[echo] compiling functional tests...
    [javac] Compiling 14 source files to /tmp/reactor-9250c55d-6500-4ca4-9f9a-f297a583588d/build/classes
    [javac] /tmp/reactor-9250c55d-6500-4ca4-9f9a-f297a583588d/src/tests/required/AccountBookTest.java:181: error: cannot find symbol
    [javac]     @Test(expected = AccountNotFoundException.class)
    [javac]                      ^
    [javac]   symbol:   class AccountNotFoundException
    [javac]   location: class AccountBookTest
    [javac] Note: /tmp/reactor-9250c55d-6500-4ca4-9f9a-f297a583588d/src/tests/required/AccountBookTest.java uses unchecked or unsafe operations.
    [javac] Note: Recompile with -Xlint:unchecked for details.
    [javac] 1 error
    [javac] Compile failed; see the compiler error output for details.