Regarding "compile error that complains about that RequestDispatcher is an undefined symbol. "
When editing, are red issue icons in the Netbeans gutter on the left on some of the imports? This can show missing dependencies in your pom file. May need to add the javax-servlet-api dependency. Eric Bresie ebre...@gmail.com On Fri, Jan 20, 2023 at 5:33 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 > > >
