Tomcat 9 jar containing @webservlet annotation not loaded if inside tomcat/lib

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Tomcat 9 jar containing @webservlet annotation not loaded if inside tomcat/lib

agharta82@gmail.com
Hi all,

A question, I can't solve that....

Tested with Tomcat 9.0.41, java 8 x64, linux (Fedora 32).


I have a standard tomcat web.xml (3.0 or 3.1, no matter).

I have created an external simple servlet with @WebServlet annotation,
and packaged it to a jar file:


@WebServlet(name = "TestServlet", urlPatterns = {"/TestServlet"}, loadOnStartup = 1)
public class TestServlet extends HttpServlet {

     private static final Logger log = Logger.getLogger(TestServlet.class.getName());

     private static final long serialVersionUID = 1L;

     @Override
     public void init() throws ServletException {
         log.setLevel(Level.ALL);
         log.log(Level.WARNING, "TESTSERVLET INIT");
         super.init();
     }

     @Override
     public void destroy() {
     }

     @Override
     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
         processRequest(req, resp);
     }

     protected void processRequest(HttpServletRequest request, HttpServletResponse response)
             throws ServletException, IOException {
         response.setContentType("text/html;charset=UTF-8");
         PrintWriter out = response.getWriter();

         try {
             out.println("<!DOCTYPE html>");
             out.println("<html>");
             out.println("<head>");
             out.println("<title>Servlet TestServlet</title>");
             out.println("</head>");
             out.println("<body>");
             out.println("<h1>Servlet TestServlet at " + request.getContextPath() + "</h1>");

             out.println("</body>");
             out.println("</html>");
         } finally {
             out.close();
         }
     }

}


So, if I copy the .jar file inside WEB-INF/lib folder of destination war
project the log message will appears and the servlet is reachable.

But, if I copy the .jar file inside tomcat/lib folder the annotation
won't be processed.


FYI, in tomcat 7 both cases (inside WEB-INF/lib and tomcat/lib) works well.


I searched on breaking changes between tomcat 7 and 8/8.5/9 but nope.
Seems related to jarscanner.....but no luck!


Because my servlet is in common to all projects I want to put it inside
tomcat/lib folder and share it to all my projects


Somebody can help me?


Many thanks,

Agharta





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Re: Tomcat 9 jar containing @webservlet annotation not loaded if inside tomcat/lib

markt
On 18/02/2021 10:46, [hidden email] wrote:

> Hi all,
>
> A question, I can't solve that....
>
> Tested with Tomcat 9.0.41, java 8 x64, linux (Fedora 32).
>
>
> I have a standard tomcat web.xml (3.0 or 3.1, no matter).
>
> I have created an external simple servlet with @WebServlet annotation,
> and packaged it to a jar file:

Name of the JAR file?

Package the Servlet has been placed in?

Standard Tomcat downloaded from the ASF or one provided by your package
manager?

Have you tried enabling debug logging for
org.apache.tomcat.util.scan.StandardJarScanner ?

Mark


>
>
> @WebServlet(name = "TestServlet", urlPatterns = {"/TestServlet"},
> loadOnStartup = 1)
> public class TestServlet extends HttpServlet {
>
>     private static final Logger log =
> Logger.getLogger(TestServlet.class.getName());
>
>     private static final long serialVersionUID = 1L;
>
>     @Override
>     public void init() throws ServletException {
>         log.setLevel(Level.ALL);
>         log.log(Level.WARNING, "TESTSERVLET INIT");
>         super.init();
>     }
>
>     @Override
>     public void destroy() {
>     }
>
>     @Override
>     protected void doGet(HttpServletRequest req, HttpServletResponse
> resp) throws ServletException, IOException {
>         processRequest(req, resp);
>     }
>
>     protected void processRequest(HttpServletRequest request,
> HttpServletResponse response)
>             throws ServletException, IOException {
>         response.setContentType("text/html;charset=UTF-8");
>         PrintWriter out = response.getWriter();
>
>         try {
>             out.println("<!DOCTYPE html>");
>             out.println("<html>");
>             out.println("<head>");
>             out.println("<title>Servlet TestServlet</title>");
>             out.println("</head>");
>             out.println("<body>");
>             out.println("<h1>Servlet TestServlet at " +
> request.getContextPath() + "</h1>");
>
>             out.println("</body>");
>             out.println("</html>");
>         } finally {
>             out.close();
>         }
>     }
>
> }
>
>
> So, if I copy the .jar file inside WEB-INF/lib folder of destination war
> project the log message will appears and the servlet is reachable.
>
> But, if I copy the .jar file inside tomcat/lib folder the annotation
> won't be processed.
>
>
> FYI, in tomcat 7 both cases (inside WEB-INF/lib and tomcat/lib) works well.
>
>
> I searched on breaking changes between tomcat 7 and 8/8.5/9 but nope.
> Seems related to jarscanner.....but no luck!
>
>
> Because my servlet is in common to all projects I want to put it inside
> tomcat/lib folder and share it to all my projects
>
>
> Somebody can help me?
>
>
> Many thanks,
>
> Agharta
>
>
>
>
>
>


