src/main/protocol-impl/java/com/mysql/cj/protocol/a/authentication/MysqlNativePasswordPlugin.java [40:92]:
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    private Protocol<NativePacketPayload> protocol = null;
    private MysqlCallbackHandler usernameCallbackHandler = null;
    private String password = null;

    @Override
    public void init(Protocol<NativePacketPayload> prot, MysqlCallbackHandler cbh) {
        this.protocol = prot;
        this.usernameCallbackHandler = cbh;
    }

    @Override
    public void destroy() {
        reset();
        this.protocol = null;
        this.usernameCallbackHandler = null;
        this.password = null;
    }

    @Override
    public String getProtocolPluginName() {
        return PLUGIN_NAME;
    }

    @Override
    public boolean requiresConfidentiality() {
        return false;
    }

    @Override
    public boolean isReusable() {
        return true;
    }

    @Override
    public void setAuthenticationParameters(String user, String password) {
        this.password = password;
        if (user == null && this.usernameCallbackHandler != null) {
            // Fall back to system login user.
            this.usernameCallbackHandler.handle(new UsernameCallback(System.getProperty("user.name")));
        }
    }

    @Override
    public boolean nextAuthenticationStep(NativePacketPayload fromServer, List<NativePacketPayload> toServer) {
        toServer.clear();

        NativePacketPayload packet = null;

        String pwd = this.password;

        if (fromServer == null || pwd == null || pwd.length() == 0) {
            packet = new NativePacketPayload(new byte[0]);
        } else {
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src/main/protocol-impl/java/com/mysql/cj/protocol/a/authentication/MysqlOldPasswordPlugin.java [42:94]:
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    private Protocol<NativePacketPayload> protocol = null;
    private MysqlCallbackHandler usernameCallbackHandler = null;
    private String password = null;

    @Override
    public void init(Protocol<NativePacketPayload> prot, MysqlCallbackHandler cbh) {
        this.protocol = prot;
        this.usernameCallbackHandler = cbh;
    }

    @Override
    public void destroy() {
        reset();
        this.protocol = null;
        this.usernameCallbackHandler = null;
        this.password = null;
    }

    @Override
    public String getProtocolPluginName() {
        return PLUGIN_NAME;
    }

    @Override
    public boolean requiresConfidentiality() {
        return false;
    }

    @Override
    public boolean isReusable() {
        return true;
    }

    @Override
    public void setAuthenticationParameters(String user, String password) {
        this.password = password;
        if (user == null && this.usernameCallbackHandler != null) {
            // Fall back to system login user.
            this.usernameCallbackHandler.handle(new UsernameCallback(System.getProperty("user.name")));
        }
    }

    @Override
    public boolean nextAuthenticationStep(NativePacketPayload fromServer, List<NativePacketPayload> toServer) {
        toServer.clear();

        NativePacketPayload packet = null;

        String pwd = this.password;

        if (fromServer == null || pwd == null || pwd.length() == 0) {
            packet = new NativePacketPayload(new byte[0]);
        } else {
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