@ page import=..... OR jsp:useBean id.....
I'm a newbie in JSP, and I found uses <@ page import=.....> to run the java (*.class) is similar as uses <jsp:useBean id.....>, can anyone tell me what's the different between them??
Thx a lot~
I didn't find any necessary to use "import" tag before use "<jsp:useBean...>" when I used "Weblogic 5.1/6.0", "JRun 3.0/3.1". But I'm sure "Tomcat4.0" have to "import" first. Some documents showed the "import" tag was not necessary in "Tomcat" before version "4.0". I don't know the special feature from this version is good or not. Could someone tell me whether it's the future feature in JSP?
Similar Messages
-
Jsp:useBean vs page import in JSP
Hi,
What is the difference between jsp:useBean vs page import in JSP?
By using page import also I can call the method of the class, apart from jsp:useBean does have scope associated with it. I don't think there is any change between both the 2. Yes by using jsp:useBean we can set the property and get the property as well.
Is there any major differences between the 2 and when to use which ? Please clarify.
Thanks.797836 wrote:
Hi,
What is the difference between jsp:useBean vs page import in JSP?
By using page import also I can call the method of the class, apart from jsp:useBean does have scope associated with it. I don't think there is any change between both the 2. Yes by using jsp:useBean we can set the property and get the property as well.
Is there any major differences between the 2 and when to use which ? Please clarify.
Thanks.Yes there is a difference.
If you use import, then you have to create/use the reference object to use the class methods. And you can't define the scopes like session, page .. etc. Apart from this you will be using scriptlets <% %>.
if you are using jsp:useBean , then you can skip the above activities. useBean takes care of it.
or you can say jsp has provided a utility to access the beans without creating its object or using scriptlets. -
Jsp:usebean, @page import & CLASSPATH
I hav given jsp:usebean for using the classes and then used import package mypack.* in my jsp file. But this is not recognised. I tried putting mypack (which has the class files) in webapps/ROOT/WEB-INF/classes. Still it is not working. My jsp working directory is /usr/tomcat405/webapps/examples/jsp/mydir wher my jsp file resides. I tried giving this dir in CLASSPATH and exported it in my .bashrc file in my linux system. Still the import is not working. What could b the reason?
If you put your jsp in the examples context, then put your classes into
/usr/tomcat405/webapps/examples/WEB-INF/classes/mypack
This should work even without the import line because the "classes" directory is in Tomcat's classpath.
Also be aware of case sensitivity.
hav given jsp:usebean you should use
<jsp:useBean (upper case B) -
Which one better to use - jsp:useBean or import statement
Hi,
I just want to know that which one is better to use jsp:useBean or import statement .
I can instantiate and call method of myclass -
1) by importing the class through import tag in jsp as <%@page import="myclass"%. or
2). by using <jsp:useBean tag....
i have these two option to do the same thing. i know that basically useBean is used to call setter and getter method of bean class and but it can be used to call a normal java file that have some logic .
so what should i used , which one is better and why?
useBean provides scope and object instance so no need to create object by new operator. and with import you have to create an instance .
but which tag should i use in my jsp?
i am confused???ok, means i can use jsp:useBean tag for all my
classes that are not actually bean. so it will be
instantiated at run time and provide efficiency .No. Jsp:useBean is used for java bean components.
>
but when should i use import statement in my jsp and
it happen at translation time so will it create any
type of burden for my code if i import multiple
classes.For non-java beans, you need to import the classes, period.
It's not a burden, it's a necessity. -
Trying to page import directive in a JSP access a class in default package
I am trying to import a class the is in my default package directory for Tomcat 4.1.18 (context-root\web-inf\classes\*.java). I am getting the following error
This is error using Tomcat 4.1.18
org.apache.jasper.JasperException:Unable to compile class for JSP
C:\Program Files\Tomcat4.1\work\Standalone\localhost\csc297\HTML\SearchByName_jsp.java:9: '.' expected
import Product;
C:\Program Files\Tomcat4.1\work\Standalone\localhost\csc297\HTML\SearchByName_jsp.java:10: '.' expected
import Category;
This is error using Tomcat 4.0.6
org.apache.jasper.JasperException: Unable to compile class for JSPNote: sun.tools.javac.Main has been deprecated.
