NoClassDefFoundError-org-apache-taglibs-standard-tag-rt-core-IfTag
java.lang.NoClassDefFoundError: org/apache/taglibs/standard/tag/rt/core/IfTag
If you see below error:
java.lang.NoClassDefFoundError: org/apache/taglibs/standard/tag/rt/core/IfTag at jsp_servlet.__index._jsp__tag0(__index.java:105) at jsp_servlet.__index._jspService(__index.java:84) at weblogic.servlet.jsp.JspBase.service(JspBase.java:34) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301) at weblogic.servlet.internal.ServletStubImpl.onAddToMapException(ServletStubImpl.java:416) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:327) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:184) at weblogic.servlet.internal.RequestDispatcherImpl.invokeServlet(RequestDispatcherImpl.java:529) at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:253) at com.javahonk.TestServlet.doGet(TestServlet.java:28) at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) at javax.servlet.http.HttpServlet.service(HttpServlet.java:820) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:184) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3732) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3696) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120) at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2273) at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179) at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1490) at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256) at weblogic.work.ExecuteThread.run(ExecuteThread.java:221) Caused by: java.lang.ClassNotFoundException: org.apache.taglibs.standard.tag.rt.core.IfTag at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:297) at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:270) at weblogic.utils.classloaders.ChangeAwareClassLoader.findClass(ChangeAwareClassLoader.java:64) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:179) at weblogic.utils.classloaders.ChangeAwareClassLoader.loadClass(ChangeAwareClassLoader.java:43) at weblogic.servlet.jsp.TagFileClassLoader.findClass(TagFileClassLoader.java:32) at weblogic.servlet.jsp.TagFileClassLoader.loadClass(TagFileClassLoader.java:24) at weblogic.servlet.jsp.JspClassLoader.findClass(JspClassLoader.java:59) at weblogic.servlet.jsp.JspClassLoader.loadClass(JspClassLoader.java:33) ... 27 more
Answer: It means jstl.jar is missing from your class path. Please include it in your class path. Below you could download jstl-1.2:
Download jstl-1.2