FortEE

FortEE is a Jakarta EE / Java EE fault-tolerance guard leveraging the Optional pattern. Its power lies in its simplicity. On methods returning Optional, a @Failsafe annotation can be placed. Any uncaught exceptional states are then converted into an Optional.empty(). Synchronous or asynchronous invocation is not enforced.

• Simple and fast
• Startup-time check
• Tiny in size
• Compatible with Jakarta EE 8, requires Java EE 7

Maven

<dependency>
    <groupId>com.github.pscheidl</groupId>
    <artifactId>fortee</artifactId>
    <version>1.2.0</version>
</dependency>

Gradle

compile 'com.github.pscheidl:fortee:1.2.0'

Release notes

• Released on 14th of June 2020
• The @Semisafe annotation ignored exceptions not only listed as a value of that annotation, but also exceptions directly specified in the mehod's definition, e.g. public Optional<String> doSomething() throws UnsupportedOperationException will let the UnsupportedOperationException through.
• Test suite ran against WildFly 20.0.0-Final.

How it works ?

For more information, please visit FortEE wikipedia.

Guard against all checked and unchecked exceptions.

@Named
public class ServiceImplementation implements SomeService {

// Will return Optional.empty()
@Failsafe
public Optional<String> maybeFail(){
  throw new RuntimeException("Failed on purpose");
}

}

Guard against all exceptions but the declared ones, or the ones listed in the @Semisafe annotation..

@Named
public class ServiceImplementation implements SomeService {

// Will end with RuntimeException
@Semisafe
public Optional<String> maybeFail() throws RuntimeException {
  throw new RuntimeException("Failed on purpose");
}

}

Alternatively, the exception to be let through can be specified inside the @Semisafe annotation.

@Named
public class ServiceImplementation implements SomeService {

// Will end with RuntimeException
@Semisafe({RuntimeException.class})
public Optional<String> maybeFail(){
  throw new RuntimeException("Failed on purpose");
}

}