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Re: Tomcat 9 jar containing @webservlet annotation not loaded if inside tomcat/lib

agharta82@gmail.com
Hi Mark,

Good questions, my mistake, sorry.

So:

jar file name is testannotation.jar

package is "aaa." (very simple)

Standard vanilla tomcat (.zip) downloaded from ASF site, no package
manager. Unzipped to my home directory.

org.apache.tomcat.util.scan.StandardJarScanner.level = FINE (enabled
inside tomcat/conf/logging.properties)

Result:

catalina.2021-02-18.log:18-Feb-2021 12:45:03.703 BUONO [main]
org.apache.tomcat.util.scan.StandardJarScanner.processURLs Scanning JAR
[file:/home/agharta/apache-tomcat-9.0.41/lib/testannotation.jar] from
classpath
catalina.2021-02-18.log:18-Feb-2021 12:45:06.178 BUONO
[http-nio-8082-exec-1]
org.apache.tomcat.util.scan.StandardJarScanner.processURLs Scanning JAR
[file:/home/agharta/apache-tomcat-9.0.41/lib/testannotation.jar] from
classpath

...no other messages involving testannotation.jar or TestServlet.....


Many thanks,

Agharta




Il 18/02/21 12:24, Mark Thomas ha scritto:

> On 18/02/2021 10:46, [hidden email] wrote:
>> Hi all,
>>
>> A question, I can't solve that....
>>
>> Tested with Tomcat 9.0.41, java 8 x64, linux (Fedora 32).
>>
>>
>> I have a standard tomcat web.xml (3.0 or 3.1, no matter).
>>
>> I have created an external simple servlet with @WebServlet annotation,
>> and packaged it to a jar file:
> Name of the JAR file?
>
> Package the Servlet has been placed in?
>
> Standard Tomcat downloaded from the ASF or one provided by your package
> manager?
>
> Have you tried enabling debug logging for
> org.apache.tomcat.util.scan.StandardJarScanner ?
>
> Mark
>
>
>>
>> @WebServlet(name = "TestServlet", urlPatterns = {"/TestServlet"},
>> loadOnStartup = 1)
>> public class TestServlet extends HttpServlet {
>>
>>      private static final Logger log =
>> Logger.getLogger(TestServlet.class.getName());
>>
>>      private static final long serialVersionUID = 1L;
>>
>>      @Override
>>      public void init() throws ServletException {
>>          log.setLevel(Level.ALL);
>>          log.log(Level.WARNING, "TESTSERVLET INIT");
>>          super.init();
>>      }
>>
>>      @Override
>>      public void destroy() {
>>      }
>>
>>      @Override
>>      protected void doGet(HttpServletRequest req, HttpServletResponse
>> resp) throws ServletException, IOException {
>>          processRequest(req, resp);
>>      }
>>
>>      protected void processRequest(HttpServletRequest request,
>> HttpServletResponse response)
>>              throws ServletException, IOException {
>>          response.setContentType("text/html;charset=UTF-8");
>>          PrintWriter out = response.getWriter();
>>
>>          try {
>>              out.println("<!DOCTYPE html>");
>>              out.println("<html>");
>>              out.println("<head>");
>>              out.println("<title>Servlet TestServlet</title>");
>>              out.println("</head>");
>>              out.println("<body>");
>>              out.println("<h1>Servlet TestServlet at " +
>> request.getContextPath() + "</h1>");
>>
>>              out.println("</body>");
>>              out.println("</html>");
>>          } finally {
>>              out.close();
>>          }
>>      }
>>
>> }
>>
>>
>> So, if I copy the .jar file inside WEB-INF/lib folder of destination war
>> project the log message will appears and the servlet is reachable.
>>
>> But, if I copy the .jar file inside tomcat/lib folder the annotation
>> won't be processed.
>>
>>
>> FYI, in tomcat 7 both cases (inside WEB-INF/lib and tomcat/lib) works well.
>>
>>
>> I searched on breaking changes between tomcat 7 and 8/8.5/9 but nope.
>> Seems related to jarscanner.....but no luck!
>>
>>
>> Because my servlet is in common to all projects I want to put it inside
>> tomcat/lib folder and share it to all my projects
>>
>>
>> Somebody can help me?
>>
>>
>> Many thanks,
>>
>> Agharta
>>
>>
>>
>>
>>
>>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: [hidden email]
> For additional commands, e-mail: [hidden email]
>

