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checker

The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.
https://checkerframework.org
GNU General Public License, version 2 (GPL2), with the classpath exception
Michael Ernst Suzanne Millstein
enhances software developers checkers absence detect their lets checker your type prevent that bugs java find verify compiler make write more this includes also framework system powerful permits plug programs useful errors
Files download
File Operation
checker-3.23.0.jar download
checker-3.23.0.pom download
checker-3.23.0-sources.jar download
Apache Maven 
<dependency>
  <groupId>org.checkerframework</groupId>
  <artifactId>checker</artifactId>
  <version>3.23.0</version>
</dependency>
Gradle Groovy 
implementation 'org.checkerframework:checker:3.23.0'
Gradle Kotlin 
implementation("org.checkerframework:checker:3.23.0")
Scala SBT 
libraryDependencies += "org.checkerframework" % "checker" % "3.23.0"
Groovy Grape 
@Grapes(
  @Grab(group='org.checkerframework', module='checker', version='3.23.0')
)
Apache Ivy 
<dependency org="org.checkerframework" name="checker" rev="3.23.0" />
Leiningen 
[org.checkerframework/checker "3.23.0"]
Apache Buildr 
'org.checkerframework:checker:jar:3.23.0'
Dependencies

runtime

|-- org.checkerframework:checker-qual:3.23.0

|-- org.checkerframework:checker-util:3.23.0