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# JVM SIGSEGV Crash: G1GC + Lucene mmap + tmpfs Race Condition

## Симптомы
- JVM крашится с `SIGSEGV (0xb)` при интенсивной нагрузке (реиндексация Jira, Lucene indexing)
- Problematic frames:
  - `G1CMTask::make_reference_grey()+0x11b`
  - `IndexSetIterator::advance_and_next()+0x11b`
- Множество потоков крашатся одновременно (`[thread XXXX also had an error]`)
- Происходит **только на tmpfs (ramdisk)**, на обычном SSD не воспроизводится
- Чем больше CPU ядер — тем чаще крашится

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Jira Server/Data Center — Download Plugin JARs via REST API

Prerequisites

• Jira admin account (or Personal Access Token)
• curl, python3 (or jq)

1. List all plugins

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Maven Cached Resolution Failure

Problem

Maven build fails with an error like:

org.jenkins-ci:jenkins:pom:1.39 was not found in https://packages.atlassian.com/maven-public/
during a previous attempt. This failure was cached in the local repository and resolution
is not reattempted until the update interval of maven-atlassian-all-public has elapsed

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Missing Jenkins Repository for Jira 9.12.x Plugin Build

Problem

When building an Atlassian Jira plugin against Jira 9.12.x, Maven fails with:

Failed to read artifact descriptor for commons-httpclient:commons-httpclient:jar:3.1-jenkins-3
Caused by: The following artifacts could not be resolved: org.jenkins-ci:jenkins:pom:1.39

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Maven Mirror Configuration Issue with Atlassian Plugin SDK

Problem

When building an Atlassian Jira plugin, Maven fails with the following error:

Artifact com.atlassian.pom:public-pom:pom:5.0.21 is present in the local repository,
but cached from a remote repository ID that is unavailable in current build context,
verifying that is downloadable from [maven-central (https://repo.maven.apache.org/maven2, default, releases+snapshots)]

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package pmpshk.atlassian.upm;

import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.auth.BasicScheme;
import org.apache.http.impl.client.CloseableHttpClient;

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How to enable rsync through ssh on a Windows machine

1. To install the OpenSSH on the Windows machine, follow these tutorials:

   • https://hostadvice.com/how-to/how-to-install-an-openssh-server-client-on-a-windows-2016-server/
   • https://docs.microsoft.com/pt-br/windows-server/administration/openssh/openssh_overview
   • https://github.com/PowerShell/Win32-OpenSSH/wiki/Install-Win32-OpenSSH

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git rm -r --cached .
git add .
git commit -m 'git cache cleared'
git push

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JQL Syntax for the Impatient

There are a few JQL syntax bits to get you started:

• AND --- allows you to add qualifiers to a list
• != Thing --- target one thing
• is in (List, Of, Things) --- target a bunch of things (Done, Closed, Resolved) typically
• not in (List, of, Things) --- do not include a bunch of things
• -1w --- relative time. You can also use -1d for day
• "2015/3/15" --- specific dates

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GET https://flowxo.com/api/conversations/615c6b5e14fc0900a6556061%2Fc%2FMwvFx5eJp/messages?skip=0&limit=1000
Accept: application/json
Authorization: Bearer *****