GitHub user LittleSaya added a comment to the discussion: How could I change a
variable defined in JVM scope in JavaScript Action?
Ok, found a solution to my specific requirement which may not fit in other
circumstances:
Create a file for each processed table, and count the number of files in that
folder, for example:
If I have 3 tables: `table_aaa`, `table_bbb`, `table_ccc`, I create one file
for each of them:
```
${PROJECT_HOME}/count/table_aaa
${PROJECT_HOME}/count/table_bbb
${PROJECT_HOME}/count/table_ccc
```
then I count the number of file in `${PROJECT_HOME}/count`.
Basically this moves the variable out of Hop. A more general approach may be
invoking a shell script to calculate/write the variable then using Set Variable
to read the variable.
GitHub link:
https://github.com/apache/hop/discussions/5181#discussioncomment-12849285
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