I have a `HashMap` which stores ID and Name pair. For each entry of this map, conditionally, I am going to put it in another `HashMap`. At the end am going to do some operations with the second Map Entries. All this code is written in JSP file.

For single user request this is working fine. When more than one users are trying to access this file at a time, only one request is getting succeeded and resulting the same on other users.

We can see the following exception in the logs:

```
org.apache.jasper.JasperException: java.util.ConcurrentModificationException

```

Map is in this format 

```
Map<String, String> testmap= new HashMap<String, String>();

```