Bean Shell 编程指南

什么是BeanShell？

Joget 将Bean Shell实现提供为几个插件类型。请参考用法部分。
BeanShell是一个小型可嵌入的Java源解释器，具有Java编写的对象脚本语言特性。
BeanShell在运行时动态执行标准Java语法。
通过使用BeanShell插件，您可以在插件配置中键入有效的Java代码，并在触发插件时执行该语句。
不需要编译

代码语法如何？

支持JDK的标准JAVA语法
使用Joget使用的所有库。有关详细信息，请参阅发行安装程序/软件包中的NOTICE.txt。
使用所有的 Joget Workflow Utility and Service Methods.
使用 Hash Variable.

用法

Use as Form Load Binder

Injected Variables:

- element - Element that this binder is tie to. (org.joget.apps.form.model.Element)
- primaryKey - The primary key provided by the element to load data. (java.lang.String)
- formData - The data holder of the whole form. (org.joget.apps.form.model.FormData)

Expected Return Object:

- An org.joget.apps.form.model.FormRowSet object which contains one org.joget.apps.form.model.FormRow object.

Samples:

Load user data using jdbc.

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.sql.DataSource;
import org.joget.apps.app.service.AppUtil;
import org.joget.apps.form.model.Element;
import org.joget.apps.form.model.FormData;
import org.joget.apps.form.model.FormRow;
import org.joget.apps.form.model.FormRowSet;
import org.joget.commons.util.LogUtil;
  
public FormRowSet load(Element element, String username, FormData formData) { 
    FormRowSet rows = new FormRowSet();
    if (username != null && !username.isEmpty()) {
        Connection con = null;
        try {
            // retrieve connection from the default datasource
            DataSource ds = (DataSource)AppUtil.getApplicationContext().getBean("setupDataSource");
            con = ds.getConnection();
         
            // execute SQL query
            if(!con.isClosed()) {
                PreparedStatement stmt = con.prepareStatement("SELECT username, firstName, lastName, email from dir_user where username=?");
                stmt.setObject(1, username);
                ResultSet rs = stmt.executeQuery();
                while (rs.next()) {
                    FormRow row = new FormRow();
                    System.out.println(rs.getObject("username") );
                    row.setProperty("username", (rs.getObject("username") != null)?rs.getObject("username").toString():"");
                    row.setProperty("firstName", (rs.getObject("firstName") != null)?rs.getObject("firstName").toString():"");
                    row.setProperty("lastName", (rs.getObject("lastName") != null)?rs.getObject("lastName").toString():"");
                    row.setProperty("email", (rs.getObject("email") != null)?rs.getObject("email").toString():"");
                    
                    rows.add(row);
                    break;
                }
            }
        } catch(Exception e) {
            LogUtil.error("Sample app - Form 1", e, "Error loading user data in load binder");
        } finally {
            //always close the connection after used
            try {
                if(con != null) {
                    con.close();
                }
            } catch(SQLException e) {/* ignored */}
        }
    }
    return rows;
}
  
//call load method with injected variable
return load(element, primaryKey, formData);

Use as Form Options Binder

Injected Variables:

- element - Element that this binder is tie to. (org.joget.apps.form.model.Element)
- primaryKey - The primary key provided by the element to load data. (java.lang.String)
- formData - The data holder of the whole form. (org.joget.apps.form.model.FormData)

Expected Return Object:

- An org.joget.apps.form.model.FormRowSet object which contains one or more org.joget.apps.form.model.FormRow object. All FormRow objects are expected to have "value" and "label" property.

