return kuromojiService.getKuromojiFile(form.dictId).map(file -> {
            try (InputStream inputStream = form.kuromojiFile.getInputStream()) {
                file.update(inputStream);
            } catch (final IOException e) {
                logger.warn("Failed to process a request.", e);
                throwValidationError(messages -> messages.addErrorsFailedToUploadKuromojiFile(GLOBAL),

        try {
            thumbnailJob.executeThumbnailGenerator();
            fail("Should throw JobProcessingException");
        } catch (JobProcessingException e) {
            assertTrue(e.getMessage().contains("Thumbnail Process terminated."));
        } catch (NullPointerException e) {
            // May occur if ServletContext is not fully initialized
            // This is acceptable in test environment
        }

                    ArtifactRepositoryPolicy.CHECKSUM_POLICY_WARN,
                    true);
        } catch (org.apache.maven.wagon.TransferFailedException e) {
            throw new ArtifactTransferFailedException(getMessage(e, "Error transferring artifact."), e);
        } catch (org.apache.maven.wagon.ResourceDoesNotExistException e) {

    assertThat(future.isCancelled()).isFalse();

    try {
      getDone(future);
      fail();
    } catch (ExecutionException e) {
      assertThat(e).hasCauseThat().isSameInstanceAs(expectedException);
    }

    try {
      getDoneFromTimeoutOverload(future);
      fail();
    } catch (ExecutionException e) {
      assertThat(e).hasCauseThat().isSameInstanceAs(expectedException);
    }

                fos.write(chunk);
            }
        }

        try {
            FileUtil.readBytes(largeFile);
            fail("Expected IORuntimeException for large file");
        } catch (final IORuntimeException e) {
            assertTrue("Error message should mention file size", e.getMessage().contains("File too large"));
        }
    }

    /**
     * Test readBytes with file within size limit

            }
            stream.close();
        } catch (IOException e) {
            throw new PACDecodingException("Malformed kerberos ticket", e);
        }

        ASN1Sequence sequence;
        try {
            sequence = ASN1Util.as(ASN1Sequence.class, derToken.getBaseObject());
        } catch (IOException e) {
            throw new PACDecodingException("Malformed kerberos ticket", e);

                int compressedSize = deflater.deflate(buffer);
                baos.write(buffer, 0, compressedSize);
            }

            deflater.end();
            return baos.toByteArray();
        } catch (Exception e) {
            throw new CIFSException("LZ77 compression failed", e);
        }
    }

    /**
     * Decompresses LZ77 data.
     */

            }
            aliasesRequestBuilder.execute().actionGet(suggestSettings.getIndicesTimeout());
        } catch (final SuggesterException e) {
            // Re-throw SuggesterException with original message
            throw e;
        } catch (final Exception e) {
            if (logger.isDebugEnabled()) {

### 9.2 Thread Safety
- Use concurrent data structures for lease storage
- Minimize lock contention in hot paths
- Async handling of lease breaks

### 9.3 Network Efficiency
- Batch lease requests when possible
- Implement lease key reuse for related files
- Optimize lease break acknowledgment timing

## 10. Error Handling

### 10.1 Lease Break Timeout
```java

        } catch (final IllegalArgumentException e) {
            assertTrue(e.getMessage().contains("xml"));
        }
    }

    @Test
    public void test_createFormatter_null() {
        try {
            indexExportJob.createFormatter(null);
            fail("Expected IllegalArgumentException");
        } catch (final IllegalArgumentException e) {