C:\forte4j\tomcat401\work\localhost\C_3A_5Cforte4j_5Ctomcat401_5Cwebapps_5Ccsc297\HTML\SearchByName$jsp.java:5: Class Product not found in import.
import Product;
^
C:\forte4j\tomcat401\work\localhost\C_3A_5Cforte4j_5Ctomcat401_5Cwebapps_5Ccsc297\HTML\SearchByName$jsp.java:6: Class Category not found in import.
import Category;
Here is snippet of code from my JSP:
<%@ page import= "java.util.*"%>
<%@ page import= "java.text.DecimalFormat"%>
<%@ page import="Product"%>
<%@ page import="Category"%>
Remember these classes are in my default package of my context-root
Any ideas would greatly appreciatedWeird error. Never seen this one before.
Try packaging your classes eg:package myClasses;and import them:<%@page import="myClasses.*"%>Should fix the problem.
Anthony -
Importing visual jsf page into another jsp page
Hi
I am developing a web application using jsp and struts. I want to embed a visual jsf page that Ive created into another jsp page (which is a normal jsp page, not a jsf one.)
Ive tried quite a few things but nothing seems to work..
<jsp:include page="Page2.jsp">
Ive surrounded the code in the f:subview tags. still doesnt work.
Ive tried using <jsp:useBean id="Page2" scope="page" class="visualwebapplication.Page2" > .. It does not give me an error, but does not embed the page as well. Do I need to some other code after this to use the above bean to display the page.
Any help would be greatly appreciated.
Regards
Sparsh AgarwalHi
This is the error message that is generated in the tomcat log once i try to load the homePage.do
Jul 31, 2008 2:27:47 PM org.apache.catalina.core.ApplicationContext log
SEVERE: Cannot forward after response has been committed
java.lang.IllegalStateException: Cannot forward after response has been committed
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:302)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:408)
at com.sun.faces.application.ViewHandlerImpl.executePageToBuildView(ViewHandlerImpl.java:442)
at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:115)
at com.sun.rave.web.ui.appbase.faces.ViewHandlerImpl.renderView(ViewHandlerImpl.java:320)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
at com.sun.faces.extensions.avatar.lifecycle.PartialTraversalLifecycle.render(PartialTraversalLifecycle.java:106)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:557)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:481)
at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968)
at org.apache.jsp.view.main_005fright_jsp._jspService(main_005fright_jsp.java:54)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:557)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:481)
at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968)
at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:609)
at org.apache.struts.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:99)
at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:135)
at org.apache.struts.taglib.tiles.InsertTag.doInclude(InsertTag.java:760)
at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:892)
at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:462)
at org.apache.jsp.view.templates.layoutBase_jsp._jspx_meth_tiles_005finsert_005f5(layoutBase_jsp.java:255)
at org.apache.jsp.view.templates.layoutBase_jsp._jspService(layoutBase_jsp.java:120)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:445)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263)
at org.apache.struts.tiles.TilesRequestProcessor.processTilesDefinition(TilesRequestProcessor.java:239)
at org.apache.struts.tiles.TilesRequestProcessor.internalModuleRelativeForward(TilesRequestProcessor.java:341)
at org.apache.struts.action.RequestProcessor.processForward(RequestProcessor.java:572)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:221)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
Jul 31, 2008 2:27:47 PM org.apache.catalina.core.ApplicationDispatcher invoke
SEVERE: Servlet.service() for servlet Faces Servlet threw exception
java.lang.IllegalStateException: Cannot forward after response has been committed
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:302)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:408)
at com.sun.faces.application.ViewHandlerImpl.executePageToBuildView(ViewHandlerImpl.java:442)
at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:115)
at com.sun.rave.web.ui.appbase.faces.ViewHandlerImpl.renderView(ViewHandlerImpl.java:320)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
at com.sun.faces.extensions.avatar.lifecycle.PartialTraversalLifecycle.render(PartialTraversalLifecycle.java:106)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:557)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:481)
at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968)
at org.apache.jsp.view.main_005fright_jsp._jspService(main_005fright_jsp.java:54)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:557)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:481)
at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968)
at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:609)
at org.apache.struts.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:99)
at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:135)
at org.apache.struts.taglib.tiles.InsertTag.doInclude(InsertTag.java:760)
at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:892)
at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:462)
at org.apache.jsp.view.templates.layoutBase_jsp._jspx_meth_tiles_005finsert_005f5(layoutBase_jsp.java:255)
