All about Pradeep Kumar

Getting Internal error when invoking http remoting using HttpRequestHandlerServlet

I am exposing a service using httpInvoker and is working fine when working with DispatcherServlet. When I switch from RequestDispatcher to HttpRequestHandlerServlet I am getting an error Did not receive successful HTTP response: status code = 500, status message = [Internal Server Error]. Below are the configuration files. I have already spend 2 days debugging and have no clue. Please let me know where I am going wrong. The code is checked in Git repo. Link is - https://github.com/prashdeep/spring-remoting.git

Inside my web.xml file:

Inside my client-config.xml file:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<bean id="calculationBean" class="com.remoting.http.CalculationImpl"></bean>
<bean id="transferService"
class="org.springframework.remoting.httpinvoker.HttpInvokerProxyFactoryBean">
<property name="serviceUrl" value="http://localhost:8080/spring-remoting/transferservice"></property>
<property name="serviceInterface" value="com.remoting.http.Calculation"></property>
</bean>
<bean name="servletname"
class="org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter">
<property name="service" ref="calculationBean"></property>
<property name="serviceInterface" value="com.remoting.http.Calculation"></property>
</bean>
</beans>

In the index.jsp

In the process.jsp

Finally in my ClientInvoker.java

Error log on the browser:

org.apache.jasper.JasperException: org.springframework.remoting.RemoteAccessException: Could not access HTTP invoker remote service at [http://localhost:8080/spring-remoting/transferservice]; nested exception is java.io.IOException: Did not receive successful HTTP response: status code = 500, status message = [Internal Server Error]
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:555)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
org.springframework.remoting.RemoteAccessException: Could not access HTTP invoker remote service at [http://localhost:8080/spring-remoting/transferservice]; nested exception is java.io.IOException: Did not receive successful HTTP response: status code = 500, status message = [Internal Server Error]
org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.convertHttpInvokerAccessException(HttpInvokerClientInterceptor.java:216)
org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.invoke(HttpInvokerClientInterceptor.java:147)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
com.sun.proxy.$Proxy4.add(Unknown Source)
com.remoting.http.ClientInvoker.sum(ClientInvoker.java:18)
org.apache.jsp.process_jsp._jspService(process_jsp.java:119)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.io.IOException: Did not receive successful HTTP response: status code = 500, status message = [Internal Server Error]
org.springframework.remoting.httpinvoker.SimpleHttpInvokerRequestExecutor.validateResponse(SimpleHttpInvokerRequestExecutor.java:185)
org.springframework.remoting.httpinvoker.SimpleHttpInvokerRequestExecutor.doExecuteRequest(SimpleHttpInvokerRequestExecutor.java:92)
org.springframework.remoting.httpinvoker.AbstractHttpInvokerRequestExecutor.executeRequest(AbstractHttpInvokerRequestExecutor.java:138)
org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.executeRequest(HttpInvokerClientInterceptor.java:194)
org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.executeRequest(HttpInvokerClientInterceptor.java:176)
org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.invoke(HttpInvokerClientInterceptor.java:144)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
com.sun.proxy.$Proxy4.add(Unknown Source)
com.remoting.http.ClientInvoker.sum(ClientInvoker.java:18)
org.apache.jsp.process_jsp._jspService(process_jsp.java:119)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

8 years ago

Spring

Junit testing with dependencies

Jeanne Boyarsky wrote:Pradeep,
You are going to need to refactor that code to make it testable. Ideas:

3) Make the private method default access or protected and override it to do nothing.

#3 is often a hack, but it is easiest to do. Especially if you can't change the code much.

I like the idea of the 3rd option. How do i override the method and test the method. Do you mean extends the class and override the method and test the sub class?

12 years ago

Testing

Junit testing with dependencies

Hi friends,
I am a beginner in Junit testing and just started exploring Junit for writing the test cases. I have a scenario where I am struck and finding it difficult to proceed. The scenario is that I am testing a public method which internally calls private methods. In on of the private method, the method tries to connect to the environment and the properties of the environment is fetched in the private method. How can i override the behavior such that I can override the behavior by populating the properties and mimic the environment dependency even though I do not directly call the private method.

Ex:

In the main class:

In the ConfigDetail class

Please let me know to do proceed.
Thanks and Regards,
Pradeep

12 years ago

Testing

Shell script -Automating Maven Builds- Conditional execution if connected to specified network

Hi Duran,
I would love to hear the motive behind writing the scripts to build and deploy using a shell script when you can use a continuos integration tools like hudson/Jenkins . Its so easy for building and managing the complete project build and deployment infrastructure.

http://www.unixonthego.com

12 years ago

GNU/Linux

remote login issue

My two cents on this. How is that you can login to ServerB from ServerA and not from your local windows machine.

To verify if the ServerB is accessible from your local windows machine try pinging the serverB from the cmd window. If you cannot ping then the serverB is not in the same network or domain.
To verify that the ports are open form your local windows machine try doing telnet to serverB from putty to port 22 which is the default port for ssh login. If you are not able to telnet to ServerB you cannot login to the remote machine.

Also are ServerA and your machine on the same domain? In case they are not in same domain, you need to use SSL VPN to connect to the ServerB from your local machine.

In case they are in the same domain, you need to see if there is any proxy required to login to ServerB from your local machine. Check with your system administrator for more details.

Hope this helps.

Http://www.unixonthego.com

12 years ago

GNU/Linux

query about histoy command

Yes. The history of commands executed for the users will be stored in the .bash_history file inside the home directory. Also the number of commands to be stored in history can be configured using the H!ISTSIZE property. Some additional useful commands can be found on http://www.unixonthego.com/history-command-with-unix/ website.

