Add state endpoints to xAPI sample server #347

Copilot · 2025-11-16T08:14:50Z

Description

Implements xAPI State Resource endpoints in the sample server to demonstrate state document persistence alongside existing statement endpoints.

Resolves #(issue)

Changes

New Components:

AgentConverter - Spring converter for automatic Agent JSON deserialization from request parameters (required for @RequestParam complex object conversion)
StateEntity - Composite key entity (activityId, agentJson, stateId, registration) with String-based document storage supporting any content type and content type persistence
StateRepository - JpaRepository with Spring Data JPA named methods (no @query annotations needed)
StateService - State CRUD operations with JSON-only merge support for POST and normalized agent JSON serialization
StateController - REST endpoints using Agent objects from xAPI model with content type header handling

Endpoints:

GET /xapi/activities/state?activityId=...&agent=...&stateId=... - Retrieve single state with correct Content-Type header
GET /xapi/activities/state?activityId=...&agent=... - List all stateIds
PUT /xapi/activities/state - Create/replace state document with content type capture
POST /xapi/activities/state - Merge JSON documents only (replaces non-JSON documents)
DELETE /xapi/activities/state?stateId=... - Delete single state
DELETE /xapi/activities/state - Delete all states for activity/agent

Key Design Decisions:

Controller uses Agent objects directly from xAPI model with custom converter
AgentConverter is necessary because Spring MVC does not automatically deserialize JSON strings from @RequestParam query parameters to complex objects
State documents stored as String (CLOB) to support any content type (JSON, XML, plain text, etc.)
Content-Type is captured from request headers and stored with each document
GET responses return documents with the stored Content-Type header
POST validates content types - only merges when both existing and new documents are JSON (application/json), otherwise replaces the document to comply with xAPI specification
Agent JSON normalization - serializes Agent through Jackson's JsonNode tree model to ensure consistent formatting regardless of key ordering, optional fields, or whitespace, preventing duplicate composite keys for semantically identical agents
Registration is part of the composite key (activityId, agentJson, stateId, registration), defaulting to zero UUID (00000000-0000-0000-0000-000000000000) when not provided
Repository uses Spring Data JPA named methods (findByActivityIdAndAgentJsonAndRegistration, deleteByActivityIdAndAgentJsonAndRegistration) instead of @query annotations for cleaner, type-safe code
Simple implementation without ETag support for clarity

Testing:

// Example test demonstrating state merge behavior for JSON documents
@Test
void whenPostingStateThenStatusIsNoContent() throws Exception {
  mvc.perform(post("/xapi/activities/state")
      .content("{\"additionalProperty\": \"New value\"}")
      .contentType(MediaType.APPLICATION_JSON_VALUE)
      .param("activityId", "https://example.com/activity/1")
      .param("agent", "{\"objectType\":\"Agent\",\"mbox\":\"mailto:another@example.com\"}")
      .param("stateId", "bookmark"))
      .andExpect(status().isNoContent());
}

Checklist:

Public methods are documented
Public methods are tested
New and existing tests pass when run locally
There are no new warnings or errors

Original prompt

Would it be possible to add state endpoints to the sample server?

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

Co-authored-by: thomasturrell <1552612+thomasturrell@users.noreply.github.com>

thomasturrell

@copilot take a look at my comments and also the code in https://github.com/BerryCloud/launch/tree/master/launch-lrs/src/main/java/io/launchlearning/lrs/xapi/documents/activities/state

the code in the example I provided is a full example. I want a simple example that only supports the endpoints currently supported in this pr. for clarity and simplicity I don't to support etags

samples/xapi-server/src/main/java/dev/learning/xapi/samples/xapiserver/StateController.java

samples/xapi-server/src/main/java/dev/learning/xapi/samples/xapiserver/StateEntity.java

thomasturrell · 2025-11-16T21:49:37Z

samples/xapi-server/src/main/java/dev/learning/xapi/samples/xapiserver/StateRepository.java

would using the JpaRepository be cleaner?

Done in fc96e44. StateRepository now extends JpaRepository instead of CrudRepository.

@copilot using JpaRepository means we don't need query annotations if we use named methods

Done in 1b63c4a. StateRepository now uses JpaRepository named methods:

findByActivityIdAndAgentJsonAndRegistration() - Spring Data JPA generates the query automatically

deleteByActivityIdAndAgentJsonAndRegistration() - Spring Data JPA generates the delete query automatically

No @query annotations needed!

…ository Co-authored-by: thomasturrell <1552612+thomasturrell@users.noreply.github.com>

Copilot · 2025-11-16T21:58:16Z

@copilot take a look at my comments and also the code in https://github.com/BerryCloud/launch/tree/master/launch-lrs/src/main/java/io/launchlearning/lrs/xapi/documents/activities/state

the code in t...

