Why javax.servlet.http.HttpServlet is serializable ?
As per serialization definition if super class implements java.io.Serializable then all sub classes are also get that behaviour.
while coming to Servlets : javax.servlet.GenericServlet implents java.io.Serializable and this servlet class is super class for javax.servlet.http.HttpServlet and this also implemts java.io.Serializable. Is there any specific reason ?
Quoting a reply from the link below:
>
Technically, I believe the servlet container is allowed to "passivate" the servlet object to disk, in a similar way that EJB session beans can be. So you're correct to ask the question if your app will fail due to non-serializable fields.
In practise, I've never heard of a container doing this, so it's really just legacy baggage from the bad old days of early J2EE. I wouldn't worry about it.
>
[http://stackoverflow.com/questions/179743/why-does-httpservlet-implement-serializable]
Similar Messages
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Service method in javax.servlet.http.HttpServlet
Hi All,
I have a doubt in the service method of javax.servlet.http.HttpServlet
There are two service methods in the javax.servlet.http.HttpServlet.
one is with protected and other is with public access specifier.
In the javadoc it is said that public service method dispatches client requests to the protected service method.
Why this type of design is required.
Instead of having a two service methods, Is it not possible to have a single service method and attain the functionality intended.
Are there any advantages by having two service methods.
I think there may be some idea/functionality behind these for having two service methods , which I am not able to understand.
Would be greatful , if someone can throw light on this .
Thanks,
Dhanasekaran.This is just a theory, but here goes:
The public service() method takes arguments of ServletRequest and ServletResponse, presumably because that's the signature that the non-HTTP specific servlet engine requires.
The protected service() method of HttpServlet takes arguments of HttpServletRequest and HttpServletResponse and includes HTTP specific functions.
My guess is that the public service() method either casts the arguments to the Http objects or does work to create the Http objects before calling the protected method. -
How solve import javax.servlet.http.HttpServlet err import javax.servlet.
Hi
I am trying to compile one servlet code using commancd prompt and i get
package javax.servlet.http does not exist import javax.servlet.http.HttpServlet;
error for following code
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
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please help meTry giving servlet..jar path in the class path variable
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Tomcat 5 can�t find javax.servlet.http.HttpServlet
Hi.
I don�t know if this is a simple question or not, but i didn�t find anything solving this problem and
i�m new to tomcat......
I�m trying to deploy my web application in my system. (Windows XP , j2sdk1.4.2_02, jakarta Tomcat 5, jakarta struts 1.1 and jakarta taglibs 1.1).No problems while compiling the .java classes and checked all the .jar files that my application needs to work (or that is what I think). I expand my .war file at /webapps on tomcat directory and startup Tomcat. Tomcat starts up but while starting I get the following errors...
17-feb-2004 17:58:50 org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on port 8080
17-feb-2004 17:58:51 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 4948 ms
17-feb-2004 17:58:51 org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
17-feb-2004 17:58:51 org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/5.0.18
17-feb-2004 17:58:51 org.apache.catalina.core.StandardHost start
INFO: XML validation disabled
17-feb-2004 17:58:51 org.apache.catalina.core.StandardHost getDeployer
INFO: Create Host deployer for direct deployment ( non-jmx )
17-feb-2004 17:58:51 org.apache.catalina.core.StandardHostDeployer install
INFO: Processing Context configuration file URL file:C:\softProyecto\Tomcat5\conf\Catalina\localhost\admin.xml
17-feb-2004 17:58:55 org.apache.commons.digester.Digester endElement
GRAVE: End event threw exception
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.commons.beanutils.MethodUtils.invokeMethod(MethodUtils.java:252)
at org.apache.commons.digester.SetNextRule.end(SetNextRule.java:256)
at org.apache.commons.digester.Rule.end(Rule.java:276)
at org.apache.commons.digester.Digester.endElement(Digester.java:1058)
at org.apache.catalina.util.CatalinaDigester.endElement(CatalinaDigester.java:123)
at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.commons.digester.Digester.parse(Digester.java:1567)
at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDeployer.java:520)
at org.apache.catalina.core.StandardHost.install(StandardHost.java:906)
at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:527)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:472)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1008)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:394)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:166)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1133)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:832)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1125)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:518)
at org.apache.catalina.core.StandardService.start(StandardService.java:519)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:2345)
at org.apache.catalina.startup.Catalina.start(Catalina.java:598)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:297)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:398)
Caused by: java.lang.NoClassDefFoundError: javax/servlet/http/HttpServlet
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
it seems like C:\softProyecto\Tomcat5\conf\Catalina\localhost\admin.xml (C:\softproyecto\tomcat5 = tomcat�s home directory) needs javax.servlet.http.HttpServlet. And that comes from a Tomcat .jar file, i think.
