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Configure the Java Module Using Anypoint Code Builder

Define custom Java code using the Java module to use in your Anypoint Code Builder project. To use Anypoint Code Builder to configure the Java module, create a basic integration project in Anypoint Code Builder, add connectors and other components to your Mule application to process your business logic, and then configure the attributes for the Java Module.

Before You Begin

Before creating an Anypoint Code Builder integration project, you must:

Creating a New Integration Project

To create a new integration project:

  1. In the activity bar of the IDE, click the Anypoint Code Builder icon (Anypoint Code Builder) icon.

  2. From Quick Actions, click Develop an Integration:

    Develop an Integration link highlighted in the Getting started section

  3. Complete the following in the Develop an Integration form:

    Attribute Value

    Project Name

    Unique name for your project.

    This name is used as the title and name of the integration project file. For example, if the project name is "Salesforce Integration," the project file name is salesforce-integration.

    Project Location

    Your home directory or another directory you create. Click Browse to select a different directory for the integration project.

    Don’t create the project within another project directory.

    See Adding Folders to Your Home Directory.

  4. Select the type of project to create by selecting either the Empty Project or Template or Example card.

  5. Select the Mule runtime and Java Version for your app.

  6. Click Create Project.

    Develop an Integration Flow window

When you create a new integration project, Anypoint Code Builder creates the src/main/java and /src/test/java folders in the project. For existing projects, you can manually create these folders.

Adding Components to Your Project

Add components to your integration project to build a flow:

  1. In the Explorer view, open the XML file for your project, such as my-project-name.xml.

  2. Select Build a Flow from the start card to create an empty flow:

    Canvas UI with starting card with the option to start from scratch, build a flow, or build a subflow

  3. Change the name of the flow:

    1. Click Flow.

    2. Click the edit icon.

      Arrow pointing to the flow name edit pencil icon

    3. Enter the flow name, and click the checkmark.

    4. In the canvas UI, click the Add component icon (Add component) icon.

    5. In the Add Component panel, search for and select your component from the results. The following example shows the Listener component from the HTTP search results:

      Listener component highlighted in the Add Component section

      The configuration XML file now includes the XML for the HTTP Listener into the <flow/> element, for example:

      <flow name="getFlights" >
  <http:listener path="" config-ref="" doc:name="Listener" doc:id="ojzfry" />
</flow>

Configuring the Component Attributes

After you add components to your integration project, configure the attributes in the component UI, or configure the attributes directly in the XML code editor.

Connector XML tags start with a namespace followed by an operation, following the syntax namespace:operation, such as <db:select/> for a Select operation in Anypoint Connector for Database (Database Connector).

You can use autocomplete from an expression (fx) field for a component to select DataWeave functions from the Core module and other values accepted in this field.

Configure a Trigger for the Flow

A trigger (source) starts the flow when specified conditions are met. If a connector has its own associated sources, you can use a connector-specific trigger to initiate the flow. Each connector trigger has a unique configuration.

You can configure the following sources for this connector:

  • HTTP > Listener

    Initiates a flow each time it receives a request on the configured host and port

  • Scheduler

    Initiates a flow when a time-based condition is met

Configuring the New Operation

Create a new class instance by using the New operation of the Java module. The identifier of a constructor includes the class and constructor names, and the constructor has a full description of its signature, including the types of each parameter.

For example, if you invoke the constructor Me(String name, int age), which belongs to the org.bar.Me class, then the identifier of the method is Me(String,int).

To configure the attributes for New in the Anypoint Code Builder UI:

  1. Click the New component on the canvas.

  2. On the General tab:

    1. In Class, select the Java class that contains the method to use.

      You can search for all the available Java classes for your project, including classes you create and native Java classes.

    2. In Constructor, search and select the constructor to use.

      If this field is blank, click the refresh icon to populate it.

  3. Select the Advanced tab to configure the following attributes:

    UI Field Description Required

    Target variable

    Name of the variable to assign the class instance to.

    No

    Target value

    Expression that evaluates the operation’s output. The expression outcome is stored in the target variable.

