# Stop Paying Full Price: Orchestrate Claude's 50% Off Batch API with Spring Batch and Virtual Threads

> Source: <https://dev.to/machinecodingmaster/stop-paying-full-price-orchestrate-claudes-50-off-batch-api-with-spring-batch-and-virtual-threads-3imi>
> Published: 2026-07-12 05:42:54+00:00

In 2026, firing synchronous API calls to Claude 3.5 Sonnet for offline workloads like data labeling or document summarization is a fireable offense for your cloud budget. If your processing doesn't require sub-second human interaction, you must route it through Anthropic’s 50%-off Batch API using a robust, self-healing orchestration pipeline.

`canceling`

, `processing`

, `ended`

) instead of leveraging a proven state machine.Combine the declarative chunk-processing of Spring Batch 5.x with the lightweight, non-blocking polling of Java 21+ Virtual Threads to manage the lifecycle of Anthropic's asynchronous batch jobs.

`TaskExecutor`

configured with `Executors.newVirtualThreadPerTaskExecutor()`

in your Spring Batch step configuration to handle non-blocking, asynchronous polling of the Claude Batch API endpoint (`/v1/messages/batches`

).`msg_batch_xxxxxxxx`

) directly in the Spring Batch metadata database (`BATCH_JOB_EXECUTION_PARAMS`

) to ensure seamless resume-on-failure capabilities.`Thread.sleep()`

) that yields the carrier thread, keeping your memory footprint at near-zero during the 24-hour SLA window.Want to go deeper?

[javalld.com]— machine coding interview problems with working Java code and full execution traces.

```
@Bean
public Step pollClaudeBatchStep(JobRepository jobRepository, PlatformTransactionManager txManager) {
    return new StepBuilder("pollClaudeBatchStep", jobRepository)
        .tasklet((contribution, chunkContext) -> {
            String batchId = (String) chunkContext.getStepContext().getJobParameters().get("claudeBatchId");
            while (!isBatchComplete(batchId)) {
                // Virtual thread yields gracefully here without blocking OS threads
                Thread.sleep(Duration.ofMinutes(5)); 
            }
            return RepeatStatus.FINISHED;
        }, txManager)
        .taskExecutor(Executors.newVirtualThreadPerTaskExecutor()) 
        .build();
}
```

`/v1/messages/batches`

instantly cuts your API bill in half.