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Re: Tomcat 9 jar containing @webservlet annotation not loaded if inside tomcat/lib

agharta82@gmail.com
Hi,

FYI, tomcat 9.0.43 have this problem too.

Best Regards,

Agharta


Il 18/02/21 12:51, [hidden email] ha scritto:

> Hi Mark,
>
> Good questions, my mistake, sorry.
>
> So:
>
> jar file name is testannotation.jar
>
> package is "aaa." (very simple)
>
> Standard vanilla tomcat (.zip) downloaded from ASF site, no package
> manager. Unzipped to my home directory.
>
> org.apache.tomcat.util.scan.StandardJarScanner.level = FINE (enabled
> inside tomcat/conf/logging.properties)
>
> Result:
>
> catalina.2021-02-18.log:18-Feb-2021 12:45:03.703 BUONO [main]
> org.apache.tomcat.util.scan.StandardJarScanner.processURLs Scanning
> JAR [file:/home/agharta/apache-tomcat-9.0.41/lib/testannotation.jar]
> from classpath
> catalina.2021-02-18.log:18-Feb-2021 12:45:06.178 BUONO
> [http-nio-8082-exec-1]
> org.apache.tomcat.util.scan.StandardJarScanner.processURLs Scanning
> JAR [file:/home/agharta/apache-tomcat-9.0.41/lib/testannotation.jar]
> from classpath
>
> ...no other messages involving testannotation.jar or TestServlet.....
>
>
> Many thanks,
>
> Agharta
>
>
>
>
> Il 18/02/21 12:24, Mark Thomas ha scritto:
>> On 18/02/2021 10:46, [hidden email] wrote:
>>> Hi all,
>>>
>>> A question, I can't solve that....
>>>
>>> Tested with Tomcat 9.0.41, java 8 x64, linux (Fedora 32).
>>>
>>>
>>> I have a standard tomcat web.xml (3.0 or 3.1, no matter).
>>>
>>> I have created an external simple servlet with @WebServlet annotation,
>>> and packaged it to a jar file:
>> Name of the JAR file?
>>
>> Package the Servlet has been placed in?
>>
>> Standard Tomcat downloaded from the ASF or one provided by your package
>> manager?
>>
>> Have you tried enabling debug logging for
>> org.apache.tomcat.util.scan.StandardJarScanner ?
>>
>> Mark
>>
>>
>>>
>>> @WebServlet(name = "TestServlet", urlPatterns = {"/TestServlet"},
>>> loadOnStartup = 1)
>>> public class TestServlet extends HttpServlet {
>>>
>>>      private static final Logger log =
>>> Logger.getLogger(TestServlet.class.getName());
>>>
>>>      private static final long serialVersionUID = 1L;
>>>
>>>      @Override
>>>      public void init() throws ServletException {
>>>          log.setLevel(Level.ALL);
>>>          log.log(Level.WARNING, "TESTSERVLET INIT");
>>>          super.init();
>>>      }
>>>
>>>      @Override
>>>      public void destroy() {
>>>      }
>>>
>>>      @Override
>>>      protected void doGet(HttpServletRequest req, HttpServletResponse
>>> resp) throws ServletException, IOException {
>>>          processRequest(req, resp);
>>>      }
>>>
>>>      protected void processRequest(HttpServletRequest request,
>>> HttpServletResponse response)
>>>              throws ServletException, IOException {
>>>          response.setContentType("text/html;charset=UTF-8");
>>>          PrintWriter out = response.getWriter();
>>>
>>>          try {
>>>              out.println("<!DOCTYPE html>");
>>>              out.println("<html>");
>>>              out.println("<head>");
>>>              out.println("<title>Servlet TestServlet</title>");
>>>              out.println("</head>");
>>>              out.println("<body>");
>>>              out.println("<h1>Servlet TestServlet at " +
>>> request.getContextPath() + "</h1>");
>>>
>>>              out.println("</body>");
>>>              out.println("</html>");
>>>          } finally {
>>>              out.close();
>>>          }
>>>      }
>>>
>>> }
>>>
>>>
>>> So, if I copy the .jar file inside WEB-INF/lib folder of destination
>>> war
>>> project the log message will appears and the servlet is reachable.
>>>
>>> But, if I copy the .jar file inside tomcat/lib folder the annotation
>>> won't be processed.
>>>
>>>
>>> FYI, in tomcat 7 both cases (inside WEB-INF/lib and tomcat/lib)
>>> works well.
>>>
>>>
>>> I searched on breaking changes between tomcat 7 and 8/8.5/9 but nope.
>>> Seems related to jarscanner.....but no luck!
>>>
>>>
>>> Because my servlet is in common to all projects I want to put it inside
>>> tomcat/lib folder and share it to all my projects
>>>
>>>
>>> Somebody can help me?
>>>
>>>
>>> Many thanks,
>>>
>>> Agharta
>>>
>>>
>>>
>>>
>>>
>>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: [hidden email]
>> For additional commands, e-mail: [hidden email]
>>

