先前系统上有JDK 6的安装，由于要部署Facebook的Presto做一些测试，需要将其升级到JDK 7，但是在安装的过程中遇到以下的问题：
[root@x01 data2]# rpm -ivh --force --replacepkgs jdk-7u45-linux-x64.rpm
Preparing... ########################################### [100%]
1:jdk ########################################### [100%]
Unpacking JAR files...
rt.jar...
Error: Could not open input file: /usr/java/jdk1.7.0_45/jre/lib/rt.pack
Error: unpack could not create JAR file:
/usr/java/jdk1.7.0_45/jre/lib/rt.jar
Please refer to the Troubleshooting section of the Installation Instructions
on the download page.
jsse.jar...
Error: Could not open input file: /usr/java/jdk1.7.0_45/jre/lib/jsse.pack
Error: unpack could not create JAR file:
/usr/java/jdk1.7.0_45/jre/lib/jsse.jar
Please refer to the Troubleshooting section of the Installation Instructions
on the download page.
charsets.jar...
Error: Could not open input file: /usr/java/jdk1.7.0_45/jre/lib/charsets.pack
Error: unpack could not create JAR file:
/usr/java/jdk1.7.0_45/jre/lib/charsets.jar
Please refer to the Troubleshooting section of the Installation Instructions
on the download page.
tools.jar...
Error: Could not open input file: /usr/java/jdk1.7.0_45/lib/tools.pack
Error: unpack could not create JAR file:
/usr/java/jdk1.7.0_45/lib/tools.jar
Please refer to the Troubleshooting section of the Installation Instructions
on the download page.
localedata.jar...
Error: Could not open input file: /usr/java/jdk1.7.0_45/jre/lib/ext/localedata.pack
Error: unpack could not create JAR file:
/usr/java/jdk1.7.0_45/jre/lib/ext/localedata.jar
Please refer to the Troubleshooting section of the Installation Instructions
on the download page.
jfxrt.jar...
Error: Could not open input file: /usr/java/jdk1.7.0_45/jre/lib/jfxrt.pack
Error: unpack could not create JAR file:
/usr/java/jdk1.7.0_45/jre/lib/jfxrt.jar
Please refer to the Troubleshooting section of the Installation Instructions
on the download page.
如果在这种情况下，我们查看Java的版本，会报出以下的错误：
[root@x01 data2]# java -version Error occurred during initialization of VM java/lang/NoClassDefFoundError: java/lang/Object
最终的解决办法，是清理掉系统残留的旧版本的相关的安装：
[root@x01 data2]# rpm -qa | grep jdk jdk-1.7.0_45-fcs.x86_64 [root@x01 data2]# rpm -e jdk-1.7.0_45-fcs.x86_64 [root@x01 data2]# rpm -qa | grep jdk [root@x01 data2]# rpm -qa | grep java sun-javadb-core-10.6.2-1.1.i386 sun-javadb-javadoc-10.6.2-1.1.i386 sun-javadb-common-10.6.2-1.1.i386 sun-javadb-client-10.6.2-1.1.i386 sun-javadb-docs-10.6.2-1.1.i386 sun-javadb-demo-10.6.2-1.1.i386 [root@x01 data2]# rpm -e sun-javadb-* error: package sun-javadb-* is not installed [root@x01 data2]# rpm -e sun-javadb-core-10.6.2-1.1.i386 sun-javadb-javadoc-10.6.2-1.1.i386 sun-javadb-common-10.6.2-1.1.i386 sun-javadb-client-10.6.2-1.1.i386 sun-javadb-docs-10.6.2-1.1.i386 sun-javadb-demo-10.6.2-1.1.i386 [root@x01 data2]# rpm -qa | grep java [root@x01 data2]# rpm -qa | grep jre [root@x01 data2]# rpm -qa | grep java [root@x01 data2]# rpm -qa | grep jdk
这样之后，再运行先前的安装程序即可：
[root@x01 data2]# rpm -ivh jdk-7u45-linux-x64.rpm
Preparing... ########################################### [100%]
1:jdk ########################################### [100%]
Unpacking JAR files...
rt.jar...
jsse.jar...
charsets.jar...
tools.jar...
localedata.jar...
jfxrt.jar...
[root@x01 data2]# source /etc/profile
[root@x01 data2]# java -version
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)
[root@x01 data2]#
Done!