SneakyThrow

SneakyThrow is a Java library to ignore checked exceptions. You can integrate it using maven:

<dependency>
  <groupId>com.rainerhahnekamp</groupId>
  <artifactId>sneakythrow</artifactId>
  <version>1.2.0</version>
</dependency>

Usage

Without SneakyThrow:

URL url;
try {
  url = new URL("https://www.hahnekamp.com");
} catch (MalformedURLException mue) {
  throw new RuntimeException(mue);
}

With SneakyThrow:

URL url = sneak(() -> new URL("https://www.hahnekamp.com"));

Usage with Java 8 Streams

private URL createURL(String url) throws MalformedURLException {
  return new URL(url);
}

The function above used within a Stream without SneakyThrow:

Stream
  .of("https://www.hahnekamp.com", "https://www.austria.info")
  .map(url -> {
    try {
      return this.createURL(url);
    } catch (MalformedURLException mue) {
      throw new RuntimeException(mue);
    }
  })  
  .collect(Collectors.toList());

Again with SneakyThrow:

Stream
  .of("https://www.hahnekamp.com", "https://www.austria.info")
  .map(sneaked(this::createURL))
  .collect(Collectors.toList());

The static method sneaked wraps each function, that has the same signature as a functional interface (java.util.functional).

Please note the difference between sneak and sneaked.

How it works

This project is heavily influenced by ThrowingFunction.

In SneakyThrow, each functional interface, defined in java.util.function, has an equivalent one with the same signature. The only difference is, that these "Sneaky Functional Interfaces" throw exceptions. This gives us the possibility to write lambdas or similar code that also throws exceptions.

Both sneak and sneaked wrap the passed "Sneaky Functional Interfaces" into a try/catch clause and return the equivalent java.util.function interface. In the case of sneak, execution and the return of the result is done immediately.