    No

    Error Mappings

    Custom error types that you map to Mule error types. The mappings can help you further differentiate and group errors in your app. Configure this attribute in the XML editor. See Mule Errors.

    No

  4. Select the Input/Output tab to filter and view input and output variables stored in DataWeave.

After you add your class instance, configure the Invoke operation.

Configuring the Invoke Operation

Invoke methods with the provided arguments using a specified class instance. The identifier of the method to invoke includes the class and method names.

To configure the attributes for Invoke in the Anypoint Code Builder UI:

  1. Click the Invoke component on the canvas.

  2. On the General tab:

    1. Select the class Instance for invoking the method.

      This value is the target variable assigned to the New operation.

    2. In Class, select the Java class that contains the method to use.

      You can search for all the available Java classes for your project, including classes you create and native Java classes.

    3. In Method, search and select the method to use.

      Only the static methods from the class are displayed.

      If this field is blank, click the refresh icon to populate it.

  3. Select the Advanced tab to configure the following attributes:

    UI Field Description Required

    Output MIME type

    MIME type of the payload this component outputs.

    No

    Parameters

    Parameters appended to the value of the Output MIME type attribute as key-value pairs for a reader property. Multiple key-value pairs are allowed.

    No

    Output encoding

    Encoding of the payload that this component outputs.

    No

    Target variable

    Name of the variable that stores the operation’s output.

    No

    Target value

    Expression that evaluates the operation’s output. The expression outcome is stored in the target variable.

    No

    Error Mappings

    Custom error types that you map to Mule error types. The mappings can help you further differentiate and group errors in your app. Configure this attribute in the XML editor. See Mule Errors.

    No

  4. Select the Input/Output tab to filter and view input and output variables stored in DataWeave.

Configuring the Invoke Static Operation

Invoke static methods with the arguments you provide.

To configure the attributes for Invoke Static in the Anypoint Code Builder UI:

  1. Click the Invoke Static component on the canvas.

  2. On the General tab:

    1. In Class, select the Java class that contains the method to use.

      You can search for all the available Java classes for your project, including classes you create and native Java classes.

    2. In Method, search and select the method to use.

      Only the static methods from the class are displayed.

      If this field is blank, click the refresh icon to populate it.

  3. Select the Advanced tab to configure the following attributes:

    UI Field Description Required

    Output MIME type

    MIME type of the payload this component outputs.

    No

    Parameters

    Parameters appended to the value of the Output MIME type attribute as key-value pairs for a reader property. Multiple key-value pairs are allowed.

    No

    Output encoding

    Encoding of the payload that this component outputs.

    No

    Target variable

    Name of the variable that stores the operation’s output.

    No

    Target value

    Expression that evaluates the operation’s output. The expression outcome is stored in the target variable.

    No

    Error Mappings

    Custom error types that you map to Mule error types. The mappings can help you further differentiate and group errors in your app. Configure this attribute in the XML editor. See Mule Errors.

    No

  4. Select the Input/Output tab to filter and view input and output variables stored in DataWeave.

Configuring the Validate Type Operation

Validate that the class instance is an instance of (instanceof) the expected class using the Validate Type operation.

To configure the attributes for Validate Type in the Anypoint Code Builder UI:

  1. Click the Validate type component on the canvas.

  2. On the General tab:

    1. Select the Class the instance belongs to.

    2. Enter the name of the class Instance to validate.

    3. Select Accept subtypes to accept subtypes of a class.

      Deselect this option if the class instance must be of the same class.

Example

Creating a Java Class

Create Java classes containing methods to use in your application flows. The classes you create in your project are not available to other projects in your Anypoint Code Builder workspace.

  1. In your Anypoint Code Builder project, create a new Java package called com.me under src/main/java.

  2. Create a new Java class called TaxCalculator.java, and add the implementation, for example:

    package com.me;

public class TaxCalculator {

    private Double percentBaseTax = 7.0;

    public Double calculateTax(Double price, Integer percentAdditionalTax) {
        return price * (this.percentBaseTax + percentAdditionalTax) / 100;
    }

    public Boolean isTaxFree(Double price) {
        if (price < 10) {
            return true;
        }
        return false;
    }
}

In this example code, there are two methods:

  • calculateTax, which receives the price and percentAdditionalTax parameters.

