Re: [jetty-users] java.lang.InstantiationException with new Servlet, tho

[Jan Bartel <janb@xxxxxxxxxxx>]

Bill,

Well,  you're trying to instantiate an abstract class. Not going to work like that.

Jan

PS For future posts, please include the version of jetty you're using so the linenumbers are meaningful.

On 15 October 2015 at 12:37, Bill Ross <ross@xxxxxxxxxxxx> wrote:

I am getting an uninformative InstantiationException at startup with a new Servlet added to web.xml - it seems to be set up exactly like Servlets that have been working.

Here is some stack (no indication of cause, but if I comment the new Servlet out of web.xml, it goes away):

2015-10-14 18:18:52.413:WARN:/pr:main: unavailable
java.lang.InstantiationException
        at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:48)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
        at java.lang.Class.newInstance(Class.java:442)
        at org.eclipse.jetty.server.handler.ContextHandler$Context.createInstance(ContextHandler.java:2443)
        at org.eclipse.jetty.servlet.ServletContextHandler$Context.createServlet(ServletContextHandler.java:1306)
        at org.eclipse.jetty.servlet.ServletHolder.newInstance(ServletHolder.java:1193)
        at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:593)
        at org.eclipse.jetty.servlet.ServletHolder.initialize(ServletHolder.java:403)


Comparing CommentServlet (fail) to GetNextServlet (works):

-- web.xml

    <servlet>
        <servlet-name>getnext</servlet-name>
        <servlet-class>com.priot.servlet.GetNext</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>getnext</servlet-name>
        <url-pattern>/getnext</url-pattern>
    </servlet-mapping>

    <servlet>
        <servlet-name>comment</servlet-name>
        <servlet-class>com.priot.servlet.CommentServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>comment</servlet-name>
        <url-pattern>/comment</url-pattern>
    </servlet-mapping>

-- the war:

WEB-INF/classes/com/priot/servlet/CommentServlet.class
WEB-INF/classes/com/priot/servlet/GetNext.class

-- the code:

package com.priot.servlet;

public abstract class CommentServlet extends HttpServlet {

    @Override
    public void init(ServletConfig config) throws ServletException {
    }

    @Override
    public String getServletInfo() {
        return "CommentServlet";
    }

    @Override
    public void doPost(HttpServletRequest req, HttpServletResponse res)
        throws ServletException, IOException  {
      ...
    }
}

Any ideas?

Thanks,
Bill
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--

Jan Bartel <janb@xxxxxxxxxxx>

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