java.lang.UnsupportedClassVersionError: oracle/dbtools/jarcl/Entrypoint : Unsupported major.minor version 51.0

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oracle/dbtools/jarcl/Entrypoint : Unsupported major.minor version 51.0
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java.lang.UnsupportedClassVersionError: oracle/dbtools/jarcl/Entrypoint : 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$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

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