Progress. Excellent.
On Sat, Jan 21, 2023 at 5:36 PM Peter Scharf <sch...@sanskritlibrary.org>
wrote:
> Now I see that this also works:
>
> <b>${miles} miles = ${kilometers} kilometers</b>
>
> I had put round braces instead of curly braces which caused the previous
> error.
>
> ******************************
> Peter M. Scharf, President
> The Sanskrit Library
> sch...@sanskritlibrary.org
> https://sanskritlibrary.org
> ******************************
>
> On Jan 21, 2023, at 7:12 AM, Carl Mosca <carljmo...@gmail.com> wrote:
>
> That should actually be a getAttribute to get the values you set - the
> parameter is what was passed to it but I am guessing you knew that.
>
> On Sat, Jan 21, 2023 at 8:03 AM Carl Mosca <carljmo...@gmail.com> wrote:
>
>> Good morning Peter,
>>
>> First off I have to apologize because I had not looked at your changes.
>> Given what I think you're trying to do at this point, you're not far off.
>>
>> You might do something like this to get the value of the miles for
>> example:
>>
>> <%= request.getParameter("miles")%>
>>
>> This will ultimately be a bit verbose and a bit harder to maintain than
>> other approaches so you might see beans used more if I understand where
>> you're going.
>>
>> If this makes sense conceptually, you might consider some of the slightly
>> newer approaches such as Spring Boot or Quarkus but that's just one
>> opinion. Such development stacks are a bit more opinionated but there's
>> some flexibility in both of them as well.
>>
>> I have looked at software development as both an art and a science and I
>> certainly respect the wide variety of preferences and approaches I
>> have encountered over the years.
>>
>> The offer to chat stands.
>>
>> Regards,
>> Carl
>>
>> On Fri, Jan 20, 2023 at 10:17 PM Peter Scharf <sch...@sanskritlibrary.org>
>> wrote:
>>
>>> Dear Carl,
>>> Thanks for your offer. Actually, my ultimate goal in doing the tutorial
>>> I have accomplished: to create a war file and be able to deploy it using
>>> the Tomcat manager. This is what I need to do to recreate my website
>>> server which was written a decade ago by an accomplished programmer who is
>>> no longer working for my organization.
>>> My narrower goal was to complete the tutorial, or to see how to do my
>>> the most modern and efficient methods what the tutorial was seeking to
>>> teach: pass information from a form to a program.
>>> I’m on central time and could meet you any afternoon that would be
>>> convenient for you. I could set up a Zoom meeting or Google Meet.
>>> Yours,
>>> Peter
>>>
>>> ******************************
>>> Peter M. Scharf, President
>>> The Sanskrit Library
>>> sch...@sanskritlibrary.org
>>> https://sanskritlibrary.org
>>> ******************************
>>>
>>> On Jan 20, 2023, at 5:42 PM, Carl Mosca <carljmo...@gmail.com> wrote:
>>>
>>> Hi Peter,
>>>
>>> I don't have the code handy but it sounds like the tutorial (which
>>> admittedly I have not viewed) is not making clear the relationship between
>>> the servlet reference to the variable which is in the html form if I am
>>> recalling correctly. (I used the NetBeans debugger to ensure that the
>>> value was present as expected in the code I ran.)
>>>
>>> I am wondering if walking through the code for 10-20 minutes would be
>>> more helpful. Just a thought. I am willing to do that if you like. I am
>>> in the eastern time zone (Richmond, VA).
>>>
>>> Alternatively if you don't get an answer from the list, I will try to
>>> make some time to document this example.
>>>
>>> Having said all that, what is your ultimate goal? This particular
>>> example represents a much older approach which is certainly workable but
>>> there are newer approaches which are more efficient in the long run.
>>>
>>> Happy to discuss.