After more and more messages..... here it comes my application (MapasRuido)...which needs javax.servlet.http.HttpServlet and compiled ok at compiling time!
INFO: Installing web application at context path /MapasRuido from URL file:C:\softProyecto\Tomcat5\webapps\MapasRuido
17-feb-2004 18:02:48 org.apache.catalina.startup.HostConfig deployDirectories
GRAVE: Error durante el despliegue del directorio MapasRuido de la aplicaci�n web
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at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at java.lang.ClassLoader.loadClass(ClassLoader.java:282)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1296)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1230)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1677)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:900)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1350)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1230)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1677)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:900)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1350)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1230)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:979)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:887)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3960)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4283)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:866)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:850)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:638)
at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDeployer.java:320)
at org.apache.catalina.core.StandardHost.install(StandardHost.java:875)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:727)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:477)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1008)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:394)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:166)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1133)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:832)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1125)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:518)
at org.apache.catalina.core.StandardService.start(StandardService.java:519)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:2345)
at org.apache.catalina.startup.Catalina.start(Catalina.java:598)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:297)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:398)
17-feb-2004 18:02:48 org.apache.catalina.core.StandardHostDeployer install
INFO: Installing web application at context path from URL file:C:\softProyecto\Tomcat5\webapps\ROOT
17-feb-2004 18:02:48 org.apache.catalina.core.StandardHostDeployer install
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17-feb-2004 18:02:49 org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on port 8080
tomcat�s web applications servlets-examples and tomcat-docs work fine, but my application doesn�t. Is there any relation between those errors? any idea about what happens?
Thank you in advance."...The CLASSPATH is ignored by Tomcat, of course. AND javac. AND java. AND Eclipse. AND NetBeans. AND JBuilder. And just about everything else in the Java universe..."
What I mean by this, of course, is that each of these requires you to set the CLASSPATH in the way they expect. None of them even looks for a system environment variable named CLASSPATH. You can waste a lot of time thinking that your CLASSPATH is "all set", but it's not.
Tomcat assumes the following for your Web app's CLASSPATH:
(0) The JDK rt.jar, of course,
(1) All the JARs in TOMCAT_HOME/common/lib,
(2) All the JARs in your WEB-INF/lib,
(3) All the .class files in your WEB-INF/classes
That's it. (Maybe one or two others, but those are the important ones.)
Eclipse and NetBeans have their own way to set CLASSPATH for each project. You'll have to learn how for those IDEs.
The CLASSPATH is still vitally important. The system environment variable just isn't part of it. - MOD -
Javax.servlet.http.HttpServlet
I'm in netbeans and I've created a new 'General Java Application' - I'm trying to import the package above but the netbeans can't find it.
I'm guessing this is because the J2EE packages aren't included in a General Java Application - can somebody explain to me how this works? and how I can get this package imported into my project? thanks.Herko_ter_Horst wrote:
The Java Standard Edition API will be available by default.
Servlets are part of the Enterprise Edition, as you rightly assumed.
Netbeans most likely has the ability to create a "Web Application Project" or some such. I expect such a project to include the Servlet API.this is helpful, thanks. and it's also helpful that Netbeans can provide the EE API in the case where I choose to create a web app. But what if I wasn't using an IDE and I wanted to be able to access the EE API - is there an easy way to include all the necessary libraries? is there an index somewhere that associates SE/EE/ME classes with their containing .jar files? -
ClassCastException: javax.servlet.http.NoBodyResponse
Hi all,
I Have an EAR containing a web application containing a bunch of servlets and an applet accessed through jnlp. When I start the applet, everything works perfectly well, all the functionnalities work. But in my log file, I get about 4 exceptions (always the same) and sometime later on (using the applet) I get one or two more. I know some people on the net had the same problem in various situations but I never found replies to their posts in the archives.