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Re: Tomcat 9 jar containing @webservlet annotation not loaded if inside tomcat/lib

agharta82@gmail.com
Hi Mark,

I'm sorry to bother you, do you need more information about that? (see
email below, my mistake about reply recipient)

Many Thanks,

Agharta




Il 18/02/21 13:09, [hidden email] ha scritto:

> Hi,
>
> FYI, tomcat 9.0.43 have this problem too.
>
> Best Regards,
>
> Agharta
>
>
> Il 18/02/21 12:51, [hidden email] ha scritto:
>> Hi Mark,
>>
>> Good questions, my mistake, sorry.
>>
>> So:
>>
>> jar file name is testannotation.jar
>>
>> package is "aaa." (very simple)
>>
>> Standard vanilla tomcat (.zip) downloaded from ASF site, no package
>> manager. Unzipped to my home directory.
>>
>> org.apache.tomcat.util.scan.StandardJarScanner.level = FINE (enabled
>> inside tomcat/conf/logging.properties)
>>
>> Result:
>>
>> catalina.2021-02-18.log:18-Feb-2021 12:45:03.703 BUONO [main]
>> org.apache.tomcat.util.scan.StandardJarScanner.processURLs Scanning
>> JAR [file:/home/agharta/apache-tomcat-9.0.41/lib/testannotation.jar]
>> from classpath
>> catalina.2021-02-18.log:18-Feb-2021 12:45:06.178 BUONO
>> [http-nio-8082-exec-1]
>> org.apache.tomcat.util.scan.StandardJarScanner.processURLs Scanning
>> JAR [file:/home/agharta/apache-tomcat-9.0.41/lib/testannotation.jar]
>> from classpath
>>
>> ...no other messages involving testannotation.jar or TestServlet.....
>>
>>
>> Many thanks,
>>
>> Agharta
>>
>>
>>
>>
>> Il 18/02/21 12:24, Mark Thomas ha scritto:
>>> On 18/02/2021 10:46, [hidden email] wrote:
>>>> Hi all,
>>>>
>>>> A question, I can't solve that....
>>>>
>>>> Tested with Tomcat 9.0.41, java 8 x64, linux (Fedora 32).
>>>>
>>>>
>>>> I have a standard tomcat web.xml (3.0 or 3.1, no matter).
>>>>
>>>> I have created an external simple servlet with @WebServlet annotation,
>>>> and packaged it to a jar file:
>>> Name of the JAR file?
>>>
>>> Package the Servlet has been placed in?
>>>
>>> Standard Tomcat downloaded from the ASF or one provided by your package
>>> manager?
>>>
>>> Have you tried enabling debug logging for
>>> org.apache.tomcat.util.scan.StandardJarScanner ?
>>>
>>> Mark
>>>
>>>
>>>>
>>>> @WebServlet(name = "TestServlet", urlPatterns = {"/TestServlet"},
>>>> loadOnStartup = 1)
>>>> public class TestServlet extends HttpServlet {
>>>>
>>>>      private static final Logger log =
>>>> Logger.getLogger(TestServlet.class.getName());
>>>>
>>>>      private static final long serialVersionUID = 1L;
>>>>
>>>>      @Override
>>>>      public void init() throws ServletException {
>>>>          log.setLevel(Level.ALL);
>>>>          log.log(Level.WARNING, "TESTSERVLET INIT");
>>>>          super.init();
>>>>      }