at org.apache.jsp.view.templates.layoutBase_jsp._jspService(layoutBase_jsp.java:120)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:445)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263)
at org.apache.struts.tiles.TilesRequestProcessor.processTilesDefinition(TilesRequestProcessor.java:239)
at org.apache.struts.tiles.TilesRequestProcessor.internalModuleRelativeForward(TilesRequestProcessor.java:341)
at org.apache.struts.action.RequestProcessor.processForward(RequestProcessor.java:572)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:221)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
Jul 31, 2008 2:27:47 PM org.apache.catalina.core.ApplicationDispatcher invoke
SEVERE: Servlet.service() for servlet jsp threw exception
java.lang.IllegalStateException: Cannot forward after response has been committed
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:302)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:408)
at com.sun.faces.application.ViewHandlerImpl.executePageToBuildView(ViewHandlerImpl.java:442)
at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:115)
at com.sun.rave.web.ui.appbase.faces.ViewHandlerImpl.renderView(ViewHandlerImpl.java:320)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
at com.sun.faces.extensions.avatar.lifecycle.PartialTraversalLifecycle.render(PartialTraversalLifecycle.java:106)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:557)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:481)
at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968)
at org.apache.jsp.view.main_005fright_jsp._jspService(main_005fright_jsp.java:54)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:557)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:481)
at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968)
at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:609)
at org.apache.struts.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:99)
at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:135)
at org.apache.struts.taglib.tiles.InsertTag.doInclude(InsertTag.java:760)
at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:892)
at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:462)
at org.apache.jsp.view.templates.layoutBase_jsp._jspx_meth_tiles_005finsert_005f5(layoutBase_jsp.java:255)
at org.apache.jsp.view.templates.layoutBase_jsp._jspService(layoutBase_jsp.java:120)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:445)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263)
at org.apache.struts.tiles.TilesRequestProcessor.processTilesDefinition(TilesRequestProcessor.java:239)
at org.apache.struts.tiles.TilesRequestProcessor.internalModuleRelativeForward(TilesRequestProcessor.java:341)
at org.apache.struts.action.RequestProcessor.processForward(RequestProcessor.java:572)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:221)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
Jul 31, 2008 2:27:47 PM org.apache.catalina.core.ApplicationDispatcher invoke
SEVERE: Servlet.service() for servlet jsp threw exception
javax.servlet.jsp.JspException: ServletException in '/view/main_right.jsp': Cannot forward after response has been committed
at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:923)
at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:462)
at org.apache.jsp.view.templates.layoutBase_jsp._jspx_meth_tiles_005finsert_005f5(layoutBase_jsp.java:255)
at org.apache.jsp.view.templates.layoutBase_jsp._jspService(layoutBase_jsp.java:120)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:445)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263)
at org.apache.struts.tiles.TilesRequestProcessor.processTilesDefinition(TilesRequestProcessor.java:239)
at org.apache.struts.tiles.TilesRequestProcessor.internalModuleRelativeForward(TilesRequestProcessor.java:341)
at org.apache.struts.action.RequestProcessor.processForward(RequestProcessor.java:572)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:221)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
Jul 31, 2008 2:27:47 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet action threw exception
javax.servlet.jsp.JspException: ServletException in '/view/main_right.jsp': Cannot forward after response has been committed
at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:923)
at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:462)
at org.apache.jsp.view.templates.layoutBase_jsp._jspx_meth_tiles_005finsert_005f5(layoutBase_jsp.java:255)
at org.apache.jsp.view.templates.layoutBase_jsp._jspService(layoutBase_jsp.java:120)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:445)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263)
at org.apache.struts.tiles.TilesRequestProcessor.processTilesDefinition(TilesRequestProcessor.java:239)
at org.apache.struts.tiles.TilesRequestProcessor.internalModuleRelativeForward(TilesRequestProcessor.java:341)
at org.apache.struts.action.RequestProcessor.processForward(RequestProcessor.java:572)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:221)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619) -
I'm running JSPs and servlets under Netscape (Tomcat) web server and am getting errors with my jsp file's first line:
[%@page import="java.util.*, myclass" %]
Netscape server throws an error saying that it can't import myclass. I've put the myclass.class file in various locations in the server but it still can't find it. Does anyone know a foolproof way to make the server find such a class when it's compiling jsp's?
