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https://issues.apache.org/jira/browse/TINKERPOP-2285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16933254#comment-16933254
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ASF GitHub Bot commented on TINKERPOP-2285:
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spmallette commented on pull request #1190: TINKERPOP-2285 Added ResponseError
in gremlin-javascript
URL: https://github.com/apache/tinkerpop/pull/1190
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> Error object is unreachable
> ---------------------------
>
> Key: TINKERPOP-2285
> URL: https://issues.apache.org/jira/browse/TINKERPOP-2285
> Project: TinkerPop
> Issue Type: Bug
> Components: javascript
> Affects Versions: 3.3.8
> Reporter: Teonna Zaragoza
> Assignee: stephen mallette
> Priority: Major
>
> In our currently application(React, node.js, Express), we are creating an
> edge between two existing nodes.
> {code:java}
> async function somethingThatQueriesGremlin() {
> try {
> const result = await theActualQuery();
> // ...
> } catch (error) {
> console.log(error); // I expect error to be useful and not a stringified
> instance of Error wrapped in an Error.
> }
> } {code}
> If the edge already exists, the error that is logged on the server is
> {code:javascript}
> Error: Server error:
> {"requestId":"e44b2c9a-9542-461b-9d1b-bc3db3f869f4","code":"ConstraintViolationException","detailedMessage":"Edge
> with id already exists: TEST|77886.105.1:NO_SIZE:0->WVN"} (499)
> at Connection._handleMessage
> (.../node_modules/gremlin/lib/driver/connection.js:265:9)
> at WebSocket._ws.on
> (.../node_modules/gremlin/lib/driver/connection.js:128:43)
> at emitOne (events.js:116:13)
> at WebSocket.emit (events.js:211:7)
> at Receiver._receiver.onmessage
> (.../node_modules/ws/lib/WebSocket.js:141:47)
> at Receiver.dataMessage (.../node_modules/ws/lib/Receiver.js:380:14)
> at Receiver.getData (.../node_modules/ws/lib/Receiver.js:330:12)
> at Receiver.startLoop (.../node_modules/ws/lib/Receiver.js:165:16)
> at Receiver.add (.../node_modules/ws/lib/Receiver.js:139:10)
> at TLSSocket._ultron.on (.../node_modules/ws/lib/WebSocket.js:138:22)
> at emitOne (events.js:116:13)
> at TLSSocket.emit (events.js:211:7)
> at addChunk (_stream_readable.js:263:12)
> at readableAddChunk (_stream_readable.js:250:11)
> at TLSSocket.Readable.push (_stream_readable.js:208:10)
> at TLSWrap.onread (net.js:607:20)
> object
> {code}
> The problem is that the actual error object with reachable keys is a string
> within another error object. The stringified object is reachable via
> err.message.
> The error comes from the driver in connection.js line 265
> {code:java}
> newError(util.format('Server error: %s
> (%d)',response.status.message,response.status.code)));
> {code}
>
>
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