Samples:

Load time zone as the select box options.

import java.util.Map;
import org.joget.apps.app.service.AppUtil;
import org.joget.apps.form.model.Element;
import org.joget.apps.form.model.FormData;
import org.joget.apps.form.model.FormRow;
import org.joget.apps.form.model.FormRowSet;
import org.joget.apps.form.service.FormUtil;
import org.joget.commons.util.TimeZoneUtil;

public FormRowSet load(Element element, String username, FormData formData) { 
    FormRowSet rows = new FormRowSet();
    
    //Get timezones using timezone util
    for(Map.Entry entry : TimeZoneUtil.getList().entrySet()){
        FormRow option = new FormRow();
        option.setProperty(FormUtil.PROPERTY_VALUE, (String) entry.getKey());
        option.setProperty(FormUtil.PROPERTY_LABEL, (String) entry.getValue());
        rows.add(option);
    }
    
    return rows;
}

//call load method with injected variable
return load(element, primaryKey, formData);

Use as Form Ajax Options Binder

Injected Variables:

- values - Dependency values of the controlling field. (java.lang.String[])

Expected Return Object:

- An org.joget.apps.form.model.FormRowSet object which contains one or more org.joget.apps.form.model.FormRow object. All FormRow objects are expected to have "value" and "label" property.

Samples:

Load user as options based on the group id passed by the controlling field.

import java.util.Collection;
import org.joget.apps.app.service.AppUtil;
import org.joget.apps.form.model.Element;
import org.joget.apps.form.model.FormData;
import org.joget.apps.form.model.FormRow;
import org.joget.apps.form.model.FormRowSet;
import org.joget.apps.form.service.FormUtil;
import org.joget.directory.model.User;
import org.joget.directory.model.service.ExtDirectoryManager;

public FormRowSet load(String[] values) { 
    FormRowSet rows = new FormRowSet();
    
    ExtDirectoryManager directoryManager = (ExtDirectoryManager) AppUtil.getApplicationContext().getBean("directoryManager");
    
    //set groupId based on dependency value
    String groupId = null;
    if (values != null && values.length > 0) {
        groupId = values[0];
    }
    
    //Get users using directory manager
    Collection userList = directoryManager.getUsers(null, null, null, null, groupId, null, null, "firstName", false, null, null);
    for(Object u : userList){
        User user = (User) u;
        FormRow option = new FormRow();
        option.setProperty(FormUtil.PROPERTY_VALUE, user.getUsername());
        option.setProperty(FormUtil.PROPERTY_LABEL, user.getFirstName() + " " + user.getLastName());
        rows.add(option);
    }
    
    return rows;
}

//call load method with injected variable
return load(values);

Use as Form Store Binder

Injected Variables:

- element - Element that this binder is tie to. (org.joget.apps.form.model.Element)
- rows - Data to be store. Contains only one org.joget.apps.form.model.FormRow object. (org.joget.apps.form.model.FormRowSet)
- formData - The data holder of the whole form. (org.joget.apps.form.model.FormData)

Expected Return Object:

- Same org.joget.apps.form.model.FormRowSet object which stored.

Samples:

Do some calculation before storing the data using Workflow Form Binder.

import java.text.DecimalFormat;
import org.joget.apps.app.service.AppUtil;
import org.joget.apps.form.model.Element;
import org.joget.apps.form.model.FormData;
import org.joget.apps.form.model.FormRow;
import org.joget.apps.form.model.FormRowSet;
import org.joget.apps.form.model.FormStoreBinder;
import org.joget.plugin.base.PluginManager;
 
public FormRowSet store(Element element, FormRowSet rows, FormData formData) {
    
    //check the rows is not empty before store it
    if (rows != null && !rows.isEmpty()) {
        //Get the submitted data
        FormRow row = rows.get(0);
        
        String unitPrice = row.getProperty("unitPrice");
        String unit = row.getProperty("unit");
        
        double total = 0;
        try {
            double price = Double.parseDouble(unitPrice);
            int unit = Integer.parseInt(unit);
            
            total = price * unit;
        } catch (Exception e) {}
        
        //format the total to 2 decimal
        DecimalFormat df = new DecimalFormat("#.00");
        row.setProperty("total", df.format(total));
    
        //Reuse Workflow Form Binder to store data
        PluginManager pluginManager = (PluginManager) AppUtil.getApplicationContext().getBean("pluginManager");
        FormStoreBinder binder = (FormStoreBinder) pluginManager.getPlugin("org.joget.apps.form.lib.WorkflowFormBinder");
        binder.store(element, rows, formData);
    }
    
    return rows;
}

//call store method with injected variable
return store(element, rows, formData);

Use as Form Validator

Injected Variables:

- element - Element that this validator is tie to. (org.joget.apps.form.model.Element)
- values - The submitted values of the element. (java.lang.String[])
- formData - The data holder of the whole form. (org.joget.apps.form.model.FormData)

Expected Return Object:

- A boolean value to indicate the validation pass or fail.