Thanks,
DavidI think you have to specify package name of your class & not your calss name.
-
How can i load A gui JTable bean through jsp:useBean tag in a jsp page
Hi,
i am chiranjit , i am in a jsp project . i am desparately looking a solution for below stated problem:
i want to make a jsp page for master entry , that why i want to load a GUI Java bean in my jsp page.This GUI Bean contaning a JTable in which allow grid type data entry in the jsp page. But i am unable load that bean in the jsp page through jsp:useBean tag in my page.So if you have any solution then send in the forum as early as possible.
Thank you
chiranjitNo can do. JSPs can only output plain HTML (and javascript...) They are not used like normal Java classes.
If you need a complex GUI then you might use an Applet instead. If you want to use a JSP then you are stuck using normal HTML components, like <table> <form...> <input type="text"> etc... -
Hi,
i've got a problem with importing java classes into my jsp file. i use the following method:
<%@ page import="Person" %>
Person is originally a selfwritten class which lies in the subdirectory WEB-INF/classes of my webapps directory of my tomcat server. when i use the above method i get the following error output:
org.apache.jasper.JasperException: Unable to compile class for JSP An error occurred at line: 125 in the jsp file: /ShowPersonsView.jsp Generated servlet error:
[javac] Compiling 1 source file 3 3 /usr/local/tomcat/work/Standalone/localhost/address/ShowPersonsView_jsp.java:7: '.' expected
import Person;
^
/usr/local/tomcat/work/Standalone/localhost/address/ShowPersonsView_jsp.java:231: cannot resolve symbol
symbol : class Person
location: class org.apache.jsp.ShowPersonsView_jsp
Person tempperson;
^ An error occurred at line: 125 in the jsp file: /ShowPersonsView.jsp Generated servlet error:
/usr/local/tomcat/work/Standalone/localhost/address/ShowPersonsView_jsp.java:238: cannot resolve symbol
symbol : class Person
location: class org.apache.jsp.ShowPersonsView_jsp
tempperson = (Person)it.next();
^
3 errors at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:120)
at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:293)
at org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:313)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:324)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:474)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:184)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:289)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:432)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:356)
at ShowPersonsPrepare.doGet(ShowPersonsPrepare.java:51)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:260)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2396)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:405)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:380)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:508)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:533)
at java.lang.Thread.run(Thread.java:536)
Thus, the Person class can not be found but i dunno why. Where do I have to make an entry? I already tried to set a classpath to this file, but it doesn't work. Has anyone an idea?
ThanxPut the class in a package and call it accordingly. Example:
WEB-INF
|
--- classes
|
--- example
|
--- Person.java
//then in Person add:
package example;
//and in jsp
<%@ page import="example.Person" %> -
Jsp:useBean and assigning a value to that bean
Hello,
I have a type called Country and I have declared a bean using the "jsp:useBean" syntax.
I then try to assign a value to that bean in a scriptlet. Eventually I try to retrieve the values using "jsp:getProperty". The problem is that it appears to null.