>>>>
>>>>      @Override
>>>>      public void destroy() {
>>>>      }
>>>>
>>>>      @Override
>>>>      protected void doGet(HttpServletRequest req, HttpServletResponse
>>>> resp) throws ServletException, IOException {
>>>>          processRequest(req, resp);
>>>>      }
>>>>
>>>>      protected void processRequest(HttpServletRequest request,
>>>> HttpServletResponse response)
>>>>              throws ServletException, IOException {
>>>>          response.setContentType("text/html;charset=UTF-8");
>>>>          PrintWriter out = response.getWriter();
>>>>
>>>>          try {
>>>>              out.println("<!DOCTYPE html>");
>>>>              out.println("<html>");
>>>>              out.println("<head>");
>>>>              out.println("<title>Servlet TestServlet</title>");
>>>>              out.println("</head>");
>>>>              out.println("<body>");
>>>>              out.println("<h1>Servlet TestServlet at " +
>>>> request.getContextPath() + "</h1>");
>>>>
>>>>              out.println("</body>");
>>>>              out.println("</html>");
>>>>          } finally {
>>>>              out.close();
>>>>          }
>>>>      }
>>>>
>>>> }
>>>>
>>>>
>>>> So, if I copy the .jar file inside WEB-INF/lib folder of
>>>> destination war
>>>> project the log message will appears and the servlet is reachable.
>>>>
>>>> But, if I copy the .jar file inside tomcat/lib folder the annotation
>>>> won't be processed.
>>>>
>>>>
>>>> FYI, in tomcat 7 both cases (inside WEB-INF/lib and tomcat/lib)
>>>> works well.
>>>>
>>>>
>>>> I searched on breaking changes between tomcat 7 and 8/8.5/9 but nope.
>>>> Seems related to jarscanner.....but no luck!
>>>>
>>>>
>>>> Because my servlet is in common to all projects I want to put it
>>>> inside
>>>> tomcat/lib folder and share it to all my projects
>>>>
>>>>
>>>> Somebody can help me?
>>>>
>>>>
>>>> Many thanks,
>>>>
>>>> Agharta
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: [hidden email]
>>> For additional commands, e-mail: [hidden email]
>>>

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Re: Tomcat 9 jar containing @webservlet annotation not loaded if inside tomcat/lib

markt
On 19/02/2021 09:45, [hidden email] wrote:
> Hi Mark,
>
> I'm sorry to bother you, do you need more information about that? (see
> email below, my mistake about reply recipient)

Please see section 8.1 of the Servlet specification.

<quote>
In a web application, classes using annotations will have their
annotations processed only if they are located in the WEB-INF/classes
directory, or if they are packaged in a jar file located in WEB-INF/lib
within the application.
</quote>

The same requirement was present in Servlet 3.0 / Tomcat 7 but not enforced.

