[STR-273] duplicate class definition causes servlet exception

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Incomplete
• Affects Version/s: 1.0.0
• Component/s: Unknown
• Environment: Operating System: Linux; Platform: PC
• Bugzilla Id: 2466
• Assignee: Craig R. McClanahan
• Reporter: sad
• Created: 05/Jul/01 22:32
• Updated: 04/Jul/07 05:26
• Resolved: 04/Jul/07 05:26

Description

The problem involves three JSP files. The first file "index.jsp" defines a
frameset that includes the other two JSPs "title.jsp" and "home.jsp". If I
include the statement:

<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>

in both of the files "title.jsp" and "home.jsp" I get a servlet exception (see
the stacktrace at the end of this note). I do not see this problem with other
TLDs that I include in both files. To circumvent this problem, I exclude the
above TLD definition from the second file, "home.jsp".

Exception Report:

javax.servlet.ServletException: duplicate class definition:
org/apache/struts/taglib/html/LinkTag
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:461)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:254)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:194)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:255)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:225)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2252)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:446)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:163)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at
org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:875)
at
org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:952)
at java.lang.Thread.run(Thread.java:484)

Root Cause:

java.lang.LinkageError: duplicate class definition:
org/apache/struts/taglib/html/LinkTag
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:486)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:111)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:248)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at
org.apache.catalina.loader.StandardClassLoader.findClass(StandardClassLoader.java:664)
at
org.apache.catalina.loader.StandardClassLoader.loadClass(StandardClassLoader.java:1077)
at
org.apache.catalina.loader.StandardClassLoader.loadClass(StandardClassLoader.java:976)
at
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:176)
at
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:116)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:313)
at java.lang.Class.newInstance0(Native Method)
at java.lang.Class.newInstance(Class.java:237)
at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.load(JspServlet.java:137)
at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadIfNecessary(JspServlet.java:177)
at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:187)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:379)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:453)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:254)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:194)