So it runs on sun JSAS 9.0, Windows XP64.
This is the exceptionx I get in the server log just when webstart starts:
(sorry, it is long and ugly in this small text box).
--> The "com.zerobase..." line is just because I override service() and call super() there.
java.lang.ClassCastException: javax.servlet.http.NoBodyResponse
at org.apache.catalina.core.ApplicationDispatcherForward.getStatus(ApplicationDispatcherForward.java:335)
at org.apache.catalina.core.ApplicationDispatcherForward.commit(ApplicationDispatcherForward.java:79)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:355)
at com.zerobase.chaplin.action.PostActionServlet.processActionForward(PostActionServlet.java:692)
at com.zerobase.chaplin.action.PostActionServlet.process(PostActionServlet.java:336)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:492)
at javax.servlet.http.HttpServlet.doHead(HttpServlet.java:281)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:724)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at com.zerobase.chaplin.action.PostActionServlet.service(PostActionServlet.java:114)
at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:397)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:278)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:179)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:73)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:182)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
at com.sun.enterprise.web.VirtualServerPipeline.invoke(VirtualServerPipeline.java:120)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:137)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:239)
at com.sun.enterprise.web.connector.grizzly.ProcessorTask.invokeAdapter(ProcessorTask.java:667)
at com.sun.enterprise.web.connector.grizzly.ProcessorTask.processNonBlocked(ProcessorTask.java:574)
at com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:844)
at com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:287)
at com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:212)
at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:252)
at com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:75)Thanks for reporting this issue!
I've filed a GlassFish issue at
https://glassfish.dev.java.net/issues/show_bug.cgi?id=2210
Please add yourself to the issue's "cc" list, so you'll get notified of any progress.
Jan -
ClassCastException: javax.servlet.http.NoBodyOutputStream
Can anyone tell me what is going on with the following ? Runing WL 6.1 SP2.
We are getting a fair number of these.
####<Mar 27, 2003 6:04:50 PM CST> <Error> <HTTP> <vusdfwdevbld2>
<VSWA420B91Server> <ExecuteThread: '66' for queue: 'default'> <admin> <>
<101020> <[WebAppServletContext(1229058,vissys-web,/vissys-web)] Servlet
failed with Exception>
java.lang.ClassCastException: javax.servlet.http.NoBodyOutputStream
at
weblogic.servlet.ClasspathServlet.sendResource(ClasspathServlet.java:229)
at weblogic.servlet.ClasspathServlet.doGet(ClasspathServlet.java:94)
at javax.servlet.http.HttpServlet.doHead(HttpServlet.java:313)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:757)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:265)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:200)
at
weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletCo
ntext.java:2495)
at
weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java
:2204)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
Can anyone tell me what is going on with the following ? Runing WL 6.1 SP2.
We are getting a fair number of these.
