在LINUX下安装好ORACLE后不能以DBA身份登录iSQL*Plus

在LINUX下安装好ORACLE后不能以DBA身份登录iSQL*Plus,请问是什么原因?
要以DBA身份登陆isqlplus，必须先配置好oc4j用户。 使用基于xml配置文件（jazn-data.xml）身份认证方式,需要进入JAZN命令环境.执行以下命令java-Djava.security.properties=$ORACLE_HOME/sqlplus/admin/iplus/provider-jar $ORACLE_HOME/oc4j/j2ee/home/jazn.jar -user "iSQL*Plus DBA/admin"-password welcome -shell
无法进入JAZN环境.执行结果如下:
[oracle@localhostisqlplus]$ java-Djava.security.properties=$ORACLE_HOME/sqlplus/admin/iplus/provider-jar $ORACLE_HOME/oc4j/j2ee/home/jazn.jar -user "iSQL*Plus DBA/admin"-password welcome -shell
Warning: -jar not understood. Ignoring.
Exception in thread "main" java.lang.NoClassDefFoundError: .u01.app.oracle.10.2.0.db_1.oc4j.j2ee.home.jazn.jar
at gnu.gcj.runtime.FirstThread.run() (/usr/lib/libgcj.so.5.0.0)
at _Jv_ThreadRun(java.lang.Thread) (/usr/lib/libgcj.so.5.0.0)
at _Jv_RunMain(java.lang.Class, byte const, int, byte const, boolean) (/usr/lib/libgcj.so.5.0.0)
at __gcj_personality_v0(/u01/app/oracle/10.2.0/db_1/oc4j/j2ee/isqlplus/application-deployments/isqlplus/java.version=1.4.2)
at __libc_start_main (/lib/tls/libc-2.3.4.so)
at _Jv_RegisterClasses(/u01/app/oracle/10.2.0/db_1/oc4j/j2ee/isqlplus/application-deployments/isqlplus/java.version=1.4.2)