Extension for Java

Note: For Java 9+, the UiPath Extension for Java works on Windows Enterprise and non-Enterprise editions with applications opened with Java JDK. For applications opened with Java JRE, the UiPath Extension for Java only works on non-Enterprise Windows editions. Read more on the Java Extension Troubleshooting guide.

From Studio and the Command Line

The UiPath Extension for Java is installed by doing the following:

1. First, close any running Java applications. Launch Studio and access the Tools tab from the Studio Backstage view. The extensions you can install become visible. Click the Java Extensions button. A confirmation message appears, informing you that the extension has been installed.
2. Run this command C:\Program Files (x86)\UiPath\Studio\UiPath\SetupExtensions.exe /Java in a command prompt window with administrator rights.

Studio and UI Explorer also ask to install the UiPath Extension for Java when you try to select a control inside a Java app and when the bridge is not detected. Please note that if you choose to install the UiPath Extension for Java when prompted by UI Explorer the Java Bridge files get deployed only in the JRE directory which launched the target Java application instead of the JDK directory.

Note: To install this extension you must have administrator rights.

To check if the extension is not working properly, open UIExplorer and try to select controls inside a Java app. If the entire window is selected, it means that the extension is not working properly.

You can tell whether or not the extension is properly installed by the generated selectors for Java controls.

• Valid Selector for Java Controls: <wnd app=”...” /><java role=”...” />
• Invlaid Selector for Java Controls: <wnd app=”...” /><ctrl role=”client” />

Note: The UiPath Extension for Java is compatible only with AWT apps (e.g. Java Swing, Oracle Forms, Fujitsu JBK), while SWT apps are automated with Active Accessibility. To detect the type of your Java application, check the cls attribute (window class name) in UI Explorer. The class name should be similar to SunAwtFrame or javax.swing.

Processes can interact with Java applications regardless of their DPI scaling.

The UiPath Extension for Java can also be installed using the ScreenScrapeJavaSupport tool.

Installing the Extension in a custom folder

For Java 8 or Lower

In order to have the UiPath Extension for Java installed in a custom location, the following steps need to be performed:

1. Create a new folder on your machine in which you wish to install the UiPath Extension for Java (such as C:\UiPathJavaExt) and copy the following files to it:
   1. UiPathBridge.jar - located in the %UserProfile%\.nuget\packages\uipath\20.xx.xxxx\build\UiPath\JavaSupport directory.
   2. UiPathJavaBridgeV8.dll and UiPathJavaBridgeV8_x64.dll located in the %UserProfile%\.nuget\packages\uipath\20.xx.xxxx\build\UiPath directory. It is not necessary to copy both files, but it can prevent issues which can occur due to version mismatch between the JRE and the UiPathJavaBridge.
2. The Java Extension Setup mechanism used by UiPath to install the extension deploys the UiPathBridge.jar and accessibility.properties files in the Java installation directory (usually C:\Program Files (x86)\Java\jre1.8.0_xx). To use the UiPath Extension for Java from a custom folder, the dependency for these files must be loosened, as follows:
   1. For the UiPathBridge.jar file, you need to specify the folder in which you copied the UiPathBridge.jar and UiPathJavaBridgev8.dll (such as C:\UiPathJavaExt) when you start the Java application which uses the extension. This is done through the -Djava.ext.dirs = C:\UiPathJavaExt argument.
   2. For the accessibility.properties file, there are two methods:
      • Add the assistive_technologies=UiPath.UiPathBridge parameter to the accessibility.properties global configuration file located in the %userprofile% directory. Please note that this file is different from the one deployed by the UiPath Extension for Java, and its settings have precedence over the ones set by the Java installation.
      • Use the -Djavax.accessibility.assistive_technologies=UiPath.UiPathBridge argument when you run the target Java application.

System properties need to be properly passed to the target Java application. This can be done through several methods:

• Include the -Djava.ext.dirs=C:\UiPathJavaExt -Djavax.accessibility.assistive_technologies=UiPath.UiPathBridge system property in the _JAVA_OPTIONS environment variable. The JRE loads the properties from the environment variable and the UiPath Extension for Java loaded in the target application.
• Use the C:\Program Files (x86)\Java\jre1.8.0_xx\bin\java.exe -Djavax.ext.dirs=C:\UiPathJavaExt -Djavax.accessibility.assistive_technologies=UiPath.UiPathBridge -jar SwingSet2.jar command inside command prompt. A confirmation message appears that the UiPath Extension for Java is successfully loaded.
• Include the -Djava.ext.dirs=C:\UiPathJavaExt -Djavax.accessibility.assistive_technologies=UiPath.UiPathBridge system property in the JAVA_TOOL_OPTIONS environment variable. Please note that this method only works with Java 5 or greater.

