Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

Cannot read property 'Unnecessary' of undefined

See original GitHub issue

I’m sending this message on the LSP:

[Trace - 9:25:42 AM] Received notification 'textDocument/publishDiagnostics'.
Params: {
    "uri": "file:///Users/georgefraser/Documents/java-language-server/src/test/test-project/workspace/src/org/javacs/warn/Unused.java",
    "diagnostics": [
        {
            "range": {
                "start": {
                    "line": 23,
                    "character": 4
                },
                "end": {
                    "line": 23,
                    "character": 33
                }
            },
            "severity": 4,
            "code": "unused",
            "message": "`UnusedClass` is not used",
            "tags": [
                1
            ]
        },
        {
            "range": {
                "start": {
                    "line": 12,
                    "character": 8
                },
                "end": {
                    "line": 12,
                    "character": 32
                }
            },
            "severity": 2,
            "code": "unused",
            "message": "`unusedLocalInLambda` is not used",
            "tags": [
                1
            ]
        },
        {
            "range": {
                "start": {
                    "line": 15,
                    "character": 4
                },
                "end": {
                    "line": 17,
                    "character": 5
                }
            },
            "severity": 4,
            "code": "unused",
            "message": "`unusedMethod` is not used",
            "tags": [
                1
            ]
        },
        {
            "range": {
                "start": {
                    "line": 6,
                    "character": 8
                },
                "end": {
                    "line": 6,
                    "character": 28
                }
            },
            "severity": 2,
            "code": "unused",
            "message": "`unusedLocal` is not used",
            "tags": [
                1
            ]
        },
        {
            "range": {
                "start": {
                    "line": 9,
                    "character": 4
                },
                "end": {
                    "line": 9,
                    "character": 30
                }
            },
            "severity": 2,
            "code": "unused",
            "message": "`unusedPrivate` is not used",
            "tags": [
                1
            ]
        },
        {
            "range": {
                "start": {
                    "line": 21,
                    "character": 4
                },
                "end": {
                    "line": 21,
                    "character": 29
                }
            },
            "severity": 4,
            "code": "unused",
            "message": "`<init>` is not used",
            "tags": [
                1
            ]
        }
    ]
}

But I’m not seeing any green squigglies or faded backgrounds, and I’m seeing this error in the VSCode debug console:

Notification handler 'textDocument/publishDiagnostics' failed with message: Cannot read property 'Unnecessary' of undefined

I’m running version 1.31.1 of VSCode. This is what my package.json looks like:

{
    "name": "vscode-javac",
    "displayName": "Java Language Support",
    "description": "Java support using the Java Compiler API",
    "icon": "icon.png",
    "version": "0.2.14",
    "publisher": "georgewfraser",
    "repository": {
        "type": "git",
        "url": "https://github.com/georgewfraser/java-language-server"
    },
    "license": "MIT",
    "engines": {
        "vscode": "^1.31.1"
    },
    "categories": [
        "Programming Languages",
        "Linters"
    ],
    "keywords": [
        "java"
    ],
    "activationEvents": [
        "onLanguage:java"
    ],
    "main": "./out/lib/extension",
    "contributes": {
        /* removed */
    },
    "scripts": {
        "vscode:prepublish": "npm run compile",
        "compile": "tsc -p ./",
        "watch": "tsc -watch -p ./",
        "postinstall": "node ./node_modules/vscode/bin/install",
        "test": "npm run compile && node ./node_modules/vscode/bin/test"
    },
    "dependencies": {
        "vscode-languageclient": "^5.3.0-next.1"
    },
    "devDependencies": {
        "typescript": "^3.3.3333",
        "vscode": "^1.1.21",
        "@types/node": "^10.3.3",
        "@types/mocha": "^2.2.42"
    }
}