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我正在使用 YAWL 4 开发应用程序。我需要将小码添加到自动化任务中。我编写了一个 java 类并按照各种教程添加了它，但没有任何效果。YAWL 引擎日志给出了一个错误，但它只是说“错误加载 codelet x”而没有任何细节。我检查了 YAWL 默认小码以寻找错误，但没有出现任何错误（我只是没有实现所有方法，可能是这样吗？）。这是我的代码：

public class PrepareDataTaskCodelet extends AbstractCodelet {

    private Connection connection;
    private Statement statement;
    private PreparedStatement preparedStatement;
    private ResultSet resultSet;
    private String user;
    private String password;
    private String getAllAppuser;
    private String getAllDocument;
    private String getAllRequest;
    private String getAllRole;
    private String tempQuery;
    private Element inData;
    private List<YParameter> inParams;
    private List<YParameter> outParams;
    private boolean cancelled;


    public PrepareDataTaskCodelet() {
        // TODO Auto-generated constructor stub
        super();
         connection = null;
            statement = null;
            preparedStatement = null;
            resultSet = null;
            user = null;
            password = null;
            tempQuery = null;
    }

      private ResultSet getSingleAppuser(String field, String data) throws SQLException{

            tempQuery = getAllAppuser + "WHERE " + field + " = " + data;
            connection.prepareStatement(tempQuery);
            resultSet = preparedStatement.executeQuery();
            return resultSet;
        }

        // controlla se è presente appuser con username e password. ritorna false se non viene trovato alcun appuser, true altrimenti
        public boolean checkAppuser(String username, String password) throws SQLException{

            tempQuery = getAllAppuser + "WHERE username = " + username + "AND password = " + password;
            connection.prepareStatement(tempQuery);
            resultSet = preparedStatement.executeQuery();

            return (resultSet.first()); 
        }

     public void initConnection() throws Exception { // starts connection
            try {

                    Class.forName("com.mysql.jdbc.Driver");               
                    connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/yawlConnection","root","root"); //default connection values

                } finally {}
        }

    public PrepareDataTaskCodelet(String desc) {
        super(desc);
        // TODO Auto-generated constructor stub
    }


    @Override   // TODO assegnare paramentri in ingresso (user e pw)
    public Element execute(Element inData, List<YParameter> inParams, List<YParameter> outParams)
            throws CodeletExecutionException {
        // TODO Auto-generated method stub
           setInputs(inData, inParams, outParams);
        String username = "";
        String password = "";
        boolean isValidUser = false;

         username = (String) getParameterValue("username");
         password = (String) getParameterValue("password");

         try {
            initConnection();
            isValidUser = checkAppuser(username, password);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

         setParameterValue("isValidUser", String.valueOf(isValidUser));

        return getOutputData();
    }

    protected void setInputs(Element inData, List<YParameter> inParams, List<YParameter> outParams)
      {
        this.inData = inData;
        this.inParams = inParams;
        this.outParams = outParams;
      }

    public void cancel()
      {
        this.cancelled = true;
      }

      public List<YParameter> getRequiredParams() { // corretto
            List<YParameter> params = new ArrayList<YParameter>();

            YParameter param1 = new YParameter(null, YParameter._INPUT_PARAM_TYPE);
            param1.setDataTypeAndName("String", "username", XSD_NAMESPACE);
            param1.setDocumentation("appuser username");
            params.add(param1);

            YParameter param2 = new YParameter(null, YParameter._INPUT_PARAM_TYPE);
            param2.setDataTypeAndName("String", "password", XSD_NAMESPACE);
            param2.setDocumentation("appuser password");
            params.add(param2);

            YParameter param3 = new YParameter(null, YParameter._OUTPUT_PARAM_TYPE);
            param3.setDataTypeAndName("boolean", "isValidUser", XSD_NAMESPACE);
            param3.setDocumentation("check if current user has valid login data");
            params.add(param3);
            return params;
        }
}

我注意到 yawl 使用 .class 文件作为小码，但我的小码是一个 .java 文件，所以我尝试移植它，但没有成功。有人对 Yawl 4 小码有经验吗？或者，有人可以告诉我如何使用 .class 文件而不是 .java 吗？

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1 回答 1

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我自己发现的。类使用的库（java 默认除外）必须放在与 .class 文件相同的文件夹中。这足以让工作流编辑器注意到我的 codelet。

于 2017-03-17T17:19:39.150 回答