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Http Status 500 Error In Eclipse

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Http Status 500 - Java.lang.nullpointerexception In Jsp

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How To Solve Http Status 500 Error In Tomcat

you, helping each other. Join them; it only takes a minute: Sign up Calling servlet from tomcat throws HTTP Status 500 java.lang.NullPointerException up vote 0 down vote favorite 1 I am new to J2EE and build a sample project using tomcat and eclipse. While the index.html load properly but when i submit the page (or make call to servlet), i received below exception HTTP Status 500 - type Exception report message description The server encountered an internal error that prevented it from fulfilling this request. exception java.lang.NullPointerException java.util.concurrent.ConcurrentHashMap.putVal(Unknown Source) java.util.concurrent.ConcurrentHashMap.putIfAbsent(Unknown Source) java.lang.ClassLoader.getClassLoadingLock(Unknown Source) java.lang.ClassLoader.loadClass(Unknown Source) java.lang.ClassLoader.loadClass(Unknown Source) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1641) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:492) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421) org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070) org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611) org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314) java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) org.apach

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Http Status 500 - Error Instantiating Servlet Class In Eclipse

site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers http status 500 - java.lang.nullpointerexception in netbeans or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community http://stackoverflow.com/questions/26623311/calling-servlet-from-tomcat-throws-http-status-500-java-lang-nullpointerexceptio of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up HTTP Status 500 - Failed to load application class error in eclipse up vote 0 down vote favorite I am creating vaadin 6 application using eclipse Kepler. Tomcat Server is main page running (localhost:8080). But http://stackoverflow.com/questions/24066419/http-status-500-failed-to-load-application-class-error-in-eclipse when, I run an application, I get HTTP Status 500 - Failed to load application class error. type Exception report message Failed to load application class: com.example.secondone.SecondoneApplication description The server encountered an internal error that prevented it from fulfilling this request. exception javax.servlet.ServletException: Failed to load application class: com.example.secondone.SecondoneApplication com.vaadin.terminal.gwt.server.ApplicationServlet.init(ApplicationServlet.java:71) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023) org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:906) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:929) java.lang.Thread.run(Thread.java:761) I'm using vaadin 6.8.13 and have installed the plugins and added the jar to WEB-INF --> lib folder. I'm not able to figure out the exact cause of this error. Please help me out. eclipse tomcat vaadin share|improve this question asked Jun 5 '14 at 17:23 poovannan 114 add a comment| 2 Answers 2 active oldest votes up vote 1 down vote These types of errors are usually caused by issues in the project configuration. Make sure you haven't made any typos in your web.xml and systematically check your project structure for any mistakes. Could it be, for example,

Certification Databases Caching Books Engineering Languages Frameworks Products This Site Careers Other all forums Forum: Tomcat HTTP status 500 Abhinav Kumar Mishra Greenhorn http status Posts: 6 posted 5 years ago when i click submit button on form.html page it gives following error. HTTP Status 500 - type Exception report message description The server encountered an http status 500 internal error () that prevented it from fulfilling this request. exception javax.servlet.ServletException: Error allocating a servlet instance org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174) org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:879) org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665) org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528) org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81) org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689) java.lang.Thread.run(Unknown Source) root cause java.lang.NoClassDefFoundError: com/example/web/BeerSelect (wrong name: BeerSelect) java.lang.ClassLoader.defineClass1(Native Method) java.lang.ClassLoader.defineClass(Unknown Source) java.security.SecureClassLoader.defineClass(Unknown Source) org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1960) org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:933) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1405) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1284) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174) org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:879) org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665) org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528) org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81) org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689) java.lang.Thread.run(Unknown Source) note The full stack trace of the root cause is available in the Apache Tomcat/5.5.33 logs. Apache Tomcat/5.5.33 my form.html code is as below: BEER hello

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