Samples:

Compare the submitted value with the value of another field.

import java.util.Arrays;
import org.joget.apps.app.service.AppUtil;
import org.joget.apps.form.model.Element;
import org.joget.apps.form.model.Form;
import org.joget.apps.form.model.FormData;
import org.joget.apps.form.service.FormUtil;

public boolean validate(Element element, FormData formData, String[] values) {
    boolean result = true;

    //get field 1 value from form data object
    String field1Id = "field1";
    Form form = FormUtil.findRootForm(element);
    Element field1 = FormUtil.findElement(field1Id, form, formData);

    if (field1 != null) {
        //get value of field 1
        String[] compareValues = FormUtil.getElementPropertyValues(field1, formData);

        //compare the value of field 2 and field 1 are equals
        if (!Arrays.equals(values, compareValues)) {
            String id = FormUtil.getElementParameterName(element);
            formData.addFormError(id, "Value not equal!!!!");
            result = false;
        } 
    } else {
        //ignore if the field 1 not exist
    }

    return result; 
}

//call validate method with injected variable
return validate(element, formData, values);

Use as Form Multi Row Load Binder

Injected Variables:

- element - Element that this binder is tie to. (org.joget.apps.form.model.Element)
- primaryKey - The primary key provided by the element to load data. (java.lang.String)
- formData - The data holder of the whole form. (org.joget.apps.form.model.FormData)

Expected Return Object:

- An org.joget.apps.form.model.FormRowSet object which contains one or more org.joget.apps.form.model.FormRow object.

Samples:

Load default grid data from another table if current record does not have any grid data.

import org.joget.apps.form.model.Element;
import org.joget.apps.form.model.FormData;
import org.joget.apps.form.model.FormRow;
import org.joget.apps.form.model.FormRowSet;
import org.joget.apps.form.service.FormUtil;
import org.joget.plugin.base.PluginManager;
import org.joget.apps.form.model.FormLoadBinder;

public FormRowSet load(Element element, String primaryKey, FormData formData) {
    String defaultFormDefId = "default_grid_entry"; //change this to the form id used to store default grid data
    String formDefId = "grid_entry";  //change this to the form id used to store grid data
    String foreignKey = "fk"; //change this to the foreign key 
    
    FormRowSet f = new FormRowSet();

    // Reuse Multi Row Binder to load data
    PluginManager pluginManager = (PluginManager) FormUtil.getApplicationContext().getBean("pluginManager");
    FormLoadBinder binder = (FormLoadBinder) pluginManager.getPlugin("org.joget.plugin.enterprise.MultirowFormBinder");
    
    //Load from the grid table
    binder.setProperty("formDefId", formDefId);
    binder.setProperty("foreignKey", foreignKey);
    f = binder.load(element, primaryKey, formData);
    
    //if no grid data is retrieved, get from default table
    if (f == null || f.isEmpty()) {
        binder.setProperty("formDefId", defaultFormDefId);
        
        //set the foreign key value to empty
        f = binder.load(element, "", formData);
    }
    return f;
}

//call load method with injected variable
return load(element, primaryKey, formData);

Use as Form Multi Row Store Binder

Injected Variables:

- element - Element that this binder is tie to. (org.joget.apps.form.model.Element)
- rows - Data to be store. Contains one or more org.joget.apps.form.model.FormRow object. (org.joget.apps.form.model.FormRowSet)
- formData - The data holder of the whole form. (org.joget.apps.form.model.FormData)

Expected Return Object:

- Same org.joget.apps.form.model.FormRowSet object which stored.

