java.lang.UnsupportedClassVersionError: nextapp/echo2/webcontainer/WebContainerServlet (Unsupported major.minor version 49.0)

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java.lang.UnsupportedClassVersionError: nextapp/echo2/webcontainer/WebContainerServlet (Unsupported major.minor version 49.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)

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