protected void checkRequiredState()

in src/main/java/org/apache/maven/shared/jarsigner/JarSignerCommandLineBuilder.java [138:146]


    protected void checkRequiredState() throws IOException {
        if (logger == null) {
            throw new IllegalStateException("A logger instance is required.");
        }

        if (jarSignerFile == null) {
            throw new IllegalStateException("A jarSigner file is required.");
        }
    }