Here is the code of the jsp
<%@ page language="java" %>
<%@ page import="com.parispano.latinamericaguide.*" %>
<%
/* We retrieve the Countries object from the servlet context. */
ServletContext sc = getServletContext();
Countries cs = (Countries)sc.getAttribute("countries");
%>
<jsp:useBean id="country" class="com.parispano.latinamericaguide.Country"/>
<%
/* If the request contains a country id, then we set the variable. */
country = cs.getCountryFromId(Integer.parseInt(request.getParameter("countryID")));
%>
<html>
<head>
<title>Country details</title>
</head>
<body>
<table>
<tr><td>Name</td><td><jsp:getProperty name="country" property="name"/><!-- This is not working--></td></tr>
<table>
<%
out.println(country.getName());//This is working
%>
</body>
</html>This is the code for the bean
package com.parispano.latinamericaguide;
* @author Julien Martin
* Represents a country.
public class Country implements Comparable {
private int id;
private String name;
private int landArea;
private String capital;
private String currency;
private String flag;
private String internet_domain;
private String dialling_code;
private float literacy;
private float male_life_expectancy;
private float female_life_expectancy;
private String map;
private int population;
private int population_year;
private float birth_rate;
private int birth_rate_year;
private float death_rate;
private int death_rate_year;
private int gdp;
private int gdp_per_head;
private int gdp_year;
private float unemployment_rate;
private int unemployment_rate_year;
public Country() {
public Country(
int id,
String name,
int landArea,
String capital,
String currency,
String flag,
String internet_domain,
String dialling_code,
float literacy,
float male_life_expectancy,
float female_life_expectancy,
String map,
int population,
int population_year,
float birth_rate,
int birth_rate_year,
float death_rate,
int death_year_rate,
int gdp,
int gdp_year,
float unemployment_rate,
int unemployment_rate_year) {
this.id = id;
this.name = name;
this.landArea = landArea;
this.capital = capital;
this.currency = currency;
this.flag = flag;
this.internet_domain = internet_domain;
this.dialling_code = dialling_code;
this.literacy = literacy;
this.male_life_expectancy = male_life_expectancy;
this.female_life_expectancy = female_life_expectancy;
this.map = map;
this.population = population;
this.population_year = population_year;
this.birth_rate = birth_rate;
this.birth_rate_year = birth_rate_year;
this.death_rate = death_rate;
this.death_rate_year = death_year_rate;
this.gdp = gdp;
this.gdp_year = gdp_year;
this.unemployment_rate = unemployment_rate;
this.unemployment_rate_year = unemployment_rate_year;
public float getBirth_rate() {
return birth_rate;
public int getBirth_rate_year() {
return birth_rate_year;
public String getCapital() {
return capital;
public String getCurrency() {
return currency;
public float getDeath_rate() {
return death_rate;
public int getDeath_rate_year() {
return death_rate_year;
public String getDialling_code() {
return dialling_code;
public float getFemale_life_expectancy() {
return female_life_expectancy;
public String getFlag() {
return flag;
public int getGdp() {
return gdp;
public int getGdp_per_head() {
return gdp / population;
public int getGdp_year() {
return gdp_year;
public int getId() {
return id;
public String getInternet_domain() {
return internet_domain;
public float getLiteracy() {
return literacy;
public float getMale_life_expectancy() {
return male_life_expectancy;
public String getMap() {
return map;
public String getName() {
return name;
public int getPopulation() {
return population;
public int getPopulation_year() {
return population_year;
public int getLandArea() {
return landArea;
public float getUnemployment_rate() {
return unemployment_rate;
public int getUnemployment_rate_year() {
return unemployment_rate_year;
public void setBirth_rate(float f) {
birth_rate = f;
public void setBirth_rate_year(int i) {
birth_rate_year = i;
public void setCapital(String string) {
capital = string;
public void setCurrency(String string) {
currency = string;
public void setDeath_rate(float f) {
death_rate = f;
public void setDeath_rate_year(int i) {
death_rate_year = i;
public void setDialling_code(String string) {
dialling_code = string;
public void setFemale_life_expectancy(float f) {
female_life_expectancy = f;
public void setFlag(String string) {
flag = string;
public void setGdp(int i) {
gdp = i;
public void setGdp_per_head(int i) {
gdp_per_head = gdp/population;
public void setGdp_year(int i) {
gdp_year = i;
public void setId(int i) {
id = i;
public void setInternet_domain(String string) {
internet_domain = string;
public void setLiteracy(float f) {
literacy = f;
public void setMale_life_expectancy(float f) {
male_life_expectancy = f;
public void setMap(String string) {
map = string;
public void setName(String string) {
name = string;
public void setPopulation(int i) {
population = i;
public void setPopulation_year(int i) {
population_year = i;
public void setlandArea(int i) {
landArea = i;
public void setUnemployement_rate(float f) {
unemployment_rate = f;
public void setUnemployment_rate_year(int i) {
unemployment_rate_year = i;
public String toString() {
return name;
public int compareTo(Object o) {
Country c = (Country)o;
int cmp = name.compareTo(c.name);
System.out.println(cmp);
return cmp;
}Can anyone please help?