Samples:

Bulk create users based on the grid data.

import java.util.HashSet;
import java.util.Set;
import org.joget.apps.app.service.AppUtil;
import org.joget.apps.form.model.Element;
import org.joget.apps.form.model.FormData;
import org.joget.apps.form.model.FormRow;
import org.joget.apps.form.model.FormRowSet;
import org.joget.commons.util.LogUtil;
import org.joget.commons.util.StringUtil;
import org.joget.directory.model.Role;
import org.joget.directory.model.User;
import org.joget.directory.dao.RoleDao;
import org.joget.directory.dao.UserDao;
import org.joget.directory.model.service.DirectoryUtil;
import org.joget.directory.model.service.UserSecurity;
 
public FormRowSet store(Element element, FormRowSet rows, FormData formData) {
    try {
        UserSecurity us = DirectoryUtil.getUserSecurity();
        RoleDao roleDao = (RoleDao) AppUtil.getApplicationContext().getBean("roleDao");
        UserDao userDao = (UserDao) AppUtil.getApplicationContext().getBean("userDao");
        
        for (FormRow row : rows) {
            //Get the submitted data for each grid row
            String username = row.getProperty("username");
            String firstName = row.getProperty("firstName");
            String lastName = row.getProperty("lastName");
            String email = row.getProperty("email");
            String password = row.getProperty("password");
            
            User user = new User();
            user.setId(username);
            user.setUsername(username);
            user.setTimeZone("0");
            user.setActive(1);
            user.setFirstName(firstName);
            user.setLastName(lastName);
            user.setEmail(email);
            
            //Check if there is user security implementation, using it to encrypt password
            if (us != null) {
                user.setPassword(us.encryptPassword(username, password));
            } else {
                user.setPassword(StringUtil.md5Base16(password));
            }
            user.setConfirmPassword(password);
            
            //set user role
            Set roleSet = new HashSet();
            roleSet.add(roleDao.getRole("ROLE_USER"));
            user.setRoles(roleSet);
            
            userDao.addUser(user);
            if (us != null) {
                us.insertUserPostProcessing(user);
            }
        }
    } catch (Exception e) {
        LogUtil.error("Sample app - Bulk Create Users form", e, "Store user error!!");
    }
    return rows;
}
 
//call store method with injected variable
return store(element, rows, formData);

Use as Form Multi Row Validator

Injected Variables:

- element - Element that this validator is tie to. (org.joget.apps.form.model.Element)
- rows - Submitted data. Contains one or more org.joget.apps.form.model.FormRow object. (org.joget.apps.form.model.FormRowSet)
- formData - The data holder of the whole form. (org.joget.apps.form.model.FormData)

Expected Return Object:

- A boolean value to indicate the validation pass or fail.

Samples:

Validate the sum of a column values are less than 1000.

import java.util.Arrays;
import org.joget.apps.app.service.AppUtil;
import org.joget.apps.form.model.Element;
import org.joget.apps.form.model.Form;
import org.joget.apps.form.model.FormData;
import org.joget.apps.form.model.FormRow;
import org.joget.apps.form.model.FormRowSet;
import org.joget.apps.form.service.FormUtil;
 
public boolean validate(Element element, FormRowSet rows, FormData formData) {
    boolean result = true;
    if (rows != null && !rows.isEmpty()) {
        int total = 0;
        
        //Sum the values from column "amount"
        for (FormRow row : rows) {
            try {
                int amount = Integer.parseInt(row.getProperty("amount"));
                total += amount;
            } catch (Exception e) {}
        }
        
        //if amount larger than 1000
        if (total > 1000) {
            String id = FormUtil.getElementParameterName(element);
            formData.addFormError(id, "Total amount should not larger than 1000!!!!");
            result = false;
        }
    }
 
    return result;
}
 
//call validate method with injected variable
return validate(element, rows, formData);

Use as Form Permission

Injected Variables:

- user - User object of current logged in user (org.joget.directory.model.User)
- requestParams - Request parameters map of current HTTP Request (java.util.Map)

Expected Return Object:

- A boolean value to indicate the user is authorized.

