Re: Embedding with Tomcat 9
On Tue, Feb 18, 2020 at 6:29 PM Mark Thomas wrote:
> On 18/02/2020 23:13, Thad Humphries wrote:
> > On Tue, Feb 18, 2020 at 5:41 PM Mark Thomas wrote:
> >> On 18/02/2020 22:32, calder wrote:
> >>> On Tue, Feb 18, 2020, 14:12 Thad Humphries
>
>
>
> However although this runs it returns a 404 on /employee. Why?
> >>
> >> There aren't (doesn't appear to be) any Servlets mapped.
> >>
> >> Are there any web applications in the appBase?
> >>
> >
> > There is a servlet
> > in src/main/java/com/example/employees, EmployeeServlet.java, with the
> > annotation
> >
> > @WebServlet(
> > name = "EmployeeServlet",
> > urlPatterns = {"/employee"}
> > )
>
> OK. That will be relying on the StandardJarScanner finding that class -
> which it should.
>
> > In src/main/webapp is the file index.jsp which redirects to /employee:
>
> OK. Maven is copying that to META-INF/resources and hoping that Tomcat
> will treat the entire JAR as a resource JAR. That should work.
>
> > <%@ page info="sample index page" %>
> >
> >
> > Hello World!
> >
> >
> >
> >
> > With Tomcat 7.0.57, I can run `java -jar
> > employees-app-1.0-SNAPSHOT-jar-with-dependencies.jar` in target, and load
> > the page at http://localhost:/. With Tomcat 9.0.31, I get a 404
>
> Not sure which part is failing at this point. Using a purely static JSP
> without the forward and accessing /employee directly should tell you which.
If I comment out the jsp:forward, http://localhost:/ loads. However
http://localhost:/employee
still returns a 404.
I'd then recommend debugging your way though the Tomcat start process to
>
see where whichever element is failing is going wrong.
>
I'll see if I can figure out how to do that. Eclipse and I are not on the
best of terms. Frankly, loading JSPs is not something I need to do for how
I envision using embedded Tomcat. But I figure I need to know what's
happening because if I don't, I'm sure to run into problems down the road
when I'm dealing with something more complex.
--
"Hell hath no limits, nor is circumscrib'd In one self-place; but where we
are is hell, And where hell is, there must we ever be" --Christopher
Marlowe, *Doctor Faustus* (v. 111-13)
Re: Embedding with Tomcat 9
On 18/02/2020 23:13, Thad Humphries wrote:
> On Tue, Feb 18, 2020 at 5:41 PM Mark Thomas wrote:
>> On 18/02/2020 22:32, calder wrote:
>>> On Tue, Feb 18, 2020, 14:12 Thad Humphries
However although this runs it returns a 404 on /employee. Why?
>>
>> There aren't (doesn't appear to be) any Servlets mapped.
>>
>> Are there any web applications in the appBase?
>>
>
> There is a servlet
> in src/main/java/com/example/employees, EmployeeServlet.java, with the
> annotation
>
> @WebServlet(
> name = "EmployeeServlet",
> urlPatterns = {"/employee"}
> )
OK. That will be relying on the StandardJarScanner finding that class -
which it should.
> In src/main/webapp is the file index.jsp which redirects to /employee:
OK. Maven is copying that to META-INF/resources and hoping that Tomcat
will treat the entire JAR as a resource JAR. That should work.
> <%@ page info="sample index page" %>
>
>
> Hello World!
>
>
>
>
> With Tomcat 7.0.57, I can run `java -jar
> employees-app-1.0-SNAPSHOT-jar-with-dependencies.jar` in target, and load
> the page at http://localhost:/. With Tomcat 9.0.31, I get a 404
Not sure which part is failing at this point. Using a purely static JSP
without the forward and accessing /employee directly should tell you which.
I'd then recommend debugging your way though the Tomcat start process to
see where whichever element is failing is going wrong.
Mark
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Re: Embedding with Tomcat 9
On Tue, Feb 18, 2020 at 5:41 PM Mark Thomas wrote:
> On 18/02/2020 22:32, calder wrote:
> > On Tue, Feb 18, 2020, 14:12 Thad Humphries
> wrote:
> >
> >> I am trying to understand how to build and run an app from local with
> >> Tomcat 9 embedded using Java 8. I've started with this example written
> for
> >> Tomcat 7:
> >>
> >>
> https://www.oracle.com/webfolder/technetwork/tutorials/obe/java/basic_app_embedded_tomcat/basic_app-tomcat-embedded.html#overview
> >>
> >> I am able to get it to run with Tomcat 9 after a few changes to the
> pom.xml
> >> and one addition to the main() method:
> >>
> >> public static void main(String[] args) throws Exception {
> >>
> >
> >
> > String contextPath = "" ;
> >>
> >
> > May not be the issue, cause there's other code to consider, but should
> the
> > above line be
> >
> > String contextPath = "/" ;
>
> No. "" is the correct path for the ROOT context.
>
>
> >> String appBase = ".";
> >> Tomcat tomcat = new Tomcat();
> >> tomcat.setPort(Integer.valueOf(PORT.orElse("") ));
> >> // next line added for Tomcat 9
> >> tomcat.setConnector(tomcat.getConnector());
> >>
> >> tomcat.setHostname(HOSTNAME.orElse("localhost"));
> >> tomcat.getHost().setAppBase(appBase);
> >> tomcat.addWebapp(contextPath, appBase);
> >> tomcat.start();
> >> tomcat.getServer().await();
> >> }
> >>
> >> However although this runs it returns a 404 on /employee. Why?
>
> There aren't (doesn't appear to be) any Servlets mapped.
>
> Are there any web applications in the appBase?
