How I can detect and prevent memory leak in Java

Question

I have the following images showing the used memory and the committed memory.

• On the top: used 210 MB and committed 232 MB
• On the bottom: used 10 MB and committed 232 MB

The following image showing the last 6 hours of memory usage.

My Question: based on those graphs

• This application has a memory leak?
• And how I can detect and prevent this leak?

Thank you.

Answer 1

This application has a memory leak?

No.

And how I can detect and prevent this leak?

When the low point of the zigzag shape keeps being higher than the previous one continuously, and eventually the VM exits with OutOfMemoryError . This isn't happening here - you do not have a memory leak.

Java does not instantly garbage collect all garbage. It lets it build up for a bit, because that's more efficient in the long run.