Samples:

Check the current user's username are same with the form field "creator" value. The following sample using Form Hash Variable to retrieve form field value.

import java.util.Map;
import org.joget.directory.model.User;

public boolean isAuthorized(User user, Map params) { 
    //using hash variable to get "creator" field value and escapes it with java syntax, then compare with current username
    return "#form.crm_account.creator?java#".equals(user.getUsername());
}

//call isAuthorized method with injected variable
return isAuthorized(user, requestParams);

Use as Form Post Submission Processing Tool

Injected Variables:

- workflowAssignment - The workflow activity assignment object of the saving form. Null when the form is not an assignment form. (org.joget.workflow.model.WorkflowAssignment)
- pluginManager - Plugin Manager service bean for convenient usage. (org.joget.plugin.base.PluginManager)
- appDef - App definition of the process. (org.joget.apps.app.model.AppDefinition)
- request - Http Request object of current Http Request. (javax.servlet.http.HttpServletRequest)

Expected Return Object:

- None

Samples:

Reuse Email tool to send separate email to each users. The following script is for a form not mapped to workflow assignment, therefore workflowAssignment is not available.

import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.joget.apps.app.model.AppDefinition;
import org.joget.apps.app.service.AppPluginUtil;
import org.joget.apps.app.service.AppUtil;
import org.joget.plugin.base.ApplicationPlugin;
import org.joget.plugin.base.Plugin;
import org.joget.plugin.base.PluginManager;
import org.joget.plugin.property.model.PropertyEditable;
 
public Object execute(AppDefinition appDef, HttpServletRequest request) {
    String[] emails = new String[]{"test1@joget.org", "test2@joget.org"};
    
    //Reuse Email Tool to send separated email to a list of users;
    Plugin plugin = pluginManager.getPlugin("org.joget.apps.app.lib.EmailTool");
    
    //Get default properties (SMTP setting) for email tool
    Map propertiesMap = AppPluginUtil.getDefaultProperties(plugin, null, appDef, null);
    propertiesMap.put("pluginManager", pluginManager);
    propertiesMap.put("appDef", appDef);
    propertiesMap.put("request", request);
    
    ApplicationPlugin emailTool = (ApplicationPlugin) plugin;
    
    //send email
    for (String email : emails) {
        propertiesMap.put("toSpecific", email);
        propertiesMap.put("subject", "This is a test email for " + email);
        propertiesMap.put("message", "Email content for " + email);
        
        //set properties and execute the tool
        ((PropertyEditable) emailTool).setProperties(propertiesMap);
        emailTool.execute(propertiesMap);
    }
    
    return null;
}
 
//call execute method with injected variable
return execute(appDef, request);

Use as Process Participant

Injected Variables:

- pluginManager - Plugin Manager service bean for convenient usage. (org.joget.plugin.base.PluginManager)
- workflowActivity - Workflow Activity that trying to retrieves assignee. (org.joget.workflow.model.WorkflowActivity)

Expected Return Object:

- A java.util.Collection of username in java.lang.String to be assign to the Workflow Activity.

Samples:

Randomly assign an user in a department to a workflow activity.

import java.util.ArrayList;
import java.util.Collection;
import org.joget.apps.app.service.AppUtil;
import org.joget.directory.model.User;
import org.joget.directory.model.service.ExtDirectoryManager;
import org.joget.workflow.model.WorkflowActivity;

public Collection getAssignees(WorkflowActivity activity) { 
    Collection assignees = new ArrayList();
    
    ExtDirectoryManager directoryManager = (ExtDirectoryManager) pluginManager.getBean("directoryManager");
    
    String deptId = "D-005";
    
    //Get total user in department
    Long total = directoryManager.getTotalUsers(null, null, deptId, null, null, null, null);
    
    //Get random number from 0 to the total number of users in department
    int random = (int) (Math.random() * total);
    
    //Get users using directory manager
    Collection userList = directoryManager.getUsers(null, null, deptId, null, null, null, null, "firstName", false, random, 1);
    for(Object u : userList){
        User user = (User) u;
        assignees.add(user.getUsername());
    }
    
    return assignees;
}

//call getAssignees method with injected variable
return getAssignees(workflowActivity);

