Tomcat and Pass thru servlet

[buha]

Hi,
Firstly I would like to thank to Lun, Bill and to you too , Micheal for helping me in Tomcat and Apache configuration. And gladely, I already success in it ;). But, there is other problem, that is when I put the part in web.xml, there is an error occur. Is there any setting I should do in this part? Here I give you the part I fail…and off course to view taminoFilter I does not success…




transform
com.softwareag.tamino.passthru.TaminoFilter

contenttype
text/html


allowremote
no


trace
on


log
on


cache
on


transformer
com.softwareag.tamino.passthru.xt.TransformerFactoryImpl





parser
org.apache.xerces.jaxp.SAXParserFactoryImpl






And this is error I receive on taminoFilter
javax.servlet.ServletException: Cannot allocate servlet instance for path /examples/servlet/com.softwareag.tamino.passthru.TaminoFilter
at org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:419)
at org.apache.catalina.servlets.InvokerServlet.doGet(InvokerServlet.java:180)
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 filters.ExampleFilter.doFilter(ExampleFilter.java:149)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at filters.ExampleFilter.doFilter(ExampleFilter.java:149)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:475)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.ajp.tomcat4.Ajp13Processor.process(Ajp13Processor.java:458)
at org.apache.ajp.tomcat4.Ajp13Processor.run(Ajp13Processor.java:551)
at java.lang.Thread.run(Thread.java:484)


root cause

java.lang.NoClassDefFoundError: javax/xml/transform/TransformerException
at java.lang.Class.newInstance0(Native Method)
at java.lang.Class.newInstance(Class.java:237)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:886)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:655)
at org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:400)
at org.apache.catalina.servlets.InvokerServlet.doGet(InvokerServlet.java:180)
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 filters.ExampleFilter.doFilter(ExampleFilter.java:149)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at filters.ExampleFilter.doFilter(ExampleFilter.java:149)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:475)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.ajp.tomcat4.Ajp13Processor.process(Ajp13Processor.java:458)
at org.apache.ajp.tomcat4.Ajp13Processor.run(Ajp13Processor.java:551)
at java.lang.Thread.run(Thread.java:484)

Can you tell me how to deal with this problem?

Siti Salmah Md Kassim

[Lun]

This is just a guess, because after I configured it successfully, I have another encoding problem, so I removed it and havn’t used it.

Check to see if xercesImpl.jar, xmlParserAPIs.jar and xml-apis.jar exist in your examples/WEB-INF/lib, as the exception in your root cause show that a miss of javax/xml/transform.xxx. Those jar can be downloaded from http://xml.apache.org/xerces2-j/index.html

[buha]

Hi Micheal,
To configure this, is it I have to change the transform in web.xml? I can put any name to replace it or what?

Originally posted by Michael Kay:
I would be inclined to install the new servlet without overwriting the old one, even if it’s a test installation rather than a live one. You should be able to do this most easily by creating a new web application directory for it. You could also put it in the existing directory, since all the Java classes in the new servlet have different names from the old: all you need to do is to create new entries for the new servlet (and a new alias) in the web.xml file. Once everything is working you can change the servlet alias to the old one, so that existing applications use the new servlet.

Michael Kay

Siti Salmah Md Kassim

[Guest]

It would probably make life easier if you started a new thread when you have a new question: it’s becoming difficult to keep track of this thread.

Firstly, the stack trace shows that you haven’t got the JAXP classes on your class path. These are often bundled with XML software such as Xalan or Saxon, and in fact they are a standard part of JDK 1.4. But if you’re using xt and JDK 1.3, you’ll need to install them separately.

You can get JAXP from http://java.sun.com/xml/downloads/javaxmlpack.html

Your other question was about installing both versions of the servlet together. This is no problem. You can give the servlet any alias you like: “transform” was just an example. The important thing is to get the class name right. The new version of the passthru servlet has a different class name from the old.

Michael Kay

[buha]

Hi Mike,
Sorry because keep using the same thread. I already have JAXP. I also use xt and jdk1.3, how did you mean install them separately? is it I must have set class path for JAXP and xt at classpath?

You said that the important thing is to get the right class name, how is it? can you tell me.

Originally posted by Michael Kay:
It would probably make life easier if you started a new thread when you have a new question: it’s becoming difficult to keep track of this thread.

Firstly, the stack trace shows that you haven’t got the JAXP classes on your class path. These are often bundled with XML software such as Xalan or Saxon, and in fact they are a standard part of JDK 1.4. But if you’re using xt and JDK 1.3, you’ll need to install them separately.

You can get JAXP from http://java.sun.com/xml/downloads/javaxmlpack.html

Your other question was about installing both versions of the servlet together. This is no problem. You can give the servlet any alias you like: “transform” was just an example. The important thing is to get the class name right. The new version of the passthru servlet has a different class name from the old.

Michael Kay

Siti Salmah Md Kassim

[Guest]

Buha, the stack trace you showed in a previous message indicated that one of the JAXP classes was not present on your class path. So make sure that JAXP, or some package that contains it, is included in the lib directory of the tomcat application.

As to the class name of the servlet, a typical entry in the web.xml file is as follows:


transform
com.softwareag.tamino.passthru.TaminoFilter

contenttype
text/html


allowremote
no


trace
on


log
on


cache
on


transformer
com.softwareag.tamino.passthru.xt.TransformerFactoryImpl



parser
org.apache.xerces.jaxp.SAXParserFactoryImpl




In this entry, you can set the servlet-name to anything you like (this will be the name that appears in URLs used to invoke the servlet), but the servlet-class entry must be exactly as shown.

Michael Kay