####<Mar 27, 2003 6:04:50 PM CST> <Error> <HTTP> <vusdfwdevbld2>
<VSWA420B91Server> <ExecuteThread: '66' for queue: 'default'> <admin> <>
<101020> <[WebAppServletContext(1229058,vissys-web,/vissys-web)] Servlet
failed with Exception>
java.lang.ClassCastException: javax.servlet.http.NoBodyOutputStream
at
weblogic.servlet.ClasspathServlet.sendResource(ClasspathServlet.java:229)
at weblogic.servlet.ClasspathServlet.doGet(ClasspathServlet.java:94)
at javax.servlet.http.HttpServlet.doHead(HttpServlet.java:313)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:757)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:265)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:200)
at
weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletCo
ntext.java:2495)
at
weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java
:2204)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
-
When running weblogic 4.5.1 on our staging server we get the following
exceptions happening intermitently
Our other servers have identical code and properties files and they are fine
Tue Jul 11 12:03:53 GMT+01:00 2000:<E> <ServletContext-Servlets> Servlet
failed with RuntimeException
Tue Jul 11 12:03:53 GMT+01:00 2000:<E> <ServletContext-Servlets>
java.lang.ClassCastException: javax.servlet.http.NoBodyOutputStream
at weblogic.servlet.FileServlet.sendFile(Compiled Code)
at weblogic.servlet.FileServlet.doGet(Compiled Code)
at javax.servlet.http.HttpServlet.doHead(Compiled Code)
at javax.servlet.http.HttpServlet.service(Compiled Code)
at javax.servlet.http.HttpServlet.service(Compiled Code)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(Compiled Code)
at weblogic.servlet.internal.ServletContextImpl.invokeServlet(Compiled
Code)
at weblogic.servlet.internal.ServletContextImpl.invokeServlet(Compiled
Code)
at weblogic.socket.MuxableSocketHTTP.invokeServlet(Compiled Code)
at weblogic.socket.MuxableSocketHTTP.execute(Compiled Code)
at weblogic.t3.srvr.ExecuteThread.run(Compiled Code)
Tue Jul 11 12:03:53 GMT+01:00 2000:<E> <HTTP> Servlet request terminated
with IOException:
Tue Jul 11 12:03:53 GMT+01:00 2000:<E> <HTTP> java.net.ProtocolException:
Exceeded stated content-length of: 1230 bytes
at java.lang.Throwable.fillInStackTrace(Native Method)
at java.lang.Throwable.fillInStackTrace(Compiled Code)
at java.lang.Throwable.<init>(Compiled Code)
at java.lang.Exception.<init>(Compiled Code)
at java.io.IOException.<init>(Compiled Code)
at java.net.ProtocolException.<init>(Compiled Code)
at weblogic.servlet.internal.ServletOutputStreamImpl.print(Compiled Code)
at javax.servlet.ServletOutputStream.println(ServletOutputStream.java:252)
at
weblogic.servlet.internal.ServletResponseImpl.sendError(ServletResponseImpl.
java:307)
at weblogic.servlet.internal.ServletResponseImpl.sendError(Compiled Code)
at weblogic.servlet.internal.ServletContextImpl.invokeServlet(Compiled
Code)
at weblogic.servlet.internal.ServletContextImpl.invokeServlet(Compiled
Code)
at weblogic.socket.MuxableSocketHTTP.invokeServlet(Compiled Code)
at weblogic.socket.MuxableSocketHTTP.execute(Compiled Code)
at weblogic.t3.srvr.ExecuteThread.run(Compiled Code)
Any ideas ?When running weblogic 4.5.1 on our staging server we get the following
exceptions happening intermitently
Our other servers have identical code and properties files and they are fine
Tue Jul 11 12:03:53 GMT+01:00 2000:<E> <ServletContext-Servlets> Servlet
failed with RuntimeException
Tue Jul 11 12:03:53 GMT+01:00 2000:<E> <ServletContext-Servlets>
java.lang.ClassCastException: javax.servlet.http.NoBodyOutputStream
at weblogic.servlet.FileServlet.sendFile(Compiled Code)
at weblogic.servlet.FileServlet.doGet(Compiled Code)
at javax.servlet.http.HttpServlet.doHead(Compiled Code)
at javax.servlet.http.HttpServlet.service(Compiled Code)
at javax.servlet.http.HttpServlet.service(Compiled Code)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(Compiled Code)
at weblogic.servlet.internal.ServletContextImpl.invokeServlet(Compiled
Code)
at weblogic.servlet.internal.ServletContextImpl.invokeServlet(Compiled
Code)
at weblogic.socket.MuxableSocketHTTP.invokeServlet(Compiled Code)
at weblogic.socket.MuxableSocketHTTP.execute(Compiled Code)
at weblogic.t3.srvr.ExecuteThread.run(Compiled Code)
Tue Jul 11 12:03:53 GMT+01:00 2000:<E> <HTTP> Servlet request terminated
with IOException:
Tue Jul 11 12:03:53 GMT+01:00 2000:<E> <HTTP> java.net.ProtocolException:
Exceeded stated content-length of: 1230 bytes
at java.lang.Throwable.fillInStackTrace(Native Method)
at java.lang.Throwable.fillInStackTrace(Compiled Code)
at java.lang.Throwable.<init>(Compiled Code)
at java.lang.Exception.<init>(Compiled Code)
at java.io.IOException.<init>(Compiled Code)
at java.net.ProtocolException.<init>(Compiled Code)
at weblogic.servlet.internal.ServletOutputStreamImpl.print(Compiled Code)
at javax.servlet.ServletOutputStream.println(ServletOutputStream.java:252)
at
weblogic.servlet.internal.ServletResponseImpl.sendError(ServletResponseImpl.