Use as Process Tool

Injected Variables:

- workflowAssignment - The workflow tool activity assignment object. (org.joget.workflow.model.WorkflowAssignment)
- pluginManager - Plugin Manager service bean for convenient usage. (org.joget.plugin.base.PluginManager)
- appDef - App definition of the process. (org.joget.apps.app.model.AppDefinition)
- request - Http Request object of current HTTP Request. Not available if the tool is trigger by Deadline. (javax.servlet.http.HttpServletRequest)

Expected Return Object:

- None

Samples:

Start a new process in the same app with current record id.

import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.joget.apps.app.model.AppDefinition;
import org.joget.apps.app.service.AppService;
import org.joget.apps.app.service.AppUtil;
import org.joget.workflow.model.service.WorkflowManager;
import org.joget.workflow.model.WorkflowAssignment;
import org.joget.workflow.model.WorkflowProcess;
 
public Object execute(WorkflowAssignment assignment, AppDefinition appDef, HttpServletRequest request) {
    AppService appService = (AppService) AppUtil.getApplicationContext().getBean("appService");
    WorkflowManager workflowManager = (WorkflowManager) AppUtil.getApplicationContext().getBean("workflowManager");
    
    //get current record id
    String recordId = appService.getOriginProcessId(assignment.getProcessId());
    
    //get process
    WorkflowProcess process = appService.getWorkflowProcessForApp(appDef.getAppId(), appDef.getVersion().toString(), "process2");
    
    //start process
    workflowManager.processStart(process.getId(), null, null, null, recordId, false);
    
    return null;
}
 
//call execute method with injected variable
return execute(workflowAssignment, appDef, request);

Update Form Field Value

import org.joget.apps.app.model.AppDefinition;
import org.joget.apps.app.service.AppService;
import org.joget.apps.app.service.AppUtil;
import org.joget.apps.form.model.FormRow;
import org.joget.apps.form.model.FormRowSet;
import org.joget.workflow.model.WorkflowAssignment;

String formDefId = "hr_expense_new";
String fieldId = "status";
String fieldValue = "Submitted";

//Get record Id from process
AppService appService = (AppService) AppUtil.getApplicationContext().getBean("appService");
String id = appService.getOriginProcessId(workflowAssignment.getProcessId());

//retrieve data
FormRow row = new FormRow();
FormRowSet rowSet = appService.loadFormData(appDef.getAppId(), appDef.getVersion().toString(), formDefId, id);
if (!rowSet.isEmpty()) {
    row = rowSet.get(0);
    //update field value
    row.setProperty(fieldId, fieldValue);
}

//Store the updated data
rowSet.set(0, row);
appService.storeFormData(appDef.getAppId(), appDef.getVersion().toString(), formDefId, rowSet, id);

Use as Userview Permission

Injected Variables:

- user - User object of current logged in user (org.joget.directory.model.User)
- requestParams - Request parameters map of current HTTP Request (java.util.Map)

Expected Return Object:

- A boolean value to indicate the user is authorized.

Samples:

Check the user is in a group and is an admin user.

import java.util.Collection;
import java.util.Map;
import org.joget.apps.app.service.AppUtil;
import org.joget.directory.model.Group;
import org.joget.directory.model.User;
import org.joget.directory.model.service.ExtDirectoryManager;
import org.joget.workflow.model.service.WorkflowUserManager;
import org.joget.workflow.util.WorkflowUtil;
public boolean isAuthorized(User user, Map params) { 
    //if no logged in user
    if (user == null) {
        return false;
    }
    //check current user is admin
    boolean isAdmin = WorkflowUtil.isCurrentUserInRole(WorkflowUserManager.ROLE_ADMIN);
    
    //check current user is in group "G-001"
    boolean inGroup = false;
    
    ExtDirectoryManager directoryManager = (ExtDirectoryManager) AppUtil.getApplicationContext().getBean("directoryManager");
    Collection groups = directoryManager.getGroupByUsername(user.getUsername());
    if (groups != null) {
        String groupId = "G-001";
        for (Group g : groups) {
            if (groupId.equals(g.getId())) {
                inGroup = true;
            }
        }
    }
    
    return isAdmin && inGroup;
}
  
//call isAuthorized method with injected variable
return isAuthorized(user, requestParams);

Best Practices

1. Only import classes that are needed

Do not use wildcard in import statement. It giving a very bad performance in Bean Shell interpreter to search the whole package and loads it in memory.

