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From bugzi...@apache.org
Subject [Bug 58110] New: JSP compiler points error to wrong line number when there are two same return statements.
Date Tue, 07 Jul 2015 10:30:54 GMT
https://bz.apache.org/bugzilla/show_bug.cgi?id=58110

            Bug ID: 58110
           Summary: JSP compiler points error to wrong line number when
                    there are two same return statements.
           Product: Tomcat 7
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Jasper
          Assignee: dev@tomcat.apache.org
          Reporter: lovetide@qq.com

Created attachment 32888
  --> https://bz.apache.org/bugzilla/attachment.cgi?id=32888&action=edit
Apache Tomcat_7.0.61 - Error report.html

I forgot to delete the last return "" statement, and JSP compile point error to
line number #8 which is same as the last return statement.

Code:
----------------------------------------------------------------------------------------------------
<%@ page pageEncoding='UTF-8' contentType='text/html'%>
<%@ page import = 'java.util.*' %>
<%!
String test ()
{
    List<Object> listObjectClasses = null;
    if (listObjectClasses==null || listObjectClasses.size()==0)
        return "";

    String sImageIconFile = null;
    for (Object objectClass : listObjectClasses)
    {
        //sImageIconFile = "active-directory-objectClass-" +
(String)objectClass + ".png";
    }
    boolean isImageIconFileExist = false;
    if (! (sImageIconFile==null || sImageIconFile.isEmpty()))
    {
        sImageIconFile = "images/" + sImageIconFile;
        //File fileImageIcon = new File (application.getRealPath
(sImageIconFile));
        //isImageIconFileExist = fileImageIcon.exists ();
    }
    return (sImageIconFile==null || sImageIconFile.isEmpty()) ? "" : "<img
src='" + sImageIconFile + "'/>";
    return "";
        // This statement above will cause tomcat JDT compiler point error to
line #8。 But if move this line into the above line, then compiler will point
error to the right line number #23
}
%>
----------------------------------------------------------------------------------------------------

JSP compile exception
----------------------------------------------------------------------------------------------------
org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: 8 in the jsp file: /test.jsp
Unreachable code
5: {
6:     List<Object> listObjectClasses = null;
7:     if (listObjectClasses==null || listObjectClasses.size()==0)
8:         return "1";
9: 
10:     String sImageIconFile = null;
11:     for (Object objectClass : listObjectClasses)


Stacktrace:
   
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:103)
   
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:366)
    org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:485)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:379)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:354)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:341)
   
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:657)
   
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
   
org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
----------------------------------------------------------------------------------------------------

If I put the test() function into a .java file and use javac to compile it,
javac will point error to right line number.
----------------------------------------------------------------------------------------------------
$ javac Test.java 
Picked up _JAVA_OPTIONS: -Dawt.useSystemAAFontSettings=lcd
Test.java:24: 错误: 无法访问的语句
        return "";
        ^
1 个错误
----------------------------------------------------------------------------------------------------

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