java:307)
at weblogic.servlet.internal.ServletResponseImpl.sendError(Compiled Code)
at weblogic.servlet.internal.ServletContextImpl.invokeServlet(Compiled
Code)
at weblogic.servlet.internal.ServletContextImpl.invokeServlet(Compiled
Code)
at weblogic.socket.MuxableSocketHTTP.invokeServlet(Compiled Code)
at weblogic.socket.MuxableSocketHTTP.execute(Compiled Code)
at weblogic.t3.srvr.ExecuteThread.run(Compiled Code)
Any ideas ? -
Why I got package javax.servlet.http do not exist
I have package javax.servlet.http do not exist problem, can anyone tell me why?
Thank youHi all
Thank you for all kinds of replies. It is Windows problems. but I got a new questions here
1) it seems I don't need to including
install_dir\common\lib\jsp-api.jar in classpath!!
2) when I try servletUtilities,
from http://www.coreservlets.com/Apache-Tomcat-Tutorial/#Configure-Tomcat
I got error
HelloServlet3.java:23: cannot resolve symbol
symbol : variable ServletUtilities
location: class coreservlets.HelloServlet3
out.println(ServletUtilities.headWithTitle(title) +
^
1 error
both my HelloServlet3 and servletUtilities under
WEB-INF\classes\coreservlets
thank you -
Package javax.servlet.http does not exist
Hello All,
A few problems here
1. My classpath doesnt seem to work.:
.;"C:\Program Files\Apache Software Foundation\Tomcat 6.0\lib\servlet-api.jar"
2. As a result, i get many errors in my simple code, but there are still a few that are not related to javac not recognizing the servlet api.
I also tried setting the classpath at the command line (event hough its temporary)
set classpath="C:\Program Files\Apache Software Foundation\Tomcat 6.0\lib\servlet-api.jar"
but the servlet package is still not recognized
I have 2 classes, one to read the database connection details from a file and another class, my servlet.
Servlet Code:
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class CustomQuery extends HttpServlet
public void init() throws ServletException
EstablishDBConnetion.establishConnection();
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
response.setContentType("text/html");
PrintWriter printer = new response.getWriter();
String title = "Result from custom query";
Statement stmt = EstablishDBConnetion.establishConnection.con.createStatement();
ResultSet rs = stmt.executeQuery("select customerID from customer");
while(rs.next())
printer.println("<html> <head><title>" + title + "</title><br><br><table border=\"0\"> <tr><td>" + rs.getString(1));
rs.close();
stmt.close();
EstablishDBConnetion.establishConnection.con.close();
Database connection code
import java.io.*;
import java.sql.*;
import java.util.StringTokenizer;
class EstablishDBConnetion
public static void establishConnection()
try
String dbDriver = "";
String dbUrl = "";
String dbName = "";
String dbUser = "";
String dbPassword = "";
String newLine = "";
BufferedReader fileRead = new BufferedReader(new FileReader("connection.txt"));
boolean readerStatus = fileRead.ready();
newLine = fileRead.readLine();
while (readerStatus)
StringTokenizer st = new StringTokenizer(newLine, ",");
while (st.hasMoreTokens())
dbDriver = st.nextToken();
dbUrl = st.nextToken();
dbName = st.nextToken();
dbUser = st.nextToken();
dbPassword = st.nextToken();
readerStatus = fileRead.ready();
Class.forName(dbDriver);
String url = dbUrl + dbName;
System.out.print(url);
Connection con = DriverManager.getConnection(url, dbUser, dbPassword);
catch (IOException e)
System.out.println("IO exception in establishConnection()");
e.printStackTrace();
catch (java.lang.Exception ex)
System.out.println("General exception in establishConnection()");
ex.printStackTrace();
public static void main(String[] args)
