We are unable to start ApacheDS 2.0.0-M20. Following is the error log: STATUS | wrapper | 2015/06/01 00:39:16 | --> Wrapper Started as Daemon STATUS | wrapper | 2015/06/01 00:39:16 | Launching a JVM... INFO | jvm 1 | 2015/06/01 00:39:16 | Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/directory/server/wrapper/ApacheDsTanukiWrapper : Unsupported major.minor version 51.0 INFO | jvm 1 | 2015/06/01 00:39:16 | at java.lang.ClassLoader.defineClass1(Native Method) INFO | jvm 1 | 2015/06/01 00:39:16 | at java.lang.ClassLoader.defineClass(ClassLoader.java:643) INFO | jvm 1 | 2015/06/01 00:39:16 | at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) INFO | jvm 1 | 2015/06/01 00:39:16 | at java.net.URLClassLoader.defineClass(URLClassLoader.java:277) INFO | jvm 1 | 2015/06/01 00:39:16 | at java.net.URLClassLoader.access$000(URLClassLoader.java:73) INFO | jvm 1 | 2015/06/01 00:39:16 | at java.net.URLClassLoader$1.run(URLClassLoader.java:212) INFO | jvm 1 | 2015/06/01 00:39:16 | at java.security.AccessController.doPrivileged(Native Method) INFO | jvm 1 | 2015/06/01 00:39:16 | at java.net.URLClassLoader.findClass(URLClassLoader.java:205) INFO | jvm 1 | 2015/06/01 00:39:16 | at java.lang.ClassLoader.loadClass(ClassLoader.java:323) INFO | jvm 1 | 2015/06/01 00:39:16 | at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294) INFO | jvm 1 | 2015/06/01 00:39:16 | at java.lang.ClassLoader.loadClass(ClassLoader.java:268) ERROR | wrapper | 2015/06/01 00:39:17 | JVM exited while loading the application. INFO | jvm 1 | 2015/06/01 00:39:17 | Could not find the main class: org.apache.directory.server.wrapper.ApacheDsTanukiWrapper. Program will exit. FATAL | wrapper | 2015/06/01 00:39:17 | There were 1 failed launches in a row, each lasting less than 300 seconds. Giving up. FATAL | wrapper | 2015/06/01 00:39:17 | There may be a configuration problem: please check the logs. STATUS | wrapper | 2015/06/01 00:39:17 | <-- Wrapper Stopped It seems it is due the JDK version. We have JDK 1.6.x. As per http://directory.apache.org/apacheds/basic-ug/1.3-installing-and-starting.html , it should work with JDK 6 as well. I request you to please confirm which JDK version we require for ApacheDS 2.0.0-M20. Thanks, Sunil.
