Why is the initialization of LTeX failing (download/extraction/run of Java failed)?

[Shanggao-lab]

Hi, there. I'm a tex user and want to use this popular grammar checking extension on VScode, but after I reloading VScode and opening a tex file, it reports Error: The download/extraction/run of Java failed!

I've tried three ways of installation:

• install from VScode Extension Marketplace
• download the release version of Ltex and install it from Extensions: Install from VSIX
• download ltex-ls and AdoptOpenJDK and set their location in LTEX setting respectively, where I tried version 8.1.1 and 8.1.0 of ltex-ls with LTEX version 8.1.1

However, all three ways failed with the initialization report Error: The download/extraction/run of Java failed!

Following is output report:

2020-12-09T03:14:36.791Z Info: Setting LTeX UI language to 'zh-cn'.
2020-12-09T03:14:36.791Z Info: Loading i18n messages...
2020-12-09T03:14:36.792Z Info: Loading default i18n messages...
2020-12-09T03:14:36.794Z Info: 
2020-12-09T03:14:36.795Z Info: ltex.ltex-ls.path set to 'D:\SetUps\ltex-ls-8.1.0\ltex-ls-8.1.0'.
2020-12-09T03:14:36.795Z Info: 
2020-12-09T03:14:36.795Z Info: ltex.java.path set to 'C:\Program Files\AdoptOpenJDK\jdk-11.0.9.101-hotspot\'.
2020-12-09T03:14:36.795Z Info: Using ltex-ls from 'D:\SetUps\ltex-ls-8.1.0\ltex-ls-8.1.0'.
2020-12-09T03:14:36.795Z Info: Using Java from 'C:\Program Files\AdoptOpenJDK\jdk-11.0.9.101-hotspot\'.
2020-12-09T03:14:37.310Z Info: Testing ltex-ls...
2020-12-09T03:14:37.310Z Info:   Command: "D:\\SetUps\\ltex-ls-8.1.0\\ltex-ls-8.1.0\\bin\\ltex-ls.bat"
2020-12-09T03:14:37.310Z Info:   Arguments: ["--version"]
2020-12-09T03:14:37.310Z Info:   env['JAVA_HOME']: "C:\\Program Files\\AdoptOpenJDK\\jdk-11.0.9.101-hotspot\\"
2020-12-09T03:14:37.310Z Info:   env['JAVA_OPTS']: "-Xms64m -Xmx512m"
2020-12-09T03:14:37.904Z Error: Test failed.
2020-12-09T03:14:37.904Z Info: ltex-ls did not print expected version information to stdout.
2020-12-09T03:14:37.904Z Info: stdout of ltex-ls:
2020-12-09T03:14:37.904Z Info: Active code page: 65001
2020-12-09T03:14:37.904Z Info: {
2020-12-09T03:14:37.904Z Info:   "ltex-ls": "8.1.0",
2020-12-09T03:14:37.904Z Info:   "java": "11.0.9.1"
2020-12-09T03:14:37.904Z Info: }
2020-12-09T03:14:37.904Z Info: 
2020-12-09T03:14:37.904Z Info: stderr of ltex-ls:
2020-12-09T03:14:37.904Z Info: 
2020-12-09T03:14:37.912Z Info: 
2020-12-09T03:14:37.912Z Info: ltex.java.path set to 'C:\Program Files\AdoptOpenJDK\jdk-11.0.9.101-hotspot\'.
2020-12-09T03:14:37.912Z Info: Using ltex-ls from 'D:\SetUps\ltex-ls-8.1.0\ltex-ls-8.1.0'.
2020-12-09T03:14:37.912Z Info: Using Java from 'C:\Program Files\AdoptOpenJDK\jdk-11.0.9.101-hotspot\'.
2020-12-09T03:14:37.913Z Info: Testing ltex-ls...
2020-12-09T03:14:37.913Z Info:   Command: "D:\\SetUps\\ltex-ls-8.1.0\\ltex-ls-8.1.0\\bin\\ltex-ls.bat"
2020-12-09T03:14:37.913Z Info:   Arguments: ["--version"]
2020-12-09T03:14:37.913Z Info:   env['JAVA_HOME']: "C:\\Program Files\\AdoptOpenJDK\\jdk-11.0.9.101-hotspot\\"
2020-12-09T03:14:37.913Z Info:   env['JAVA_OPTS']: "-Xms64m -Xmx512m"
2020-12-09T03:14:38.700Z Error: Test failed.
2020-12-09T03:14:38.700Z Info: ltex-ls did not print expected version information to stdout.