>>>
>>> Regards,
>>> Carl
>>>
>>>
>>>
>>> On Fri, Jan 20, 2023 at 6:33 PM Peter Scharf <sch...@sanskritlibrary.org>
>>> wrote:
>>>
>>>> Now the next step in this tutorial passes the values of variables in
>>>> the java web form to a jsp file instead of embedding them in println
>>>> commands. Here is the code that the tutorial (
>>>> https://www.youtube.com/watch?v=eP9oz6ZKUXM at Creat JavaServer Page
>>>> (JSP), about 23 minutes into it) gives:
>>>>
>>>> protected void doPost(HttpServletRequest request, HttpServletResponse
>>>> response)
>>>> throws ServletException, IOException {
>>>> processRequest(request, response);
>>>> float miles = Float.parseFloat(request.getParameter("miles"));
>>>> float kilometers = miles * 1.61f;
>>>> request.setAttribute("miles", miles);
>>>> request.setAttribute("kilometers", kilometers);
>>>> String resultPage = "result.jsp";
>>>>
>>>> RequestDispatcher dispatcher =
>>>> request.getRequestDispatcher(resultPage);
>>>> dispacther.forward(request, response);
>>>> }
>>>>
>>>> I get a compile error that complains about that RequestDispatcher is an
>>>> undefined symbol. After much hunting on websites for answers, I revised
>>>> the code as in the project in the git:
>>>> https://github.com/the-sanskrit-library/public.git, namely:
>>>>
>>>> protected void doPost(HttpServletRequest request,
>>>> HttpServletResponse response)
>>>> throws ServletException, IOException {
>>>> float miles = Float.parseFloat(request.getParameter("miles"));
>>>> float kilometers = miles * 1.61f;
>>>> request.setAttribute("miles", miles);
>>>> request.setAttribute("kilometers", kilometers);
>>>> String resultPage = "result.jsp";
>>>> request.getRequestDispatcher(resultPage).forward(request,
>>>> response);
>>>> }
>>>>
>>>> Which compiles. However, the response I get give the string rather
>>>> than their values:
>>>>
>>>> Unit Conversion Result
>>>>
>>>> *$(miles) miles = $(kilometers) kilometers*
>>>> Any suggestions?
>>>> Yours,
>>>> Peter
>>>>
>>>> ******************************
>>>> Peter M. Scharf, President
>>>> The Sanskrit Library
>>>> sch...@sanskritlibrary.org
>>>> https://sanskritlibrary.org
>>>> ******************************
>>>>
>>>> On Jan 20, 2023, at 12:31 PM, Carl Mosca <carljmo...@gmail.com> wrote:
>>>>
>>>> You're welcome Peter and glad to hear it. You can remove/replace the
>>>> root app if/as needed.
>>>>
>>>> Regards,
>>>> Carl
>>>>
>>>> On Fri, Jan 20, 2023 at 1:28 PM Peter Scharf <
>>>> sch...@sanskritlibrary.org> wrote:
>>>>
>>>>> Dear Carl,
>>>>> Thanks for your help. I installed Tomcat version 9. Now the project
>>>>> runs correctly.
>>>>> Changing the context path to “/” however, interfered with the “It
>>>>> works” root app of Tomcat, so I changed it back. I get the correct result
>>>>> of the conversion servlet at the path
>>>>> http://localhost:8080/mavenproject3/convert.
>>>>> Yours,
>>>>> Peter
>>>>>
>>>>> ******************************
>>>>> Peter M. Scharf, President
>>>>> The Sanskrit Library
>>>>> sch...@sanskritlibrary.org
>>>>> https://sanskritlibrary.org
>>>>> ******************************
>>>>>
>>>>> On Jan 18, 2023, at 8:16 PM, Carl Mosca <carljmo...@gmail.com> wrote:
>>>>>
>>>>> Hi Peter,
>>>>>
>>>>> First off it looks like the example notes suggest using Tomcat 9 or
>>>>> earlier so I used 9.0.71.
>>>>>
>>>>> I changed the context path (in the context.xml file): <Context
>>>>> path="/"/>.