Mark



>
> Many Thanks,
>
> Agharta
>
>
>
>
> Il 18/02/21 13:09, [hidden email] ha scritto:
>> Hi,
>>
>> FYI, tomcat 9.0.43 have this problem too.
>>
>> Best Regards,
>>
>> Agharta
>>
>>
>> Il 18/02/21 12:51, [hidden email] ha scritto:
>>> Hi Mark,
>>>
>>> Good questions, my mistake, sorry.
>>>
>>> So:
>>>
>>> jar file name is testannotation.jar
>>>
>>> package is "aaa." (very simple)
>>>
>>> Standard vanilla tomcat (.zip) downloaded from ASF site, no package
>>> manager. Unzipped to my home directory.
>>>
>>> org.apache.tomcat.util.scan.StandardJarScanner.level = FINE (enabled
>>> inside tomcat/conf/logging.properties)
>>>
>>> Result:
>>>
>>> catalina.2021-02-18.log:18-Feb-2021 12:45:03.703 BUONO [main]
>>> org.apache.tomcat.util.scan.StandardJarScanner.processURLs Scanning
>>> JAR [file:/home/agharta/apache-tomcat-9.0.41/lib/testannotation.jar]
>>> from classpath
>>> catalina.2021-02-18.log:18-Feb-2021 12:45:06.178 BUONO
>>> [http-nio-8082-exec-1]
>>> org.apache.tomcat.util.scan.StandardJarScanner.processURLs Scanning
>>> JAR [file:/home/agharta/apache-tomcat-9.0.41/lib/testannotation.jar]
>>> from classpath
>>>
>>> ...no other messages involving testannotation.jar or TestServlet.....
>>>
>>>
>>> Many thanks,
>>>
>>> Agharta
>>>
>>>
>>>
>>>
>>> Il 18/02/21 12:24, Mark Thomas ha scritto:
>>>> On 18/02/2021 10:46, [hidden email] wrote:
>>>>> Hi all,
>>>>>
>>>>> A question, I can't solve that....
>>>>>
>>>>> Tested with Tomcat 9.0.41, java 8 x64, linux (Fedora 32).
>>>>>
>>>>>
>>>>> I have a standard tomcat web.xml (3.0 or 3.1, no matter).
>>>>>
>>>>> I have created an external simple servlet with @WebServlet annotation,
>>>>> and packaged it to a jar file:
>>>> Name of the JAR file?
>>>>
>>>> Package the Servlet has been placed in?
>>>>
>>>> Standard Tomcat downloaded from the ASF or one provided by your package
>>>> manager?
>>>>
>>>> Have you tried enabling debug logging for
>>>> org.apache.tomcat.util.scan.StandardJarScanner ?
>>>>
>>>> Mark
>>>>
>>>>
>>>>>
>>>>> @WebServlet(name = "TestServlet", urlPatterns = {"/TestServlet"},
>>>>> loadOnStartup = 1)
>>>>> public class TestServlet extends HttpServlet {
>>>>>
>>>>>      private static final Logger log =
>>>>> Logger.getLogger(TestServlet.class.getName());
>>>>>
>>>>>      private static final long serialVersionUID = 1L;
>>>>>
>>>>>      @Override
>>>>>      public void init() throws ServletException {
>>>>>          log.setLevel(Level.ALL);
>>>>>          log.log(Level.WARNING, "TESTSERVLET INIT");
>>>>>          super.init();
>>>>>      }
>>>>>
>>>>>      @Override
>>>>>      public void destroy() {
>>>>>      }
>>>>>
>>>>>      @Override
>>>>>      protected void doGet(HttpServletRequest req, HttpServletResponse
>>>>> resp) throws ServletException, IOException {
>>>>>          processRequest(req, resp);
>>>>>      }
>>>>>
>>>>>      protected void processRequest(HttpServletRequest request,
>>>>> HttpServletResponse response)
>>>>>              throws ServletException, IOException {
>>>>>          response.setContentType("text/html;charset=UTF-8");
>>>>>          PrintWriter out = response.getWriter();
>>>>>
>>>>>          try {
>>>>>              out.println("<!DOCTYPE html>");
>>>>>              out.println("<html>");
>>>>>              out.println("<head>");
>>>>>              out.println("<title>Servlet TestServlet</title>");
>>>>>              out.println("</head>");
>>>>>              out.println("<body>");
>>>>>              out.println("<h1>Servlet TestServlet at " +
>>>>> request.getContextPath() + "</h1>");
>>>>>
>>>>>              out.println("</body>");
>>>>>              out.println("</html>");
>>>>>          } finally {
>>>>>              out.close();
>>>>>          }
>>>>>      }
>>>>>
>>>>> }
>>>>>
>>>>>
>>>>> So, if I copy the .jar file inside WEB-INF/lib folder of
>>>>> destination war
>>>>> project the log message will appears and the servlet is reachable.
>>>>>
>>>>> But, if I copy the .jar file inside tomcat/lib folder the annotation
>>>>> won't be processed.
>>>>>
>>>>>
>>>>> FYI, in tomcat 7 both cases (inside WEB-INF/lib and tomcat/lib)
>>>>> works well.
>>>>>
>>>>>
>>>>> I searched on breaking changes between tomcat 7 and 8/8.5/9 but nope.
>>>>> Seems related to jarscanner.....but no luck!
>>>>>
>>>>>
>>>>> Because my servlet is in common to all projects I want to put it
>>>>> inside
>>>>> tomcat/lib folder and share it to all my projects
>>>>>
>>>>>
>>>>> Somebody can help me?
>>>>>
>>>>>
>>>>> Many thanks,
>>>>>
>>>>> Agharta
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
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Re: Tomcat 9 jar containing @webservlet annotation not loaded if inside tomcat/lib

