https://github.com/easymock/objenesis
Okay, it's pretty easy to instantiate objects in Java through standard reflection. However there are many cases where you need to go beyond what reflection provides. For example, if there's no public constructor, you want to bypass the constructor code, or set final fields. There are numerous clever (but fiddly) approaches to getting around this and this library provides a simple way to get at them. You will find the official site here.
https://github.com/easymock/objenesis
Last synced: 5 months ago
JSON representation
Okay, it's pretty easy to instantiate objects in Java through standard reflection. However there are many cases where you need to go beyond what reflection provides. For example, if there's no public constructor, you want to bypass the constructor code, or set final fields. There are numerous clever (but fiddly) approaches to getting around this and this library provides a simple way to get at them. You will find the official site here.
- Host: GitHub
- URL: https://github.com/easymock/objenesis
- Owner: easymock
- License: apache-2.0
- Created: 2013-07-16T16:08:53.000Z (about 13 years ago)
- Default Branch: master
- Last Pushed: 2026-03-06T22:18:26.000Z (5 months ago)
- Last Synced: 2026-03-13T05:13:55.789Z (5 months ago)
- Language: Java
- Homepage: objenesis.org
- Size: 4.14 MB
- Stars: 628
- Watchers: 31
- Forks: 97
- Open Issues: 7
-
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- Funding: .github/FUNDING.yml
- License: LICENSE.txt
- Security: SECURITY.md
- Support: SupportedJVMs.md
Awesome Lists containing this project
- fucking-awesome-java - Objenesis - 2.0</kbd> 🟢<br>Allows dynamic instantiation without default constructor, e.g. constructors which have required arguments, side effects or throw exceptions. (Projects)
README
# Objenesis
Objenesis is a library dedicated to bypass the constructor when creating an object. On any JVM there is.
You can find the website and user documentation at [objenesis.org](https://objenesis.org).
# Developer information
## Project status
[](https://github.com/easymock/objenesis/actions/workflows/ci.yml?query=branch%3Amaster)
[](https://maven-badges.herokuapp.com/maven-central/org.objenesis/objenesis)
## Environment setup
I'm using:
- Maven 3.9.11
- IntelliJ Ultimate 2025.3.1 (thanks to JetBrains for the license) (it should also work with Eclipse)
To configure your local workspace:
- Import the Maven parent project to Eclipse or IntelliJ
- Import the Eclipse formatting file `objenesis-formatting.xml` (usable in Eclipse or IntelliJ)
## To build with Maven
There are two different levels of build.
### Build without any active profile
It is a basic compilation of the application.
`mvn install`
### Full build
This build will create the source and javadoc jars and run spotbugs.
`mvn install -Pfull`
## To run special builds
### Run the Android TCK
#### Install required tools:
##### MacOs / *nix
- Install the Android SDK (`brew cask install android-sdk`)
- Install `platform-tools` and `build-tools` using the sdkmanager (`sdkmanager "platform-tools" "build-tools"`)
- Add an `ANDROID_HOME` to target the Android SDK (`export ANDROID_HOME=$(realpath $(echo "$(dirname $(readlink $(which sdkmanager)))/../.."))`)
##### Windows
- [Install Android Studio](https://developer.android.com/studio)
- Launch studio and install SDK and emulator
- Add an `ANDROID_HOME` to environmental variables (path used to install SDK on previous step)
#### Run
- Configure a device (real or simulated) and launch it (use **API 26**, after that it asks for a signature, that isn't supported yet)
- Activate the debug mode if it's a real device
- `mvn package -Pandroid`
### Run the benchmarks
```bash
mvn package -Pbenchmark
cd benchmark
./launch.sh
```
### Generate the website
`mvn package -Pwebsite`
## To update the versions
- `mvn versions:set -DnewVersion=X.Y -Pall`
- `mvn versions:commit -Pall` if everything is ok, `mvn versions:revert -Pall` otherwise
## Configure to deploy to the Sonatype maven repository
- You will first need to add something like this to your settings.xml
```xml
ossrh
sonatypeuser
sonatypepassword
```
- Then follow the [instructions](https://central.sonatype.org/pages/working-with-pgp-signatures.html) from the site below to create your key to sign the deployed items
## To check dependencies and plugins versions
`mvn versions:display-dependency-updates versions:display-plugin-updates -Pall`
## To upgrade the Maven wrapper
`mvn wrapper:wrapper`
## To update the license
`mvn validate license:format -Pall`
## To run modernizer
`mvn modernizer:modernizer -Pall`
## Reproducible build
We make sure a build will always create the same result with done from the same sources.
It follows these [guidelines](https://maven.apache.org/guides/mini/guide-reproducible-builds.html).
Useful commands:
```bash
# Checks that all plugins are compatible
mvn artifact:check-buildplan -Pfull,all
# Build and install the artifact
mvn clean install -Pfull,all
# Build and compare the artifact with the installed one
mvn clean verify artifact:compare -Pfull,all
```
## To release
* Add the release notes in `website/site/content/notes.html` You use this code to generate it. If you have more than 100 items, do it again with `&page=2`
```bash
# Get the milestone matching the version
version=$(mvn help:evaluate -Dexpression=project.version -q -DforceStdout | cut -d'-' -f1)
milestone=$(curl -s "https://api.github.com/repos/easymock/objenesis/milestones" | jq ".[] | select(.title==\"$version\") | .number")
echo "
Version $version ($(date '+%Y-%m-%d'))
"
echo
echo "- "
- " + .title + " (#" + (.number|tostring) + ") "'
curl -s "https://api.github.com/repos/easymock/objenesis/issues?milestone=${milestone}&state=all&per_page=100" | jq -r '.[] | "
echo "
```
* Make sure you have Java 9+ in the path
* Launch `./deploy.sh`
* Answer the questions (normally, just acknowledge the proposed default)
* Follow the instructions
If something fails, and you need to rollback a bit, the following commands might help:
```bash
mvn release:rollback -Pall
git tag -d $version
git push origin :refs/tags/$version
git reset --hard HEAD~2
```
If you find something went wrong you can drop the staging repository with `mvn nexus-staging:drop`.
## Deploy the website
* Make sure the pom is at the version you want to release
* Launch `./deploy-website.sh`