Thanks in advance,
Julien.Thanks,
I have added scope="application". It still show "null" indicating that the bean is not initialized with the properties. I would like a quicker way to initialize a bean property than invoking the setProperty tag for each property.
Here is a simple example that demonstrates the problem:
<%@ page language="java" %>
<%@ page import="com.tests.*" %>
<jsp:useBean id="monBean" class="com.tests.MonBean" scope="application"/>
<%
MonBean mb = new MonBean();
mb.setName("toto");
monBean= mb;
%>
<html>
<head>
<title>Lomboz JSP</title>
</head>
<body bgcolor="#FFFFFF">
<jsp:getProperty name="monBean" property="name"/>
</body>
</html>And the bean
package com.tests;
public class MonBean {
private String name;
public String getName() {
return name;
public void setName(String name) {
this.name = name;
}This show "null".
Any other idea why this is not working?
Thanks,
Julien -
Hi All,
I am going over both the J2EE tutorial and JSP1.2 spec.
As far as I read, it seems to me that "jsp:useBean" is a way of creating a bean object.
<jsp:useBean id="local" scope="application" class="Mylocales">
If I put the class file in the import statement, can I create the object in the scriptlet
<% Mylocales local = new Mylocales(); %>
and set/get properties by calling
local.setName(); // assume these methods are in the class
local.getName();
without using "jsp:setProperty" and "jsp:getProperty".In this way, isn't it a redundancy to have "jsp:useBean" in JSP spec? We can always create any kind of objects in the scriptlets.
Since "jsp:useBean" has been there for years, I believe something must be wrong with my rationale. However, both the spec and the tutorial couldn't answer this question. Can anyone clear it up to me?
Thx in advance.
KevinThere's nothing wrong with your rationale; useBean IS a redundant tag, but it does provide some compact functionality without having to write extra code.
http://java.sun.com/products/jsp/tags/11/syntaxref1115.html covers the syntax of this tag; one advantage of using this tag is the 'scope' attribute, that allows you to define, at object creation, just how long the object will be around. You can limit an object's scope to the page that declared it, or allow it to be accessed by any page that shares the same session, or request, or application.
I do believe that the main point of this tag comes in at the design level; one of the strongest reasons to use JSPs at all is to separate out the application logic from the page presentation. This means that anyone who can use HTML should be able to maintain the JSP pages in the application. Instead of having to teach a non-programmer a little bit of code, just demonstrate the use of a single tag that can be reused throughout the application. The logical extension of this idea is the tag library.
Myself, I mix and match as needed, but there are never more than a few lines of scriptlet code in my JSP pages. If there's more code than HTML in my JSP page, I'll go ahead and use a servlet instead.
Anyway, I guess my point is that JSP pages are flexible, you can pick the functionality that you want to use, and the useBean tag isn't quite superfluous. -
%@ page import="..." % does not seem to be working correctly
Hi,
I am running Weblogic 6.1 sp1 and I am having a problem with import page
directive. <%@ page import="my.package.*" %> does not appear to be working
correctly when I try to reference classes in imported packages (my.package,
etc.) from the useBean tag.