agharta82@gmail.com
Hi Mark,

Ok, all clear, thanks.
Since the servlet is used by several projects, I force it to be loaded
via web.xml

Thanks again,

Agharta


Il 22/02/21 12:02, Mark Thomas ha scritto:

> On 19/02/2021 09:45, [hidden email] wrote:
>> Hi Mark,
>>
>> I'm sorry to bother you, do you need more information about that? (see
>> email below, my mistake about reply recipient)
> Please see section 8.1 of the Servlet specification.
>
> <quote>
> In a web application, classes using annotations will have their
> annotations processed only if they are located in the WEB-INF/classes
> directory, or if they are packaged in a jar file located in WEB-INF/lib
> within the application.
> </quote>
>
> The same requirement was present in Servlet 3.0 / Tomcat 7 but not enforced.
>
> Mark
>
>
>
>> Many Thanks,
>>
>> Agharta
>>
>>
>>
>>
>> Il 18/02/21 13:09, [hidden email] ha scritto:
>>> Hi,
>>>
>>> FYI, tomcat 9.0.43 have this problem too.
>>>
>>> Best Regards,
>>>
>>> Agharta
>>>
>>>
>>> Il 18/02/21 12:51, [hidden email] ha scritto:
>>>> Hi Mark,
>>>>
>>>> Good questions, my mistake, sorry.
>>>>
>>>> So:
>>>>
>>>> jar file name is testannotation.jar
>>>>
>>>> package is "aaa." (very simple)
>>>>
>>>> Standard vanilla tomcat (.zip) downloaded from ASF site, no package
>>>> manager. Unzipped to my home directory.
>>>>
>>>> org.apache.tomcat.util.scan.StandardJarScanner.level = FINE (enabled
>>>> inside tomcat/conf/logging.properties)
>>>>
>>>> Result:
>>>>
>>>> catalina.2021-02-18.log:18-Feb-2021 12:45:03.703 BUONO [main]
>>>> org.apache.tomcat.util.scan.StandardJarScanner.processURLs Scanning
>>>> JAR [file:/home/agharta/apache-tomcat-9.0.41/lib/testannotation.jar]
>>>> from classpath
>>>> catalina.2021-02-18.log:18-Feb-2021 12:45:06.178 BUONO
>>>> [http-nio-8082-exec-1]
>>>> org.apache.tomcat.util.scan.StandardJarScanner.processURLs Scanning
>>>> JAR [file:/home/agharta/apache-tomcat-9.0.41/lib/testannotation.jar]
>>>> from classpath
>>>>
>>>> ...no other messages involving testannotation.jar or TestServlet.....
>>>>
>>>>
>>>> Many thanks,
>>>>
>>>> Agharta
>>>>
>>>>
>>>>
>>>>
>>>> Il 18/02/21 12:24, Mark Thomas ha scritto:
>>>>> On 18/02/2021 10:46, [hidden email] wrote:
>>>>>> Hi all,
>>>>>>
>>>>>> A question, I can't solve that....
>>>>>>
>>>>>> Tested with Tomcat 9.0.41, java 8 x64, linux (Fedora 32).
>>>>>>
>>>>>>
>>>>>> I have a standard tomcat web.xml (3.0 or 3.1, no matter).
>>>>>>
>>>>>> I have created an external simple servlet with @WebServlet annotation,
>>>>>> and packaged it to a jar file:
>>>>> Name of the JAR file?
>>>>>
>>>>> Package the Servlet has been placed in?
>>>>>
>>>>> Standard Tomcat downloaded from the ASF or one provided by your package
>>>>> manager?
>>>>>
>>>>> Have you tried enabling debug logging for
