Invalid encoded request URI should return 400 instead of 500

[pmd1nh]

Describe the bug
500 status code returns for an invalid encoded URI. It also creates a FFDC log. It can cause a false alarm for the server administrator. A 400 Bad Request should be returned.

Steps to Reproduce
Send a bad encoded URI to an existing application (i.e context root). For example:

http://host:port/%5%20C..

Expected behavior
Return 400 Bad Request response without any FFDC.

Diagnostic information:

• OpenLiberty Version: all version until this is fixed.
• Affected feature(s) [servlet]
• Java Version: [11]
• server.xml configuration (WITHOUT sensitive information like passwords)
• If it would be useful, upload the messages.log file found in $WLP_OUTPUT_DIR/messages.log

Additional context
None

[pmd1nh]

Describe the bug
500 status code returns for an invalid encoded URI. It also creates a FFDC log. It can cause a false alarm for the server administrator. A 400 Bad Request should be returned.

Steps to Reproduce
Send a bad encoded URI to an existing application (i.e context root). For example:

http://host:port/%5%20C..

Expected behavior
Return 400 Bad Request response without any FFDC.

Diagnostic information:

• OpenLiberty Version: all version until this is fixed.
• Affected feature(s) [servlet]
• Java Version: [11]
• server.xml configuration (WITHOUT sensitive information like passwords)
• If it would be useful, upload the messages.log file found in $WLP_OUTPUT_DIR/messages.log

Additional context
None

[pnicolucci]

I'm adding the original description of this bug as a comment and updated the top-level comment with the release bug template:

The server returns a 500 and logs a FFDC for a request that contains invalid encoded character. It should return a 400 Bad Request instead.

Example: http://host:port/%5%20C..

Note: Most of the front-servers (i.e load balancer, web server...) may have filtered out these requests prior to the application server.

[pmd1nh]

Update tests to accommodate this change

https://github.ibm.com/websphere/WS-CD-Open/pull/31571

To avoid combined builds, the lWAS tests are disabled temporary until this PR is merged then reactive.