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chore: find the SKU in stock.json with Groovy instead of a jsonpath filter #95

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Merged
davsclaus merged 1 commit into from
Oct 2, 2026
Merged

chore: find the SKU in stock.json with Groovy instead of a jsonpath filter #95

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2 changes: 1 addition & 1 deletion ai/mcp-server/README.md
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Expand Up @@ -74,7 +74,7 @@ The MCP server is a preview feature since Camel 4.22.
1. One `ai-tool` route that answers a fixed text, with the four `camel.server.mcp-*` properties; run it and see
the server line in the log, then `initialize` and `tools/list` with `curl`.
2. Add a parameter and use `${header.sku}` in the answer; call it with `tools/call`.
3. Answer from `stock.json` with `jsonpath` and add the unknown case.
3. Answer from `stock.json`: unmarshal it, find the SKU with Groovy and add the unknown case.
4. Add the second tool and connect a real agent.

## Try changing
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13 changes: 8 additions & 5 deletions ai/mcp-server/mcp-server.camel.yaml
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Expand Up @@ -17,16 +17,19 @@
expression:
constant:
expression: resource:file:stock.json
- unmarshal:
json:
library: Jackson
# the item of that SKU as a map, or null when there is none
- setBody:
expression:
jsonpath:
expression: "$[?(@.sku == '${header.sku}')]"
resultType: java.util.List
groovy:
expression: "body.find { it.sku == headers.sku }"
- choice:
when:
- expression:
simple:
expression: "${body.size()} == 0"
expression: "${body} == null"
steps:
- setBody:
expression:
Expand All @@ -37,7 +40,7 @@
- setBody:
expression:
simple:
expression: "${body[0][qty]} ${header.sku} in stock"
expression: "${body[qty]} ${header.sku} in stock"
- log:
message: "Tool stock_level(${header.sku}): ${body}"

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2 changes: 1 addition & 1 deletion ai/mcp-server/metadata.json
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Expand Up @@ -16,7 +16,7 @@
],
"languages": [
"simple",
"jsonpath",
"groovy",
"constant"
],
"dataformats": [
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9 changes: 5 additions & 4 deletions camel-jbang-example-catalog.json
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Expand Up @@ -112,7 +112,7 @@
],
"languages": [
"simple",
"jsonpath",
"groovy",
"constant"
],
"dataformats": [
Expand Down Expand Up @@ -548,7 +548,7 @@
],
"languages": [
"simple",
"jsonpath"
"groovy"
],
"dataformats": [
"json"
Expand Down Expand Up @@ -589,11 +589,12 @@
"setBody",
"setHeader",
"choice",
"unmarshal",
"marshal"
],
"languages": [
"constant",
"jsonpath",
"groovy",
"simple"
],
"dataformats": [
Expand Down Expand Up @@ -728,7 +729,7 @@
],
"languages": [
"simple",
"jsonpath",
"groovy",
"constant"
],
"dataformats": [
Expand Down
15 changes: 7 additions & 8 deletions connect/http-client/http-client.camel.yaml
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Expand Up @@ -19,16 +19,19 @@
expression:
constant:
expression: resource:file:stock.json
- unmarshal:
json:
library: Jackson
# the item of that SKU as a map, or null when there is none
- setBody:
expression:
jsonpath:
expression: "$[?(@.sku == '${header.sku}')]"
resultType: java.util.List
groovy:
expression: "body.find { it.sku == headers.sku }"
- choice:
when:
- expression:
simple:
expression: "${body.size()} == 0"
expression: "${body} == null"
steps:
- setHeader:
name: CamelHttpResponseCode
Expand All @@ -41,10 +44,6 @@
expression: '{"error": "unknown sku ${header.sku}"}'
otherwise:
steps:
- setBody:
expression:
simple:
expression: "${body[0]}"
- marshal:
json:
library: Jackson
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2 changes: 1 addition & 1 deletion connect/http-client/metadata.json
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Expand Up @@ -22,7 +22,7 @@
],
"languages": [
"simple",
"jsonpath"
"groovy"
],
"dataformats": [
"json"
Expand Down
10 changes: 5 additions & 5 deletions connect/stock-api/README.md
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Expand Up @@ -40,17 +40,17 @@ Then, in another terminal, call it with `curl` as above. Stop it with `ctrl` + `
item. Each operation hands over to a `direct` route. The CLI starts the HTTP server on port 8080 because the
file uses the REST DSL; `application.properties` sets the port.
- The list route sets the body to `resource:file:stock.json`, the file next to the route, and the content type.
- The item route loads the same file and picks the item with a `jsonpath` filter, `$[?(@.sku == '...')]`, in which
the `{sku}` path parameter arrives as the header `sku`. The result is a list: empty means 404 with a small error
body, otherwise the first element is marshalled back to JSON.
- The item route loads the same file, unmarshals it into a list of maps, and picks the item with one line of Groovy,
`body.find { it.sku == headers.sku }`, in which the `{sku}` path parameter arrives as the header `sku`. The result is
the item or null: null means 404 with a small error body, otherwise the item is marshalled back to JSON.
- `CamelHttpResponseCode` is the header that sets the status code; 200 is the default.

