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Maven Compile Npm Failure

docs/en/FAQ/maven-compile-npm-failure.md

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Problem： Maven compilation failure with error such as Error: not found: python2

When you compile the project via Maven, it fails at module apm-webapp and the following error occurs.

Pay attention to keywords such as node-sass and Error: not found: python2.

[INFO] > [email protected] postinstall C:\XXX\skywalking\skywalking-ui\node_modules\node-sass
[INFO] > node scripts/build.js

[ERROR] gyp verb check python checking for Python executable "python2" in the PATH
[ERROR] gyp verb `which` failed Error: not found: python2
[ERROR] gyp verb `which` failed     at getNotFoundError (C:\XXX\skywalking\skywalking-ui\node_modules\which\which.js:13:12)
[ERROR] gyp verb `which` failed     at F (C:\XXX\skywalking\skywalking-ui\node_modules\which\which.js:68:19)
[ERROR] gyp verb `which` failed     at E (C:\XXX\skywalking\skywalking-ui\node_modules\which\which.js:80:29)
[ERROR] gyp verb `which` failed     at C:\XXX\skywalking\skywalking-ui\node_modules\which\which.js:89:16
[ERROR] gyp verb `which` failed     at C:\XXX\skywalking\skywalking-ui\node_modules\isexe\index.js:42:5
[ERROR] gyp verb `which` failed     at C:\XXX\skywalking\skywalking-ui\node_modules\isexe\windows.js:36:5
[ERROR] gyp verb `which` failed     at FSReqWrap.oncomplete (fs.js:152:21)

[ERROR] gyp verb `which` failed   code: 'ENOENT' }
[ERROR] gyp verb check python checking for Python executable "python" in the PATH
[ERROR] gyp verb `which` succeeded python C:\Users\XXX\AppData\Local\Programs\Python\Python37\python.EXE
[ERROR] gyp ERR! configure error 
[ERROR] gyp ERR! stack Error: Command failed: C:\Users\XXX\AppData\Local\Programs\Python\Python37\python.EXE -c import sys; print "%s.%s.%s" % sys.version_info[:3];
[ERROR] gyp ERR! stack   File "<string>", line 1
[ERROR] gyp ERR! stack     import sys; print "%s.%s.%s" % sys.version_info[:3];
[ERROR] gyp ERR! stack                                ^
[ERROR] gyp ERR! stack SyntaxError: invalid syntax
[ERROR] gyp ERR! stack 
[ERROR] gyp ERR! stack     at ChildProcess.exithandler (child_process.js:275:12)
[ERROR] gyp ERR! stack     at emitTwo (events.js:126:13)
[ERROR] gyp ERR! stack     at ChildProcess.emit (events.js:214:7)
[ERROR] gyp ERR! stack     at maybeClose (internal/child_process.js:925:16)
[ERROR] gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:209:5)
[ERROR] gyp ERR! System Windows_NT 10.0.17134
......
[INFO] server-starter-es7 ................................. SUCCESS [ 11.657 s]
[INFO] apm-webapp ......................................... FAILURE [ 25.857 s]
[INFO] apache-skywalking-apm .............................. SKIPPED
[INFO] apache-skywalking-apm-es7 .......................... SKIPPED

Reason

The error has nothing to do with SkyWalking.
According to the issue here (https://github.com/sass/node-sass/issues/1176), if you live in countries where requesting resources from GitHub and npmjs.org runs slow, some precompiled binaries for dependency node-sass would fail to be downloaded during npm install, and npm would try to compile them itself. That's why python2 is needed.

Resolution

1. Use mirror. For instance, if you're in China, please edit skywalking\apm-webapp\pom.xml as follows.

Find

<configuration>  
 <arguments>install --registry=https://registry.npmjs.org/</arguments>  
</configuration>

Replace it with

<configuration>  
 <arguments>install --registry=https://registry.npmmirror.com/ --sass_binary_site=https://npmmirror.com/mirrors/node-sass/</arguments>  
</configuration>

2. Get a sufficiently powerful VPN.