vkydhyani opened a new issue, #5819:
URL: https://github.com/apache/hop/issues/5819
### Apache Hop version?
2.15
### Java version?
Tried on both 17 and 25
### Operating system
Windows
### What happened?
Hi Team,
I am getting a Java heap space issue while trying to merge 4 csv file into
one excel file.
**Error :**
Exception: java.lang.OutOfMemoryError thrown from the
UncaughtExceptionHandler in thread "Timer-1"
Exception in thread "HopGuiPipelineGraph: redraw timer" Exception in thread
"pool-2-thread-1" java.lang.OutOfMemoryError: Java heap space
2025/10/14 09:50:30 - Generate Additional Sheet.0 - ERROR: UnexpectedError:
Exception in thread "Timer-4" java.lang.OutOfMemoryError: Java heap space
java.lang.OutOfMemoryError: Java heap space
at java.base/java.util.HashMap$KeySet.toArray(HashMap.java:1002)
at
org.apache.commons.vfs2.impl.DefaultFileMonitor.run(DefaultFileMonitor.java:476)
at java.base/java.lang.Thread.runWith(Thread.java:1487)
at java.base/java.lang.Thread.run(Thread.java:1474)
2025/10/14 09:50:30 - Generate Additional Sheet.0 - ERROR:
java.lang.OutOfMemoryError: Java heap space
<img width="704" height="181" alt="Image"
src="https://github.com/user-attachments/assets/d7975b5a-74ad-4e5f-b309-b8aea77a2017";
/>
Can you please suggest what is wrong here?
### Issue Priority
Priority: 3
### Issue Component
Component: Transforms
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