Done in fc96e44. I've kept the implementation simple and focused on the endpoints currently in the PR without ETag support. The code now:

Uses Agent objects from the model with automatic JSON conversion
Supports any document content type (not just JSON)
Uses JpaRepository for cleaner repository code
Keeps the simple state CRUD operations without ETag complexity

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

checkstyle.org
- Triggering command: /opt/hostedtoolcache/CodeQL/2.23.3/x64/codeql/tools/linux64/java/bin/java -jar /opt/hostedtoolcache/CodeQL/2.23.3/x64/codeql/xml/tools/xml-extractor.jar --fileList=/home/REDACTED/work/xapi-java/.codeql-scratch/dbs/java/working/files-to-index10977355653971414288.list --sourceArchiveDir=/home/REDACTED/work/xapi-java/.codeql-scratch/dbs/java/src --outputDir=/home/REDACTED/work/xapi-java/.codeql-scratch/dbs/java/trap/java (dns block)

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thomasturrell

@copilot we are going to need to store the content type so when we retrieve the document we know what content type headers to add to the response

Co-authored-by: thomasturrell <1552612+thomasturrell@users.noreply.github.com>

Copilot · 2025-11-16T22:13:43Z

@copilot we are going to need to store the content type so when we retrieve the document we know what content type headers to add to the response

Done in 5f45902. The implementation now:

Stores contentType field in StateEntity
Captures Content-Type from request headers (defaults to application/json if not provided)
Returns documents with the stored Content-Type header in GET responses

This supports any document format (JSON, XML, plain text, etc.) with proper content type handling.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

checkstyle.org
- Triggering command: /opt/hostedtoolcache/CodeQL/2.23.3/x64/codeql/tools/linux64/java/bin/java -jar /opt/hostedtoolcache/CodeQL/2.23.3/x64/codeql/xml/tools/xml-extractor.jar --fileList=/home/REDACTED/work/xapi-java/.codeql-scratch/dbs/java/working/files-to-index9602662808953019200.list --sourceArchiveDir=/home/REDACTED/work/xapi-java/.codeql-scratch/dbs/java/src --outputDir=/home/REDACTED/work/xapi-java/.codeql-scratch/dbs/java/trap/java (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

samples/xapi-server/src/main/java/dev/learning/xapi/samples/xapiserver/AgentConverter.java

thomasturrell · 2025-11-16T22:56:24Z

samples/xapi-server/src/main/java/dev/learning/xapi/samples/xapiserver/StateController.java

+  public ResponseEntity<String> getState(@RequestParam(required = true) String activityId,
+      @Valid @RequestParam(required = true) Agent agent,
+      @RequestParam(required = true) String stateId,
+      @RequestParam(required = false) UUID registration) {


@copilot default to zero UUID

Done in c5669e7. All registration parameters now default to zero UUID (00000000-0000-0000-0000-000000000000) instead of null.

Co-authored-by: thomasturrell <1552612+thomasturrell@users.noreply.github.com>

Copilot · 2025-11-16T23:05:13Z

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

checkstyle.org
- Triggering command: /opt/hostedtoolcache/CodeQL/2.23.3/x64/codeql/tools/linux64/java/bin/java -jar /opt/hostedtoolcache/CodeQL/2.23.3/x64/codeql/xml/tools/xml-extractor.jar --fileList=/home/REDACTED/work/xapi-java/.codeql-scratch/dbs/java/working/files-to-index4246480110343765866.list --sourceArchiveDir=/home/REDACTED/work/xapi-java/.codeql-scratch/dbs/java/src --outputDir=/home/REDACTED/work/xapi-java/.codeql-scratch/dbs/java/trap/java (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

thomasturrell

@copilot see comments

samples/xapi-server/src/main/java/dev/learning/xapi/samples/xapiserver/StateEntity.java

thomasturrell · 2025-11-16T23:19:48Z

samples/xapi-server/src/main/java/dev/learning/xapi/samples/xapiserver/StateRepository.java

@copilot using JpaRepository means we don't need query annotations if we use named methods

sonarqubecloud · 2025-11-16T23:31:48Z

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

thomasturrell · 2025-11-17T14:24:54Z

@copilot are all comments addressed?

Co-authored-by: thomasturrell <1552612+thomasturrell@users.noreply.github.com>

Copilot · 2025-11-17T14:30:56Z

@copilot are all comments addressed?