2020-12-09T03:14:38.700Z Info: stdout of ltex-ls:
2020-12-09T03:14:38.700Z Info: Active code page: 65001
2020-12-09T03:14:38.700Z Info: {
2020-12-09T03:14:38.700Z Info:   "ltex-ls": "8.1.0",
2020-12-09T03:14:38.700Z Info:   "java": "11.0.9.1"
2020-12-09T03:14:38.700Z Info: }
2020-12-09T03:14:38.700Z Info: 
2020-12-09T03:14:38.700Z Info: stderr of ltex-ls:
2020-12-09T03:14:38.700Z Info: 
2020-12-09T03:14:38.700Z Info: 
2020-12-09T03:14:38.700Z Info: ltex.java.path set to 'C:\Program Files\AdoptOpenJDK\jdk-11.0.9.101-hotspot\'.
2020-12-09T03:14:38.700Z Info: Using ltex-ls from 'D:\SetUps\ltex-ls-8.1.0\ltex-ls-8.1.0'.
2020-12-09T03:14:38.700Z Info: Using Java from 'C:\Program Files\AdoptOpenJDK\jdk-11.0.9.101-hotspot\'.
2020-12-09T03:14:38.701Z Info: Testing ltex-ls...
2020-12-09T03:14:38.701Z Info:   Command: "D:\\SetUps\\ltex-ls-8.1.0\\ltex-ls-8.1.0\\bin\\ltex-ls.bat"
2020-12-09T03:14:38.701Z Info:   Arguments: ["--version"]
2020-12-09T03:14:38.701Z Info:   env['JAVA_HOME']: "C:\\Program Files\\AdoptOpenJDK\\jdk-11.0.9.101-hotspot\\"
2020-12-09T03:14:38.701Z Info:   env['JAVA_OPTS']: "-Xms64m -Xmx512m"
2020-12-09T03:14:39.384Z Error: Test failed.
2020-12-09T03:14:39.384Z Info: ltex-ls did not print expected version information to stdout.
2020-12-09T03:14:39.384Z Info: stdout of ltex-ls:
2020-12-09T03:14:39.384Z Info: Active code page: 65001
2020-12-09T03:14:39.384Z Info: {
2020-12-09T03:14:39.384Z Info:   "ltex-ls": "8.1.0",
2020-12-09T03:14:39.384Z Info:   "java": "11.0.9.1"
2020-12-09T03:14:39.384Z Info: }
2020-12-09T03:14:39.384Z Info: 
2020-12-09T03:14:39.384Z Info: stderr of ltex-ls:
2020-12-09T03:14:39.384Z Info: 
2020-12-09T03:14:39.384Z Error: The download/extraction/run of Java failed!
2020-12-09T03:14:39.384Z Info: You might want to try offline installation, see https://valentjn.github.io/vscode-ltex/docs/installation-and-usage.html#offline-installation.

I don't know why it doesn't work. If necessary, I could provide other log files or something else. Please give me some instructions to fix it. Many thanks!

[valentjn]

The problem is the Active code page: 65001 in the output where it says stdout of ltex-ls. The curly braces and the things in between are printed by ltex-ls (so it is working correctly), but the Active code page: 65001 is not from ltex-ls. vscode-ltex expects the stdout of ltex-ls to be JSON, and it fails to parse this particular stdout because it's not valid JSON.

This Super User question suggests that you have set somewhere that the command chcp 65001 is run every time a batch file is run/a command prompt is opened, as Active code page: 65001 is exactly what chcp 65001 prints when being run in a command prompt.

The accepted answer in that Super User question shows that a command can be run automatically on startup of every command prompt if you add the command to the registry key HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor\Autorun. My guess is that you have a chcp 65001 somewhere in there. If you do, replace it with @chcp 65001>nul to suppress its output while keeping its function.

[Shanggao-lab]

Thanks for your kind answer. The problem is exactly due to chcp 65001, and your solution really works. I forgot that I set the registry key before to solve some encoding problem.