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Editorial Team
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Asked: 2026-06-04T21:13:23+00:00

When I deployed a maven 3.0.3 built webapp into tomcat 7.0.23 on Linux (java

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When I deployed a maven 3.0.3 built webapp into tomcat 7.0.23 on Linux (java 1.6.x) and accessed posted my credentials in the login page, I got the following error. pom.xml references servlet 2.5, jsp 2.1 and JSTL 1.2.

Why would I get this Error ? what can I do to avoid it ?

I have other .war files deployed on the same tomcat instance and never faced this issue in those apps.

The 1st JSP(login.jsp) that I did a http GET didn’t throw an error. The POST from the 1st JSP to the 2nd Jsp(ChLogin.jsp) encountered the problem.

===========================

root cause

java.lang.VerifyError: (class: org/apache/jsp/ChLogin_jsp, method: _jspService signature: (Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V) Inconsistent stack height 0 != 1
    java.lang.Class.getDeclaredConstructors0(Native Method)
    java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
    java.lang.Class.getConstructor0(Class.java:2699)
    java.lang.Class.newInstance0(Class.java:326)
    java.lang.Class.newInstance(Class.java:308)
    org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:172)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

UPDATE 1
the WEB-INF\lib of the webapp does NOT contain servlet, jsp or JSTL jars. It contains many application dependencies and spring jars (we use spring MVC).

UPDATE 2
We don’t pre-compile JSPs. That is a goal for another day, though.

UPDATE 3
Discovered that this problem was not in tomcat 7.0.12, 7.0.14, 7.0.16 but started with 7.0.19. Posted to tomcat users mailing list. got a reply that it was perhaps the eclipse JDT compiler at fault. Verified that is indeed the case by replacing the compiler in tomcat 7.0.23/27 with tomcat 7.0.16’s JDT compiler and LO & BEHOLD, all is well. I am planning to write to the Eclipse JDT compiler team(if there is one) and post about this error.

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1 Answer

  1. Editorial Team

    The error is quite obvious: there is a bug in the jasper creating the bytecode. The generated code doesn’t clear the stack frame propery Inconsistent stack height 0 != 1

    You may try to shuffle the code, split into methods, move lines here and there and the bug might go away.
    Also can you post relevant info of the jsp servlet (matching *.jsp) from web.xml (usually somewhere in conf) to check compiler parameters?

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