[smslib] Error Unsupported major.minor version 51.0

[Ricardo Marín via SMSLib Discussion Group]

Hi, 
Please help for this error when i run my web app on Eclipse. I dont't know 
what is missing, i did step by step all smslib3.5.4  installation 
instructions.

[WARN] Nested in javax.servlet.ServletException: init:
java.lang.UnsupportedClassVersionError: 
org/smslib/IOutboundMessageNotification : Unsupported major.minor version 
51.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(Unknown Source)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.access$000(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at 
com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload$WebAppClassLoaderExtension.findClass(JettyLauncher.java:372)
    at 
org.mortbay.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:366)
    at 
org.mortbay.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:337)
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
    at java.lang.Class.getConstructor0(Unknown Source)
    at java.lang.Class.newInstance0(Unknown Source)
    at java.lang.Class.newInstance(Unknown Source)
    at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153)
    at 
org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:339)
    at 
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:463)
    at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1097)
    at 
com.queuecontroldisp.server.GWTCacheControlFilter.doFilter(GWTCacheControlFilter.java:46)
    at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1088)
    at 
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
    at 
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at 
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
    at 
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
    at 
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at 
org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)
    at 
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:324)
    at 
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
    at 
org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
    at 
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:396)
    at 
org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)

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