JAVA_HOME=/usr/java/jdk1.5.0
CLASSPATH=./usr/java/jdk1.5.0/lib/de.jar/usr/java/j2sdk1.5.0/lib/tools.jar
export PATH=$PATH/usr/java/j2sdk1.5.0/bin
我的?铨是：
.?java ?境韵置，重新???呢後，在剿端?行java命令?，系靳提示
Error occurred during initialization of VM
java/lang/NoclassDefFoundError:java/lang/object　　　　　　

JAVA_HOME=/usr/java/jdk1.5.0
CLASSPATH=./usr/java/jdk1.5.0/lib/de.jar/usr/java/j2sdk1.5.0/lib/tools.jar
export PATH=$PATH/usr/java/j2sdk1.5.0/bin
这段东西你写哪个文件里的?　　　　　　

在"/etc/profile"彦　　　　　　

安砚 jdk1.5.0後，又安砚 jstudio8.0，呃?不知道 有?有影?java?境韵置呢？　　　　　　

export JAVA_HOME=/usr/java/jdk1.5.0
应该就可以了,不行的话再加上 export JRE_HOME=/usr/java/jdk1.5.0/jre　　　　　　

CLASSPATH=./usr/java/jdk1.5.0/lib/de.jar/usr/java/j2sdk1.5.0/lib/tools.jar
应该改成CLASSPATH=.JAVA_HOME/lib/de.jarJAVA_HOME/lib/tools.jar　　　　　　

[root@testing008 root]# java -version
libgcj-java-placeholder.sh

This script is a placeholder for the /usr/bin/java
master link required by jpackage.org conventions.  libgcj's
rmiregistry, rmic and jar tools are now slave symlinks to these
masters, and are managed by the alternatives(8) system.

This change was necessary because the rmiregistry, rmic and jar tools
installed by previous versions of libgcj conflicted with symlinks
installed by jpackage.org JVM packages.

This script was designed to be overridden by the supported RHEL3 JRE
packages, java-1.4.2-bea and java-1.4.2-ibm.  It is installed as an
alternative symlink as /usr/bin/java.  It will override a third-party
(non-RHEL3) JRE's java command if the JRE's bin directory is listed
after /usr/bin in PATH.  In that case, it is recommended that the
third-party JRE's bin directory be listed first in PATH instead.

gij (GNU libgcj) version 3.2.3 20030502 (Red Hat Linux 3.2.3-52)

Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.　　　　　　

export PATH=$PATH/usr/java/j2sdk1.5.0/bin
把/usr/java/j2sdk1.5.0/bin放到$PATH$前面　　　　　　

第一，把环境变量设置为系统变量，不要设置为用户变量。
第二，把path设置为export PATH=/usr/java/j2sdk1.5.0/bin;$PATH