>>>>>
>>>>> It's worth looking at creating a .gitignore file so that class and
>>>>> other binaries are not in git as they are not needed.
>>>>>
>>>>> Regards,
>>>>> Carl
>>>>>
>>>>> On Wed, Jan 18, 2023 at 6:16 PM Peter Scharf <
>>>>> sch...@sanskritlibrary.org> wrote:
>>>>>
>>>>>> The catalina log has lots of info entries. Here’s one WARNING:
>>>>>>
>>>>>> 18-Jan-2023 12:10:12.964 WARNING [main]
>>>>>> org.apache.catalina.startup.HostConfig.deployDescriptor The path
>>>>>> attribute
>>>>>> with value [/mavenproject3] in deployment descriptor
>>>>>> [/usr/local/apache-tomcat-10.0.23/conf/Catalina/localhost/mavenproject3.xml]
>>>>>> has been ignored
>>>>>>
>>>>>> The catalina.out file has the same suspicious entry:
>>>>>>
>>>>>> 18-Jan-2023 12:10:12.964 WARNING [main]
>>>>>> org.apache.catalina.startup.HostConfig.deployDescriptor The path
>>>>>> attribute
>>>>>> with value [/mavenproject3] in deployment descriptor
>>>>>> [/usr/local/apache-tomcat-10.0.23/conf/Catalina/localhost/mavenproject3.xml]
>>>>>> has been ignored
>>>>>>
>>>>>> The localhost_access_log.2023-01-18.txt file has:
>>>>>>
>>>>>> 0:0:0:0:0:0:0:1 - - [18/Jan/2023:12:10:18 -0600] "GET /convert
>>>>>> HTTP/1.1" 404 759
>>>>>> 0:0:0:0:0:0:0:1 - - [18/Jan/2023:12:10:18 -0600] "GET /favicon.ico
>>>>>> HTTP/1.1" 200 21630
>>>>>> 0:0:0:0:0:0:0:1 - - [18/Jan/2023:16:50:07 -0600] "GET /mavenproject3/
>>>>>> HTTP/1.1" 200 453
>>>>>> 0:0:0:0:0:0:0:1 - - [18/Jan/2023:16:50:14 -0600] "POST
>>>>>> /mavenproject3/convert HTTP/1.1" 404 777
>>>>>> 0:0:0:0:0:0:0:1 - - [18/Jan/2023:16:51:11 -0600] "POST
>>>>>> /mavenproject3/convert HTTP/1.1" 404 777
>>>>>>
>>>>>> Regarding Java EE versus Jakarta EE, a quick search shows that none
>>>>>> of my project files contain ‘jakarta’ while the following all contain
>>>>>> ‘java’
>>>>>>
>>>>>> UnitConverterServlet.class
>>>>>> UnitConverterServlet.class
>>>>>> UnitConverterServlet.java
>>>>>> inputFiles.lst
>>>>>> javaee-endorsed-api-7.0.jar
>>>>>> pom.xml
>>>>>>
>>>>>>
>>>>>>
>>>>>> ******************************
>>>>>> Peter M. Scharf, President
>>>>>> The Sanskrit Library
>>>>>> sch...@sanskritlibrary.org
>>>>>> https://sanskritlibrary.org
>>>>>> ******************************
>>>>>>
>>>>>> On Jan 18, 2023, at 12:19 PM, Eric Bresie <ebre...@gmail.com> wrote:
>>>>>>
>>>>>> Does anything show up in tomcat log?
>>>>>>
>>>>>> I seem to recall there is some migration going on to move namespace
>>>>>> from Java EE to jakarta EE name space. Not sure if maybe that is coming
>>>>>> into play here. This might help if it is impacted
>>>>>>
>>>>>> https://github.com/apache/tomcat-jakartaee-migration
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Wed, Jan 18, 2023 at 12:11 PM Peter Scharf <
>>>>>> sch...@sanskritlibrary.org> wrote:
>>>>>>
>>>>>>> Thanks, Eric. I had tried that. I get the message:
>>>>>>>
>>>>>>> HTTP Status 404 – Not Found
>>>>>>> ------------------------------
>>>>>>>
>>>>>>> *Type* Status Report
>>>>>>>
>>>>>>> *Message* The requested resource [/convert] is not available
>>>>>>>
>>>>>>> *Description* The origin server did not find a current
>>>>>>> representation for the target resource or is not willing to disclose
>>>>>>> that
>>>>>>> one exists.
