spring batch exception无法构造java.util.Map $ Entry
从命令行执行spring批处理作业时，我们面临以下exception。 Spring Batch Version – 3.0.2.RELEASE Spring Version – 4.0.0.RELEASE xStream version – 1.4.7 Data Base – mysql（我连接到新的数据库模式。）使用以下命令执行作业时，我遇到exception…
java %JAVA_OPTS% org.springframework.batch.core.launch.support.CommandLineJobRunner config/spring-config.xml partitionJdbcJob Exception ---------- INFO: Loaded JDBC driver: com.mysql.jdbc.Driver Feb 20, 2015 3:22:28 PM org.springframework.batch.core.launch.support.SimpleJobLauncher afterPropertiesSet INFO: No TaskExecutor has been set, defaulting to synchronous executor. Feb 20, 2015 3:22:29 PM org.springframework.batch.core.launch.support.SimpleJobLauncher run INFO: Job: [FlowJob: [name=partitionJdbcJob]] launched with the following parameters: [{}] Feb 20, 2015 3:22:29 PM org.springframework.batch.core.job.AbstractJob execute SEVERE: Encountered fatal error executing job org.springframework.batch.core.JobExecutionException: Flow execution ended unexpectedly at org.springframework.batch.core.job.flow.FlowJob.doExecute(FlowJob.java:140) at org.springframework.batch.core.job.AbstractJob.execute(AbstractJob.java:304) at org.springframework.batch.core.launch.support.SimpleJobLauncher$1.run(SimpleJobLauncher.java:135) at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50) at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:128) at org.springframework.batch.core.launch.support.CommandLineJobRunner.start(CommandLineJobRunner.java:362) at org.springframework.batch.core.launch.support.CommandLineJobRunner.main(CommandLineJobRunner.java:590) Caused by: org.springframework.batch.core.job.flow.FlowExecutionException: Ended flow=partitionJdbcJob at state=partitionJdbcJob.step with exception at org.springframework.batch.core.job.flow.support.SimpleFlow.resume(SimpleFlow.java:174) at org.springframework.batch.core.job.flow.support.SimpleFlow.start(SimpleFlow.java:144) at org.springframework.batch.core.job.flow.FlowJob.doExecute(FlowJob.java:134) ... 6 more Caused by: com.thoughtworks.xstream.converters.ConversionException: Cannot construct java.util.Map$Entry : java.util.Map$Entry : Cannot construct java.util.Map$ Entry : java.util.Map$Entry ---- Debugging information ---- message : Cannot construct java.util.Map$Entry : java.util.Map$Entry cause-exception : com.thoughtworks.xstream.converters.reflection.ObjectAccessException cause-message : Cannot construct java.util.Map$Entry : java.util.Map$Entry class : java.util.Map$Entry required-type : java.util.Map$Entry converter-type : com.thoughtworks.xstream.converters.reflection.ReflectionConverter path : /map/map/entry line number : -1 class[1] : java.util.HashMap converter-type[1] : com.thoughtworks.xstream.converters.collections.MapConverter version : 1.4.7 ------------------------------- at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:79) at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50) at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.readItem(AbstractCollectionConverter.java:71) at com.thoughtworks.xstream.converters.collections.MapConverter.putCurrentEntryIntoMap(MapConverter.java:106) at com.thoughtworks.xstream.converters.collections.MapConverter.populateMap(MapConverter.java:98) at com.thoughtworks.xstream.converters.collections.MapConverter.populateMap(MapConverter.java:92) at com.thoughtworks.xstream.converters.collections.MapConverter.unmarshal(MapConverter.java:87) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50) at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134) at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32) at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1185) at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1169) at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1040) at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1031) at org.springframework.batch.core.repository.dao.XStreamExecutionContextStringSerializer.deserialize(XStreamExecutionContextStringSerializer.java:112) at org.springframework.batch.core.repository.dao.XStreamExecutionContextStringSerializer.deserialize(XStreamExecutionContextStringSerializer.java:45) at org.springframework.batch.core.repository.dao.JdbcExecutionContextDao$ExecutionContextRowMapper.mapRow(JdbcExecutionContextDao.java:322) at org.springframework.batch.core.repository.dao.JdbcExecutionContextDao$ExecutionContextRowMapper.mapRow(JdbcExecutionContextDao.java:309) at org.springframework.jdbc.core.RowMapperResultSetExtractor.extractData(RowMapperResultSetExtractor.java:93) at org.springframework.jdbc.core.RowMapperResultSetExtractor.extractData(RowMapperResultSetExtractor.java:60) at org.springframework.jdbc.core.JdbcTemplate$1.doInPreparedStatement(JdbcTemplate.java:706) at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:642) at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:693) at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:725) at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:735) at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:790) at org.springframework.batch.core.repository.dao.JdbcExecutionContextDao.getExecutionContext(JdbcExecutionContextDao.java:127) at org.springframework.batch.core.repository.support.SimpleJobRepository.getLastStepExecution(SimpleJobRepository.java:238) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207) at $Proxy7.getLastStepExecution(Unknown Source) at org.springframework.batch.core.job.SimpleStepHandler.handleStep(SimpleStepHandler.java:115) at org.springframework.batch.core.job.flow.JobFlowExecutor.executeStep(JobFlowExecutor.java:64) at org.springframework.batch.core.job.flow.support.state.StepState.handle(StepState.java:67) at org.springframework.batch.core.job.flow.support.SimpleFlow.resume(SimpleFlow.java:165) ... 8 more Caused by: com.thoughtworks.xstream.converters.reflection.ObjectAccessException: Cannot construct java.util.Map$Entry : java.util.Map$Entry at com.thoughtworks.xstream.converters.reflection.SunLimitedUnsafeReflectionProvider.newInstance(SunLimitedUnsafeReflectionProvider.java:80) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.instantiateNewInstance(AbstractReflectionConverter.java:553) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:256) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) ... 57 more Caused by: java.lang.InstantiationException: java.util.Map$Entry at sun.misc.Unsafe.allocateInstance(Native Method) at com.thoughtworks.xstream.converters.reflection.SunLimitedUnsafeReflectionProvider.newInstance(SunLimitedUnsafeReflectionProvider.java:76) ... 60 more Spring Config ---------------- 300000 60000 false true Feb 20, 2015 3:22:29 PM org.springframework.batch.core.launch.support.SimpleJobLauncher run INFO: Job: [FlowJob: [name=partitionJdbcJob]] completed with the following parameters: [{}] and the following status: [FAILED] Feb 20, 2015 3:22:29 PM org.springframework.context.support.ClassPathXmlApplicationContext doClose INFO: Closing org.springframework.context.support.ClassPathXmlApplicationContext @d37d44: startup date [Fri Feb 20 15:22:27 IST 2015]; root of context hierarchy 运行Spring Batch Job时遇到同样的问题。 在：
Set runningJobExecutions = jobExplorer.findRunningJobExecutions(jobName);
使用jettison 1.1而不是1.3.2解决
虽然更改Jettison jar的版本也为我摆脱了错误，但这并没有解决潜在的问题。
在我的情况下，最终的原因是有两个同名的步骤。 一旦我解决了这个问题，报告的exception就消失了。
错误消息虽然混淆点重复作业/步骤。 创建独特的工作/步骤有助于解决我的问题。 无需其他更改。