java.lang.NUllPointerException

[Deepa Amasar，修改在11 年前。]

Hiii
im getting the following error while installing the liferay..


Exception in thread "main" java.lang.NoClassDefFoundError: com/liferay/portal/kernel/util/ReleaseInfo
at com.liferay.ide.eclipse.server.core.support.ReleaseInfoGetServerInfo.writeOutput(ReleaseInfoGetServerInfo.java:29)
at com.liferay.ide.eclipse.server.core.support.PortalSupport.main(PortalSupport.java:52)
Caused by: java.lang.ClassNotFoundException: com.liferay.portal.kernel.util.ReleaseInfo
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)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 2 more

[David H Nebinger，修改在11 年前。]

Probably because you haven't installed it correctly.

Do yourself a favor and start with a Liferay bundle. It is pre-configured to get you up and running...

[Hemant Gupta，修改在10 年前。]

Done many times but don't what is problem with java.lang.nullpointerException.