  • isTaxFree, which receives the price parameter.

Configure an HTTP Trigger

  1. Click the Listener component on the canvas UI.

  2. Optionally, click the edit icon to change the name of the Listener component.

  3. Select the configuration file for the connector, or add the HTTP configuration to the XML outside of the flow, for example:

    <mule xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:http="http://www.mulesoft.org/schema/mule/http"
	xmlns:java="http://www.mulesoft.org/schema/mule/java" xsi:schemaLocation="http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
	http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
	http://www.mulesoft.org/schema/mule/java http://www.mulesoft.org/schema/mule/java/current/mule-java.xsd">
  <http:listener-config name="HTTP_listener_config">
    <http:listener-connection host="0.0.0.0" port="8081" />
  </http:listener-config>
  <flow name="name1">
    <http:listener path="/calculatePath" config-ref="HTTP_listener_config" doc:name="Listener" doc:id="511e4743-a5ed-4e74-8174-ead32ff575ea" allowedMethods="POST" />
  </flow>
</mule>

  4. On the General tab, enter /calculateTax in the Path field.

  5. On the Advanced tab, set the Allowed methods to POST.

Create a New Class Instance

You must create a new class instance because the method used in this example is non-static :

  1. Click the New component on the canvas.

  2. On the General tab:

    1. Select the Class that contains the method to use, in this case, com.me.TaxCalculator.

    2. Select the Method to use: TaxCalculator().

      If this field is blank, click the refresh icon to populate it.

  3. On the Advanced tab, assign the new class instance to a target variable called taxCalculator.

    Your code now looks similar to this:

<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:java="http://www.mulesoft.org/schema/mule/java" xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns:ee="http://www.mulesoft.org/schema/mule/ee/core" xsi:schemaLocation="http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
  http://www.mulesoft.org/schema/mule/java http://www.mulesoft.org/schema/mule/java/current/mule-java.xsd
  http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
  http://www.mulesoft.org/schema/mule/ee/core http://www.mulesoft.org/schema/mule/ee/core/current/mule-ee.xsd">

  <http:listener-config name="HTTP_Listener_config">
    <http:listener-connection host="0.0.0.0" port="8081" />
  </http:listener-config>

  <flow name="java1">
    <http:listener doc:name="Listener" config-ref="HTTP_Listener_config" path="/calculateTax" allowedMethods="POST"/>
    <java:new class="com.me.TaxCalculator" constructor="TaxCalculator()" target="taxCalculator" />
  </flow>
</mule>

Add an Invoke Operation

To call your method, add an Invoke operation:

  1. Click the Invoke component on the canvas.

  2. On the General tab:

    1. Enter #[vars.taxCalculator] as the class Instance for invoking the method.

    2. Select the Class that contains the method to use, in this case, com.me.TaxCalculator.

    3. Select the Method to use: calculateTax(java.lang.Double,java.lang.Integer).

      The methods shown are the standard non-static Java methods and the methods you created.

  3. On the Advanced tab, assign the Invoke operation to a target variable called taxResult.

  4. In the XML editor, add the Java arguments as a DataWeave expression:

    <java:args>#[{
        arg0: payload:price,
        arg1: payload:percentAdditionalTax
      }]</java:args>

Your XML code looks similar to this now:

<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:java="http://www.mulesoft.org/schema/mule/java" xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns:ee="http://www.mulesoft.org/schema/mule/ee/core" xsi:schemaLocation="http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
  http://www.mulesoft.org/schema/mule/java http://www.mulesoft.org/schema/mule/java/current/mule-java.xsd
  http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
  http://www.mulesoft.org/schema/mule/ee/core http://www.mulesoft.org/schema/mule/ee/core/current/mule-ee.xsd">

