Programmer-yyds opened a new issue, #879:
URL: https://github.com/apache/poi/issues/879
**Environment:**
- Java 21
- Apache POI 5.4.0
**Description:**
When using Apache POI to export an XLSX file containing a large number of
images, the program encounters an OOM error.
To mitigate the memory issue, I added the following configuration:
```
static {
ZipPackage.setUseTempFilePackageParts(true);
}
```
This configuration successfully resolved the OOM problem, but introduced a
new issue:
- A large number of temporary files are created during the XLSX file
generation process
- These temporary files are **not** automatically deleted after the program
finishes
- Frequent exports cause temporary files to accumulate, eventually
exhausting container disk space
**Expected Result:**
- Provide an automatic cleanup mechanism for temporary files, or release the
related temporary file resources when the `Workbook` is closed
- If cleanup cannot be done on close, in multi-threaded scenarios, generate
separate temporary file directories for each file to distinguish them and
safely clean up
**Steps to Reproduce:**
1. Create an export logic for an XLSX file containing many images
2. Enable `ZipPackage.setUseTempFilePackageParts(true)`
3. Repeatedly perform the export operation and observe the temporary file
directory (e.g., `/tmp`)
**Impact:**
- A large number of temporary files occupy disk space, potentially
exhausting container storage
**Temporary Workaround & Limitations:**
- Manually clean up temporary files, but with the following issues:
- In a multi-threaded environment, all threads write temporary files to
the same directory
- Cannot distinguish between temporary files from completed exports and
those still being generated
- Deleting files blindly may corrupt files that are still being created
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