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Author

Hi Servlet invoke error

Shaan patil
Ranch Hand

Joined: Dec 22, 2007
Posts: 58
Hi, I am getting the following error when I try to invoke a servlet(ThreeParams) in the coreservletes package.



type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Cannot allocate servlet instance for path /servlet/coreservlets.ThreeParams
org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:388)
org.apache.catalina.servlets.InvokerServlet.doGet(InvokerServlet.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

java.lang.UnsupportedClassVersionError: coreservlets/ThreeParams (Unsupported major.minor version 50.0)
java.lang.ClassLoader.defineClass0(Native Method)
java.lang.ClassLoader.defineClass(ClassLoader.java:539)
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1634)
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:860)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1307)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1189)
org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:369)
org.apache.catalina.servlets.InvokerServlet.doGet(InvokerServlet.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note The full stack trace of the root cause is available in the Apache Tomcat/5.0.27 logs.
Apache Tomcat/5.0.27


Waiting for the solution,


Regards
[ January 28, 2008: Message edited by: Shaan patil ]

"You cannot change the truth but truth can change you "
Ben Souther
Sheriff

Joined: Dec 11, 2004
Posts: 13410

java.lang.UnsupportedClassVersionError



This happens when you try to run a class that was compiled with a more recent version of java than the JRE you're using.

Example:
If you compiled your servlet with the javac that came with jdk1.5 and then tried to run it in Tomcat under jdk1.4.x.


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