# Using custom Java keywords/library in Robot Framework using Jython **URL:** \ **Category:** Extensions\ **Created:** [17 June 2021 12:51 UTC](https://forum.robotframework.org/t/using-custom-java-keywords-library-in-robot-framework-using-jython/1955 "2021-06-17T12:51:55Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![GijsCIM](https://avatars.discourse-cdn.com/v4/letter/g/ad7895/32.png) [@GijsCIM](https://forum.robotframework.org/u/GijsCIM)\ **Post date:** [17 June 2021 12:51 UTC](https://forum.robotframework.org/t/using-custom-java-keywords-library-in-robot-framework-using-jython/1955/1 "2021-06-17T12:51:56Z")
Im trying to import my own Java library into RFW to use the keywords. Importing Selenium works fine. I have exported the java class to a .jar. Things I have tried: 1. With the .jar and .robot file in the same folder: ```python λ jython -m robot testcase1.robot ``` 1. Pasting the MyTestLib.jar in C:\Program Files\jython2.7.2\Lib\site-packages and running: ```python λ jython -m robot testcase1.robot ``` 1. ```python jython -Dpython.path=C:\Users\Gijs\eclipse-workspace\testrobot\src\test\robotframework\acceptance\ -m robot testcase1.robot ``` 1. Setting my CLASSPATH env variable to C:\Users\Gijs\eclipse-workspace\testrobot\src\test\robotframework\acceptance and running ```python λ jython -m robot testcase1.robot ``` Every time i get the same error: ```python [ERROR] Error in file 'C:\Users\Gijs\eclipse-workspace\testrobot\src\test\robotframework\acceptance\testcase1.robot' on line 5: Importing library 'MyTestLib.jar' failed: NoClassDefFoundError: com/cimsolutions/testautomation/testrobot/MyTestLib (wrong name: MyTestLib) ``` What am I doing wrong? Here is my java class: ```python public class MyTestLib { public static final String ROBOT_LIBRARY_SCOPE = "GLOBAL"; public void hello(String name){ System.out.println("Hello " + name + ".\n"); } public void Nothing(){ } } ``` Here is my testsuite: ```python ***Settings*** Documentation This is a test file to test RFW ... Library SeleniumLibrary Library MyTestLib.jar ***Test Cases*** Testcase0 Log This is testcase 1.robot Starting logging Open Browser https://google.com chrome Set Browser Implicit Wait 1 Click Button //button[.//text() = 'Ik ga akkoord'] Sleep 1 Input Text name=q Cimsolutions Press Keys name=q \ue00c Press Keys name=q \ue007 Sleep 1 Close Browser Log Test completed MyLibTest Log My lib test is starting Nothing ``` I think I installed all requirements correctly: ```python C:\ λ jython --version Jython 2.7.2 C:\ λ java --version java 11.0.10 2021-01-19 LTS Java(TM) SE Runtime Environment 18.9 (build 11.0.10+8-LTS-162) Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.10+8-LTS-162, mixed mode) C:\ λ jython -m robot --version WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by org.python.core.io.StreamIO (file:/C:/Program%20Files/jython2.7.2/jython.jar) t o field java.io.FilterOutputStream.out WARNING: Please consider reporting this to the maintainers of org.python.core.io.StreamIO WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Robot Framework 4.0.3 (Jython 2.7.2 on java11.0.10) C:\ λ jython -m pip list WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by org.python.core.io.StreamIO (file:/C:/Program%20Files/jython2.7.2/jython.jar) t o field java.io.FilterOutputStream.out WARNING: Please consider reporting this to the maintainers of org.python.core.io.StreamIO WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release DEPRECATION: A future version of pip will drop support for Python 2.7. Package Version ------------------------------ ------- pip 19.1 robotframework 4.0.3 robotframework-seleniumlibrary 4.2.0 selenium 3.141.0 setuptools 41.0.1 urllib3 1.26.5 ``` ---
**Author:** ![HelioGuilherme66](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.robotframework.org/helioguilherme66/32/34_2.png) [@HelioGuilherme66](https://forum.robotframework.org/u/HelioGuilherme66)\ **Post date:** [18 June 2021 11:05 UTC](https://forum.robotframework.org/t/using-custom-java-keywords-library-in-robot-framework-using-jython/1955/2 "2021-06-18T11:05:59Z")
Well, I am surprised to see using Java 11 with Jython 2.7.2, but if it works… I would experiment, to remove the .jar from the library import, and make sure the MyTestLib.jar full pass is in CLASSPATH. Then if that does not work, I would experiment, without using .jar, but just .java and .class files. Can’t say more, except for you to double check the User Guide. Good luck. ---
**Author:** ![GijsCIM](https://avatars.discourse-cdn.com/v4/letter/g/ad7895/32.png) [@GijsCIM](https://forum.robotframework.org/u/GijsCIM)\ **Post date:** [22 June 2021 12:16 UTC](https://forum.robotframework.org/t/using-custom-java-keywords-library-in-robot-framework-using-jython/1955/3 "2021-06-22T12:16:53Z")
I tried downgrading to Java 8, but that was not the problem. Also the Classpath was not the problem as far as i can tell. But when I used the .class file it worked. Tried that before aswell, guess I made a little error somewhere. Thanks for the help! ---
**Author:** ![Logan455](https://avatars.discourse-cdn.com/v4/letter/l/3da27b/32.png) [@Logan455](https://forum.robotframework.org/u/Logan455)\ **Post date:** [17 September 2021 13:18 UTC](https://forum.robotframework.org/t/using-custom-java-keywords-library-in-robot-framework-using-jython/1955/4 "2021-09-17T13:18:07Z")
Try adding the full path to your “MyTestLib.jar” in the `CLASSPATH` envvar, like: ```python export CLASSPATH=\path\to\MyTestLib.jar ``` use Windows equivalent, of course.