## Build it step by step

1. A `rest` with one `get` that answers `resource:file:stock.json`; run it and `curl localhost:8080/stock`.
2. Add the `/{sku}` operation and log `${header.sku}` to see the path parameter arrive.
3. Filter the file with `jsonpath` and return the first element; `curl` a known SKU.
4. Add the `choice` for the empty result and the 404.
3. Unmarshal the file and find the item with Groovy, `body.find { it.sku == headers.sku }`; `curl` a known SKU.
4. Add the `choice` for the null result and the 404.

## Try changing

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3 changes: 2 additions & 1 deletion connect/stock-api/metadata.json
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Expand Up @@ -13,11 +13,12 @@
"setBody",
"setHeader",
"choice",
"unmarshal",
"marshal"
],
"languages": [
"constant",
"jsonpath",
"groovy",
"simple"
],
"dataformats": [
Expand Down
15 changes: 7 additions & 8 deletions connect/stock-api/stock-api.camel.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -37,16 +37,19 @@
expression:
constant:
expression: resource:file:stock.json
- unmarshal:
json:
library: Jackson
# the item of that SKU as a map, or null when there is none
- setBody:
expression:
jsonpath:
expression: "$[?(@.sku == '${header.sku}')]"
resultType: java.util.List
groovy:
expression: "body.find { it.sku == headers.sku }"
- choice:
when:
- expression:
simple:
expression: "${body.size()} == 0"
expression: "${body} == null"
steps:
- setHeader:
name: CamelHttpResponseCode
Expand All @@ -59,10 +62,6 @@
expression: '{"error": "unknown sku ${header.sku}"}'
otherwise:
steps:
- setBody:
expression:
simple:
expression: "${body[0]}"
- marshal:
json:
library: Jackson
Expand Down
4 changes: 2 additions & 2 deletions contracts/openapi-server/README.md
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Expand Up @@ -48,8 +48,8 @@ Stop it with `ctrl` + `c`.
`apiContextPath: openapi` serves the contract.
- Each operation is a `direct` route named after its `operationId`: `listStock`, `getStock`, `reserveStock`.
Path parameters arrive as headers, `sku` here; the request body is the message body.
- `lookup` is a helper route the two SKU operations share: it filters the stock file with `jsonpath` and
leaves the item, or null, as the body.
- `lookup` is a helper route the two SKU operations share: it unmarshals the stock file and finds the SKU
with Groovy, `body.find { it.sku == headers.sku }`, which leaves the item, or null, as the body.
- The contract check does not look at the values, so `reserveStock` runs `validate` on them and an
`onException` turns the failed predicate into a 400 with an error body, the status the contract promises.
- `CamelHttpResponseCode` sets 404 and 409; the bodies are the JSON the contract's `Error` schema describes.
Expand Down
2 changes: 1 addition & 1 deletion contracts/openapi-server/metadata.json
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Expand Up @@ -21,7 +21,7 @@
],
"languages": [
"simple",
"jsonpath",
"groovy",
"constant"
],
"dataformats": [
Expand Down
25 changes: 6 additions & 19 deletions contracts/openapi-server/openapi-server.camel.yaml
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Expand Up @@ -139,24 +139,11 @@
expression:
constant:
expression: resource:file:stock.json
- unmarshal:
json:
library: Jackson
# the item of that SKU as a map, or null when there is none
- setBody:
expression:
jsonpath:
expression: "$[?(@.sku == '${header.sku}')]"
resultType: java.util.List
- choice:
when:
- expression:
simple:
expression: "${body.size()} == 0"
steps:
- setBody:
expression:
simple:
expression: "${null}"
otherwise:
steps:
- setBody:
expression:
simple:
expression: "${body[0]}"
groovy:
expression: "body.find { it.sku == headers.sku }"
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