 VALUE_STRING:需要包含类型 id 的 JSON 字符串(用于 java.lang.Object 的子类型)的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我已经浏览了以下几个链接，但没有解决我的问题:
I already went through the below few links, but it did not solved my problem:
- Java Jackson:反序列化复杂的多态对象模型:JsonMappingException:意外令牌(START_OBJECT)，预计为 VALUE_STRING
- Java Jackson - 意外令牌 (START_ARRAY)，预期 VALUE_STRING
在我的项目中，我们有 15 个批处理作业.我正在将 15 个批处理作业转换为 15 个不同的微服务.为此，我创建了一个 Spring Boot 模块，其中包含实体类、JPA 存储库层和服务层.我将把那个 jar 导入到每个微服务(批处理作业)中，这样批处理作业应该可以正常工作.
In my project, we've 15 batch jobs. I am converting 15 batch jobs into 15 different micro-services. For that I have created one Spring Boot module, which has Entity classes, JPA repository layer and service layer. That jar I will import into each micro-services (batch jobs), so that batch job should work fine.
我使用的是 Spring Boot + Spring Batch - 基于 XML 的方法.
I am using Spring boot + Spring Batch - XML based approach.
所以我准备好了 XJPA 模块并导入到另一个 Spring Boot 模块中，在那里我编写了基于 XML 的批处理作业配置.
so I have XJPA module ready and imported into another Spring Boot module where I have written XML based batch job configurations.
代码:
@Component
@EnableBatchProcessing
@ImportResource("classpath:jobs/ABC_context.xml")
public class XXXLauncher {
@Autowired
private JobLauncher jobLauncher;
@Autowired
private Job job;
public void executeXXXXXXXXXXJob() {
try {
// @formatter:off
JobParameters jobParameters = new JobParametersBuilder()
.addString("runMode", "XXXX")
.addDate("date", new Date())
.addLong("time", System.currentTimeMillis()).toJobParameters();
// @formatter:on
jobLauncher.run(job, jobParameters);
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}
ABC_job.xml
<batch:job id="x">
<batch:step id="y">
<batch:tasklet ref="xyzTasklet" />
</batch:step>
</batch:job>
<bean id="stepScope" class="org.springframework.batch.core.scope.StepScope">
<property name="autoProxy" value="true"/>
</bean>
<bean id="xyzTasklet" class="com.XXXX.tasklet.xyzTasklet" scope="step">
<property name="runType" value="#{jobParameters['runMode']}" />
<property name="executionContext" value="#{stepExecution.jobExecution.executionContext}" />
</bean>
错误:
Caused by: java.lang.IllegalArgumentException: Unable to deserialize the execution context
at org.springframework.batch.core.repository.dao.JdbcExecutionContextDao$ExecutionContextRowMapper.mapRow(JdbcExecutionContextDao.java:325) ~[spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.core.repository.dao.JdbcExecutionContextDao$ExecutionContextRowMapper.mapRow(JdbcExecutionContextDao.java:309) ~[spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.jdbc.core.RowMapperResultSetExtractor.extractData(RowMapperResultSetExtractor.java:93) ~[spring-jdbc-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.jdbc.core.RowMapperResultSetExtractor.extractData(RowMapperResultSetExtractor.java:60) ~[spring-jdbc-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.jdbc.core.JdbcTemplate$1.doInPreparXXtatement(JdbcTemplate.java:667) ~[spring-jdbc-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:605) ~[spring-jdbc-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:657) ~[spring-jdbc-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:688) ~[spring-jdbc-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:700) ~[spring-jdbc-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:756) ~[spring-jdbc-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.batch.core.repository.dao.JdbcExecutionContextDao.getExecutionContext(JdbcExecutionContextDao.java:112) ~[spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.core.explore.support.SimpleJobExplorer.getJobExecutionDependencies(SimpleJobExplorer.java:202) ~[spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.core.explore.support.SimpleJobExplorer.getJobExecutions(SimpleJobExplorer.java:83) ~[spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_162]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_162]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_162]
at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_162]
