How to use java classes in Talend

Question

I made the routines for the two classes with me in Talend and then used tjava to call the method but unable to do so..I also tried using tjava for all and did a onSubjob ok on each of the tjava. How can I call my classes in talend and call my methods? I tried making routines of two classes and tried loading the routines but then I am getting this error : Exception in thread "main" java.lang.NoSuchFieldError: INSTANCE

Answer 1

This error indicates that the definition of a class has unexpectedly changed. This can be because of JDK version incompatibility as well. So, you can try upgrading your JDK, and if this doesn't work follow the below steps:

1.) Right-click on the job present in your repository
2.) Then select "setup routines dependencies"
3.) Delete all existing "User Routine dependencies" which are not being used in the current job
4.) Execute the job
This can be because you are missing on some jar. Once you provide the jar, the job executes fine.

Hope this will help!

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Thanks.

Answer 2

For many data integration requirements, the standard Talend components provide the means to process the data from start to end without needing to use Java code apart from in tMap. 

For more complex requirements, it is often necessary to add additional Java logic to a job, and in other cases, it may be that adding custom Java code will provide a simpler or more elegant or more efficient code than using the standard components.

Comments

Yup. Perfect.