## Issue
Closes#5672
## Change
`GcsSource` built its metadata by calling `metadata.put("contentType",
blob.getContentType())`. `Blob.getContentType()` is nullable, and core
`Metadata.put(String, String)` rejects null with an
`IllegalArgumentException`. Loading a valid, non-empty object without a
content type therefore failed: `loadDocument()` threw, and
`loadDocuments()` caught the exception and silently skipped the object.
This change skips the `contentType` key when `getContentType()` returns
null, so the key is absent rather than holding a meaningless `"null"`
string. The sibling `AzureBlobStorageSource` already guards its metadata
(via `String.valueOf`); this brings the GCS loader in line. Scope is
limited to the `contentType` line.
Added `GcsSourceTest` with a Mockito-mocked `Blob`: a regression case
(null content type builds successfully, key absent) and a positive case
(`text/plain` preserved).
## General checklist
- [X] There are no breaking changes (API, behaviour)
- [X] I have added unit and/or integration tests for my change
- [X] The tests cover both positive and negative cases
- [X] I have manually run all the unit and integration tests in the
module I have added/changed, and they are all green
- [ ] I have manually run all the unit and integration tests in the core
and main modules, and they are all green
- [ ] I have added/updated the documentation
- [ ] I have added an example in the examples repo (only for "big"
features)
- [ ] I have added/updated Spring Boot starter(s) (if applicable)
## Issue
Closes#4326
## Change
Added exception handling to skip failed documents in
`AzureBlobStorageDocumentLoader.loadDocuments()` and
`GoogleCloudStorageDocumentLoader.loadDocuments()`, matching the
behavior of `AmazonS3DocumentLoader` and `TencentCosDocumentLoader`.
- Added try-catch blocks to skip failed documents and log warnings
- Updated Javadoc to document skip behavior
## General checklist
- [X] There are no breaking changes (API, behaviour)
- [X] I have added unit and/or integration tests for my change
- [X] The tests cover both positive and negative cases
- [X] I have manually run all the unit and integration tests in the
module I have added/changed, and they are all green
- [X] I have manually run all the unit and integration tests in the
[core](https://github.com/langchain4j/langchain4j/tree/main/langchain4j-core)
and
[main](https://github.com/langchain4j/langchain4j/tree/main/langchain4j)
modules, and they are all green
- [ ] I have added/updated the
[documentation](https://github.com/langchain4j/langchain4j/tree/main/docs/docs)
- [ ] I have added an example in the [examples
repo](https://github.com/langchain4j/langchain4j-examples) (only for
"big" features)
- [ ] I have added/updated [Spring Boot
starter(s)](https://github.com/langchain4j/langchain4j-spring) (if
applicable)
## Checklist for adding new maven module
- [ ] I have added my new module in the root `pom.xml` and
`langchain4j-bom/pom.xml`
## Checklist for adding new embedding store integration
- [ ] I have added a `{NameOfIntegration}EmbeddingStoreIT` that extends
from either `EmbeddingStoreIT` or `EmbeddingStoreWithFilteringIT`
- [ ] I have added a `{NameOfIntegration}EmbeddingStoreRemovalIT` that
extends from `EmbeddingStoreWithRemovalIT`
## Checklist for changing existing embedding store integration
- [ ] I have manually verified that the
`{NameOfIntegration}EmbeddingStore` works correctly with the data
persisted using the latest released version of LangChain4j
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## Issue
<!-- Please specify the ID of the issue this PR is addressing. For
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## Change
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## General checklist
<!-- Please double-check the following points and mark them like this:
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module I have added/changed, and they are all green
- [ ] I have manually run all the unit and integration tests in the
[core](https://github.com/langchain4j/langchain4j/tree/main/langchain4j-core)
and
[main](https://github.com/langchain4j/langchain4j/tree/main/langchain4j)
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<!-- Before adding documentation and example(s) (below), please wait
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applicable)
## Checklist for adding new maven module
<!-- Please double-check the following points and mark them like this:
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## Checklist for adding new embedding store integration
<!-- Please double-check the following points and mark them like this:
[X] -->
- [ ] I have added a `{NameOfIntegration}EmbeddingStoreIT` that extends
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- [ ] I have added a `{NameOfIntegration}EmbeddingStoreRemovalIT` that
extends from `EmbeddingStoreWithRemovalIT`
## Checklist for changing existing embedding store integration
<!-- Please double-check the following points and mark them like this:
[X] -->
- [ ] I have manually verified that the
`{NameOfIntegration}EmbeddingStore` works correctly with the data
persisted using the latest released version of LangChain4j
Eunbin Son