2720024 - ACTool fails to start due to UnsupportedClassVersionError

ACtool fails to start due to the error message similar like below:

"[root@<host name> ACTOOL_2.54]# ./run_actool.sh
HOSTAGENTEXE=/usr/sap/hostctrl/exe
boe.home=/usr/sap/<the root installation path of BOE>/sap_bobj
BOEJVMBIN=usr/sap/<the root installation path of BOE>/sap_bobj/enterprise_xi40/sapjvm/bin
Using unique BOSDK lib:/usr/sap/<the root installation path of BOE>/sap_bobj/enterprise_xi40/java/lib/cesdk.jar
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/sap/ac/entry/ConsoleModeLauncher : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: com.sap.ac.entry.ConsoleModeLauncher. Program will exit. 

• BOBJ XI4.1 SP<SP09
• BOBJ XI4.0

KBA , SV-SMG-DIA , Diagnostics , Problem