12 years ago

GNU/Linux

Need help to Copy a File from Unix to Windows

To transfer files between Unix and Windows you can install WinSCP tool which is a free tool. Once installed the files can be copied from and to Unix and Windows machine.

Regards,
Pradeep
http://www.unixonthego.com

12 years ago

GNU/Linux

how to invoke perl script on unix server from local machine

To execute the pel script from the Java code you can use the ProceeBuilder API from Java. I would prefer ProcessBuilder over System.exec since the former gives you a handle to the inputStream as well as the outputStream. Here is the sample code.

Hope this helps

Regards,
Pradeep

http://www.unixonthego.com

12 years ago

GNU/Linux

book for UNIX

I would suggest you "Unix Power Tools" book. Very comprehensive and informative.

Regards,
Pradeep
http://www.unixonthego.com

12 years ago

GNU/Linux

Java Threads for cuncurrency

Anayonkar Shivalkar wrote:

Pradeep Kumar wrote:My question is if it is singleton, how is it an issue?

Ok. Let's assume that class is not singleton. Now, what you are gonna do is : create different objects of that class - each object will carry configuration of one external system, and provide one object per thread. So that you'll attempt different connections at the same time.

Pradeep Kumar wrote:Also if we create threads and run on a singleton object why is is not a parallel process.

Because, all threads run under same process, so, it is multithreading, not multiprocessing.

I hope this helps.

Yes i got the difference you mentioned with the singelton that you were referring to.

What I am still not clear is if its not a singleton and we create n threads and n number of objects for n configurations, how is this better than looping in a for loop and testing each configuration at a time inside a for loop without the thread concept. What is the advantages?

Please let me know your thoughts on the same.

13 years ago

Threads and Synchronization

Java Threads for cuncurrency

Anayonkar Shivalkar wrote:
This is not parallel processing. Here, we are running threads.
I hope this helps.

The class was a singleton because it was a utility class and will be used throughout the application to connect to external system. My question is if it is singleton, how is it an issue? since we are creating threads, and threads can operate on a singleton object. a thread can notify other threads when one of the thread succeeds.

Also if we create threads and run on a singleton object why is is not a parallel process. Yes i agree, that it ups to the scheduler to pick which thread to run but we can assume that threads all threads are sharing the CPU and hence assume its running in parallele

Please comment on the same.

Regards,
Pradeep

13 years ago

Threads and Synchronization

Java Threads for cuncurrency

Hi Friends,

Its a long time since I have logged into this site.

I have a singleton object which has a method containing some parameters (external systems credentails). The singleton object tries to connect to external systems based on the arguments passed. one of them gets connected and the rest fails. Now currently I am doing it in a sequential way. i.e first try to send the details to the singleton object and see the response. If its not connected then try with different arguments until the singleton object establishes the connection for which i know the credentials. Can i do it using threads? so that i need not have to wait for n attempts before getting the right one.

If yes.Is it equivalent to have a parallel process running. Are there any risks like deadlock etc.

Regards,
Pradeep

13 years ago

Threads and Synchronization

maven goal for different modules

Hi friends,
I have a requirement to execute different goals for different project in a multi project build system. Ho can i do it? The below is what it looks like

Now i need to execute mvn packagefor project1, mvn install for project2, mvn compile for project3 and mvn deploy for project4. Also preferably, it should be externalizable.

How do i achieve this in maven? Please let me know.

13 years ago

Other Build Tools

maven unable to download artifacts

I could resolve it by temporarily uploading the artifact to the internal repository. The reason I was not able to download the artifact behind the proxy is that I was using the maven-external-dependency plugin to download from n external url and the plugin is not connection the url through the proxy setting. I guess its a bug in the plugin.

<plugin>
<groupId>com.savage7.maven.plugins</groupId>
<artifactId>maven-external-dependency-plugin</artifactId>
<version>0.4</version>
<executions>
<execution>
<phase>validate</phase>
<goals>
<goal>resolve-external</goal>
<goal>install-external</goal>
</goals>
</execution>
</executions>
<configuration>
<createChecksum>true</createChecksum>
<skipChecksumVerification>false</skipChecksumVerification>
<artifactItems>
<artifactItem>
<groupId>com.adobe.flex.framework</groupId>
<artifactId>framework</artifactId>
<version>${flex.sdk.version}</version>
<packaging>swz</packaging>
<downloadUrl>http://fpdownload.adobe.com/pub/swz/flex/${flex.sdk.version}/{artifactId}_{version}.{packaging}</downloadUrl>
</artifactItem>
<artifactItem>
<groupId>com.adobe.flex.framework</groupId>
<artifactId>textLayout</artifactId>
<version>${flex.tlf.version}</version>
<packaging>swz</packaging>
<downloadUrl>http://fpdownload.adobe.com/pub/swz/tlf/${flex.tlf.version}/{artifactId}_{version}.{packaging}</downloadUrl>
</artifactItem>
<artifactItem>
<groupId>com.adobe.flex.framework</groupId>
<artifactId>osmf</artifactId>
<version>${flex.osmf.version}</version>
<packaging>swz</packaging>
<downloadUrl>http://fpdownload.adobe.com/pub/swz/flex/${flex.sdk.version}/{artifactId}_{version}.{packaging}</downloadUrl>
</artifactItem>
. . . . .

13 years ago

Other Build Tools

Pradeep Kumar

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