Hi,
Sorry that you are seeing this issue. Thank you for sharing the stacktrace. I ran few quick checks on Eclipse/MyEclipse with inline search in a Java editor and do not see the reported problem.
Can you please give us some more details to help us investigate further?
1. Which version of Eclipse are you working with? Also share your OS and version details.
2. Are you seeing the error only when trying to search and replace or even the search fails?
3. What language are you coding in? Delete the contents of the .log file, restart the IDE, replicate the error and share with us the complete log file (rename the extension to .txt and attach it here)
Apologies for inconvenience caused.