>>>>>>> ------------------------------
>>>>>>> Apache Tomcat/10.0.23
>>>>>>>
>>>>>>> ******************************
>>>>>>> Peter M. Scharf, President
>>>>>>> The Sanskrit Library
>>>>>>> sch...@sanskritlibrary.org
>>>>>>> https://sanskritlibrary.org
>>>>>>> ******************************
>>>>>>>
>>>>>>> On Jan 18, 2023, at 12:06 PM, Eric Bresie <ebre...@gmail.com> wrote:
>>>>>>>
>>>>>>>
>>>>>>> Servlet says the urlpattern is “/convert”
>>>>>>>
>>>>>>> Try
>>>>>>> http://localhost:8080/convert
>>>>>>>
>>>>>>>
>>>>>>> On Wed, Jan 18, 2023 at 11:51 AM Peter Scharf <
>>>>>>> sch...@sanskritlibrary.org> wrote:
>>>>>>>
>>>>>>>> Yes, the URL is correct:
>>>>>>>> https://github.com/the-sanskrit-library/public.git
>>>>>>>> The git directory hierarchy deceived me: I had the code outside the
>>>>>>>> git directory. I have now moved it into the git directory.
>>>>>>>> Forgive me; I’m not very familiar with git and am using the desktop
>>>>>>>> version.
>>>>>>>> Yours,
>>>>>>>> Peter
>>>>>>>>
>>>>>>>> ******************************
>>>>>>>> Peter M. Scharf, President
>>>>>>>> The Sanskrit Library
>>>>>>>> sch...@sanskritlibrary.org
>>>>>>>> https://sanskritlibrary.org
>>>>>>>> ******************************
>>>>>>>>
>>>>>>>> On Jan 18, 2023, at 5:35 AM, Carl Mosca <carljmo...@gmail.com>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>> Hi Peter,
>>>>>>>>
>>>>>>>> Can you confirm that url please. I am not seeing Java code there;
>>>>>>>> only a README and attribute file.
>>>>>>>>
>>>>>>>> Regards,
>>>>>>>> Carl
>>>>>>>>
>>>>>>>>
>>>>>>>> On Tue, Jan 17, 2023 at 10:40 PM Peter Scharf <
>>>>>>>> sch...@sanskritlibrary.org> wrote:
>>>>>>>>
>>>>>>>>> Thank you for suggesting to put the project on Github. I have now
>>>>>>>>> created a public repository at the following url:
>>>>>>>>>
>>>>>>>>> https://github.com/the-sanskrit-library/public.git
>>>>>>>>>
>>>>>>>>> The project is in the NetBeans directory.
>>>>>>>>> Yours,
>>>>>>>>> Peter
>>>>>>>>>
>>>>>>>>> ******************************
>>>>>>>>> Peter M. Scharf, President
>>>>>>>>> The Sanskrit Library
>>>>>>>>> sch...@sanskritlibrary.org
>>>>>>>>> https://sanskritlibrary.org
>>>>>>>>> ******************************
>>>>>>>>>
>>>>>>>>> On Jan 17, 2023, at 2:38 PM, Carl Mosca <carljmo...@gmail.com>
>>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>> Hello Peter,
>>>>>>>>>
>>>>>>>>> Is the project that you created somewhere (such as Github) such
>>>>>>>>> that folks could take a look at it?
