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Arthas created by Alibaba is a tool that allows developers to connect to running Java applications without stopping them or suspending threads for debugging the application from the console. It offers features like monitoring invocation statistics, searching for classes and methods in the classloaders, view method invocation details (like parameters), show the stack trace of a method invocation, monitor system metrics and others. In the following examples I’m going to demonstrate some of these features applied to a running web application. ...

In Lucene 4.x there is an API to fetch index statistics for specific document’s fields. The following examples shows how to create an index with some random documents and fetch some statistics for a field afterwards .. Lucene Dependencies Just one dependency needed here .. lucene-core. I’ve added the declarations needed for Maven and SBT here .. if you’re using Gradle or Buildr you should’t have a problem to create your build file either.. ...

Show commits from another branch not contained in current branch git cherry -v otherbranch + f7d6a569bb6912aac97fce9ac92c4302863fb0d9 thecommit Cherry pick without commit git cherry-pick -n HASH Using vimdiff for diff set it via git config git config --global diff.tool vimdiff git config --global merge.tool vimdiff set it via ~/.gitconfig [diff] tool = vimdiff [merge] tool = vimdiff Using vscode as diff and mergetool You need to have the shell integration installed (code binary in PATH) ...

These are not only linux snippets but also bash snippets and snippets using tools that run under Linux, *nix or sometimes even MacOSX, I should reorder this article someday ;) Settings for more reliable bash scripts set -euo pipefail this gives us …​ -e: exit script if a single command fails -u: exit script if an unset variable is used -o pipefail: return value of a pipeline is the status of the last command to exit with a non-zero status, or zero if no command exited with a non-zero status ...