[jsp] Unable to compile class for JSP

I am working in a JSP project. While runnning the project using Netbeans with Tomcat 6 server, I got the following exception,

org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: 8 in the generated java file
Only a type can be imported.  com.TransportPortal.MyFunctions resolves to a package

Stacktrace:
    org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92)
    org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
    org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:439)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:349)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:327)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:314)
    org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:589)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)

It has servelet-api.jar in Apache Tomcat's lib directory.

Please help me to resolve it.

Either you can Downgrade to JRE 1.7.49

or if you want to run on JRE 8

Step to fix:-

• Go to Lib folder of Liferay Tomcat .

• Replace :- ecj-3.7.2.jar with ecj-4.4.2.

• Restart the Server

<pluginManagement>
        <plugins>
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>       
                <version>2.2</version>
            </plugin>
        </plugins>

Try adding this to your web.xml:

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>
        /WEB-INF/your-servlet-name.xml
    </param-value>

org.apache.jasper.JasperException: Unable to compile class for JSP:

It may be related to Java JRE version.

In my case I need Tomcat 6.0.26 which presented same error with JRE 1.8.0_91. A downgrade to JRE 1.7.49 solved it.

You might find more information in: http://www.howopensource.com/2015/07/unable-to-compile-class-for-jsp-the-type-java-util-mapentry-cannot-be-resolved/

In my case, I was using the 6.0.24 Tomcat version (with JDK 1.8) and resolved the problem by upgrading to the 6.0.37 version.

Also, if you install the new tomcat version in a different folder, do not forget to copy your previous version /conf folder to the new installation folder.

I faced same exception in eclipse neon version exception is like below

org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: 1 in the generated java file
The type java.io.ObjectInputStream cannot be resolved. It is indirectly referenced from required .class files

Stacktrace:
    org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92)
    org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
    org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:439)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:349)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:327)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:314)
    org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:592)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

I using Apache tomcat 8 of maven plugin and i tried to update that but face same issue.

After i download new external apache tomcat version 8.5.14 and run project using this its will success for me

I hope some one to useful this for resolve above exception