NoClassDefFoundError-org-apache-taglibs-standard-tag-rt-core-IfTag

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