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I am beginner of JAVA and JSP. I am doing semester project on appengine. I have deployed project and there are no compilation or other errors. But when I open my application link it gives an error which is Error: Server Error The server encountered an error and could not complete your request. If the problem persists, please report your problem and mention this error message and the query that caused it. In my application logs I have seen three types of problems which are /favicon.ico 404 9ms 0kb 182.177.75.115 - - [19/Dec/2011:05:29:57 -0800] "GET /favicon.ico HTTP/1.1" 404 0 - - "cloudisapp.appspot.com" ms=9 cpu_ms=0 api_cpu_ms=0 cpm_usd=0.000033 No handlers matched this URL. Uncaught exception from servlet java.lang.UnsupportedClassVersionError: com/google/mystorage/server/GreetingServiceImpl : Unsupported major.minor version 51.0 java.lang.UnsupportedClassVersionError: com/google/mystorage/server/GreetingServiceImpl : Unsupported major.minor version 51.0 This request caused a new process to be started for your application, and thus caused your application code to be loaded for the first time. This request may thus take longer and use more CPU than a typical request for your application. JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

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The error under 2. means that you are compiling classes under certain JDK version and then trying to run them under the older version of JDK/JRE. Since AppEngine supports java 5 and 6, I'm guessing that you use Java 7 (OpenJDK)? Btw, error under 1. is not serious: you are just missing a favicon. See this: http://www.w3.org/2005/10/howto-favicon

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