>
There is a servlet
in src/main/java/com/example/employees, EmployeeServlet.java, with the
annotation
@WebServlet(
name = "EmployeeServlet",
urlPatterns = {"/employee"}
)
In src/main/webapp is the file index.jsp which redirects to /employee:
<%@ page info="sample index page" %>
Hello World!
With Tomcat 7.0.57, I can run `java -jar
employees-app-1.0-SNAPSHOT-jar-with-dependencies.jar` in target, and load
the page at http://localhost:/. With Tomcat 9.0.31, I get a 404
--
"Hell hath no limits, nor is circumscrib'd In one self-place; but where we
are is hell, And where hell is, there must we ever be" --Christopher
Marlowe, *Doctor Faustus* (v. 111-13)
Re: Embedding with Tomcat 9
On 18/02/2020 22:32, calder wrote:
> On Tue, Feb 18, 2020, 14:12 Thad Humphries wrote:
>
>> I am trying to understand how to build and run an app from local with
>> Tomcat 9 embedded using Java 8. I've started with this example written for
>> Tomcat 7:
>>
>> https://www.oracle.com/webfolder/technetwork/tutorials/obe/java/basic_app_embedded_tomcat/basic_app-tomcat-embedded.html#overview
>>
>> I am able to get it to run with Tomcat 9 after a few changes to the pom.xml
>> and one addition to the main() method:
>>
>> public static void main(String[] args) throws Exception {
>>
>
>
> String contextPath = "" ;
>>
>
> May not be the issue, cause there's other code to consider, but should the
> above line be
>
> String contextPath = "/" ;
No. "" is the correct path for the ROOT context.
>> String appBase = ".";
>> Tomcat tomcat = new Tomcat();
>> tomcat.setPort(Integer.valueOf(PORT.orElse("") ));
>> // next line added for Tomcat 9
>> tomcat.setConnector(tomcat.getConnector());
>>
>> tomcat.setHostname(HOSTNAME.orElse("localhost"));
>> tomcat.getHost().setAppBase(appBase);
>> tomcat.addWebapp(contextPath, appBase);
>> tomcat.start();
>> tomcat.getServer().await();
>> }
>>
>> However although this runs it returns a 404 on /employee. Why?
There aren't (doesn't appear to be) any Servlets mapped.
Are there any web applications in the appBase?
Mark
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Re: Embedding with Tomcat 9
On Tue, Feb 18, 2020, 14:12 Thad Humphries wrote:
> I am trying to understand how to build and run an app from local with
> Tomcat 9 embedded using Java 8. I've started with this example written for
> Tomcat 7:
>
> https://www.oracle.com/webfolder/technetwork/tutorials/obe/java/basic_app_embedded_tomcat/basic_app-tomcat-embedded.html#overview
>
> I am able to get it to run with Tomcat 9 after a few changes to the pom.xml
> and one addition to the main() method:
>
> public static void main(String[] args) throws Exception {
>
String contextPath = "" ;
>
May not be the issue, cause there's other code to consider, but should the
above line be
String contextPath = "/" ;
In the future, you should also check the full stack trace for clues
String appBase = ".";
> Tomcat tomcat = new Tomcat();
> tomcat.setPort(Integer.valueOf(PORT.orElse("") ));
> // next line added for Tomcat 9
> tomcat.setConnector(tomcat.getConnector());
>
> tomcat.setHostname(HOSTNAME.orElse("localhost"));
> tomcat.getHost().setAppBase(appBase);
> tomcat.addWebapp(contextPath, appBase);
> tomcat.start();
> tomcat.getServer().await();
> }
>
> However although this runs it returns a 404 on /employee. Why?
>
> I've tried variations on other Tomcat 9 examples (such as
> https://nkonev.name/post/101). There main() methods are considerably more
> involved, and I don't follow all that's going on. I've had no success. Some
> don't run, or, in the nkonev example earlier, JSPs aren't processed
> (probably because of "tomcat.setAddDefaultWebXmlToWebapp(false);" but if I
> commnent that out, the Jar won't run).
>
> What's the minimum to get the above main() to serve /employee?
>
>
Embedding with Tomcat 9
I am trying to understand how to build and run an app from local with
Tomcat 9 embedded using Java 8. I've started with this example written for
Tomcat 7:
https://www.oracle.com/webfolder/technetwork/tutorials/obe/java/basic_app_embedded_tomcat/basic_app-tomcat-embedded.html#overview
I am able to get it to run with Tomcat 9 after a few changes to the pom.xml
and one addition to the main() method:
public static void main(String[] args) throws Exception {
String contextPath = "" ;
String appBase = ".";
Tomcat tomcat = new Tomcat();
tomcat.setPort(Integer.valueOf(PORT.orElse("") ));
// next line added for Tomcat 9
tomcat.setConnector(tomcat.getConnector());
tomcat.setHostname(HOSTNAME.orElse("localhost"));
tomcat.getHost().setAppBase(appBase);
tomcat.addWebapp(contextPath, appBase);
tomcat.start();
tomcat.getServer().await();
}
However although this runs it returns a 404 on /employee. Why?
I've tried variations on other Tomcat 9 examples (such as
https://nkonev.name/post/101). There main() methods are considerably more
involved, and I don't follow all that's going on. I've had no success. Some
don't run, or, in the nkonev example earlier, JSPs aren't processed
(probably because of "tomcat.setAddDefaultWebXmlToWebapp(false);" but if I
commnent that out, the Jar won't run).
What's the minimum to get the above main() to serve /employee?
--
"Hell hath no limits, nor is circumscrib'd In one self-place; but where we
are is hell, And where hell is, there must we ever be" --Christopher
Marlowe, *Doctor Faustus* (v. 111-13)
