studio
2024.10
true
- Release Notes
- Getting Started
- Setup and Configuration
- Automation Projects
- Dependencies
- Types of Workflows
- Control Flow
- File Comparison
- Automation Best Practices
- Source Control Integration
- Debugging
- Logging
- The Diagnostic Tool
- Workflow Analyzer
- About Workflow Analyzer
- ST-NMG-001 - Variables Naming Convention
- ST-NMG-002 - Arguments Naming Convention
- ST-NMG-004 - Display Name Duplication
- ST-NMG-005 - Variable Overrides Variable
- ST-NMG-006 - Variable Overrides Argument
- ST-NMG-008 - Variable Length Exceeded
- ST-NMG-009 - Prefix Datatable Variables
- ST-NMG-011 - Prefix Datatable Arguments
- ST-NMG-012 - Argument Default Values
- ST-NMG-016 - Argument Length Exceeded
- ST-NMG-017 - Class name matches default namespace
- ST-DBP-002 - High Arguments Count
- ST-DBP-003 - Empty Catch Block
- ST-DBP-007 - Multiple Flowchart Layers
- ST-DPB-010 - Multiple instances of [Workflow] or [Test Case]
- ST-DBP-020 - Undefined Output Properties
- ST-DBP-021 - Hardcoded Timeout
- ST-DBP-023 - Empty Workflow
- ST-DBP-024 - Persistence Activity Check
- ST-DBP-025 - Variables Serialization Prerequisite
- ST-DBP-026 - Delay Activity Usage
- ST-DBP-027 - Persistence Best Practice
- ST-DBP-028 - Arguments Serialization Prerequisite
- ST-USG-005 - Hardcoded Activity Arguments
- ST-USG-009 - Unused Variables
- ST-USG-010 - Unused Dependencies
- ST-USG-014 - Package Restrictions
- ST-USG-020 - Minimum Log Messages
- ST-USG-024 - Unused Saved for Later
- ST-USG-025 - Saved Value Misuse
- ST-USG-026 - Activity Restrictions
- ST-USG-027 - Required Packages
- ST-USG-028 - Restrict Invoke File Templates
- ST-USG-032 - Required Tags
- ST-USG-034 - Automation Hub URL
- Variables
- Arguments
- Imported Namespaces
- Coded automations
- Introduction
- Registering custom services
- Before and After contexts
- Generating code
- Generating coded test case from manual test cases
- Trigger-based Attended Automation
- Recording
- UI Elements
- Selectors
- Object Repository
- Data Scraping
- Image and Text Automation
- Automating Citrix Technologies
- RDP Automation
- VMware Horizon Automation
- Salesforce Automation
- SAP Automation
- macOS UI Automation
- The ScreenScrapeJavaSupport Tool
- The WebDriver Protocol
- Extensions
- About extensions
- SetupExtensions tool
- UiPathRemoteRuntime.exe is not running in the remote session
- UiPath Remote Runtime blocks Citrix session from being closed
- UiPath Remote Runtime causes memory leak
- UiPath.UIAutomation.Activities packages and UiPath Remote Runtime versions mismatch
- The required UiPath extension is not installed on the remote machine
- Screen resolution settings
- Chrome Group Policies
- Cannot communicate with the browser
- Chrome extension is removed automatically
- The extension may have been corrupted
- Check if the extension for Chrome is installed and enabled
- Check if ChromeNativeMessaging.exe is running
- Check if ComSpec variable is defined correctly
- Enable access to file URLs and Incognito mode
- Multiple browser profiles
- Group Policy conflict
- Known issues specific to MV3 extensions
- List of extensions for Chrome
- Chrome Extension on Mac
- Edge Group Policies
- Cannot communicate with the browser
- Edge extension is removed automatically
- The extension may have been corrupted
- Check if the Extension for Microsoft Edge is installed and enabled
- Check if ChromeNativeMessaging.exe is running
- Check if ComSpec variable is defined correctly
- Enable access to file URLs and InPrivate mode
- Multiple browser profiles
- Group Policy conflict
- Known issues specific to MV3 extensions
- List of extensions for Edge
- Extension for Safari
- Installing the extension on macOS
- Java extension troubleshooting
- Extension for VMware Horizon
- Extension for Amazon WorkSpaces
- SAP Solution Manager plugin
- Excel Add-in
- Test Suite - Studio
- Troubleshooting
Java extension troubleshooting
Studio User Guide
Last updated Nov 4, 2024
Java extension troubleshooting
This page presents the most frequent reasons for which the Extension for Java might not work properly, and how to solve these issues.
Check if UiPath Studio can retrieve valid Java selectors
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.
If you can select controls, but their selectors look like
<wnd app=”...” /><ctrl role=”client” />
instead of <wnd app=”...” /><java role=”...” />
, then the extension is not working properly.
Please note that 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 UiExplorer. The class name should be similar to SunAwtFrame
or javax.swing
.
Check if the extension files are loaded by the Java application
- Open Process Explorer.
- In the View menu, select Lower Pane View > DLLS, or press Ctrl+D. A panel is displayed in the lower part of the window.
- Select the process of your Java app and check if
UiPathJavaBridgeV8.dll
orUiPathJavaBridgeV8_x64.dll
are loaded by your Java app. - Check from what path the
java.dll
module is loaded. A regular JRE has a path likeC:\Program Files (x86)\Java\jre1.8.0_xx\bin\java.dll
. A custom JRE is usually located in the application folder.
Check if the extension files have been added to the JRE
- Using a text editor, such as Notepad++, open the
accessibility.properties
file, which is located in theC:\Program Files (x86)\Java\jre1.8.0_xx\lib
folder. If the extension is properly installed, the file should containassistive_technologies=UiPath.UiPathBridge
. - In the
C:\Program Files (x86)\Java\jre1.8.0_xx\lib\ext
folder, you should find theUiPathBridge.jar
file. -
In the
C:\Program Files (x86)\Java\jre1.8.0_xx\bin
folder, you should findUiPathJavaBridgeV8.dll
orUiPathJavaBridgeV8_x64.dll
.Note: If any of the previous requirements are not met, you can try to reinstall the extension as explained above, or fix them manually.
Do not call
DestroyJavaVM()
if your target application executes JNI code, as user threads run within the UiPath Java Extension DLL.
Important: This applies to UI Automation packages older than 22.2.
Prior to Java 9, the Java Runtime Environment (JRE) included the
jdk.attach
module, which interacted with the UiPath Extension Java to generate appropriate selectors. Java 9+ only includes this module
in the Java Development Kit (JDK).
Selectors are generated for any Java 9+ application opened with Java JDK. If, however, you need to create automation projects
which interact with applications opened with Java JRE, you need to manually include the
jdk.attach
module in the target JRE.
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.
Having Java Access Bridge enabled creates the
accessibility.properties
file in the current user's home directory which overwrites the accessibility bridge loaded by the default bridge. The solution
is to disable the Java Access Bridge and remove the accessibility.properties
file, as follows:
- Go to Control Panel > Ease of Access Center > Make the computer easier to see.
- Scroll to the bottom of the page to the Other programs installed section.
- Make sure the Enable Java Access Bridge box is not selected.
- If the Enable Java Access Bridge box was checked go to
C:\Users\current_user
. - Delete the
.accessibility.properties
file.Note: If the Enable Java Access Bridge option is not visible, you need to reinstall or update Java.