https://bz.apache.org/bugzilla/show_bug.cgi?id=69422
Bug ID: 69422
Summary: tomcat 9.0.82 upgrade to tomcat 9.0.96 ncountered a
problem JspTagExceptio
Product: Tomcat 9
Version: 9.0.96
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Jasper
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: -----
Created attachment 39919
--> https://bz.apache.org/bugzilla/attachment.cgi?id=39919&action=edit
jasper compile jsp to java code
Hi:
Recently, the project encountered problems when upgrading the tomcat version
to 9.0.96, But it is normal in version 9.0.82.
The exception stack in 9.0.96, is as follows,
[javax.servlet.jsp.JspTagException]
javax.servlet.jsp.JspTagException
at
org.apache.taglibs.standard.tag.common.core.SetSupport.doEndTag(SetSupport.java:249)
at
org.apache.jsp.WEB_002dINF.jsp.ctp.common.enumnew.bindEnumTree_jsp._jspx_meth_c_005fset_005f1(bindEnumTree_jsp.java:1018)
at
org.apache.jsp.WEB_002dINF.jsp.ctp.common.enumnew.bindEnumTree_jsp._jspService(bindEnumTree_jsp.java:242)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:67)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:623)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:466)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:376)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:324)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:623)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:199)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
JSTL jar info:
version=1.2.1
groupId=org.glassfish.web
artifactId=javax.servlet.jsp.jstl
Therefore, we compared the differences between the two versions and found that
the 9.0.96 version code has thread safety issues in concurrent situations. The
code comparison is as follows：
9.0.96 Jasper compile the generated java code， if Tag reuse, In the case of
multiple threads，
Thread A call "reuse" method , Thread B get same Tag object, when call
"doEndTag" method , at this time Thread A call methd "releaseTag" , Thread B
Tag Object reset. catch the JspTagException.
see attachment1.jpg
9.0.82 Jasper compile the generated java code, no problem code
see attachment2.jpg
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