How to install JSTL? The absolute uri: http://java

2018-12-31 04:23发布

站内问答 / 后端开发
2030 13 6

I don't know what I've done incorrectly, but I can't include JSTL. I have jstl-1.2.jar, but unfortunately I get exception: 

org.apache.jasper.JasperException: The absolute uri: http://java.sun.com/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application
    at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:51)
    at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:409)
    at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:116)
    at org.apache.jasper.compiler.TagLibraryInfoImpl.generateTLDLocation(TagLibraryInfoImpl.java:315)
    at org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:148)
    at org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:429)
    at org.apache.jasper.compiler.Parser.parseDirective(Parser.java:492)
    at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1439)
    at org.apache.jasper.compiler.Parser.parse(Parser.java:137)
    at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:255)
    at org.apache.jasper.compiler.ParserController.parse(ParserController.java:103)
    at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:170)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:332)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:312)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:299)
    at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:586)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
    at java.lang.Thread.run(Thread.java:619)

I have:

  • pom.xml

    <dependency>
  <groupId>javax.servlet</groupId>
  <artifactId>servlet-api</artifactId>
  <version>2.5</version>
  <scope>provided</scope>
</dependency>
<dependency>
  <groupId>javax.servlet.jsp</groupId>
  <artifactId>jsp-api</artifactId>
  <version>2.1</version>
  <scope>provided</scope>
</dependency>

<dependency>
  <groupId>taglibs</groupId>
  <artifactId>standard</artifactId>
  <version>1.1.2</version>
</dependency>
<dependency>
  <groupId>javax.servlet</groupId>
  <artifactId>jstl</artifactId>
  <version>1.2</version>
</dependency>

  • web.xml

    <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
  version="2.5">

  • index.jsp

    <%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<html> 
<head></head>
<body></body>
</html>

13条回答
人间绝色
2楼-- · 2018-12-31 04:29

I had disabled MAVEN and Spring tools completely. And I had to add the following jar's for making my environment work right.

  • spring-aop-4.0.3.RELEASE.jar
  • spring-beans-4.0.3.RELEASE.jar (tough to find this fix, other org.springframework<3.versions> just did not work.
  • spring-context-4.0.3.RELEASE.jar
  • spring-core-4.0.3.RELEASE.jar
  • spring-expression-4.0.3.RELEASE.jar
  • spring-web-4.0.3.RELEASE.jar
  • spring-webmvc-4.0.3.RELEASE.jar
  • jstl-1.2.jar

The worst of all was jstl-api-1.2.jar and javax-servlet.jsp.jst-api-1.2.1.jar. They just did not work.

`jstl-1.2.jar worked well.

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梦寄多情
3楼-- · 2018-12-31 04:29

Just had similar problem in Eclipse fixed with:

rightclick on project->Properties->Deployment Assembly->add Maven Dependencies

something kicked it out before, while I was editing my pom.xml

I had all needed jar files, taglib uri and web.xml was ok

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爱死公子算了
4楼-- · 2018-12-31 04:34

org.apache.jasper.JasperException: The absolute uri: http://java.sun.com/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application

That URI is for JSTL 1.0, but you're actually using JSTL 1.2 which uses URIs with an additional /jsp path (because JSTL, who invented EL expressions, was since version 1.1 integrated as part of JSP in order to share/reuse the EL logic in plain JSP too).

So, fix the taglib URI accordingly:

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

Further your POM also specifies Apache's JSTL 1.1 implementation via taglibs:standard. This is unnecessary and even dangerous when you've already JSTL 1.2 API+impl bundled via javax.servlet:jstl, because 1.1 and 1.2 will obviously conflict each other. Just only the following JSTL 1.2 dependency should do it in order to have JSTL installed in your Tomcat-targeted webapp (do not set the <scope> to provided as Tomcat actually doesn't provide it out the box!):

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
</dependency>

Non-Maven users can achieve the same by dropping the single jstl-1.2.jar file in /WEB-INF/lib folder of the web application project (do not drop standard.jar or any loose .tld files in there!).

In case you're actually using a normal Java EE server such as WildFly, Payara, etc instead of a barebones servletcontainer such as Tomcat, Jetty, etc, then you don't need to explicitly install JSTL at all. Normal Java EE servers already provide JSTL out the box. In other words, you don't need to add JSTL to pom.xml nor to drop any JAR/TLD files in webapp. Solely the provided scoped Java EE coordinate is sufficient:

<dependency>
    <groupId>javax</groupId>
    <artifactId>javaee-api</artifactId>
    <version><!-- 8.0, 7.0, etc depending on your server --></version>
    <scope>provided</scope>
</dependency>

Further you should also make sure that your web.xml is declared conform at least Servlet 2.4 and thus not as Servlet 2.3 or older. Otherwise EL expressions inside JSTL tags would in turn fail to work. Pick the highest version matching your target container and make sure that you don't have a <!DOCTYPE> anywhere in your web.xml. Here's a Servlet 4.0 (Tomcat 9) compatible example:

<?xml version="1.0" encoding="UTF-8"?>
<web-app
    xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
    version="4.0">

    <!-- Config here. -->

</web-app>

See also:

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唯独是你
5楼-- · 2018-12-31 04:36

@BalusC is completely right, but If you still encounter this exception, it means that something you have done wrong. The most important information you will find is on the SO JSTL Tag Info page.

Basically this is a summary of what you need to do to deal with this exception.

  1. Check the servlet version in web.xml: <web-app version="2.5">

  2. Check if JSTL version is supported for this servlet version: Servlet version 2.5 uses JSTL 1.2 or Servlet version 2.4 uses JSTL 1.1

  3. Your servlet container must have the appropriate library, or you must include it manually in your application. For example: JSTL 1.2 requires jstl-1.2.jar

What to do with Tomcat 5 or 6:

You need to include appropriate jar(s) into your WEB-INF/lib directory (it will work only for your application) or to the tomcat/lib (will work globally for all applications).

The last thing is a taglib in your jsp files. For JSTL 1.2 correct one is this:

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
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路过你的时光
6楼-- · 2018-12-31 04:38

I found another reason for this type of error: in my case, someone set the catalina.properties setting tomcat.util.scan.StandardJarScanFilter.jarsToSkip property to * to avoid log warning messages, thereby skipping the necessary scan by Tomcat. Changing this back to the Tomcat default and adding an appropriate list of jars to skip (not including jstl-1.2 or spring-webmvc) solved the problem.

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长期被迫恋爱
7楼-- · 2018-12-31 04:38

If you have tried everything but it didn't help, you should restart server. In my case I just forgot to restart Tomcat, after adding javax.servlet.jsp.jstl-1.2.1.jar to lib directory.

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