  <http:listener-config name="HTTP_Listener_config">
    <http:listener-connection host="0.0.0.0" port="8081" />
  </http:listener-config>

  <flow name="java1">
    <http:listener doc:name="Listener" config-ref="HTTP_Listener_config" path="/calculateTax" allowedMethods="POST"/>
    <java:new class="com.me.TaxCalculator" constructor="TaxCalculator()" target="taxCalculator" />

    <java:invoke instance="#[vars.taxCalculator]" class="com.me.TaxCalculator" method="calculateTax(Double, Integer)" target="taxResult">
      <java:args>#[{
        arg0: payload.price,
        arg1: payload.percentAdditionalTax
      }]</java:args>
    </java:invoke>
  </flow>
</mule>

Add the Set Payload Transformer

To update the payload of the message, use the Set Payload (set-payload) component. The payload can be a literal string or a DataWeave expression.

  1. In the canvas UI, click the (Add component) icon.

  2. In the Add Component panel, search for Set Payload and select it.

  3. Click the Set Payload component.

  4. On the General tab enter #[vars.taxResult as String] for the Value.

  5. For Encoding, select ISO 10646/Unicode(UTF8).

  6. For Mime type, select text/plain.

Your XML code looks similar to this now:

<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:java="http://www.mulesoft.org/schema/mule/java" xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns:ee="http://www.mulesoft.org/schema/mule/ee/core" xsi:schemaLocation="http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
  http://www.mulesoft.org/schema/mule/java http://www.mulesoft.org/schema/mule/java/current/mule-java.xsd
  http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
  http://www.mulesoft.org/schema/mule/ee/core http://www.mulesoft.org/schema/mule/ee/core/current/mule-ee.xsd">

  <http:listener-config name="HTTP_Listener_config">
    <http:listener-connection host="0.0.0.0" port="8081" />
  </http:listener-config>

  <flow name="java1">
    <http:listener doc:name="Listener" config-ref="HTTP_Listener_config" path="/calculateTax" allowedMethods="POST"/>
    <java:new class="com.me.TaxCalculator" constructor="TaxCalculator()" target="taxCalculator" />

    <java:invoke instance="#[vars.taxCalculator]" class="com.me.TaxCalculator" method="calculateTax(Double, Integer)" target="taxResult">
      <java:args>#[{
        arg0: payload.price,
        arg1: payload.percentAdditionalTax
      }]</java:args>
    </java:invoke>

    <set-payload value="#[vars.taxResult as String]" doc:name="Set payload" doc:id="kyujdh" mimeType="text/plain" encoding="UTF-8"/>
  </flow>
</mule>

Run Your Application in Debug Mode

After setting up your debug conditions, run a debug session and evaluate your Mule application at each breakpoint:

  1. Open the Run and Debug panel.

    Show me how

    • Click the (Run and Debug) icon in the activity bar.

    • Use the keyboard shortcuts:

      • Mac: Cmd+Shift+d

      • Windows: Ctrl+Shift+d

    • In the desktop IDE, select View > Run.

    • In the cloud IDE, click the (menu) icon, and select View > Run.

  2. Click the (Start Debugging (F5)) icon for Debug Mule Application.

    Alternatively, if the Start Debugging (F5) icon is not present:

    1. Click Run and Debug.

    2. If a Select debugger dropdown menu appears, select Mule Xml Debugger to initiate the debugging session:

      Run and Debug button and Mule XML Debugger menu item

      When the application deploys successfully, you see a DEPLOYED log message in the output panel:

      **********************************************************************
*              - - + DOMAIN + - -               * - - + STATUS + - - *
**********************************************************************
* default                                       * DEPLOYED           *
**********************************************************************
Selecting Run > Start without Debugging produces an error.

Anypoint Code Builder packages your application and deploys the application to the embedded Mule runtime engine. A terminal opens so you can view the status:

Debugging status in a terminal window

The terminal displays a message and the status bar turns red to indicate that the application is running.

Use buttons on the debug toolbar to control debugging of Mule applications.

See Also

Java Module Reference

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