https://bz.apache.org/bugzilla/show_bug.cgi?id=69862
Bug ID: 69862
Summary: NullPointerException in
JspServletWrapper.handleJspException masks original
exception when getRootCause() returns null
Product: Tomcat 11
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Jasper
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: -------
Created attachment 40122
--> https://bz.apache.org/bugzilla/attachment.cgi?id=40122&action=edit
avoid NullPointerException when servletException.getRootCause is null
In JspServletWrapper.handleJspException(), when a ServletException has a null
root cause,
the method assigns null to realException, causing a NullPointerException when
calling
realException.getStackTrace(). This masks the original exception message.
Location: java/org/apache/jasper/servlet/JspServletWrapper.java
Current code (line ~615):
Throwable realException = ex;
if (ex instanceof ServletException) {
realException = ((ServletException) ex).getRootCause(); // Can be
null
}
StackTraceElement[] frames = realException.getStackTrace(); // NPE if
null
Reproduction:
When a JSP throws a ServletException with no root cause (e.g., missing JSP
file),
the actual error message like:
"org.apache.jasper.JasperException: /WEB-INF/decorators/main.jsp (line: [29],
column: [5]) JSP file [../pages/common/menu_oma.jsp] not found"
is replaced by a NullPointerException with no useful information.
Proposed fix:
if (ex instanceof ServletException servletException &&
servletException.getRootCause() instanceof Throwable rootCause) {
realException = rootCause;
}
This ensures realException always contains a valid Throwable.
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