Passing the properties to a Java applet is done with one of the following methods:

1. Using the appletviewer.exe application.
   This method requires you to first create the .java.policy file in the %userprofile% folder, and should contain the following:

   grant { 
       permission java.net.URLPermission "url_of_the_Java_applet", "<em>:</em>"; 
   };

   Once this is done, the target applet needs to be started via appletviewer.exe with this command:

   C:\Program Files (x86)\Java\jre1.8.0_xx\bin\appletviewer.exe -J-Djava.ext.dirs=C:\UiPathJavaExt -J-Djavax.accessibility.assistive_technologies=UiPath.UiPathBridge url_of_the_java_applet

2. Using the Java Control Panel which is delivered with the JRE.

   The Java Control Panel allows you to specify the runtime parameters for each registered JRE. As such, you need to specify the

   -Djava.ext.dirs=C:\UiPathJavaExt -Djavax.accessibility.assistive_technologies=UiPath.UiPathBridge

   parameter for the target applet. This makes the UiPath Extension for Java load every time the Java applet starts.

The table below present the compatibility between the methods used above, Java versions, and different types of Java applications:

Application Type	_JAVA_OPTIONS	JAVA_TOOL_OPTIONS	Command Line Parameters	Java Control Panel - Runtime Parameters
Java Desktop Application	Java 3 to Java 8	Java 5 to Java 8	Java 3 to Java 8	Not Supported
Java Contained Application (.exe)	Java 3 to Java 8	Java 5 to Java 8	Java 3 to Java 8 (1)	Not Supported
Java Applet	Java 3 to Java 8	Java 5 to Java 8	Not Supported	Java 3 to Java 8
Java Oracle Forms	Not Supported	Not Supported	Not Supported	Not Supported

(1) - Depending on the command line tool you use, additional parameters might need to be passed through the environment variables.

For Java 9 or Greater

Starting with Java 9, the Java Extension Mechanism is removed, which means that the -Djava.ext.dirs argument can not be used on Java 9 and greater applications. As such, the following steps need to be performed:

1. Create a new folder on your machine in which you wish to install the UiPath Extension for Java (such as C:\UiPathJavaExt) and copy the following files to it:
   1. UiPathBridge.jar and UiPathJavaServiceProvider.jar- located in the %UserProfile%\.nuget\packages\uipath\20.xx.xxxx\build\UiPath\JavaSupport directory.
   2. UiPathJavaBridgeV8.dll and UiPathJavaBridgeV8_x64.dll located in the %UserProfile%\.nuget\packages\uipath\20.xx.xxxx\build\UiPath directory. It is not necessary to copy both files, but it can prevent issues which can occur due to version mismatch between the JRE and the UiPath Java Bridge.
2. Add the previously created folder to the class path of the target Java application. This is done with the -cp, -classpath command. For the sake of our example, we consider SwingSet2 the target Java application:

   C:\Program Files (x86)\Java\jre1.9.0_xx \bin\java.exe -cp SwingSet2.jar;C:\UiPathJavaExt\* -Djavax.accessibility.assistive_technologies=UiPathJavaServiceProvider SwingSet2

Application Scaling Support

Scaling is fully supported for Java 9+ applications via parameters. Consider adding the following parameters to the Java application you want to automate to enable scaling support:

• sun.java2d.uiScale.enabled - When unused or set to the exact string value of "true", it is considered true and the following scaling configuration is taken into account. When set to any other value, but "true", (such as True, false, False, abc) then it is considered false and no additional scaling adjustments are made.
• sun.java2d.uiScale - Values can be passed in 3 forms:
  • As ratio (0.5, 2.3, 1.5)
  • As percentages (100%, 150%)
  • As dpi values (96dpi, 120dpi). It is considered if scaling is enabled. It modifies scaling on both axis.
• sun.java2d.win.uiScaleX, sun.java2d.win.uiScaleY Values can be passed as for the sun.java2d.uiScale parameter. Both of them are necessary in order to be considered by the Java application. They are more specific than the general configuration of scaling As such, if all 3 parameters are set, only these are taken into account.