jsf 2 - error when following tutorial of deploying jsf2.1 application on google app engine -


i followed tutorial create application jsf , deploy on google app engine if followed steps of tuto

i encountoured error : 

    18 avr. 2013 01:01:10 com.google.apphosting.utils.config.appenginewebxmlreader readappenginewebxml info: processed c:\users\user\desktop\eclispe_workspace\test_google\war\web-inf/appengine-web.xml 18 avr. 2013 01:01:10 com.google.apphosting.utils.config.abstractconfigxmlreader readconfigxml info: processed c:\users\user\desktop\eclispe_workspace\test_google\war\web-inf/web.xml 18 avr. 2013 01:01:10 com.google.appengine.tools.development.systempropertiesmanager setsystemproperties info: overwriting system property key 'java.util.logging.config.file', value 'c:\users\user\downloads\compressed\eclipse-jee-juno-sr2-win32\eclipse\plugins\com.google.appengine.eclipse.sdkbundle_1.7.7.1\appengine-java-sdk-1.7.7.1\config\sdk\logging.properties' value 'web-inf/logging.properties' 'c:\users\user\desktop\eclispe_workspace\test_google\war\web-inf\appengine-web.xml' 18 avr. 2013 01:01:10 com.google.apphosting.utils.jetty.jettylogger info info: logging jettylogger(null) via com.google.apphosting.utils.jetty.jettylogger 18 avr. 2013 01:01:11 com.google.apphosting.utils.jetty.jettylogger info info: jetty-6.1.x 18 avr. 2013 01:01:11 com.google.apphosting.utils.jetty.jettylogger warn attention: failed com.google.appengine.tools.development.devappenginewebappcontext@14ab51b{/,c:\users\user\desktop\eclispe_workspace\test_google\war}: java.lang.unsupportedclassversionerror: com/sun/faces/config/webconfiguration : unsupported major.minor version 51.0 18 avr. 2013 01:01:11 com.google.apphosting.utils.jetty.jettylogger warn attention: failed jettycontainerservice$apiproxyhandler@e8606c: java.lang.unsupportedclassversionerror: com/sun/faces/config/webconfiguration : unsupported major.minor version 51.0 18 avr. 2013 01:01:11 com.google.apphosting.utils.jetty.jettylogger warn attention: error starting handlers java.lang.unsupportedclassversionerror: com/sun/faces/config/webconfiguration : unsupported major.minor version 51.0     @ java.lang.classloader.defineclass1(native method)     @ java.lang.classloader.defineclasscond(classloader.java:631)     @ java.lang.

do have idea

thank you

java.lang.unsupportedclassversionerror happens because of higher jdk during compile time , lower jdk during runtime. couldn't deploy java code jvm bytecode target = 1.7, please try target = 1.6


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