>>>>>>>>>
>>>>>>>>> Regards,
>>>>>>>>> Carl
>>>>>>>>>
>>>>>>>>> On Mon, Jan 16, 2023 at 11:21 PM Peter Scharf <
>>>>>>>>> sch...@sanskritlibrary.org> wrote:
>>>>>>>>>
>>>>>>>>>> I just installed NetBeans 16 on a MacBook Pro with an M chip:
>>>>>>>>>>
>>>>>>>>>> *Product Version:* Apache NetBeans IDE 16
>>>>>>>>>> *Java:* 19.0.1; OpenJDK 64-Bit Server VM 19.0.1
>>>>>>>>>> *Runtime:* OpenJDK Runtime Environment 19.0.1
>>>>>>>>>> *System:* Mac OS X version 13.0.1 running on aarch64; UTF-8;
>>>>>>>>>> en_US (nb)
>>>>>>>>>>
>>>>>>>>>> I am trying to create a minimal servlet and war file to use with
>>>>>>>>>> Tomcat
>>>>>>>>>>
>>>>>>>>>> apache-tomcat-10.0.23
>>>>>>>>>>
>>>>>>>>>> I worked through half of the demo How to create a webapp tutorial
>>>>>>>>>> at: https://www.youtube.com/watch?v=eP9oz6ZKUXM
>>>>>>>>>> which, however, uses NetBeans 12 and other older software than I
>>>>>>>>>> have installed.
>>>>>>>>>> I was able to do the first item successfully with minor
>>>>>>>>>> adaptations:
>>>>>>>>>> 1. Create a Jave Web project with Maven
>>>>>>>>>> Got build error:
>>>>>>>>>>
>>>>>>>>>> https://stackoverflow.com/questions/66920567/error-injecting-org-apache-maven-plugin-war-warmojo
>>>>>>>>>> Went to: https://maven.apache.org/plugins/
>>>>>>>>>> Answer: manually configuring one of the recent war plug-ins in
>>>>>>>>>> POM.xml
>>>>>>>>>> Changed 2.3 to 3.3.2
>>>>>>>>>> Then got the form.
>>>>>>>>>> I successfully created the Unit Conversion form which opens in
>>>>>>>>>> Safari (Version 16.1) in tomcat:
>>>>>>>>>> http://localhost:8080/mavenproject3/
>>>>>>>>>>
>>>>>>>>>> But trying the second—third items:
>>>>>>>>>> 2. Create Java Servlet & JavaServer Page (JSP)
>>>>>>>>>> 3. Run Java Web App on Tomcat inside NetBeans
>>>>>>>>>>
>>>>>>>>>> I got stuck.
>>>>>>>>>> When I fill in a value in the miles box and click Convert to
>>>>>>>>>> kilometers, Safari gives me a
>>>>>>>>>> HTTP Status 404 – Not Found
>>>>>>>>>> Message The requested resource [/mavenproject3/convert] is not
>>>>>>>>>> available
>>>>>>>>>> Description The origin server did not find a current
>>>>>>>>>> representation for the target resource or is not willing to disclose
>>>>>>>>>> that
>>>>>>>>>> one exists.
>>>>>>>>>>
>>>>>>>>>> After a couple of days trying to fix it, I’m still at a loss.
>>>>>>>>>> I did get rid of a problem not finding the native tomcat
>>>>>>>>>> libraries:
>>>>>>>>>> INFO [main]
>>>>>>>>>> org.apache.catalina.core.AprLifecycleListener.lifecycleEvent The
>>>>>>>>>> Apache
>>>>>>>>>> Tomcat Native library which allows using OpenSSL was not found on the
>>>>>>>>>> java.library.path: ...
>>>>>>>>>> by dowloading and installing The Apache Tomcat Native library
>>>>>>>>>> following instructions here:
>>>>>>>>>> https://formulae.brew.sh/formula/tomcat-native
>>>>>>>>>>
>>>>>>>>>> However, I still get the 404 not found in Safari.
>>>>>>>>>> Can anyone help me?
