jstl异常

org.apache.jasper.JasperException: Failed to load or instantiate TagLibraryValidator class: org.apache.taglibs.standard.tlv.JstlCoreTLV

可能是tomcat自带的jsp-api和项目中的jsp-api的jar包冲突了，或者缺少jstl、standard jar包。

解决方法：项目中引用tomcat的jsp-api jar包，并且把jstl、standard jar包复制到tomcat lib包下

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