Don't:

import java.util.*;

Do:

import java.util.Collection;

2. Do not need to mention the type of element of a collections

Bean Shell interpreter cannot recognise the element type syntax of collections class like Collection, Map, List, Set and etc.

Don't:

Map<String, String> map = new HashMap<String, String>();

Do:

Map map = new HashMap();

3. Indents your script nicely and follows the Java Code Conventions

It will make yours and others life easier to maintain and review the script whenever necessary as Joget Workflow provided flexibility to adapt change quickly.

4. Write your script in functions

If your script is pretty long and some parts of the script are reusable, please make use of function to write your script. It provided better reading and performance.

5. Remember to write some comments

It will helps you and others to understand what is the purpose for the script quickly.

6. Catch the exceptions and give a meaningful message in log.

If you are using a lot of Bean Shell Scripting in your app, a meaningful log message can help you to locate your issue quickly.

Don't

try {
    //do something
} catch (Exception e) {
    LogUtil.error("BeanShell", e, "Error executing script");
}

Do:

try {
    //do something
} catch (Exception e) {
    LogUtil.error("CRM app - Backend userview", e, "Error retrieving user department in Report category permission");
}

7. Consider to make it as a plugin instead of using Bean Shell

If your script need to reuse for multiple times in an app or can be used by others app in future development, please consider to make your Bean Shell script as a plugin instead of copy and paste it multiple times across your app. Bean Shell script is harder to maintain in this case. Imagine that you want to make a change, you will have to update all the places that are using the same script as well. Beside that, a normal plugin implementation will have better performance than a script running by a Bean Shell interpreter.

8. Reuse existing plugins in your code to make it cleaner and easy to maintain

If partial of your script can be done by existing plugins in Joget Workflow, you can reuse the plugin in stead of writting it again.

To reuse a plugin, you can retrieve the plugin using PluginManager, then set it properties and execute it.

Example:

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Bean Shell 编程指南

什么是BeanShell？

代码语法如何？

用法

Use as Form Load Binder

Injected Variables:

Expected Return Object:

Samples:

Use as Form Options Binder

Injected Variables:

Expected Return Object:

Samples:

Use as Form Ajax Options Binder

Injected Variables:

Expected Return Object:

Samples:

Use as Form Store Binder

Injected Variables:

Expected Return Object:

Samples:

Use as Form Validator

Injected Variables:

Expected Return Object:

Samples:

Use as Form Multi Row Load Binder

Injected Variables:

Expected Return Object:

Samples:

Use as Form Multi Row Store Binder

Injected Variables:

Expected Return Object:

Samples:

Use as Form Multi Row Validator

Injected Variables:

Expected Return Object:

Samples:

Use as Form Permission

Injected Variables:

Expected Return Object:

Samples:

Use as Form Post Submission Processing Tool

Injected Variables:

Expected Return Object:

Samples:

Use as Process Participant

Injected Variables:

Expected Return Object:

Samples:

Use as Process Tool

Injected Variables:

Expected Return Object:

Samples:

Use as Userview Permission

Injected Variables:

Expected Return Object:

Samples:

Best Practices

1. Only import classes that are needed

2. Do not need to mention the type of element of a collections

3. Indents your script nicely and follows the Java Code Conventions

4. Write your script in functions

5. Remember to write some comments

6. Catch the exceptions and give a meaningful message in log.

7. Consider to make it as a plugin instead of using Bean Shell

8. Reuse existing plugins in your code to make it cleaner and easy to maintain

More samples