Custom Servlet in web.xml

[13年前 に Gaurav Vaish によって更新されました。]

Hi,

I want to write a custom servlet in Liferay. I have done the following:

Created, compiled the code and create a jar, say, custom-servlet.jar
Added the jar in WEB-INF/lib folder
Registered the class in WEB-INF/web.xml file

It's a very simple servlet - "doGet(...) { out.println("Hello, World!"); }" types.

When I browse to the URL, I get the error "404 Page Not Found".
On the console, I see the error "[PortalImpl:3812] Current URL /liferayportalapp/uss generates exception: null".

Please help.

[13年前 に Gaurav Vaish によって更新されました。]

Gaurav Vaish:

When I browse to the URL, I get the error "404 Page Not Found".
On the console, I see the error "[PortalImpl:3812] Current URL /liferayportalapp/uss generates exception: null".

Investing in some more detail... the actual exception seems to be "NoSuchLayoutException".

[13年前 に Amos Fong によって更新されました。]

Hi Gaurav,

Can you post your web.xml changes? Is this the portal web.xml or a custom portlet?

[13年前 に Gaurav Vaish によって更新されました。]

It's the portal web.xml

<servlet>
	<servlet-name>hwServlet</servlet-name>
	<servlet-class>com.xyz.HelloLRServlet</servlet-class>
	<load-on-startup>2</load-on-startup>
</servlet>

<servlet-mapping>
	<servlet-name>hwServlet</servlet-name>
	<url-pattern>/abcd/servlets/hw</url-pattern>
</servlet-mapping>

In tomcat, it's the {tomcat-root}/webapps/ROOT/WEB-INF/web.xml configuration file.

[13年前 に Mati Khan によって更新されました。]

Hi,

If you are using a portlet plugin, its easy to add in web.xml file servlet entry and it will work.

Can you explain why you need it in a jar file?

[13年前 に song jh によって更新されました。]

I have the same question!

[13年前 に David H Nebinger によって更新されました。]

Gaurav Vaish:

It's the portal web.xml

<servlet>
	<servlet-name>hwServlet</servlet-name>
	<servlet-class>com.xyz.HelloLRServlet</servlet-class>
	<load-on-startup>2</load-on-startup>
</servlet>

<servlet-mapping>
	<servlet-name>hwServlet</servlet-name>
	<url-pattern>/abcd/servlets/hw</url-pattern>
</servlet-mapping>

In tomcat, it's the {tomcat-root}/webapps/ROOT/WEB-INF/web.xml configuration file.

By adding the servlet into liferay, you have to remember that the servlet filters will be invoked, which is probably the source of your exception...

The bigger question is why it needs to be part of liferay... For example, if you've got portlet code you also want exposed as a servlet, then you build a separate portlet project (war) and add the necessary servlet info in there; that way you control the servlet filter(s), mappings, etc.

[13年前 に Gaurav Vaish によって更新されました。]

Hi David,

David H Nebinger:

The bigger question is why it needs to be part of liferay... For example, if you've got portlet code you also want exposed as a servlet, then you build a separate portlet project (war) and add the necessary servlet info in there; that way you control the servlet filter(s), mappings, etc.

Thanks for the pointers...

I have been able to crack the puzzle.

Created a custom portlet.
I totally missed out the point that the portlets are also available at "/portlet-id" context path. Created a servlet there and am using that.

Thanks.

--
Gaurav
http://www.incoleg.com

[13年前 に Stephan Huber によって更新されました。]

Hi Gaurav,

did edit the web.xml within the deployed liferay directly on the application server?
We have similiar problems with liferay 6 and GlassFish.
Changes in the web.xml directly on the server are ignored by GlassFish even after restarting!

Workaround:

1. Undeploy liferay-portal-6.0.5.war
2. Copy the new web.xml into WEB-INF/ in liferay-portal-6.0.5.war
3. Redeploy liferay-portal-6.0.5.war

This worked for us!

Regards,
Stephan

[10年前 に Erick Christian Rosales Cruz によって更新されました。]

Hi, I used the Liferay Portal bundled with Tomcat. how can I undeploy the liferay_portal.war?

Thanks. I've missing a lot ot time trying to fix this but I haven't been able to achieve this.

[10年前 に Erick Christian Rosales Cruz によって更新されました。]

Stephan Huber:

Hi Gaurav,

did edit the web.xml within the deployed liferay directly on the application server?
We have similiar problems with liferay 6 and GlassFish.
Changes in the web.xml directly on the server are ignored by GlassFish even after restarting!

Workaround:

1. Undeploy liferay-portal-6.0.5.war
2. Copy the new web.xml into WEB-INF/ in liferay-portal-6.0.5.war
3. Redeploy liferay-portal-6.0.5.war

This worked for us!

Regards,
Stephan

Hi Stephan... IS there any other way to modify the web.xml...

I'm triyng to integrate the Crystal Reports Viewer but I'ev got is:
POST http://localhost:8080/CrystalReportViewerHandler 404 (No Encontrado) --- Not Found
Here is the web.xml from

liferay-portlet \ docroot \ WEB-INF \ web.xml

and this is the content:

<!--?xml version="1.0" encoding="UTF-8"?-->
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemalocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
	<servlet-mapping>
		<servlet-name>CrystalReportViewerServlet</servlet-name>
		<url-pattern>/CrystalReportViewerHandler</url-pattern>
	</servlet-mapping>

	<servlet>
		<servlet-name>CrystalReportViewerServlet</servlet-name>
		<servlet-class>com.crystaldecisions.report.web.viewer.CrystalReportViewerServlet</servlet-class>
	</servlet>
	<context-param>
		<param-name>crystal_image_uri</param-name>
		<param-value>/crystalreportviewers</param-value>
	</context-param>

	<context-param>
		<param-name>crystal_servlet_uri</param-name>
		<param-value>/CrystalReportViewerHandler</param-value>
	</context-param>
	<context-param>
		<param-name>crystal_image_use_relative</param-name>
		<param-value>webapp</param-value>
	</context-param>
	
	<context-param>
    <param-name>crystal_exception_info</param-name>
    <param-value>long</param-value>
    </context-param>  	
</web-app>

What am I doing wrong!!!!

As some other people has been experienced... The Crystal Report (MyReport.rpt File) is rendering only the first page, but when you try to navigate to the next page or try to print you got that error.... POST http://localhost:8080/CrystalReportViewerHandler 404 (No Encontrado) --- Not Found

Could anyone help me!?

[9年前 に Javier Vera によって更新されました。]

hey man did you manage to achieve this servlet thing?
peace

[8年前 に John Voltaire Maximo によって更新されました。]

can I do this on my custom-portlet's web.xml??