>>>>>>>>>>
>>>>>>>>>> I wonder whether these debugger messages indicate a problem using
>>>>>>>>>> a symbolic link to my real tomcat directory from /Library/Tomcat
>>>>>>>>>>
>>>>>>>>>> 16-Jan-2023 11:15:13.009 INFO [main]
>>>>>>>>>> org.apache.catalina.startup.VersionLoggerListener.log Command line
>>>>>>>>>> argument: -Dignore.endorsed.dirs=
>>>>>>>>>> 16-Jan-2023 11:15:13.010 INFO [main]
>>>>>>>>>> org.apache.catalina.startup.VersionLoggerListener.log Command line
>>>>>>>>>> argument: -Dcatalina.base=/Library/Tomcat
>>>>>>>>>> 16-Jan-2023 11:15:13.010 INFO [main]
>>>>>>>>>> org.apache.catalina.startup.VersionLoggerListener.log Command line
>>>>>>>>>> argument: -Dcatalina.home=/Library/Tomcat
>>>>>>>>>>
>>>>>>>>>> but the infos in the debugger do tell me that it is using the
>>>>>>>>>> real directories:
>>>>>>>>>> CATALINA_BASE: /usr/local/apache-tomcat-10.0.23
>>>>>>>>>> CATALINA_HOME: /usr/local/apache-tomcat-10.0.23
>>>>>>>>>>
>>>>>>>>>> I get the following debugger WARNING:
>>>>>>>>>> WARNING [http-nio-8080-exec-10]
>>>>>>>>>> org.apache.catalina.startup.HostConfig.deployDescriptor The path
>>>>>>>>>> attribute
>>>>>>>>>> with value [/mavenproject3] in deployment descriptor
>>>>>>>>>> [/usr/local/apache-tomcat-10.0.23/conf/Catalina/localhost/mavenproject3.xml]
>>>>>>>>>> has been ignored
>>>>>>>>>>
>>>>>>>>>> Trying to follow suggestions at:
>>>>>>>>>> https://stackoverflow.com/questions/11731377/servlet-returns-http-status-404-the-requested-resource-servlet-is-not-availa
>>>>>>>>>> I’m lost. I can’t even figure out which versions of Servlet I’m
>>>>>>>>>> using, and the instructions to find out at.:
>>>>>>>>>> https://stackoverflow.com/questions/3913485/how-do-i-know-what-version-of-servlet-api-jar-i-have
>>>>>>>>>>
>>>>>>>>>> don’t provide enough context for me to know where to put the
>>>>>>>>>> commands suggested.
>>>>>>>>>>
>>>>>>>>>> ===
>>>>>>>>>> Can anyone help me either (a) work through this tutorial with
>>>>>>>>>> current versions of software, or (b) give me an example of how to
>>>>>>>>>> create a
>>>>>>>>>> servlet or portable war file in NetBeans to use with Tomcat by
>>>>>>>>>> copying it
>>>>>>>>>> to its webapps directory using current versions of NetBeans and other
>>>>>>>>>> software?
>>>>>>>>>>
>>>>>>>>>> Thank you in advance.
>>>>>>>>>> Yours,
>>>>>>>>>>
>>>>>>>>>> ******************************
>>>>>>>>>> Peter M. Scharf, President
>>>>>>>>>> The Sanskrit Library
>>>>>>>>>> sch...@sanskritlibrary.org
>>>>>>>>>> https://sanskritlibrary.org
>>>>>>>>>> ******************************
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> Carl J. Mosca
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> Carl J. Mosca
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>> Eric Bresie
>>>>>>> ebre...@gmail.com
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>> Eric Bresie
>>>>>> ebre...@gmail.com
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>> --
>>>>> Carl J. Mosca
>>>>>
>>>>>
>>>>>
>>>>
>>>> --
>>>> Carl J. Mosca
>>>>
>>>>
>>>>
>>>
>>> --
>>> Carl J. Mosca
>>>
>>>
>>>
>>
>> --
>> Carl J. Mosca
>>
>
>
> --
> Carl J. Mosca
>
>
> --
Regards,
Carl