The following code works with Resin, but not Weblogic:
<%@ page import="my.package.*" %>
<jsp:useBean id="errorBean" class="ErrorBean" scope="request"/>
If, I take out the page directive, and change the useBean tag to:
<jsp:useBean id="errorBean" class="my.package.ErrorBean"
scope="request"/>
then the page compiles and runs just fine.
Michael
Here's a snippet from Sun's j2ee tutorial
(http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/JSPBeans4.html):
<jsp:useBean id="beanName"
class="fully_qualified_classname" scope="scope"/>
But I agree with you, the excerpt you posted seems to include the
useBean tag, which is misleading.
Nils
Michael Hill wrote:
>
> I don't think this is the way it is "supposed" to be. Here is an excerpt
> from the JSP Syntax reference on http://developer.java.sun.com
> on the page directive:
>
> import= "{ package.class | package.* }, ..."
> A comma-separated list of one or more packages that the JSP file should
> import. The packages (and their classes) are available to scriptlets,
> expressions, declarations, and tags within the JSP file. You must place the
> import attribute before the tag that calls the imported class. If you want
> to import more than one package, you can specify a comma-separated list
> after import or you can use import more than once in a JSP file.
>
> ---
>
> It says the packages are available to tags within the JSP file as long as
> you place the import before the tag that calls the imported class. In my
> case, I am placing the import before the <jsp:useBean> tag.
>
> Michael
>
> "Nils Winkler" <[email protected]> wrote in message
> news:[email protected]...
> > I'm pretty sure that you have to specify the fully qualified class name
> > in the useBean tag. import won't help you here.
> >
> > Nils
> >
> > Michael Hill wrote:
> > >
> > > Hi,
> > >
> > > I am running Weblogic 6.1 sp1 and I am having a problem with import page
> > > directive. <%@ page import="my.package.*" %> does not appear to be
> working
> > > correctly when I try to reference classes in imported packages
> (my.package,
> > > etc.) from the useBean tag.
> > >
> > > The following code works with Resin, but not Weblogic:
> > >
> > > <%@ page import="my.package.*" %>
> > > <jsp:useBean id="errorBean" class="ErrorBean" scope="request"/>
> > >
> > > If, I take out the page directive, and change the useBean tag to:
> > >
> > > <jsp:useBean id="errorBean" class="my.package.ErrorBean"
> > > scope="request"/>
> > >
> > > then the page compiles and runs just fine.
> > >
> > > Michael
> >
> > --
> > ============================
> > [email protected]
============================
[email protected]
-
Jsp:useBean gives cannot be resolved to a type in Tomcat
Hi, I am using Tomcat 5.5
I have a simple JavaBean for test purposes :
import java.io.Serializable;
public class testBean implements Serializable {
int number;
public testBean() {
public int getNumber() {
return number;
public void setNumber(int newValue) {
number = newValue;
}In a file called testBean.java
I have successfuly compiled it and put the class file the WEB-INF/classes directory.
I have the following JSP page :
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<jsp:useBean id="pub" scope="session" class="testBean" />
<jsp:setProperty name="pub" property="number" value="1" />
<html>
<head>
</head>
<body>
<jsp:getProperty name="pub" property="number" />
</body>
</html>When I open this jsp page I get the following error:
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 2 in the jsp file: /test.jsp
Generated servlet error:
testBean cannot be resolved to a typeThis example is pretty minimal and I don't understand why it doesn't work. The error seems to be coming from the first JSP statement.
Any help would be greatly appreciated.
Thanks in advance.1. Put your bean class in a package.
package test;
import...........2. Put the .class file in web-inf/classes/test/testBean.class
3. Specify the fully qualified name of the class in the useBean declaration.
<jsp:useBean class="test.testBean" .../>Note: You'd be better off following the java bean naming conventions. Specifically your class name should be TestBean (first letter caps).
ram. -
jsp:useBean error== The value for useBean class is invalid
Can anybody tell me why am i getting the error for the JavaBean.