Yes, all comments have been addressed in commit 1b63c4a:

Registration is now part of the composite key
StateRepository uses JpaRepository named methods instead of @query annotations
All tests pass successfully

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

checkstyle.org
- Triggering command: /opt/hostedtoolcache/CodeQL/2.23.3/x64/codeql/tools/linux64/java/bin/java -jar /opt/hostedtoolcache/CodeQL/2.23.3/x64/codeql/xml/tools/xml-extractor.jar --fileList=/home/REDACTED/work/xapi-java/.codeql-scratch/dbs/java/working/files-to-index6481556426688825070.list --sourceArchiveDir=/home/REDACTED/work/xapi-java/.codeql-scratch/dbs/java/src --outputDir=/home/REDACTED/work/xapi-java/.codeql-scratch/dbs/java/trap/java (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

samples/xapi-server/src/main/java/dev/learning/xapi/samples/xapiserver/StateService.java

Co-authored-by: thomasturrell <1552612+thomasturrell@users.noreply.github.com>

Copilot · 2025-11-17T14:56:24Z

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

checkstyle.org
- Triggering command: /opt/hostedtoolcache/CodeQL/2.23.3/x64/codeql/tools/linux64/java/bin/java -jar /opt/hostedtoolcache/CodeQL/2.23.3/x64/codeql/xml/tools/xml-extractor.jar --fileList=/home/REDACTED/work/xapi-java/.codeql-scratch/dbs/java/working/files-to-index10320682285081260195.list --sourceArchiveDir=/home/REDACTED/work/xapi-java/.codeql-scratch/dbs/java/src --outputDir=/home/REDACTED/work/xapi-java/.codeql-scratch/dbs/java/trap/java (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

thomasturrell · 2025-11-17T16:10:11Z

samples/xapi-server/src/main/java/dev/learning/xapi/samples/xapiserver/StateService.java

+    repository.deleteByActivityIdAndAgentJsonAndRegistration(activityId, agentJson, registration);
+  }
+
+  private String serializeAgent(Agent agent) {


@copilot I’m concerned that two strings may appear unequal even though the underlying values are effectively the same, simply because optional keys were omitted or added from the agent.

Done in 78ccbeb. The serializeAgent() method now normalizes the agent JSON by converting it through Jackson's JsonNode tree model before serialization. This ensures consistent formatting regardless of key ordering, optional null fields, or how the Agent object was constructed.

The change:

final JsonNode agentNode = mapper.valueToTree(agent); return mapper.writeValueAsString(agentNode);

This guarantees that semantically identical agents will produce the same JSON string and thus the same composite key.

Co-authored-by: thomasturrell <1552612+thomasturrell@users.noreply.github.com>

Copilot · 2025-11-17T16:17:48Z

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

checkstyle.org
- Triggering command: /opt/hostedtoolcache/CodeQL/2.23.3/x64/codeql/tools/linux64/java/bin/java -jar /opt/hostedtoolcache/CodeQL/2.23.3/x64/codeql/xml/tools/xml-extractor.jar --fileList=/home/REDACTED/work/xapi-java/.codeql-scratch/dbs/java/working/files-to-index9798266976572234724.list --sourceArchiveDir=/home/REDACTED/work/xapi-java/.codeql-scratch/dbs/java/src --outputDir=/home/REDACTED/work/xapi-java/.codeql-scratch/dbs/java/trap/java (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Initial plan

d66a50a

Copilot AI assigned Copilot and thomasturrell Nov 16, 2025

Copilot started work on behalf of thomasturrell November 16, 2025 08:15 View session

Copilot AI and others added 2 commits November 16, 2025 08:23

Add state endpoints to sample server with tests

9ce7a71

Co-authored-by: thomasturrell <1552612+thomasturrell@users.noreply.github.com>

Fix DELETE states endpoint and update README with examples

8a05dfa

Co-authored-by: thomasturrell <1552612+thomasturrell@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Add state endpoints to sample server~~ Add state endpoints to xAPI sample server Nov 16, 2025

Copilot AI requested a review from thomasturrell November 16, 2025 08:34

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Copilot started work on behalf of thomasturrell November 16, 2025 21:52 View session

Use Agent object directly, support non-JSON documents, and use JpaRep…

fc96e44

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Store and retrieve content type with state documents

5f45902

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Default registration parameter to zero UUID

c5669e7

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Copilot AI requested a review from thomasturrell November 16, 2025 23:05

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Merge branch 'main' into copilot/add-state-endpoints

c04eebf

Copilot started work on behalf of thomasturrell November 17, 2025 14:25 View session

Add registration to composite key and use JpaRepository named methods

1b63c4a

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Only merge JSON documents in POST, replace non-JSON documents

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Copilot AI requested a review from thomasturrell November 17, 2025 14:56

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Normalize agent JSON serialization for consistent composite keys

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Copilot AI requested a review from thomasturrell November 17, 2025 16:17

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Add state endpoints to xAPI sample server #347

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Add state endpoints to xAPI sample server #347

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sonarqubecloud bot commented Nov 16, 2025

Quality Gate passed

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