Archive for the ‘Uncategorized’ Category
Static content and webjars in Micronaut applications
Sometimes I need to add a very simple UI to my Micronaut applications. Lightweight javascript libraries such as JQuery or AngularJS are quite convenient for this purpose. Traditionally CDNs are used to reference and download these libraries at runtime, but I prefer to use webjars. This way my app will continue to work even if there is no internet connection or if certain CDN is blocked by e.g. corporate network policies.
Step 1
Add dependency to the webjar. In gradle this would look like:
runtimeOnly('org.webjars:jquery:3.5.1')Step 2
Add following configuration to application.yml
micronaut:
application:
name: myapp
router:
static-resources:
default:
paths:
- "classpath:public"
- "classpath:META-INF/resources/webjars"Step 3
Create static resources (html, js, css) under src/main/resources/public
Step 4
Reference webjar javascript library from html
<head>
<script src="jquery/3.5.1/jquery.min.js"></script>
</head>
Project release and version management using gradle and git
Two very useful Gradle plugins:
1. axion-release-plugin
https://github.com/allegro/axion-release-plugin
This plugin derives project version from tags in git repository. I use following rules in my projects:
- Start with default version 0.1.0-SNAPSHOT
- Every release of master branch increments second digit
- Production emergency fixes are done on a branch, which is created from the version tag. Such branch name must start with “hotfix-” prefix. Releasing this branch will increment 3rd digit.
- Feature branches must have “topic-” prefix. They are never released, however their version includes feature name.
To check current project version run “gradle currentVersion”
To release the project run “gradle release”
2. gradle-nexus-plugin
https://github.com/bmuschko/gradle-nexus-plugin
This plugin adds ability to upload project artifacts to nexus repository. Simply run “gradle upload”.
Example gradle.build
buildscript {
repositories {
maven {url = 'http://repo1.maven.org/maven2'}
}
}
plugins {
id 'java'
id 'pl.allegro.tech.build.axion-release' version '1.3.4'
id 'com.bmuschko.nexus' version '2.3.1'
}
scmVersion {
versionIncrementer 'incrementMinor'
branchVersionIncrementer = [
'hotfix-.*' : { c -> c.currentVersion.incrementPatchVersion() }
]
branchVersionCreator = [
'topic-.*' : 'versionWithBranch'
]
}
group 'com.jpragma.myproject'
version = scmVersion.version
repositories {
jcenter {url = 'http://jcenter.bintray.com/'}
}
dependencies {
compile 'org.slf4j:slf4j-api:1.7.21'
testCompile 'junit:junit:4.12'
}
nexus {
sign = false
repositoryUrl = 'http://localhost:8081/nexus/content/repositories/internal/'
snapshotRepositoryUrl = 'http://localhost:8081/nexus/content/repositories/internal-snapshots/'
}
Useful aliases and ENVs in cygwin .profile
alias cp=’cp -i’
alias mv=’mv -i’
alias df=’df -h’
alias du=’du -h’
alias grep=’grep –color’
alias itest=’mvn clean test verify -U’
alias ls=’ls -h –color’
alias mci=’mvn clean install -U’
alias mi=’mvn install’
alias mjr=’mvn jetty:run -o’
alias mjrwithprofile=’mvn clean jetty:run -DAPP_ENV=dev -Dspring.profiles.active=dev’
alias ps=’ps -W -a -f ux’
alias rm=’rm -i’
function xtitle {
echo -ne “\033]0;$1\007″
}
export MAVEN_OPTS_BASE=”-server -Xms128m -Xmx2048m -XX:MaxPermSize=256m”
export MAVEN_OPTS_DEBUG=”$MAVEN_OPTS_BASE -Xdebug=true -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,address=5555,server=y,suspend=n -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.port=7777″
alias mvnAllOff=’export MAVEN_OPTS=$MAVEN_OPTS_BASE’
alias mvnDebugOn=’export MAVEN_OPTS=$MAVEN_OPTS_DEBUG’
mvnDebugOn
Insert semicolons and braces in correct position
One thing that always disturbed me when editing Java source files is that you need to move your hands out of keyboard’s home row, press <End> and then type semicolon or open brace. Not anymore! I recently discovered pretty cool feature in Eclipse that automatically inserts semicolons and braces in correct positions.
Enable this option via Preferences -> Java -> Editor -> Typing dialog.