>>>>> org.apache.tomcat.util.scan.StandardJarScanner ?
>>>>>
>>>>> Mark
>>>>>
>>>>>
>>>>>> @WebServlet(name = "TestServlet", urlPatterns = {"/TestServlet"},
>>>>>> loadOnStartup = 1)
>>>>>> public class TestServlet extends HttpServlet {
>>>>>>
>>>>>>       private static final Logger log =
>>>>>> Logger.getLogger(TestServlet.class.getName());
>>>>>>
>>>>>>       private static final long serialVersionUID = 1L;
>>>>>>
>>>>>>       @Override
>>>>>>       public void init() throws ServletException {
>>>>>>           log.setLevel(Level.ALL);
>>>>>>           log.log(Level.WARNING, "TESTSERVLET INIT");
>>>>>>           super.init();
>>>>>>       }
>>>>>>
>>>>>>       @Override
>>>>>>       public void destroy() {
>>>>>>       }
>>>>>>
>>>>>>       @Override
>>>>>>       protected void doGet(HttpServletRequest req, HttpServletResponse
>>>>>> resp) throws ServletException, IOException {
>>>>>>           processRequest(req, resp);
>>>>>>       }
>>>>>>
>>>>>>       protected void processRequest(HttpServletRequest request,
>>>>>> HttpServletResponse response)
>>>>>>               throws ServletException, IOException {
>>>>>>           response.setContentType("text/html;charset=UTF-8");
>>>>>>           PrintWriter out = response.getWriter();
>>>>>>
>>>>>>           try {
>>>>>>               out.println("<!DOCTYPE html>");
>>>>>>               out.println("<html>");
>>>>>>               out.println("<head>");
>>>>>>               out.println("<title>Servlet TestServlet</title>");
>>>>>>               out.println("</head>");
>>>>>>               out.println("<body>");
>>>>>>               out.println("<h1>Servlet TestServlet at " +
>>>>>> request.getContextPath() + "</h1>");
>>>>>>
>>>>>>               out.println("</body>");
>>>>>>               out.println("</html>");
>>>>>>           } finally {
>>>>>>               out.close();
>>>>>>           }
>>>>>>       }
>>>>>>
>>>>>> }
>>>>>>
>>>>>>
>>>>>> So, if I copy the .jar file inside WEB-INF/lib folder of
>>>>>> destination war
>>>>>> project the log message will appears and the servlet is reachable.
>>>>>>
>>>>>> But, if I copy the .jar file inside tomcat/lib folder the annotation
>>>>>> won't be processed.
>>>>>>
>>>>>>
>>>>>> FYI, in tomcat 7 both cases (inside WEB-INF/lib and tomcat/lib)
>>>>>> works well.
>>>>>>
>>>>>>
>>>>>> I searched on breaking changes between tomcat 7 and 8/8.5/9 but nope.
>>>>>> Seems related to jarscanner.....but no luck!
>>>>>>
>>>>>>
>>>>>> Because my servlet is in common to all projects I want to put it
>>>>>> inside
>>>>>> tomcat/lib folder and share it to all my projects
>>>>>>
>>>>>>
>>>>>> Somebody can help me?
>>>>>>
>>>>>>
>>>>>> Many thanks,
>>>>>>
>>>>>> Agharta
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
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