== Why is this an issue?

Using ``++return++``, ``++break++``, ``++throw++``, and so on from a ``++finally++`` block suppresses the propagation of any unhandled ``++Throwable++`` which was thrown in the ``++try++`` or ``++catch++`` block.


This rule raises an issue when a jump statement (``++break++``, ``++continue++``, ``++return++``, ``++throw++``, and ``++goto++``) would force control flow to leave a ``++finally++`` block.


=== Noncompliant code example

[source,java]
----
public static void main(String[] args) {
  try {
    doSomethingWhichThrowsException();
    System.out.println("OK");   // incorrect "OK" message is printed
  } catch (RuntimeException e) {
    System.out.println("ERROR");  // this message is not shown
  }
}

public static void doSomethingWhichThrowsException() {
  try {
    throw new RuntimeException();
  } finally {
    for (int i = 0; i < 10; i ++) {
      //...
      if (q == i) {
        break; // ignored
      }
    }

    /* ... */
    return;      // Noncompliant - prevents the RuntimeException from being propagated
  }
}
----


=== Compliant solution

[source,java]
----
public static void main(String[] args) {
  try {
    doSomethingWhichThrowsException();
    System.out.println("OK");
  } catch (RuntimeException e) {
    System.out.println("ERROR");  // "ERROR" is printed as expected
  }
}

public static void doSomethingWhichThrowsException() {
  try {
    throw new RuntimeException();
  } finally {
    for (int i = 0; i < 10; i ++) {
      //...
      if (q == i) {
        break; // ignored
      }
    }

    /* ... */
  }
}
----


== Resources

* CWE - https://cwe.mitre.org/data/definitions/584[CWE-584 - Return Inside Finally Block]
* https://wiki.sei.cmu.edu/confluence/x/BTdGBQ[CERT, ERR04-J.] - Do not complete abruptly from a finally block

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