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forceClosable

This project is an error-prone plugin to for the usage of Try-with-Resources (TwR).

The project adds to your runtime a single empty interface ForcingClosable that extends AutoClosable.

When activating the compiler plugin, all usage of instances of ForcingClosable that are not directly in a TwR clause will fail at compiletime:

import java.util.concurrent.atomic.AtomicReference;

public class Test
        implements ForcingClosable {
    public void close() {}

    public static void main(String[] args) {
        try (var x0 = new Test()) {
            // Okay
        }
        var x1 = new Test(); // Fail, not TwR clause
        try (var x2 = new AtomicReference<>(new Test()).get()) {
            // Fail, the instance of Test is not directly in the clause
        }
    }
}

In addition, you can use the compiler parameter -XepOpt:ForcingTry to make existing classes to act similarly to how ForcingClosable works. The value of the flag is comma seperated list of canonical names.

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