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I was trying to install liquibase on my CentOS 6.9 it needs java (i have openjdk version "1.8.0_121") but i got this error:

  [root@sampleliquibase-3.6.2-bin..z]# ll

  total 11412

  drwxrwxrwx. 2 db2inst1 db2iadm1    4096 Dec 17 13:10 lib

 -rwxrwxrwx. 1 db2inst1 db2iadm1   11358 Jul  3 23:27 LICENSE.txt

 -rwxrwxrwx. 1 db2inst1 db2iadm1    1251 Jul  3 23:27 liquibase

 -rwxrwxrwx. 1 db2inst1 db2iadm1 9406606 Dec 17 09:42 liquibase-3.6.2- 

  bin.zip

 -rwxrwxrwx. 1 db2inst1 db2iadm1     884 Jul  3 23:27 liquibase.bat

 -rwxrwxrwx. 1 db2inst1 db2iadm1 2167086 Jul  3 23:30 liquibase.jar

 -rwxrwxrwx. 1 db2inst1 db2iadm1    7174 Jul  3 23:27 liquibase.spec

 -rwxrwxrwx. 1 db2inst1 db2iadm1    3046 Jul  3 23:27 README.txt

 drwxrwxrwx. 6 db2inst1 db2iadm1    4096 Dec 17 13:10 sdk

 -rwxrwxrwx. 1 root     root       41203 Mar 16  2017 slf4j-api-1.7.25.jar

 [root@sampleliquibase-3.6.2-bin..z]# java -jar liquibase.jar

 Error: A JNI error has occurred, please check your installation and try 

 again

 Exception in thread "main" java.lang.NoClassDefFoundError: 

 ch/qos/logback/core/filter/Filter

    at java.lang.Class.getDeclaredMethods0(Native Method)

    at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)

    at java.lang.Class.privateGetMethodRecursive(Class.java:3048)

    at java.lang.Class.getMethod0(Class.java:3018)

    at java.lang.Class.getMethod(Class.java:1784)

    at 

    sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)

    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)

    Caused by: java.lang.ClassNotFoundException: 

    ch.qos.logback.core.filter.Filter

    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)

    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)

    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

    ... 7 more

    [root@sampleliquibase-3.6.2-bin..z]#

I think some kind of class is missing but i dont know which one is and how i can add it to java classes. what should I do?

ch/qos/logback/core/filter/Filter

aka

ch.qos.logback.core.filter.Filter

is missing which is part of Logback, you can add it to the application using your buildscript. Or manually install it to your lib folder from https://mvnrepository.com/artifact/ch.qos.logback/logback-core

Maybe you are launching the wrong file. Instead of running the jar directly you might have to run the "launcher" script instead.