Install instruction:: save your time

Install instruction:: save your time

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Python related:

install lxml on win10:

1. download wheel from

choose the right version corresponding to your python version, example: cp37 == python3.7

so in my case is lz4‑2.0.2‑cp37‑cp37m‑win32.whl

2. open cmd or powershell

pip install lz4‑2.0.2‑cp37‑cp37m‑win32.whl


linux related:

Error: no DISPLAY environment variable specified

ssh -Y if using cygwin

or tick up ‘forward x11’ if using putty


java related:


maven unknown lifecycle phase exec

Don’t use powershell , use cmd instead!!!!!!!

The forked VM terminated without saying properly goodbye. VM crash or System.exit called

port occupied, kill it

compile error

mvn clean install

how to debug:

mvnDebug -DforkCount=0 test  with remote java application listening


mvn -Dmaven.surefire.debug test


##gradle with intellj

how to debug:

set delegate to intellj

compile error, try gradlew build in cmd first