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: /SimpleBean.jsp(9,0) The value for the useBean class attribute com.stardeveloper.bean.test.SimpleBean is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1272)
org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1178)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2361)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2411)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2417)
org.apache.jasper.compiler.Node$Root.accept(Node.java:495)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2361)
org.apache.jasper.compiler.Generator.generate(Generator.java:3426)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:216)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:332)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:312)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:299)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:586)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.20 logs.
Apache Tomcat/6.0.20
my jsp file is in path c:\tomcat6\webapps\dev\SimpleBean.jsp
my JavaBean compiled class is in path
c:\tomcat6\webapps\dev\WEB-INF\classes\com\stardeveloper\bean\test\SimpleBean.class
and my SimpleBean java class declaration is
package com.stardeveloper.bean.test;
public class SimpleBean implements java.io.Serializable
and my jsp page SimpleBean.jsp pages call to useBean is as follows
<jsp:useBean id="simple" class="com.stardeveloper.bean.test.SimpleBean">
<jsp:setProperty name="simple" property="name" value="Sujoy" />
<jsp:setProperty name="simple" property="age" value="26" />
</jsp:useBean>
Please help me anybody.First, try restarting Tomcat :-)
Main 3 reasons for "useBean class is invalid"
- class must be in a package (ok)
- class must be public, and have public constructor that takes no arguments (check)
- class must be compiled, valid and on the classpath. Normally this means the WEB-INF/classes directory.
From what you have told us, everything seems to check out.
Try recompiling the .class file to ensure it is valid.
Does your constructor do anything which might thrown an exception?
Can you invoke it in scriptlet code without getting an exception?
<%@ page import="com.stardeveloper.bean.test.SimpleBean" %>
<% SimpleBean sb = new SimpleBean() %>Trying it in scriptlet code like this might give you a different error message that might help your diagnosis.
cheers,
evnafets -
Jsp:useBean and definition of bean inside jsp:declaration
I use the following code where I define a bean in jsp:declaration
Its name is localBean. the problem is that jsp:useBean causes
a crash and my page is not working without understanding why.
When I replace the localBean in the jsp:useBean with another Bean
which is an actual class that resides in the system I have not a problem.
Any suggestions???
<HTML>
<jsp:declaration>
static public class localBean {
private String value;
public String getValue() {
return value;
public void setValue(String value) {
this.value = value;
</jsp:declaration>
<jsp:useBean id="localBean" scope="page" class="localBean">
<jsp:setProperty name="localBean" property="value" value="World"/>
</jsp:useBean>
<%-- Whatever HTTP parameters we have, try to set
an analogous bean property -- %>
<jsp:setProperty name="localBean" property="*"/>
<head>
<title>Hello World JavaBean</title>
</head>
<body>
<center>
<p><h1>
Hello
<jsp:getProperty name="localBean" property="value"/>
</h1></p>
<form method="post">
Enter a name to be greeted:
<input type="text" size="32" name="value"
value="<jsp:getProperty name='localBean' property='value'/>">
<br>
<input type="submit" value="submit"/>
</form>
</center>
</body>
</html>Thanks,
I have added scope="application". It still show "null" indicating that the bean is not initialized with the properties. I would like a quicker way to initialize a bean property than invoking the setProperty tag for each property.
Here is a simple example that demonstrates the problem:
<%@ page language="java" %>
<%@ page import="com.tests.*" %>
<jsp:useBean id="monBean" class="com.tests.MonBean" scope="application"/>
<%
MonBean mb = new MonBean();
mb.setName("toto");
monBean= mb;
%>
<html>
<head>
<title>Lomboz JSP</title>
</head>
<body bgcolor="#FFFFFF">
<jsp:getProperty name="monBean" property="name"/>
</body>
</html>And the bean
package com.tests;
public class MonBean {
private String name;
public String getName() {
return name;
public void setName(String name) {
this.name = name;
}This show "null".
Any other idea why this is not working?
Thanks,
Julien
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