//EstablishDBConnetion edbc = new EstablishDBConnetion();
establishConnection();
}also, full error list below
CustomQuery.java:4: package javax.servlet does not exist
import javax.servlet.*;
^
CustomQuery.java:5: package javax.servlet.http does not exist
import javax.servlet.http.*;
^
CustomQuery.java:7: cannot find symbol
symbol: class HttpServlet
public class CustomQuery extends HttpServlet
^
CustomQuery.java:10: cannot find symbol
symbol : class ServletException
location: class CustomQuery
public void init() throws ServletException
^
CustomQuery.java:16: cannot find symbol
symbol : class HttpServletRequest
location: class CustomQuery
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
^
CustomQuery.java:16: cannot find symbol
symbol : class HttpServletResponse
location: class CustomQuery
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
^
CustomQuery.java:16: cannot find symbol
symbol : class ServletException
location: class CustomQuery
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
^
CustomQuery.java:19: package response does not exist
PrintWriter printer = new response.getWriter();
^
CustomQuery.java:24: cannot find symbol
symbol : variable establishConnection
location: class EstablishDBConnetion
Statement stmt = EstablishDBConnetion.establishConnection.con.createStatement();
^
CustomQuery.java:39: cannot find symbol
symbol : variable establishConnection
location: class EstablishDBConnetion
EstablishDBConnetion.establishConnection.con.close();
^
10 errors
I appreciate your help
Message was edited by:
paulchwd
null
Message was edited by:
paulchwdThe library is in tomcat/common/lib, not in tomcat/lib.
-
Error: package javax.servlet.http does not exist
Hi all,
How do I import javax.servlet?
package com.example.web;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class BeerSelect extends HttpServlet {
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
response.setContentType("text/html");
PrintWriter out = response.getWrite();
out.println ("Beer Selection Advide<br>");
String c = request.getParameter("color");
out.println ("<br>Got beer color " + c);
}What does this error mean? The error message:
Compiling 1 source file to C:\Program Files\Apache Software Foundation\MyProjects\J2EE\build\classes
C:\Program Files\Apache Software Foundation\MyProjects\J2EE\src\com\example\web\BeerSelect.java:3:
package javax.servlet does not exist
import javax.servlet.*;
C:\Program Files\Apache Software Foundation\MyProjects\J2EE\src\com\example\web\BeerSelect.java:4:
package javax.servlet.http does not exist
import javax.servlet.http.*;
C:\Program Files\Apache Software Foundation\MyProjects\J2EE\src\com\example\web\BeerSelect.java:7:
cannot find symbol
symbol: class HttpServlet
public class BeerSelect extends HttpServlet {
C:\Program Files\Apache Software Foundation\MyProjects\J2EE\src\com\example\web\BeerSelect.java:8:
cannot find symbol
symbol : class HttpServletRequest
location: class com.example.web.BeerSelect
public void doPost(HttpServletRequest request,
C:\Program Files\Apache Software Foundation\MyProjects\J2EE\src\com\example\web\BeerSelect.java:9:
cannot find symbol
symbol : class HttpServletResponse
location: class com.example.web.BeerSelect
HttpServletResponse response)
C:\Program Files\Apache Software Foundation\MyProjects\J2EE\src\com\example\web\BeerSelect.java:10:
cannot find symbol
symbol : class ServletException
location: class com.example.web.BeerSelect
throws IOException, ServletException {
6 errors
BUILD FAILED (total time: 0 seconds)Thank you.Hi,
The file servlet-api.jar / servlet.jar is not available in your classpath.
To compile an Servlet you need the jar file to be in classpath.
