Due to version problems, Tomcat 5.0.28 is configured using LOMBOZ3.0.28. So do the following modifications: Modify the Tomcat50X.Server file under the Eclipse / Plugins / Com.objectLearn.jdt.j2ee_3.0.1 / Servers directory . The less -DJAVA_HOME = "$ {jrePath}" - Dcatalina.base = "$ {serverRootDirectory}" -Dcatalina.home = "$ {serverRootDirectory}" -Djava.io.tmpdir = "$ {serverRootDirectory} / temp" -Djava .endorsed.dirs = "$ {serverRootDirectory} / bin; $ {serverRootDirectory} / common / endorsed" and -DJAVA_HOME = "$ {jrePath}" - Dcatalina.base = "$ {serverRootDirectory}" -Dcatalina.home = "$ {serverRootDirectory} "-Djava.io.tmpdir =" $ {serverRootDirectory} / temp "-Djava.endorsed.dirs =" $ {serverRootDirectory} / bin; $ {serverRootDirectory} / common / endorsed "appearances of these two - Djava.endorsed.dirs = "$ {serverRootDirectory} / bin; $ {serverRootDirectory} / common / endorsed" changed -Djava.endorsed.dirs = "$ {serverRootDirectory} / common / endorsed" and save it from the inside lomboz Start Tomcat5.0.28