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343) ~[spring-aop-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:197) ~[spring-aop-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.batch.core.configuration.annotation.SimpleBatchConfiguration$PassthruAdvice.invoke(SimpleBatchConfiguration.java:127) ~[spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at com.sun.proxy.$Proxy83.getJobExecutions(Unknown Source) ~[na:na]
at org.springframework.batch.core.JobParametersBuilder.getNextJobParameters(JobParametersBuilder.java:264) ~[spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.execute(JobLauncherCommandLineRunner.java:162) ~[spring-boot-autoconfigure-2.0.4.RELEASE.jar:2.0.4.RELEASE]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.executeLocalJobs(JobLauncherCommandLineRunner.java:179) ~[spring-boot-autoconfigure-2.0.4.RELEASE.jar:2.0.4.RELEASE]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.launchJobFromProperties(JobLauncherCommandLineRunner.java:134) ~[spring-boot-autoconfigure-2.0.4.RELEASE.jar:2.0.4.RELEASE]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.run(JobLauncherCommandLineRunner.java:128) ~[spring-boot-autoconfigure-2.0.4.RELEASE.jar:2.0.4.RELEASE]
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:800) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
... 5 common frames omitted
Caused by: com.fasterxml.jackson.databind.exc.MismatchedInputException: Unexpected token (START_OBJECT), expected VALUE_STRING: need JSON String that contains type id (for subtype of java.lang.Object)
at [Source: (ByteArrayInputStream); line: 1, column: 9] (through reference chain: java.util.HashMap["map"])
at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:59) ~[jackson-databind-2.9.6.jar:2.9.6]
at com.fasterxml.jackson.databind.DeserializationContext.wrongTokenException(DeserializationContext.java:1498) ~[jackson-databind-2.9.6.jar:2.9.6]
at com.fasterxml.jackson.databind.DeserializationContext.reportWrongTokenException(DeserializationContext.java:1273) ~[jackson-databind-2.9.6.jar:2.9.6]
at com.fasterxml.jackson.databind.jsontype.impl.AsArrayTypeDeserializer._locateTypeId(AsArrayTypeDeserializer.java:151) ~[jackson-databind-2.9.6.jar:2.9.6]
at com.fasterxml.jackson.databind.jsontype.impl.AsArrayTypeDeserializer._deserialize(AsArrayTypeDeserializer.java:96) ~[jackson-databind-2.9.6.jar:2.9.6]
at com.fasterxml.jackson.databind.jsontype.impl.AsArrayTypeDeserializer.deserializeTypedFromAny(AsArrayTypeDeserializer.java:71) ~[jackson-databind-2.9.6.jar:2.9.6]
at com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializer$Vanilla.deserializeWithType(UntypedObjectDeserializer.java:712) ~[jackson-databind-2.9.6.jar:2.9.6]
at com.fasterxml.jackson.databind.deser.std.MapDeserializer._readAndBindStringKeyMap(MapDeserializer.java:529) ~[jackson-databind-2.9.6.jar:2.9.6]
at com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:364) ~[jackson-databind-2.9.6.jar:2.9.6]
at com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:29) ~[jackson-databind-2.9.6.jar:2.9.6]
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4013) ~[jackson-databind-2.9.6.jar:2.9.6]
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3077) ~[jackson-databind-2.9.6.jar:2.9.6]
at org.springframework.batch.core.repository.dao.Jackson2ExecutionContextStringSerializer.deserialize(Jackson2ExecutionContextStringSerializer.java:70) ~[spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.core.repository.dao.Jackson2ExecutionContextStringSerializer.deserialize(Jackson2ExecutionContextStringSerializer.java:50) ~[spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
at org.springframework.batch.core.repository.dao.JdbcExecutionContextDao$ExecutionContextRowMapper.mapRow(JdbcExecutionContextDao.java:322) ~[spring-batch-core-4.0.1.RELEASE.jar:4.0.1.RELEASE]
... 34 common frames omitted
另一个错误:现在我得到了
Another error: Now I am getting
现场作业需要一个无法找到的org.springframework.batch.core.Job"类型的 bean.
Field job in required a bean of type 'org.springframework.batch.core.Job' that could not be found.
推荐答案
一旦我删除了该行
objectMapper.enableDefaultTyping();
它解决了我的问题.但要小心，在其他一些情况下需要这条线
It solved my problem. But be careful, in some other cases this line is needed
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