The jar file can be found in your webserver / application server lib folder.
Regards,
Zack -
Problems Compiling javax.servlet and javax.servlet.http
When I try to compile a program that imports both javax.servlet and javax.servlet.http, the compiler keeps telling me that "package javax.servlet does not exist"... I have place the javax.servlet packages in the src.zip and in the src folder but i dont understand why the compiler isnt picking them up. Maybe I did something wrong ... could someone help please
Try to compile vith the option "-classpath /your/path/to/servlet.jar"
-
Javax.servlet.*, javax.servlet.http are mot getting resolved in eclipse 3.2
Can any one tell why after importing javax.servlet.* and javax.servlet.http is not getting resolved in eclipse 3.2 IDE.
right click on the project in the navigator window and select properties.
you will get property window and then select library tab and click the add library button to add the jar file in which javax.serv... packages are defined. -
Package javax.servlet.http does not exist & package javax.servlet does not
Hello!
I am trying to compile this file:
/* serv2.java 29 Sep 04 */
import java.util.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class serv2 extends HttpServlet
protected void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
res.setContentType("text/html");
PrintWriter out = res.getWriter();
out.println("<HTML><HEAD><TITLE>Sample Servlet</TITLE></HEAD>"+'\n'+
"<BODY BGCOLOR='lightgreen'>"+'\n'+
"<H1 ALIGN=CENTER>Heading</H1>" + '\n' +
"<P><H2 ALIGN=CENTER>Message</H2");
out.println("</BODY></HTML>");
}And I am getting this error message:
C:\Program Files\Apache Tomcat 4.0\webapps\ROOT\WEB-INF\classes\serv2.java:4: package javax.servlet does not exist
import javax.servlet.*;
^
C:\Program Files\Apache Tomcat 4.0\webapps\ROOT\WEB-INF\classes\serv2.java:5: package javax.servlet.http does not exist
import javax.servlet.http.*;
^
C:\Program Files\Apache Tomcat 4.0\webapps\ROOT\WEB-INF\classes\serv2.java:7: cannot resolve symbol
symbol : class HttpServlet
location: class serv2
public class serv2 extends HttpServlet
^
C:\Program Files\Apache Tomcat 4.0\webapps\ROOT\WEB-INF\classes\serv2.java:9: cannot resolve symbol
symbol : class HttpServletRequest
location: class serv2
protected void doPost(HttpServletRequest req, HttpServletResponse res)
^
C:\Program Files\Apache Tomcat 4.0\webapps\ROOT\WEB-INF\classes\serv2.java:9: cannot resolve symbol
symbol : class HttpServletResponse
location: class serv2
protected void doPost(HttpServletRequest req, HttpServletResponse res)
^
C:\Program Files\Apache Tomcat 4.0\webapps\ROOT\WEB-INF\classes\serv2.java:10: cannot resolve symbol
symbol : class ServletException
location: class serv2
throws ServletException, IOException
^
6 errors
Tool completed with exit code 1
I have tried setting CLASSPATH lib/servlet.jar but it still will not work.
Please help me!!!Please check this page,
http://java.sun.com/j2se/1.4.2/docs/tooldocs/windows/classpath.html
and also
serv2 -> set it to Serv2
another nice to read :-)
http://java.sun.com/docs/codeconv/html/CodeConventions.doc8.html
+"Class names should be nouns, in mixed case with the first letter of each internal word capitalized"+
Another thing,
Put your class in a package, thanks =)
regards and goodluck,
jie -
Javax.servlet.http.* package does not exist ?
i am using j2sdk which does not include servlets, so in the forums i found that including servlet.jar file in jdk1.6.0\jre\lib\ext javax.servlet.* was included but javax.servlet.http did not ..... now this is strange either both do not work or both work. here is the code
import javax.servlet.*;
import javax.servlet.Http.*;
class login
error is package javax.servlet.Http.*; does not exist.Dear,
javax.servlet is one of the J2EE (Java Enterprise Edition) packages that is not included in the J2SE (Java Standard Edition) , so that one used for developing server side application.
I hope this help.
Regards.
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