JSPErrorReport: unexpected tag: 15 in SDEInstaller

[volosied]

Describe the bug
The JSP/Pages application will encounter an exception like this one:

com.ibm.ws.jsp.webcontainerext.JSPErrorReport: unexpected tag: 15
	at com.ibm.ws.jsp.translator.utils.SDEInstaller.copyConstantPool(SDEInstaller.java:287)
	at com.ibm.ws.jsp.translator.utils.SDEInstaller.addSDE(SDEInstaller.java:89)
	at com.ibm.ws.jsp.translator.utils.SDEInstaller.<init>(SDEInstaller.java:59)
	at com.ibm.ws.jsp.translator.utils.SDEInstaller.install(SDEInstaller.java:3

Steps to Reproduce

1. Enable -Dwas.debug.mode=true in the jvm.options file.
2. The java code that triggers this error varies, but for this bug, the user reported concatenation as the cause.
   For example: String newlocation = rootContext + "/somePage.jsp";

Expected behavior
No errors should occur.

Diagnostic information:

• OpenLiberty Version: All
• Affected feature(s) jsp-2.3, pages-3.0, pages-3.1
• Java Version: Java 11, 17, 21
• server.xml configuration: N/A

Additional context
https://bz.apache.org/bugzilla/show_bug.cgi?id=54475