在centOS上安装oracle出现java.lang.NoClassDefFoundError问题及解决方法

问题一：CentOS6.5 静默安装Oracle 11G过程中提示：Exception in thread "main" java.lang.NoClassDefFoundError .

在执行sh ./database/runInstaller -silent -noconfig -responseFile ./database/response/db_install.rsp时，提示：

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

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:164)

at java.awt.Toolkit$2.run(Toolkit.java:821)

at java.security.AccessController.doPrivileged(Native Method)

at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:804)

at com.jgoodies.looks.LookUtils.isLowResolution(Unknown Source)

at com.jgoodies.looks.LookUtils.<clinit>(Unknown Source)

at com.jgoodies.looks.plastic.PlasticLookAndFeel.<clinit>(PlasticLookAndFeel.java:122)

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:242)

at javax.swing.SwingUtilities.loadSystemClass(SwingUtilities.java:1783)

at javax.swing.UIManager.setLookAndFeel(UIManager.java:480)

at oracle.install.commons.util.Application.startup(Application.java:758)

at oracle.install.commons.flow.FlowApplication.startup(FlowApplication.java:164)

at oracle.install.commons.flow.FlowApplication.startup(FlowApplication.java:181)

at oracle.install.commons.base.driver.common.Installer.startup(Installer.java:265)

at oracle.install.ivw.db.driver.DBInstaller.startup(DBInstaller.java:114)

at oracle.install.ivw.db.driver.DBInstaller.main(DBInstaller.java:132)

　　1 .用root用户在系统中设置了DISPLAY环境变量

　　执行：unset DISPLAY 然后再执行runInstaller.sh，执行成功

　　2.重新启动系统。以oracle的身份登录系统，然后执行./runInstaller

问题二：在centos系统安装oracle_x64_11gR2_database版本，在执行./runInstaller命令后，抛出"No protocol specified..Exception in thread "main" java.lang.NoClassDefFoundError.."异常

　　1. 切换root账号

　　2.执行命令xhost +，如下所示

　　[root@xoms database]# xhost +

　　　　access control disabled, clients can connect from any host

问题解决！