Spring Batch ExecutionContext deserialization for PostGreSQL JOB_EXECUTION_CONTEXT failing - deserialization

Question

I am trying to create a Spring Batch POC with Java Configuration and PostGreSQL.
I have successfully created beans that would have otherwise been provided via the in memory DB using #EnableBatchProcessing and #EnableAutoConfiguration.
I am not able to get the beans (JobExplorer) to return a JobExecution list given a JobInstance bean created from the same JobExplorer bean.
The error I am getting is "Unable to deserialize the execution context" which seems to be coming from the method trying to deserialize the "SHORT_CONTEXT" field of the JOB_EXECUTION_CONTEXT table.
I have passed the created JobExplorer bean DefaultExecutionContextSerializer. Later passed a DefaultLobHandler with "wrapAsLob" set to True when I was still getting the error.
#Bean
public JobRegistry jobRegistry() {
JobRegistry jr = new MapJobRegistry();
return jr;
}
#Bean
public JobRegistryBeanPostProcessor jobRegistryBeanPostProcessor() {
JobRegistryBeanPostProcessor jrbpp = new JobRegistryBeanPostProcessor();
jrbpp.setJobRegistry(jobRegistry());
return jrbpp;
}
#Bean
public JobOperator jobOperator() {
SimpleJobOperator sjo = new SimpleJobOperator();
sjo.setJobExplorer(jobExplorer());
sjo.setJobLauncher(jobLauncher());
sjo.setJobRegistry(jobRegistry());
sjo.setJobRepository(jobRepository());
return sjo;
}
#Bean
public JobExplorer jobExplorer() {
JobExplorerFactoryBean jefb = new JobExplorerFactoryBean();
jefb.setDataSource(dataSource());
jefb.setJdbcOperations(jdbcTemplate);
jefb.setTablePrefix("batch_");
jefb.setSerializer(new DefaultExecutionContextSerializer());
DefaultLobHandler lh = new DefaultLobHandler();
lh.setWrapAsLob(true);
jefb.setLobHandler(lh);
JobExplorer je = null;
try {
je = jefb.getObject();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return je;
}
#ConfigurationProperties(prefix = "spring.datasource")
#Bean
#Primary
public DataSource dataSource() {
return DataSourceBuilder.create().build();
}
#Bean
public JobRepository jobRepository() {
JobRepositoryFactoryBean jrfb = new JobRepositoryFactoryBean();
jrfb.setDataSource(dataSource());
jrfb.setDatabaseType("POSTGRES");
jrfb.setTransactionManager(new ResourcelessTransactionManager());
jrfb.setSerializer(new DefaultExecutionContextSerializer());
jrfb.setTablePrefix("batch_");
JobRepository jr = null;
try {
jr = (JobRepository)jrfb.getObject();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return jr;
}
Below is the get method in my rest controller where I am trying handle generate a list of failed Job executions
#Autowired
JobLauncher jobLauncher;
#Autowired
JobRegistry jobRegistry;
#Autowired
JobOperator jobOperator;
#Autowired
JobExplorer jobExplorer;
#SuppressWarnings("unchecked")
#GetMapping("batch/failedJobs")
public Map<String, List<JobExecution>> getFailedJobs() {
try {
if (jobRegistry == null || jobOperator == null || jobExplorer == null) {
System.out.println("job registry, operator or explorer is null");
} else {
Map<String, List<JobExecution>> allJobInstances = new HashMap<String, List<JobExecution>>();
// Get all jobs
jobRegistry.getJobNames().stream().forEach(jobName -> {
jobExplorer.getJobInstances(jobName, 1, 1000).forEach(l -> {
System.out.println("jobName: " + jobName + " instance: " + l);
});
jobExplorer.getJobInstances(jobName, 1, 1000).stream().forEach(jobInstance -> {
List<JobExecution> execultionList = jobExplorer.getJobExecutions(jobInstance); //Failing here
if (execultionList != null) {
System.out.println("" + execultionList);
execultionList.stream().forEach(l2 -> {
System.out.println("jobName: " + jobName + " instance: " + jobInstance
+ " jobExecution: " + l2);
});
if(allJobInstances.get(jobName) == null) {
allJobInstances.put(jobName, new ArrayList<JobExecution>());
}
allJobInstances.get(jobName).addAll((Collection<? extends JobExecution>) jobExplorer.getJobExecutions(jobInstance).stream().filter(e -> e.getStatus().equals(BatchStatus.FAILED)));
}else {
System.out.println("Could not get jobExecution for jobName " + jobName + " jobInstance: " + jobInstance);
}
});
});
return allJobInstances;
}
}catch (Exception e) {
System.out.println(e.getMessage());
logger.info(e.getMessage());
}
return null;
}

Answer 1

I fixed a similar issue by changing to the Jackson2 serializer:
jefb.setSerializer(new Jackson2ExecutionContextStringSerializer());
You may try it.