Jump statements must not be used within `finally` blocksJAVA-E1007

If jump statements such as break, continue, return or throw are used within a finally block, any exception thrown in the try or catch blocks encountered before will be ignored, and information regarding the underlying error which caused the exception will be lost.

Avoid using such statements to jump outside a finally block.

finally blocks will run regardless of whether an exception occurred or not. Because of this, any exception thrown within a try or catch block associated with a finally block will not be propagated until the finally block has executed. If any control flow statements are used to exit out of the finally block before completion, the previously thrown exception will be ignored and execution will continue as if there was no exception.

Bad Practice

outer: while (...) {
    try {
        // ...
    } catch (...) {
        // ...
    } finally {
        // ...

        // Using return will discard the exception and return immediately,
        // effectively returning successfully.
        if (condition) return;


        // Even break and continue will ignore any exception when encountered within a finally block.
        if (something) break;
        else if (somethingElse) continue;

        for (int i = 0; i < MAX; i++) {
            // ...

            if (thing) break outer; // Don't jump to labels outside the finally block!
        }


        // Throwing an exception in a finally block will cause any
        // previous exception to be ignored and forgotten.
        throw new RuntimeException(...);
    }
}

Recommended

Avoid using control flow statements to jump out of finally blocks.

Exceptions

It is okay to use jump statements when they keep control flow within the finally block:

try { ... } catch (...) { ... } finally {

    inner: while(...) {
        for (...) {

            if (thing) break; // this is okay.

            else if (otherThing) break inner; // this is also okay.
        }
    }

}